Merge master into staging-next

22 files changed, 563 insertions, 481 deletions

diff --git a/pkgs/development/compilers/llvm/git/clang/default.nix b/pkgs/development/compilers/llvm/git/clang/default.nix
index 3873bda2b6d..9544494b356 100644
--- a/pkgs/development/compilers/llvm/git/clang/default.nix
+++ b/pkgs/development/compilers/llvm/git/clang/default.nix
@@ -1,16 +1,23 @@
-{ lib, stdenv, llvm_meta, src, substituteAll, cmake, libxml2, libllvm, version, python3
+{ lib, stdenv, llvm_meta
+, monorepoSrc, runCommand
+, substituteAll, cmake, libxml2, libllvm, version, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
 
 let
-  self = stdenv.mkDerivation ({
+  self = stdenv.mkDerivation (rec {
     pname = "clang";
     inherit version;
 
-    inherit src;
-    sourceRoot = "source/clang";
+    src = runCommand "${pname}-src-${version}" {} ''
+      mkdir -p "$out"
+      cp -r ${monorepoSrc}/cmake "$out"
+      cp -r ${monorepoSrc}/${pname} "$out"
+    '';
+
+    sourceRoot = "${src.name}/${pname}";
 
     nativeBuildInputs = [ cmake python3 ]
       ++ lib.optional enableManpages python3.pkgs.sphinx
diff --git a/pkgs/development/compilers/llvm/git/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/clang/gnu-install-dirs.patch
index b834d386b4e..a8825f08850 100644
--- a/pkgs/development/compilers/llvm/git/clang/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/clang/gnu-install-dirs.patch
@@ -1,9 +1,9 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 9e74014134a0..976e6a1757fd 100644
+index 7ea37850ad60..ac0f2d4f60b4 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
 @@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.13.4)
- if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
    project(Clang)
  
 +  include(GNUInstallDirs)
@@ -11,7 +11,7 @@ index 9e74014134a0..976e6a1757fd 100644
    set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to conform to")
    set(CMAKE_CXX_STANDARD_REQUIRED YES)
    set(CMAKE_CXX_EXTENSIONS NO)
-@@ -416,7 +418,7 @@ include_directories(BEFORE
+@@ -424,7 +426,7 @@ include_directories(BEFORE
  
  if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
    install(DIRECTORY include/clang include/clang-c
@@ -20,7 +20,7 @@ index 9e74014134a0..976e6a1757fd 100644
      COMPONENT clang-headers
      FILES_MATCHING
      PATTERN "*.def"
-@@ -425,7 +427,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+@@ -433,7 +435,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
      )
  
    install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
@@ -29,7 +29,7 @@ index 9e74014134a0..976e6a1757fd 100644
      COMPONENT clang-headers
      FILES_MATCHING
      PATTERN "CMakeFiles" EXCLUDE
-@@ -445,7 +447,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+@@ -453,7 +455,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
  
    add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
    install(PROGRAMS utils/bash-autocomplete.sh
@@ -39,10 +39,10 @@ index 9e74014134a0..976e6a1757fd 100644
    if(NOT LLVM_ENABLE_IDE)
      add_llvm_install_targets(install-bash-autocomplete
 diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
-index 704278a0e93b..d25c8d325c71 100644
+index 5752f4277444..5bf08dbf5e83 100644
 --- a/cmake/modules/AddClang.cmake
 +++ b/cmake/modules/AddClang.cmake
-@@ -123,9 +123,9 @@ macro(add_clang_library name)
+@@ -118,9 +118,9 @@ macro(add_clang_library name)
          install(TARGETS ${lib}
            COMPONENT ${lib}
            ${export_to_clangtargets}
@@ -55,8 +55,8 @@ index 704278a0e93b..d25c8d325c71 100644
  
          if (NOT LLVM_ENABLE_IDE)
            add_llvm_install_targets(install-${lib}
-@@ -170,7 +170,7 @@ macro(add_clang_tool name)
- 
+@@ -159,7 +159,7 @@ macro(add_clang_tool name)
+     get_target_export_arg(${name} Clang export_to_clangtargets)
      install(TARGETS ${name}
        ${export_to_clangtargets}
 -      RUNTIME DESTINATION bin
@@ -64,7 +64,7 @@ index 704278a0e93b..d25c8d325c71 100644
        COMPONENT ${name})
  
      if(NOT LLVM_ENABLE_IDE)
-@@ -185,7 +185,7 @@ endmacro()
+@@ -174,7 +174,7 @@ endmacro()
  macro(add_clang_symlink name dest)
    add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
    # Always generate install targets
@@ -74,10 +74,10 @@ index 704278a0e93b..d25c8d325c71 100644
  
  function(clang_target_link_libraries target type)
 diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
-index b2c0ce8dd4a0..19e5443d8c25 100644
+index 078988980c52..14b58614b40a 100644
 --- a/lib/Headers/CMakeLists.txt
 +++ b/lib/Headers/CMakeLists.txt
-@@ -215,7 +215,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+@@ -234,7 +234,7 @@ set_target_properties(clang-resource-headers PROPERTIES
    FOLDER "Misc"
    RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
  
@@ -87,10 +87,10 @@ index b2c0ce8dd4a0..19e5443d8c25 100644
  install(
    FILES ${files} ${generated_files}
 diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
-index ceef4b08637c..8efad5520ca4 100644
+index 99c6081db2d6..0887102febb3 100644
 --- a/tools/c-index-test/CMakeLists.txt
 +++ b/tools/c-index-test/CMakeLists.txt
-@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+@@ -49,7 +49,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
      set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
         "@executable_path/../../lib")
    else()
@@ -146,10 +146,10 @@ index cda8e29ec5b1..0134d8ccd70b 100644
 +  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
    COMPONENT clang-rename)
 diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
-index 51ff2e7e1565..1ed5f8a079a1 100644
+index bf88dca0a34b..7a10181e7738 100644
 --- a/tools/libclang/CMakeLists.txt
 +++ b/tools/libclang/CMakeLists.txt
-@@ -166,7 +166,7 @@ endif()
+@@ -186,7 +186,7 @@ endif()
  if(INTERNAL_INSTALL_PREFIX)
    set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
  else()
@@ -158,7 +158,7 @@ index 51ff2e7e1565..1ed5f8a079a1 100644
  endif()
  
  install(DIRECTORY ../../include/clang-c
-@@ -196,7 +196,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+@@ -216,7 +216,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
            COMPONENT
              libclang-python-bindings
            DESTINATION
@@ -168,7 +168,7 @@ index 51ff2e7e1565..1ed5f8a079a1 100644
  if(NOT LLVM_ENABLE_IDE)
    add_custom_target(libclang-python-bindings)
 diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
-index ec0702d76f18..d25d982f51da 100644
+index 74334e53c9b1..ebaae33e4324 100644
 --- a/tools/scan-build/CMakeLists.txt
 +++ b/tools/scan-build/CMakeLists.txt
 @@ -47,7 +47,7 @@ if(CLANG_INSTALL_SCANBUILD)
@@ -199,10 +199,10 @@ index ec0702d76f18..d25d982f51da 100644
    endforeach()
  
 diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
-index dd3d33439299..fea19c12ce70 100644
+index eccc6b83195b..ff72d9cf0666 100644
 --- a/tools/scan-view/CMakeLists.txt
 +++ b/tools/scan-view/CMakeLists.txt
-@@ -19,7 +19,7 @@ if(CLANG_INSTALL_SCANVIEW)
+@@ -20,7 +20,7 @@ if(CLANG_INSTALL_SCANVIEW)
                         DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
      list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
      install(PROGRAMS bin/${BinFile}
@@ -211,7 +211,7 @@ index dd3d33439299..fea19c12ce70 100644
              COMPONENT scan-view)
    endforeach()
  
-@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+@@ -34,7 +34,7 @@ if(CLANG_INSTALL_SCANVIEW)
                         DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
      list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
      install(FILES share/${ShareFile}
diff --git a/pkgs/development/compilers/llvm/git/compiler-rt/default.nix b/pkgs/development/compilers/llvm/git/compiler-rt/default.nix
index 019148039d1..59ca5348fed 100644
--- a/pkgs/development/compilers/llvm/git/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/git/compiler-rt/default.nix
@@ -1,4 +1,7 @@
-{ lib, stdenv, llvm_meta, version, src, cmake, python3, libllvm, libcxxabi }:
+{ lib, stdenv, llvm_meta, version
+, monorepoSrc, runCommand
+, cmake, python3, libllvm, libcxxabi
+}:
 
 let
 
@@ -7,14 +10,21 @@ let
   haveLibc = stdenv.cc.libc != null;
   inherit (stdenv.hostPlatform) isMusl;
 
+  baseName = "compiler-rt";
+
+  src = runCommand "${baseName}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${baseName} "$out"
+  '';
 in
 
 stdenv.mkDerivation {
-  pname = "compiler-rt" + lib.optionalString (haveLibc) "-libc";
+  pname = baseName + lib.optionalString (haveLibc) "-libc";
   inherit version;
 
   inherit src;
-  sourceRoot = "source/compiler-rt";
+  sourceRoot = "${src.name}/${baseName}";
 
   nativeBuildInputs = [ cmake python3 libllvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
@@ -58,6 +68,7 @@ stdenv.mkDerivation {
   patches = [
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     ./X86-support-extension.patch # Add support for i486 i586 i686 by reusing i386 config
+    ./gnu-install-dirs.patch
     # ld-wrapper dislikes `-rpath-link //nix/store`, so we normalize away the
     # extra `/`.
     ./normalize-var.patch
diff --git a/pkgs/development/compilers/llvm/git/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..909b5193ffd
--- /dev/null
+++ b/pkgs/development/compilers/llvm/git/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,55 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c5003b5efa1d..4fffb9721284 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,6 +5,8 @@
+ 
+ cmake_minimum_required(VERSION 3.13.4)
+ 
++include(GNUInstallDirs)
++
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index 1ada0ab30ba0..b4be6c4a3c73 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -66,7 +66,7 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+   set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
+@@ -98,23 +98,23 @@ endif()
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(COMPILER_RT_OUTPUT_LIBRARY_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib)
+-  extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" lib)
++  extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "${CMAKE_INSTALL_LIBDIR}")
+   set(COMPILER_RT_INSTALL_LIBRARY_DIR "${default_install_path}" CACHE PATH
+     "Path where built compiler-rt libraries should be installed.")
+ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(COMPILER_RT_OUTPUT_LIBRARY_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+-  extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "lib/${COMPILER_RT_OS_DIR}")
++  extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "${CMAKE_INSTALL_LIBDIR}/${COMPILER_RT_OS_DIR}")
+   set(COMPILER_RT_INSTALL_LIBRARY_DIR "${default_install_path}" CACHE PATH
+     "Path where built compiler-rt libraries should be installed.")
+ endif()
+-extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" bin)
++extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "${CMAKE_INSTALL_BINDIR}")
+ set(COMPILER_RT_INSTALL_BINARY_DIR "${default_install_path}" CACHE PATH
+   "Path where built compiler-rt executables should be installed.")
+-extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" include)
++extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "${CMAKE_INSTALL_INCLUDEDIR}")
+ set(COMPILER_RT_INSTALL_INCLUDE_DIR "${default_install_path}" CACHE PATH
+   "Path where compiler-rt headers should be installed.")
+-extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" share)
++extend_path(default_install_path "${COMPILER_RT_INSTALL_PATH}" "${CMAKE_INSTALL_DATADIR}")
+ set(COMPILER_RT_INSTALL_DATA_DIR "${default_install_path}" CACHE PATH
+   "Path where compiler-rt data files should be installed.")
+ 
diff --git a/pkgs/development/compilers/llvm/git/default.nix b/pkgs/development/compilers/llvm/git/default.nix
index 890270c851d..0f45acffb27 100644
--- a/pkgs/development/compilers/llvm/git/default.nix
+++ b/pkgs/development/compilers/llvm/git/default.nix
@@ -21,16 +21,16 @@ let
   release_version = "14.0.0";
   candidate = ""; # empty or "rcN"
   dash-candidate = lib.optionalString (candidate != "") "-${candidate}";
-  rev = "ee65938357d5fffe9e586fa155b37268b5a358ac"; # When using a Git commit
-  rev-version = "unstable-2021-08-13"; # When using a Git commit
+  rev = "fb1582f6c54422995c6fb61ba4c55126b357f64e"; # When using a Git commit
+  rev-version = "unstable-2022-01-07"; # When using a Git commit
   version = if rev != "" then rev-version else "${release_version}${dash-candidate}";
   targetConfig = stdenv.targetPlatform.config;
 
-  src = fetchFromGitHub {
+  monorepoSrc = fetchFromGitHub {
     owner = "llvm";
     repo = "llvm-project";
     rev = if rev != "" then rev else "llvmorg-${version}";
-    sha256 = "10ahc108wbg2rsp50j3mc8h018a453ykg1rivjkhizng80pyllm1";
+    sha256 = "1pkgdsscvf59i22ix763lp2z3sg0v2z2ywh0n07k3ki7q1qpqbhk";
   };
 
   llvm_meta = {
@@ -40,7 +40,7 @@ let
   };
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version src buildLlvmTools; });
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version monorepoSrc buildLlvmTools; });
     mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
@@ -218,7 +218,7 @@ let
   });
 
   libraries = lib.makeExtensible (libraries: let
-    callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python3 isl release_version version src; });
+    callPackage = newScope (libraries // buildLlvmTools // { inherit stdenv cmake libxml2 python3 isl release_version version monorepoSrc; });
   in {
 
     compiler-rt-libc = callPackage ./compiler-rt {
diff --git a/pkgs/development/compilers/llvm/git/libcxx/default.nix b/pkgs/development/compilers/llvm/git/libcxx/default.nix
index 0ddf28909b8..8891a69937a 100644
--- a/pkgs/development/compilers/llvm/git/libcxx/default.nix
+++ b/pkgs/development/compilers/llvm/git/libcxx/default.nix
@@ -1,4 +1,6 @@
-{ lib, stdenv, llvm_meta, src, cmake, python3, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta
+, monorepoSrc, runCommand
+, cmake, python3, fixDarwinDylibNames, version
 , libcxxabi
 , enableShared ? !stdenv.hostPlatform.isStatic
 
@@ -10,12 +12,26 @@
 , headersOnly ? false
 }:
 
+let
+  basename = "libcxx";
+in
+
 stdenv.mkDerivation rec {
-  pname = if headersOnly then "cxx-headers" else "libcxx";
+  pname = basename + lib.optionalString headersOnly "-headers";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/libcxx";
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${basename} "$out"
+    mkdir -p "$out/libcxxabi"
+    cp -r ${monorepoSrc}/libcxxabi/include "$out/libcxxabi"
+    mkdir -p "$out/llvm"
+    cp -r ${monorepoSrc}/llvm/cmake "$out/llvm"
+    cp -r ${monorepoSrc}/llvm/utils "$out/llvm"
+  '';
+
+  sourceRoot = "${src.name}/${basename}";
 
   outputs = [ "out" ] ++ lib.optional (!headersOnly) "dev";
 
diff --git a/pkgs/development/compilers/llvm/git/libcxx/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/libcxx/gnu-install-dirs.patch
index 744967a6ee0..0f1d5c411ab 100644
--- a/pkgs/development/compilers/llvm/git/libcxx/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/libcxx/gnu-install-dirs.patch
@@ -1,82 +1,85 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b1e25358d41a..7fe1f4d85401 100644
+index b0569a4a54ca..7d665f5a3258 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -26,6 +26,8 @@ set(LIBCXX_BINARY_INCLUDE_DIR "${LIBCXX_BINARY_DIR}/include/c++build")
- if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUILD)
-   project(libcxx CXX C)
+@@ -10,6 +10,8 @@ endif()
+ #===============================================================================
+ cmake_minimum_required(VERSION 3.13.4)
  
-+  include(GNUInstallDirs)
++include(GNUInstallDirs)
 +
-   set(PACKAGE_NAME libcxx)
-   set(PACKAGE_VERSION 13.0.0git)
-   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
-@@ -412,7 +414,7 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+ set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
+ 
+ # Add path for custom modules
+@@ -415,13 +417,13 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
    set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
    set(LIBCXX_GENERATED_INCLUDE_DIR "${LLVM_BINARY_DIR}/include/c++/v1")
    set(LIBCXX_GENERATED_INCLUDE_TARGET_DIR "${LLVM_BINARY_DIR}/include/${LLVM_DEFAULT_TARGET_TRIPLE}/c++/v1")
 -  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
-+  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
++  set(LIBCXX_INSTALL_LIBRARY_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}" CACHE PATH
        "Path where built libc++ libraries should be installed.")
-   set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
+-  set(LIBCXX_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXX_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libc++ runtime libraries should be installed.")
+-  set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
++  set(LIBCXX_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}/c++/v1" CACHE PATH
        "Path where target-agnostic libc++ headers should be installed.")
-@@ -426,7 +428,7 @@ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+-  set(LIBCXX_INSTALL_INCLUDE_TARGET_DIR "include/${LLVM_DEFAULT_TARGET_TRIPLE}/c++/v1" CACHE PATH
++  set(LIBCXX_INSTALL_INCLUDE_TARGET_DIR "${CMAKE_INSTALL_INCLUDEDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++/v1" CACHE PATH
+       "Path where target-specific libc++ headers should be installed.")
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXX_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+@@ -431,11 +433,11 @@ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
    set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
    set(LIBCXX_GENERATED_INCLUDE_DIR "${LLVM_BINARY_DIR}/include/c++/v1")
    set(LIBCXX_GENERATED_INCLUDE_TARGET_DIR "${LIBCXX_GENERATED_INCLUDE_DIR}")
 -  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX} CACHE PATH
 +  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} CACHE PATH
        "Path where built libc++ libraries should be installed.")
-   set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
+-  set(LIBCXX_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXX_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}/c++/v1" CACHE PATH
+       "Path where built libc++ runtime libraries should be installed.")
+-  set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
++  set(LIBCXX_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}/c++/v1" CACHE PATH
        "Path where target-agnostic libc++ headers should be installed.")
-@@ -436,7 +438,7 @@ else()
+   set(LIBCXX_INSTALL_INCLUDE_TARGET_DIR "${LIBCXX_INSTALL_INCLUDE_DIR}" CACHE PATH
+       "Path where target-specific libc++ headers should be installed.")
+@@ -443,11 +445,11 @@ else()
    set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
    set(LIBCXX_GENERATED_INCLUDE_DIR "${CMAKE_BINARY_DIR}/include/c++/v1")
    set(LIBCXX_GENERATED_INCLUDE_TARGET_DIR "${LIBCXX_GENERATED_INCLUDE_DIR}")
 -  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX} CACHE PATH
 +  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} CACHE PATH
        "Path where built libc++ libraries should be installed.")
-   set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
+-  set(LIBCXX_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXX_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libc++ runtime libraries should be installed.")
+-  set(LIBCXX_INSTALL_INCLUDE_DIR "include/c++/v1" CACHE PATH
++  set(LIBCXX_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}/c++/v1" CACHE PATH
        "Path where target-agnostic libc++ headers should be installed.")
+   set(LIBCXX_INSTALL_INCLUDE_TARGET_DIR "${LIBCXX_INSTALL_INCLUDE_DIR}" CACHE PATH
+       "Path where target-specific libc++ headers should be installed.")
 diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
-index 5a8a4a270a1a..c06bae0001aa 100644
+index 5a8a4a270a1a..d69405ddeeac 100644
 --- a/cmake/Modules/HandleLibCXXABI.cmake
 +++ b/cmake/Modules/HandleLibCXXABI.cmake
-@@ -63,7 +63,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
+@@ -1,8 +1,9 @@
+-
+ #===============================================================================
+ # Add an ABI library if appropriate
+ #===============================================================================
+ 
++include(GNUInstallDirs)
++
+ #
+ # _setup_abi: Set up the build to use an ABI library
+ #
+@@ -63,7 +64,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
  
          if (LIBCXX_INSTALL_HEADERS)
            install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
 -            DESTINATION include/c++/v1/${dstdir}
-+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
++            DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}"
              COMPONENT cxx-headers
              PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
              )
-diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
-index 496429f3841e..1a0c9c0a3159 100644
---- a/src/CMakeLists.txt
-+++ b/src/CMakeLists.txt
-@@ -376,21 +376,21 @@ if (LIBCXX_INSTALL_SHARED_LIBRARY)
-   install(TARGETS cxx_shared
-     ARCHIVE DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
-     LIBRARY DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
--    RUNTIME DESTINATION bin COMPONENT cxx)
-+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
- endif()
- 
- if (LIBCXX_INSTALL_STATIC_LIBRARY)
-   install(TARGETS cxx_static
-     ARCHIVE DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
-     LIBRARY DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
--    RUNTIME DESTINATION bin COMPONENT cxx)
-+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
- endif()
- 
- if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
-   install(TARGETS cxx_experimental
-     LIBRARY DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
-     ARCHIVE DESTINATION ${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
--    RUNTIME DESTINATION bin COMPONENT cxx)
-+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
- endif()
- 
- # NOTE: This install command must go after the cxx install command otherwise
diff --git a/pkgs/development/compilers/llvm/git/libcxxabi/default.nix b/pkgs/development/compilers/llvm/git/libcxxabi/default.nix
index 9f14f87a7a0..d64708ab040 100644
--- a/pkgs/development/compilers/llvm/git/libcxxabi/default.nix
+++ b/pkgs/development/compilers/llvm/git/libcxxabi/default.nix
@@ -1,4 +1,6 @@
-{ lib, stdenv, llvm_meta, cmake, python3, src, cxx-headers, libunwind, version
+{ lib, stdenv, llvm_meta, cmake, python3
+, monorepoSrc, runCommand
+, cxx-headers, libunwind, version
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
@@ -6,8 +8,19 @@ stdenv.mkDerivation rec {
   pname = "libcxxabi";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+    mkdir -p "$out/libcxx/src"
+    cp -r ${monorepoSrc}/libcxx/cmake "$out/libcxx"
+    cp -r ${monorepoSrc}/libcxx/include "$out/libcxx"
+    cp -r ${monorepoSrc}/libcxx/src/include "$out/libcxx/src"
+    mkdir -p "$out/llvm"
+    cp -r ${monorepoSrc}/llvm/cmake "$out/llvm"
+  '';
+
+  sourceRoot = "${src.name}/${pname}";
 
   outputs = [ "out" "dev" ];
 
diff --git a/pkgs/development/compilers/llvm/git/libcxxabi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/libcxxabi/gnu-install-dirs.patch
index 5d562dd59a9..a93348ded0c 100644
--- a/pkgs/development/compilers/llvm/git/libcxxabi/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/libcxxabi/gnu-install-dirs.patch
@@ -1,37 +1,46 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 9fb35860d483..5739d9e8af62 100644
+index 858f5d5cfd7f..16c67d7062be 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -27,6 +27,8 @@ set(LIBCXXABI_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
- if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXXABI_STANDALONE_BUILD)
-   project(libcxxabi CXX C)
+@@ -10,6 +10,8 @@ endif()
  
-+  include(GNUInstallDirs)
+ cmake_minimum_required(VERSION 3.13.4)
+ 
++include(GNUInstallDirs)
 +
-   set(PACKAGE_NAME libcxxabi)
-   set(PACKAGE_VERSION 11.0.0git)
-   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
-@@ -195,7 +197,7 @@ set(CMAKE_MODULE_PATH
+ set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
+ 
+ # Add path for custom modules
+@@ -213,9 +215,9 @@ set(CMAKE_MODULE_PATH
  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
    set(LIBCXXABI_HEADER_DIR ${LLVM_BINARY_DIR})
    set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
 -  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
 +  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
        "Path where built libc++abi libraries should be installed.")
+-  set(LIBCXXABI_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXXABI_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libc++abi runtime libraries should be installed.")
    if(LIBCXX_LIBDIR_SUBDIR)
      string(APPEND LIBCXXABI_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
-@@ -204,12 +206,12 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+@@ -224,16 +226,16 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
  elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
    set(LIBCXXABI_HEADER_DIR ${LLVM_BINARY_DIR})
    set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
 -  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX} CACHE PATH
 +  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} CACHE PATH
        "Path where built libc++abi libraries should be installed.")
+-  set(LIBCXXABI_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXXABI_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libc++abi runtime libraries should be installed.")
  else()
    set(LIBCXXABI_HEADER_DIR ${CMAKE_BINARY_DIR})
    set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
 -  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX} CACHE PATH
 +  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} CACHE PATH
        "Path where built libc++abi libraries should be installed.")
+-  set(LIBCXXABI_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBCXXABI_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libc++abi runtime libraries should be installed.")
  endif()
  
diff --git a/pkgs/development/compilers/llvm/git/libunwind/default.nix b/pkgs/development/compilers/llvm/git/libunwind/default.nix
index b6017e74172..c6d9eda5e47 100644
--- a/pkgs/development/compilers/llvm/git/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/git/libunwind/default.nix
@@ -1,4 +1,6 @@
-{ lib, stdenv, llvm_meta, version, src, cmake
+{ lib, stdenv, llvm_meta, version
+, monorepoSrc, runCommand
+, cmake
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
@@ -6,8 +8,20 @@ stdenv.mkDerivation rec {
   pname = "libunwind";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  # I am not so comfortable giving libc++ and friends the whole monorepo as
+  # requested, so I filter it to what is needed.
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+    mkdir -p "$out/libcxx"
+    cp -r ${monorepoSrc}/libcxx/cmake "$out/libcxx"
+    cp -r ${monorepoSrc}/libcxx/utils "$out/libcxx"
+    mkdir -p "$out/llvm"
+    cp -r ${monorepoSrc}/llvm/cmake "$out/llvm"
+  '';
+
+  sourceRoot = "${src.name}/${pname}";
 
   patches = [
     ./gnu-install-dirs.patch
diff --git a/pkgs/development/compilers/llvm/git/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/libunwind/gnu-install-dirs.patch
index 8cd25c56f8c..3f05d2a8726 100644
--- a/pkgs/development/compilers/llvm/git/libunwind/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/libunwind/gnu-install-dirs.patch
@@ -1,36 +1,65 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 81eddbc24879..e2afb2002150 100644
+index e3cc66dd2226..1299b596ce0d 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -23,6 +23,8 @@ set(LIBUNWIND_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
- if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
-   project(libunwind LANGUAGES C CXX ASM)
+@@ -8,6 +8,8 @@ endif()
  
-+  include(GNUInstallDirs)
+ cmake_minimum_required(VERSION 3.13.4)
+ 
++include(GNUInstallDirs)
 +
-   set(PACKAGE_NAME libunwind)
-   set(PACKAGE_VERSION 13.0.0git)
-   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
-@@ -116,7 +118,7 @@ set(CMAKE_MODULE_PATH
+ set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
+ 
+ # Add path for custom modules
+@@ -139,25 +141,27 @@ set(CMAKE_MODULE_PATH
  
  if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
    set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE})
 -  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
++  set(LIBUNWIND_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}" CACHE PATH
++      "Path where built libunwind headers should be installed.")
 +  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE} CACHE PATH
        "Path where built libunwind libraries should be installed.")
+-  set(LIBUNWIND_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBUNWIND_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libunwind runtime libraries should be installed.")
    if(LIBCXX_LIBDIR_SUBDIR)
      string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
-@@ -124,11 +126,11 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
    endif()
- elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
-   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+-  set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
 -  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX} CACHE PATH
-+  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} CACHE PATH
-       "Path where built libunwind libraries should be installed.")
+-      "Path where built libunwind libraries should be installed.")
+-  set(LIBUNWIND_INSTALL_RUNTIME_DIR bin CACHE PATH
+-      "Path where built libunwind runtime libraries should be installed.")
  else()
-   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
 -  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX} CACHE PATH
-+  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} CACHE PATH
++  if(LLVM_LIBRARY_OUTPUT_INTDIR)
++    set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
++  else()
++    set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
++  endif()
++  set(LIBUNWIND_INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}" CACHE PATH
++      "Path where built libunwind headers should be installed.")
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX} CACHE PATH
        "Path where built libunwind libraries should be installed.")
+-  set(LIBUNWIND_INSTALL_RUNTIME_DIR bin CACHE PATH
++  set(LIBUNWIND_INSTALL_RUNTIME_DIR "${CMAKE_INSTALL_BINDIR}" CACHE PATH
+       "Path where built libunwind runtime libraries should be installed.")
  endif()
  
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index c3bb1dd0f69f..adf1766c44cb 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -14,7 +14,7 @@ if(LIBUNWIND_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION "include/${dir}"
++      DESTINATION "${LIBUNWIND_INSTALL_INCLUDE_DIR}/${dir}"
+       COMPONENT unwind-headers
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
diff --git a/pkgs/development/compilers/llvm/git/lld/default.nix b/pkgs/development/compilers/llvm/git/lld/default.nix
index 34ac265f4bf..cdd2f5f0fa7 100644
--- a/pkgs/development/compilers/llvm/git/lld/default.nix
+++ b/pkgs/development/compilers/llvm/git/lld/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, llvm_meta
 , buildLlvmTools
-, src
+, monorepoSrc, runCommand
 , cmake
 , libxml2
 , libllvm
@@ -11,19 +11,30 @@ stdenv.mkDerivation rec {
   pname = "lld";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  # Blank llvm dir just so relative path works
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+    mkdir -p "$out/libunwind"
+    cp -r ${monorepoSrc}/libunwind/include "$out/libunwind"
+    mkdir -p "$out/llvm"
+  '';
+
+  sourceRoot = "${src.name}/${pname}";
 
   patches = [
     ./gnu-install-dirs.patch
+	# On Darwin the llvm-config is perhaps not working fine as the
+	# LLVM_MAIN_SRC_DIR is not getting set correctly, and the build fails as
+	# the include path is not correct.
+    ./fix-root-src-dir.patch
   ];
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ libllvm libxml2 ];
 
-  cmakeFlags = [
-    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
-  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+  cmakeFlags = lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
   ];
 
diff --git a/pkgs/development/compilers/llvm/git/lld/fix-root-src-dir.patch b/pkgs/development/compilers/llvm/git/lld/fix-root-src-dir.patch
new file mode 100644
index 00000000000..26ecef25649
--- /dev/null
+++ b/pkgs/development/compilers/llvm/git/lld/fix-root-src-dir.patch
@@ -0,0 +1,13 @@
+diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
+index e1a29b884d17..9d542f8fbfc1 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -64,7 +64,7 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+ 
+   set(LLVM_MAIN_INCLUDE_DIR ${MAIN_INCLUDE_DIR} CACHE PATH "Path to llvm/include")
+   set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
+-  set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
++  set(LLVM_MAIN_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../llvm" CACHE PATH "Path to LLVM source tree")
+ 
+   find_program(LLVM_TABLEGEN_EXE "llvm-tblgen" ${LLVM_TOOLS_BINARY_DIR}
+     NO_DEFAULT_PATH)
diff --git a/pkgs/development/compilers/llvm/git/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/lld/gnu-install-dirs.patch
index 61e2f0e4865..89a5822df49 100644
--- a/pkgs/development/compilers/llvm/git/lld/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/lld/gnu-install-dirs.patch
@@ -1,68 +1,22 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index d4e561b50d8f..cfa5bdd79c2a 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-   set(CMAKE_INCLUDE_CURRENT_DIR ON)
-   set(LLD_BUILT_STANDALONE TRUE)
- 
-+  include(GNUInstallDirs)
-+
-   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
-   if(NOT LLVM_CONFIG_PATH)
-     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
-@@ -179,7 +181,7 @@ include_directories(BEFORE
- 
- if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-   install(DIRECTORY include/
--    DESTINATION include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-     FILES_MATCHING
-     PATTERN "*.h"
-     )
 diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
-index 23df41312403..d62372c88de7 100644
+index dd2898ce6236..ebbea040ff54 100644
 --- a/cmake/modules/AddLLD.cmake
 +++ b/cmake/modules/AddLLD.cmake
-@@ -20,9 +20,9 @@ macro(add_lld_library name)
+@@ -18,8 +18,8 @@ macro(add_lld_library name)
      install(TARGETS ${name}
        COMPONENT ${name}
        ${export_to_lldtargets}
 -      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
 -      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
--      RUNTIME DESTINATION bin)
-+      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
-+      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
-+      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
++      LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}"
++      ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}"
+       RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
  
      if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
-       add_llvm_install_targets(install-${name}
-@@ -54,7 +54,7 @@ macro(add_lld_tool name)
- 
-     install(TARGETS ${name}
-       ${export_to_lldtargets}
--      RUNTIME DESTINATION bin
-+      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-       COMPONENT ${name})
- 
-     if(NOT CMAKE_CONFIGURATION_TYPES)
-@@ -69,5 +69,5 @@ endmacro()
+@@ -62,5 +62,5 @@ endmacro()
  macro(add_lld_symlink name dest)
    add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
    # Always generate install targets
 -  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
 +  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
  endmacro()
-diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
-index 5cff736ff57f..64e775c771b9 100644
---- a/tools/lld/CMakeLists.txt
-+++ b/tools/lld/CMakeLists.txt
-@@ -21,7 +21,7 @@ target_link_libraries(lld
-   )
- 
- install(TARGETS lld
--  RUNTIME DESTINATION bin)
-+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
- 
- if(NOT LLD_SYMLINKS_TO_CREATE)
-   set(LLD_SYMLINKS_TO_CREATE
diff --git a/pkgs/development/compilers/llvm/git/lldb/default.nix b/pkgs/development/compilers/llvm/git/lldb/default.nix
index 96d8b19ee41..a2c68b22477 100644
--- a/pkgs/development/compilers/llvm/git/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/git/lldb/default.nix
@@ -1,6 +1,6 @@
 { lib, stdenv, llvm_meta
 , runCommand
-, src
+, monorepoSrc
 , cmake
 , zlib
 , ncurses
@@ -27,8 +27,13 @@ stdenv.mkDerivation (rec {
   pname = "lldb";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+  '';
+
+  sourceRoot = "${src.name}/${pname}";
 
   patches = [
     ./procfs.patch
diff --git a/pkgs/development/compilers/llvm/git/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/lldb/gnu-install-dirs.patch
index afc945ce261..f69ed9e162f 100644
--- a/pkgs/development/compilers/llvm/git/lldb/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/lldb/gnu-install-dirs.patch
@@ -1,8 +1,8 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b5633e21c56a..f2f1035e9238 100644
+index 79d451965ed4..78188978d6de 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -10,6 +10,8 @@ set(CMAKE_MODULE_PATH
+@@ -12,6 +12,8 @@ set(CMAKE_MODULE_PATH
  # If we are not building as part of LLVM, build LLDB as a standalone project,
  # using LLVM as an external library.
  if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
@@ -12,10 +12,10 @@ index b5633e21c56a..f2f1035e9238 100644
    include(LLDBStandalone)
  
 diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
-index 4ed5c647c5d2..89f96e710d55 100644
+index 3291a7c808e1..b27d27ce6a87 100644
 --- a/cmake/modules/AddLLDB.cmake
 +++ b/cmake/modules/AddLLDB.cmake
-@@ -107,13 +107,13 @@ function(add_lldb_library name)
+@@ -109,7 +109,7 @@ function(add_lldb_library name)
    endif()
  
    if(PARAM_SHARED)
@@ -24,68 +24,13 @@ index 4ed5c647c5d2..89f96e710d55 100644
      if(PARAM_INSTALL_PREFIX)
        set(install_dest ${PARAM_INSTALL_PREFIX})
      endif()
-     # RUNTIME is relevant for DLL platforms, FRAMEWORK for macOS
-     install(TARGETS ${name} COMPONENT ${name}
--      RUNTIME DESTINATION bin
-+      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-       LIBRARY DESTINATION ${install_dest}
-       ARCHIVE DESTINATION ${install_dest}
-       FRAMEWORK DESTINATION ${install_dest})
-diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
-index 2fdf1502d055..37364341ff8b 100644
---- a/cmake/modules/LLDBConfig.cmake
-+++ b/cmake/modules/LLDBConfig.cmake
-@@ -225,7 +225,7 @@ include_directories(BEFORE
- if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-   install(DIRECTORY include/
-     COMPONENT lldb-headers
--    DESTINATION include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-     FILES_MATCHING
-     PATTERN "*.h"
-     PATTERN ".cmake" EXCLUDE
-@@ -233,7 +233,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
- 
-   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
-     COMPONENT lldb-headers
--    DESTINATION include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-     FILES_MATCHING
-     PATTERN "*.h"
-     PATTERN ".cmake" EXCLUDE
 diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
-index 734167e51bc5..f95761b5df58 100644
+index 7d48491ec89a..c04543585588 100644
 --- a/tools/intel-features/CMakeLists.txt
 +++ b/tools/intel-features/CMakeLists.txt
-@@ -65,4 +65,4 @@ if (LLDB_ENABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
- endif()
+@@ -30,4 +30,4 @@ add_lldb_library(lldbIntelFeatures SHARED
+   )
  
  install(TARGETS lldbIntelFeatures
 -  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
 +  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
-diff --git a/cmake/modules/LLDBStandalone.cmake b/cmake/modules/LLDBStandalone.cmake
-index 752113b..010f187 100644
---- a/cmake/modules/LLDBStandalone.cmake
-+++ b/cmake/modules/LLDBStandalone.cmake
-@@ -62,7 +62,7 @@ endif()
-
- # They are used as destination of target generators.
- set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
--set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
-+set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
- if(WIN32 OR CYGWIN)
-   # DLL platform -- put DLLs into bin.
-   set(LLVM_SHLIB_OUTPUT_INTDIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b5633e2..86e4738 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -79,7 +79,7 @@ if (LLDB_ENABLE_PYTHON)
-   if(LLDB_BUILD_FRAMEWORK)
-     set(lldb_python_target_dir "${LLDB_FRAMEWORK_ABSOLUTE_BUILD_DIR}/LLDB.framework/Resources/Python/lldb")
-   else()
--    set(lldb_python_target_dir "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/${LLDB_PYTHON_RELATIVE_PATH}/lldb")
-+    set(lldb_python_target_dir "${CMAKE_INSTALL_LIBDIR}/../${LLDB_PYTHON_RELATIVE_PATH}/lldb")
-   endif()
-   get_target_property(lldb_python_bindings_dir swig_wrapper_python BINARY_DIR)
-   finish_swig_python("lldb-python" "${lldb_python_bindings_dir}" "${lldb_python_target_dir}")
diff --git a/pkgs/development/compilers/llvm/git/llvm/default.nix b/pkgs/development/compilers/llvm/git/llvm/default.nix
index fc7030810c5..d2059cc66ba 100644
--- a/pkgs/development/compilers/llvm/git/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/git/llvm/default.nix
@@ -1,6 +1,7 @@
 { lib, stdenv, llvm_meta
 , pkgsBuildBuild
-, src
+, monorepoSrc
+, runCommand
 , fetchpatch
 , cmake
 , python3
@@ -22,7 +23,7 @@
   || stdenv.isAarch32 # broken for the armv7l builder
 )
 , enablePolly ? false
-}:
+} @args:
 
 let
   inherit (lib) optional optionals optionalString;
@@ -35,8 +36,16 @@ in stdenv.mkDerivation (rec {
   pname = "llvm";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  src = runCommand "${pname}-src-${version}" {} (''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+    cp -r ${monorepoSrc}/third-party "$out"
+  '' + lib.optionalString enablePolly ''
+    cp -r ${monorepoSrc}/polly "$out/llvm/tools"
+  '');
+
+  sourceRoot = "${src.name}/${pname}";
 
   outputs = [ "out" "lib" "dev" "python" ];
 
@@ -51,12 +60,6 @@ in stdenv.mkDerivation (rec {
   checkInputs = [ which ];
 
   patches = [
-    # When cross-compiling we configure llvm-config-native with an approximation
-    # of the flags used for the normal LLVM build. To avoid the need for building
-    # a native libLLVM.so (which would fail) we force llvm-config to be linked
-    # statically against the necessary LLVM components always.
-    ../../llvm-config-link-static.patch
-
     ./gnu-install-dirs.patch
   ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
diff --git a/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs-polly.patch
index 68f3c45396f..98e998e65a9 100644
--- a/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs-polly.patch
+++ b/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs-polly.patch
@@ -1,20 +1,17 @@
 diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
-index ca7c04c565bb..6ed5db5dd4f8 100644
+index ca7c04c565bb..6a6155806ffa 100644
 --- a/tools/polly/CMakeLists.txt
 +++ b/tools/polly/CMakeLists.txt
-@@ -2,7 +2,11 @@
- if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+@@ -3,6 +3,8 @@ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
    project(Polly)
    cmake_minimum_required(VERSION 3.13.4)
-+endif()
-+
-+include(GNUInstallDirs)
  
-+if (NOT DEFINED LLVM_MAIN_SRC_DIR)
++  include(GNUInstallDirs)
++
    # Where is LLVM installed?
    find_package(LLVM CONFIG REQUIRED)
    set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
-@@ -122,13 +126,13 @@ include_directories(
+@@ -122,13 +124,13 @@ include_directories(
  
  if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
    install(DIRECTORY include/
@@ -91,10 +88,10 @@ index 518a09b45a42..bd9d6f5542ad 100644
    set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
  endmacro(add_polly_library)
 diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
-index 8991094d92c7..178d8ad606bb 100644
+index e3a5683fccdc..293b482eb28a 100644
 --- a/tools/polly/lib/External/CMakeLists.txt
 +++ b/tools/polly/lib/External/CMakeLists.txt
-@@ -275,7 +275,7 @@ if (POLLY_BUNDLED_ISL)
+@@ -290,7 +290,7 @@ if (POLLY_BUNDLED_ISL)
      install(DIRECTORY
        ${ISL_SOURCE_DIR}/include/
        ${ISL_BINARY_DIR}/include/
diff --git a/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs.patch
index 18fa5fc6d89..55862ab3930 100644
--- a/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/git/llvm/gnu-install-dirs.patch
@@ -1,23 +1,10 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 135036f509d2..265c36f8211b 100644
+index fec956091cd5..5a766f5c5d7c 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -270,15 +270,21 @@ if (CMAKE_BUILD_TYPE AND
-   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
- endif()
- 
-+include(GNUInstallDirs)
-+
- set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
- 
--set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
-+set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
-+    "Path for binary subdirectory (defaults to 'bin')")
- mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
- 
- set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
-     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
- mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+@@ -303,6 +303,9 @@ set(LLVM_EXAMPLES_INSTALL_DIR "examples" CACHE STRING
+     "Path for examples subdirectory (enabled by LLVM_BUILD_EXAMPLES=ON) (defaults to 'examples')")
+ mark_as_advanced(LLVM_EXAMPLES_INSTALL_DIR)
  
 +set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
 +	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
@@ -25,70 +12,22 @@ index 135036f509d2..265c36f8211b 100644
  # They are used as destination of target generators.
  set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
  set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
-@@ -581,9 +587,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
- option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
- option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
- 
--set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
-+set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
-     CACHE STRING "Doxygen-generated HTML documentation install directory")
--set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
-+set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
-     CACHE STRING "OCamldoc-generated HTML documentation install directory")
- 
- option (LLVM_BUILD_EXTERNAL_COMPILER_RT
-@@ -1048,7 +1054,7 @@ endif()
- 
- if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-   install(DIRECTORY include/llvm include/llvm-c
--    DESTINATION include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-     COMPONENT llvm-headers
-     FILES_MATCHING
-     PATTERN "*.def"
-@@ -1059,7 +1065,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-     )
- 
-   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
--    DESTINATION include
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-     COMPONENT llvm-headers
-     FILES_MATCHING
-     PATTERN "*.def"
-@@ -1073,13 +1079,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
- 
-   if (LLVM_INSTALL_MODULEMAPS)
-     install(DIRECTORY include/llvm include/llvm-c
--            DESTINATION include
-+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-             COMPONENT llvm-headers
-             FILES_MATCHING
-             PATTERN "module.modulemap"
-             )
-     install(FILES include/llvm/module.install.modulemap
--            DESTINATION include/llvm
-+            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
-             COMPONENT llvm-headers
-             RENAME "module.extern.modulemap"
-             )
 diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
-index 9c2b85374307..5531ceeb2eeb 100644
+index fed1fec7d72e..4baed19b9e98 100644
 --- a/cmake/modules/AddLLVM.cmake
 +++ b/cmake/modules/AddLLVM.cmake
-@@ -818,9 +818,9 @@ macro(add_llvm_library name)
+@@ -838,8 +838,8 @@ macro(add_llvm_library name)
        get_target_export_arg(${name} LLVM export_to_llvmexports ${umbrella})
        install(TARGETS ${name}
                ${export_to_llvmexports}
 -              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
 -              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
--              RUNTIME DESTINATION bin COMPONENT ${name})
-+              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
-+              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
-+              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
++              LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" COMPONENT ${name}
++              ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" COMPONENT ${name}
+               RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}" COMPONENT ${name})
  
        if (NOT LLVM_ENABLE_IDE)
-         add_llvm_install_targets(install-${name}
-@@ -1036,7 +1036,7 @@ function(process_llvm_pass_plugins)
+@@ -1056,7 +1056,7 @@ function(process_llvm_pass_plugins)
            "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
        install(FILES
            ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
@@ -97,16 +36,7 @@ index 9c2b85374307..5531ceeb2eeb 100644
            COMPONENT cmake-exports)
  
        set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
-@@ -1250,7 +1250,7 @@ macro(add_llvm_example name)
-   endif()
-   add_llvm_executable(${name} ${ARGN})
-   if( LLVM_BUILD_EXAMPLES )
--    install(TARGETS ${name} RUNTIME DESTINATION examples)
-+    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
-   endif()
-   set_target_properties(${name} PROPERTIES FOLDER "Examples")
- endmacro(add_llvm_example name)
-@@ -1868,7 +1868,7 @@ function(llvm_install_library_symlink name dest type)
+@@ -1902,7 +1902,7 @@ function(llvm_install_library_symlink name dest type)
    set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
    set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
  
@@ -115,7 +45,7 @@ index 9c2b85374307..5531ceeb2eeb 100644
    if(WIN32 AND "${type}" STREQUAL "SHARED")
      set(output_dir bin)
    endif()
-@@ -1879,7 +1879,7 @@ function(llvm_install_library_symlink name dest type)
+@@ -1913,7 +1913,7 @@ function(llvm_install_library_symlink name dest type)
  
  endfunction()
  
@@ -124,7 +54,7 @@ index 9c2b85374307..5531ceeb2eeb 100644
    cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
    foreach(path ${CMAKE_MODULE_PATH})
      if(EXISTS ${path}/LLVMInstallSymlink.cmake)
-@@ -1902,7 +1902,7 @@ function(llvm_install_symlink name dest)
+@@ -1936,7 +1936,7 @@ function(llvm_install_symlink name dest)
    set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
  
    install(SCRIPT ${INSTALL_SYMLINK}
@@ -133,7 +63,7 @@ index 9c2b85374307..5531ceeb2eeb 100644
            COMPONENT ${component})
  
    if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
-@@ -1985,7 +1985,8 @@ function(add_llvm_tool_symlink link_name target)
+@@ -2019,7 +2019,8 @@ function(add_llvm_tool_symlink link_name target)
      endif()
  
      if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
@@ -143,7 +73,7 @@ index 9c2b85374307..5531ceeb2eeb 100644
      endif()
    endif()
  endfunction()
-@@ -2114,9 +2115,9 @@ function(llvm_setup_rpath name)
+@@ -2148,9 +2149,9 @@ function(llvm_setup_rpath name)
      # Since BUILD_SHARED_LIBS is only recommended for use by developers,
      # hardcode the rpath to build/install lib dir first in this mode.
      # FIXME: update this when there is better solution.
@@ -156,10 +86,10 @@ index 9c2b85374307..5531ceeb2eeb 100644
        set_property(TARGET ${name} APPEND_STRING PROPERTY
                     LINK_FLAGS " -Wl,-z,origin ")
 diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
-index 554046b20edf..4d1ad980641e 100644
+index 891c9e6d618c..8d963f3b0069 100644
 --- a/cmake/modules/AddOCaml.cmake
 +++ b/cmake/modules/AddOCaml.cmake
-@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+@@ -147,9 +147,9 @@ function(add_ocaml_library name)
    endforeach()
  
    if( APPLE )
@@ -171,86 +101,55 @@ index 554046b20edf..4d1ad980641e 100644
    endif()
    list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
  
-diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
-index e80c3b5c1cac..482f6d715ef5 100644
---- a/cmake/modules/AddSphinxTarget.cmake
-+++ b/cmake/modules/AddSphinxTarget.cmake
-@@ -90,7 +90,7 @@ function (add_sphinx_target builder project)
-         endif()
-       elseif (builder STREQUAL html)
-         string(TOUPPER "${project}" project_upper)
--        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
-+        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
-             CACHE STRING "HTML documentation install directory for ${project}")
- 
-         # '/.' indicates: copy the contents of the directory directly into
 diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
-index 51b6a4fdc284..4adc2acfc074 100644
+index cea0c1df0a14..eedcd9450312 100644
 --- a/cmake/modules/CMakeLists.txt
 +++ b/cmake/modules/CMakeLists.txt
-@@ -1,6 +1,6 @@
+@@ -2,7 +2,7 @@ include(ExtendPath)
  include(LLVMDistributionSupport)
+ include(FindPrefixFromConfig)
  
 -set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
 +set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
  set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
  
  # First for users who use an installed LLVM, create the LLVMExports.cmake file.
-@@ -109,13 +109,13 @@ foreach(p ${_count})
-   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
- get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
- endforeach(p)
--set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
-+set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
- set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
- set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
--set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
-+set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
- set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
- set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
--set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
-+set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
- 
- # Generate a default location for lit
- if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
+@@ -122,7 +122,7 @@ set(LLVM_CONFIG_INCLUDE_DIRS
+   )
+ list(REMOVE_DUPLICATES LLVM_CONFIG_INCLUDE_DIRS)
+ 
+-extend_path(LLVM_CONFIG_LIBRARY_DIR "\${LLVM_INSTALL_PREFIX}" "lib\${LLVM_LIBDIR_SUFFIX}")
++extend_path(LLVM_CONFIG_LIBRARY_DIR "\${LLVM_INSTALL_PREFIX}" "${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_LIBRARY_DIRS
+   "${LLVM_CONFIG_LIBRARY_DIR}"
+   # FIXME: Should there be other entries here?
 diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
-index 3e6a2c9a2648..52e14d955c60 100644
+index b5c35f706cb7..9261ab797de6 100644
 --- a/cmake/modules/LLVMInstallSymlink.cmake
 +++ b/cmake/modules/LLVMInstallSymlink.cmake
-@@ -4,7 +4,7 @@
+@@ -6,7 +6,7 @@ include(GNUInstallDirs)
  
  function(install_symlink name target outdir)
    set(DESTDIR $ENV{DESTDIR})
--  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}")
 +  set(bindir "${DESTDIR}${outdir}/")
  
    message(STATUS "Creating ${name}")
  
 diff --git a/docs/CMake.rst b/docs/CMake.rst
-index f1ac2c7d4934..c6e1469b5e13 100644
+index 044ec8a4d39d..504d0eac3ade 100644
 --- a/docs/CMake.rst
 +++ b/docs/CMake.rst
-@@ -202,7 +202,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+@@ -224,7 +224,7 @@ description is in `LLVM-related variables`_ below.
  **LLVM_LIBDIR_SUFFIX**:STRING
    Extra suffix to append to the directory where libraries are to be
    installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
 -  to install libraries to ``/usr/lib64``.
 +  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
  
- Rarely-used CMake variables
- ---------------------------
-@@ -551,8 +551,8 @@ LLVM-specific variables
- 
- **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
-   The path to install Doxygen-generated HTML documentation to. This path can
--  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
--  `share/doc/llvm/doxygen-html`.
-+  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
-+  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
- 
- **LLVM_LINK_LLVM_DYLIB**:BOOL
-   If enabled, tools will be linked with the libLLVM shared library. Defaults
-@@ -792,9 +792,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ **LLVM_PARALLEL_{COMPILE,LINK}_JOBS**:STRING
+   Building the llvm toolchain can use a lot of resources, particularly
+@@ -910,9 +910,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
  
  This file is available in two different locations.
  
@@ -265,18 +164,6 @@ index f1ac2c7d4934..c6e1469b5e13 100644
  
  * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
    ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
-diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
-index bb96edb4b4bf..678c22fb43c8 100644
---- a/examples/Bye/CMakeLists.txt
-+++ b/examples/Bye/CMakeLists.txt
-@@ -14,6 +14,6 @@ if (NOT WIN32)
-     BUILDTREE_ONLY
-    )
- 
--  install(TARGETS ${name} RUNTIME DESTINATION examples)
-+  install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
-   set_target_properties(${name} PROPERTIES FOLDER "Examples")
- endif()
 diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
 index b46319f24fc8..2feabd1954e4 100644
 --- a/include/llvm/CMakeLists.txt
@@ -289,93 +176,45 @@ index b46319f24fc8..2feabd1954e4 100644
 +  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
  endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
 diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
-index ebe5b73a5c65..70c497be12f5 100644
+index abbb8a450da6..70c497be12f5 100644
 --- a/tools/llvm-config/BuildVariables.inc.in
 +++ b/tools/llvm-config/BuildVariables.inc.in
-@@ -23,6 +23,10 @@
+@@ -23,7 +23,10 @@
  #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
  #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
  #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
 +#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
 +#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
-+#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
+ #define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
 +#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
  #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
  #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
  #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
 diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
-index 1a2f04552d13..44fa7d3eec6b 100644
+index 8ed88f33ead4..5e7184bab90d 100644
 --- a/tools/llvm-config/llvm-config.cpp
 +++ b/tools/llvm-config/llvm-config.cpp
-@@ -357,12 +357,26 @@ int main(int argc, char **argv) {
-         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
-   } else {
-     ActivePrefix = CurrentExecPrefix;
--    ActiveIncludeDir = ActivePrefix + "/include";
--    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
--    sys::fs::make_absolute(ActivePrefix, path);
--    ActiveBinDir = std::string(path.str());
+@@ -363,12 +363,20 @@ int main(int argc, char **argv) {
+       ActiveIncludeDir = std::string(Path.str());
+     }
+     {
+-      SmallString<256> Path(LLVM_TOOLS_INSTALL_DIR);
++      SmallString<256> Path(LLVM_INSTALL_BINDIR);
+       sys::fs::make_absolute(ActivePrefix, Path);
+       ActiveBinDir = std::string(Path.str());
+     }
 -    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
 -    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
 +    {
-+      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
-+      sys::fs::make_absolute(ActivePrefix, path);
-+      ActiveIncludeDir = std::string(path.str());
-+    }
-+    {
-+      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
-+      sys::fs::make_absolute(ActivePrefix, path);
-+      ActiveBinDir = std::string(path.str());
-+    }
-+    {
-+      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
-+      sys::fs::make_absolute(ActivePrefix, path);
-+      ActiveLibDir = std::string(path.str());
++      SmallString<256> Path(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX);
++      sys::fs::make_absolute(ActivePrefix, Path);
++      ActiveLibDir = std::string(Path.str());
 +    }
 +    {
-+      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
-+      sys::fs::make_absolute(ActivePrefix, path);
-+      ActiveCMakeDir = std::string(path.str());
++      SmallString<256> Path(LLVM_INSTALL_CMAKEDIR);
++      sys::fs::make_absolute(ActivePrefix, Path);
++      ActiveCMakeDir = std::string(Path.str());
 +    }
      ActiveIncludeOption = "-I" + ActiveIncludeDir;
    }
  
-diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
-index 0af29ad762c5..37b99b83e35c 100644
---- a/tools/lto/CMakeLists.txt
-+++ b/tools/lto/CMakeLists.txt
-@@ -33,7 +33,7 @@ add_llvm_library(${LTO_LIBRARY_NAME} ${LTO_LIBRARY_TYPE} INSTALL_WITH_TOOLCHAIN
-     ${SOURCES} DEPENDS intrinsics_gen)
- 
- install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
--  DESTINATION include/llvm-c
-+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
-   COMPONENT LTO)
- 
- if (APPLE)
-diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
-index ead73ec13a8f..250362021f17 100644
---- a/tools/opt-viewer/CMakeLists.txt
-+++ b/tools/opt-viewer/CMakeLists.txt
-@@ -8,7 +8,7 @@ set (files
- 
- foreach (file ${files})
-   install(PROGRAMS ${file}
--    DESTINATION share/opt-viewer
-+    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
-     COMPONENT opt-viewer)
- endforeach (file)
- 
-diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
-index 865436247270..ce1daa62f6ab 100644
---- a/tools/remarks-shlib/CMakeLists.txt
-+++ b/tools/remarks-shlib/CMakeLists.txt
-@@ -19,7 +19,7 @@ if(LLVM_ENABLE_PIC)
-   endif()
-   
-   install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
--    DESTINATION include/llvm-c
-+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
-     COMPONENT Remarks)
- 
-   if (APPLE)
diff --git a/pkgs/development/compilers/llvm/git/openmp/default.nix b/pkgs/development/compilers/llvm/git/openmp/default.nix
index c5a33df9756..7add0c7ed46 100644
--- a/pkgs/development/compilers/llvm/git/openmp/default.nix
+++ b/pkgs/development/compilers/llvm/git/openmp/default.nix
@@ -1,10 +1,13 @@
 { lib
 , stdenv
 , llvm_meta
-, src
+, monorepoSrc
+, runCommand
 , cmake
 , llvm
+, clang-unwrapped
 , perl
+, pkg-config
 , version
 }:
 
@@ -12,10 +15,22 @@ stdenv.mkDerivation rec {
   pname = "openmp";
   inherit version;
 
-  inherit src;
-  sourceRoot = "source/${pname}";
+  src = runCommand "${pname}-src-${version}" {} ''
+    mkdir -p "$out"
+    cp -r ${monorepoSrc}/cmake "$out"
+    cp -r ${monorepoSrc}/${pname} "$out"
+  '';
 
-  nativeBuildInputs = [ cmake perl ];
+  sourceRoot = "${src.name}/${pname}";
+
+  patches = [
+    ./gnu-install-dirs.patch
+    ./fix-find-tool.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [ cmake perl pkg-config clang-unwrapped ];
   buildInputs = [ llvm ];
 
   cmakeFlags = [
diff --git a/pkgs/development/compilers/llvm/git/openmp/fix-find-tool.patch b/pkgs/development/compilers/llvm/git/openmp/fix-find-tool.patch
new file mode 100644
index 00000000000..b5d0e7b4177
--- /dev/null
+++ b/pkgs/development/compilers/llvm/git/openmp/fix-find-tool.patch
@@ -0,0 +1,54 @@
+diff --git a/libomptarget/DeviceRTL/CMakeLists.txt b/libomptarget/DeviceRTL/CMakeLists.txt
+index 242df638f80d..a4654e96371f 100644
+--- a/libomptarget/DeviceRTL/CMakeLists.txt
++++ b/libomptarget/DeviceRTL/CMakeLists.txt
+@@ -25,16 +25,16 @@ endif()
+ 
+ if (LLVM_DIR)
+   # Builds that use pre-installed LLVM have LLVM_DIR set.
+-  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
++  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
+   find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
+-    NO_DEFAULT_PATH)
+-  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
++    REQUIRED)
++  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
+   libomptarget_say("Building DeviceRTL. Using clang: ${CLANG_TOOL}")
+ elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
+   # LLVM in-tree builds may use CMake target names to discover the tools.
+-  set(CLANG_TOOL $<TARGET_FILE:clang>)
+-  set(LINK_TOOL $<TARGET_FILE:llvm-link>)
+-  set(OPT_TOOL $<TARGET_FILE:opt>)
++  set(CLANG_TOOL $<TARGET_FILE:clang> REQUIRED)
++  set(LINK_TOOL $<TARGET_FILE:llvm-link> REQUIRED)
++  set(OPT_TOOL $<TARGET_FILE:opt> REQUIRED)
+   libomptarget_say("Building DeviceRTL. Using clang from in-tree build")
+ else()
+   libomptarget_say("Not building DeviceRTL. No appropriate clang found")
+diff --git a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
+index 3f4c02671aeb..be9f4677d7b5 100644
+--- a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
++++ b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
+@@ -38,16 +38,16 @@ endif()
+ 
+ if (LLVM_DIR)
+   # Builds that use pre-installed LLVM have LLVM_DIR set.
+-  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
++  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
+   find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
+-    NO_DEFAULT_PATH)
+-  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
++    REQUIRED)
++  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
+   libomptarget_say("Building AMDGCN device RTL. Using clang: ${CLANG_TOOL}")
+ elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
+   # LLVM in-tree builds may use CMake target names to discover the tools.
+-  set(CLANG_TOOL $<TARGET_FILE:clang>)
+-  set(LINK_TOOL $<TARGET_FILE:llvm-link>)
+-  set(OPT_TOOL $<TARGET_FILE:opt>)
++  set(CLANG_TOOL $<TARGET_FILE:clang> REQUIRED)
++  set(LINK_TOOL $<TARGET_FILE:llvm-link> REQUIRED)
++  set(OPT_TOOL $<TARGET_FILE:opt> REQUIRED)
+   libomptarget_say("Building AMDGCN device RTL. Using clang from in-tree build")
+ else()
+   libomptarget_say("Not building AMDGCN device RTL. No appropriate clang found")
diff --git a/pkgs/development/compilers/llvm/git/openmp/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/git/openmp/gnu-install-dirs.patch
new file mode 100644
index 00000000000..352a4692311
--- /dev/null
+++ b/pkgs/development/compilers/llvm/git/openmp/gnu-install-dirs.patch
@@ -0,0 +1,89 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 7f11a05f5622..fb90f8f6a49b 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,8 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
+   set(OPENMP_STANDALONE_BUILD TRUE)
+   project(openmp C CXX)
+ 
++  include(GNUInstallDirs)
++
+   # CMAKE_BUILD_TYPE was not set, default to Release.
+   if (NOT CMAKE_BUILD_TYPE)
+     set(CMAKE_BUILD_TYPE Release)
+@@ -19,7 +21,7 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
+   set(OPENMP_LIBDIR_SUFFIX "" CACHE STRING
+     "Suffix of lib installation directory, e.g. 64 => lib64")
+   # Do not use OPENMP_LIBDIR_SUFFIX directly, use OPENMP_INSTALL_LIBDIR.
+-  set(OPENMP_INSTALL_LIBDIR "lib${OPENMP_LIBDIR_SUFFIX}")
++  set(OPENMP_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}${OPENMP_LIBDIR_SUFFIX}")
+ 
+   # Group test settings.
+   set(OPENMP_TEST_C_COMPILER ${CMAKE_C_COMPILER} CACHE STRING
+@@ -30,7 +32,7 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
+ else()
+   set(OPENMP_ENABLE_WERROR ${LLVM_ENABLE_WERROR})
+   # If building in tree, we honor the same install suffix LLVM uses.
+-  set(OPENMP_INSTALL_LIBDIR "lib${LLVM_LIBDIR_SUFFIX}")
++  set(OPENMP_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ 
+   if (NOT MSVC)
+     set(OPENMP_TEST_C_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)
+index 0e1ce2afd154..8b3810f83713 100644
+--- a/libomptarget/plugins/amdgpu/CMakeLists.txt
++++ b/libomptarget/plugins/amdgpu/CMakeLists.txt
+@@ -80,7 +80,7 @@ add_library(omptarget.rtl.amdgpu SHARED
+ 
+ # Install plugin under the lib destination folder.
+ # When we build for debug, OPENMP_LIBDIR_SUFFIX get set to -debug
+-install(TARGETS omptarget.rtl.amdgpu LIBRARY DESTINATION "lib${OPENMP_LIBDIR_SUFFIX}")
++install(TARGETS omptarget.rtl.amdgpu LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}${OPENMP_LIBDIR_SUFFIX}")
+ set_property(TARGET omptarget.rtl.amdgpu PROPERTY INSTALL_RPATH_USE_LINK_PATH ON)
+ 
+ if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+diff --git a/libomptarget/plugins/ve/CMakeLists.txt b/libomptarget/plugins/ve/CMakeLists.txt
+index 16ce0891ca23..db30ee9c769f 100644
+--- a/libomptarget/plugins/ve/CMakeLists.txt
++++ b/libomptarget/plugins/ve/CMakeLists.txt
+@@ -32,7 +32,7 @@ if(${LIBOMPTARGET_DEP_VEO_FOUND})
+ 
+   # Install plugin under the lib destination folder.
+   install(TARGETS "omptarget.rtl.${tmachine_libname}"
+-    LIBRARY DESTINATION lib${OPENMP_LIBDIR_SUFFIX})
++    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${OPENMP_LIBDIR_SUFFIX})
+ 
+   target_link_libraries(
+     "omptarget.rtl.${tmachine_libname}"
+diff --git a/runtime/src/CMakeLists.txt b/runtime/src/CMakeLists.txt
+index e4f4e6e1e73f..1164b3b22b0e 100644
+--- a/runtime/src/CMakeLists.txt
++++ b/runtime/src/CMakeLists.txt
+@@ -346,13 +346,13 @@ add_dependencies(libomp-micro-tests libomp-test-deps)
+ # We want to install libomp in DESTDIR/CMAKE_INSTALL_PREFIX/lib
+ # We want to install headers in DESTDIR/CMAKE_INSTALL_PREFIX/include
+ if(${OPENMP_STANDALONE_BUILD})
+-  set(LIBOMP_HEADERS_INSTALL_PATH include)
++  set(LIBOMP_HEADERS_INSTALL_PATH "${CMAKE_INSTALL_INCLUDEDIR}")
+ else()
+   string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION ${PACKAGE_VERSION})
+   set(LIBOMP_HEADERS_INSTALL_PATH "${OPENMP_INSTALL_LIBDIR}/clang/${CLANG_VERSION}/include")
+ endif()
+ if(WIN32)
+-  install(TARGETS omp RUNTIME DESTINATION bin)
++  install(TARGETS omp RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+   install(TARGETS ${LIBOMP_IMP_LIB_TARGET} ARCHIVE DESTINATION "${OPENMP_INSTALL_LIBDIR}")
+   # Create aliases (regular copies) of the library for backwards compatibility
+   set(LIBOMP_ALIASES "libiomp5md")
+diff --git a/tools/multiplex/CMakeLists.txt b/tools/multiplex/CMakeLists.txt
+index 64317c112176..4002784da736 100644
+--- a/tools/multiplex/CMakeLists.txt
++++ b/tools/multiplex/CMakeLists.txt
+@@ -4,7 +4,7 @@ if(LIBOMP_OMPT_SUPPORT)
+   add_library(ompt-multiplex INTERFACE)
+   target_include_directories(ompt-multiplex INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+ 
+-  install(FILES ompt-multiplex.h DESTINATION include)
++  install(FILES ompt-multiplex.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ 
+   add_subdirectory(tests)
+ endif()