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-rw-r--r--pkgs/development/compilers/llvm/12/clang/default.nix23
-rw-r--r--pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch235
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/X86-support-extension.patch (renamed from pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-X86-support-extension.patch)0
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/armv7l.patch (renamed from pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-armv7l.patch)0
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/codesign.patch (renamed from pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-codesign.patch)0
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/default.nix19
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch129
-rw-r--r--pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch16
-rw-r--r--pkgs/development/compilers/llvm/12/default.nix32
-rw-r--r--pkgs/development/compilers/llvm/12/libcxxabi/default.nix2
-rw-r--r--pkgs/development/compilers/llvm/12/libcxxabi/wasm.patch (renamed from pkgs/development/compilers/llvm/12/libcxxabi/libcxxabi-wasm.patch)0
-rw-r--r--pkgs/development/compilers/llvm/12/libunwind/default.nix6
-rw-r--r--pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch34
-rw-r--r--pkgs/development/compilers/llvm/12/lld/default.nix24
-rw-r--r--pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch68
-rw-r--r--pkgs/development/compilers/llvm/12/lldb/default.nix35
-rw-r--r--pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch65
-rw-r--r--pkgs/development/compilers/llvm/12/lldb/procfs.patch (renamed from pkgs/development/compilers/llvm/12/lldb/lldb-procfs.patch)0
-rw-r--r--pkgs/development/compilers/llvm/12/lldb/resource-dir.patch13
-rw-r--r--pkgs/development/compilers/llvm/12/llvm/default.nix54
-rw-r--r--pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch105
-rw-r--r--pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch417
-rw-r--r--pkgs/development/compilers/llvm/12/llvm/outputs.patch (renamed from pkgs/development/compilers/llvm/12/llvm/llvm-outputs.patch)0
23 files changed, 1212 insertions, 65 deletions
diff --git a/pkgs/development/compilers/llvm/12/clang/default.nix b/pkgs/development/compilers/llvm/12/clang/default.nix
index ab329e3d85d..3d1106dbc52 100644
--- a/pkgs/development/compilers/llvm/12/clang/default.nix
+++ b/pkgs/development/compilers/llvm/12/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -18,26 +19,31 @@ let
       unpackFile ${clang-tools-extra_src}
     '';
 
-    nativeBuildInputs = [ cmake python3 lld ]
+    nativeBuildInputs = [ cmake python3 ]
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++14"
       "-DCLANGD_BUILD_XPC=OFF"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
     patches = [
       ./purity.patch
       # https://reviews.llvm.org/D51899
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -51,12 +57,12 @@ let
       sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -75,11 +81,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = llvm_meta // {
diff --git a/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..b834d386b4e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch
@@ -0,0 +1,235 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9e74014134a0..976e6a1757fd 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 )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   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
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -425,7 +427,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -445,7 +447,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
+   install(PROGRAMS utils/bash-autocomplete.sh
+-          DESTINATION share/clang
++          DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+           COMPONENT bash-autocomplete)
+   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
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -123,9 +123,9 @@ macro(add_clang_library name)
+         install(TARGETS ${lib}
+           COMPONENT ${lib}
+           ${export_to_clangtargets}
+-          LIBRARY DESTINATION lib${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 ${CMAKE_INSTALL_BINDIR})
+ 
+         if (NOT LLVM_ENABLE_IDE)
+           add_llvm_install_targets(install-${lib}
+@@ -170,7 +170,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -185,7 +185,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index b2c0ce8dd4a0..19e5443d8c25 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -215,7 +215,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ 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
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 51ff2e7e1565..1ed5f8a079a1 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -166,7 +166,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -196,7 +196,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ 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
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -47,7 +47,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -61,7 +61,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+     install(PROGRAMS libexec/${LibexecFile}
+-            DESTINATION libexec
++            DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -89,7 +89,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+     install(FILES share/scan-build/${ShareFile}
+-            DESTINATION share/scan-build
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build
+             COMPONENT scan-build)
+   endforeach()
+ 
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index dd3d33439299..fea19c12ce70 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -19,7 +19,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-view)
+   endforeach()
+ 
+@@ -33,7 +33,7 @@ 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}
+-            DESTINATION share/scan-view
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view
+             COMPONENT scan-view)
+   endforeach()
+ 
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 62f2de0cb15c..6aa66825b6ec 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -10,7 +10,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+ install(PROGRAMS ${CLANG_HMAPTOOL}
+-        DESTINATION bin
++        DESTINATION ${CMAKE_INSTALL_BINDIR}
+         COMPONENT hmaptool)
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-X86-support-extension.patch b/pkgs/development/compilers/llvm/12/compiler-rt/X86-support-extension.patch
index f6f9336ad5a..f6f9336ad5a 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-X86-support-extension.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/X86-support-extension.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/12/compiler-rt/armv7l.patch
index 120cfe6feb2..120cfe6feb2 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-armv7l.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/armv7l.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-codesign.patch b/pkgs/development/compilers/llvm/12/compiler-rt/codesign.patch
index 3cc12b94b20..3cc12b94b20 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-codesign.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/codesign.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/default.nix b/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
index bf7f4bc4312..b880a0071b9 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   inherit version;
   src = fetch pname "0d444qihq9jhqnfv003cr704v363va72zl6qaw2algj1c85cva45";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -24,9 +24,6 @@ stdenv.mkDerivation rec {
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
-  ] ++ lib.optionals (stdenv.isDarwin) [
-    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
-    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.parsed.cpu.name}"
   ] ++ lib.optionals (useLLVM || bareMetal || isMusl) [
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
     "-DCOMPILER_RT_BUILD_XRAY=OFF"
@@ -44,15 +41,23 @@ stdenv.mkDerivation rec {
     "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
   ] ++ lib.optionals (bareMetal) [
     "-DCOMPILER_RT_OS_DIR=baremetal"
+  ] ++ lib.optionals (stdenv.hostPlatform.isDarwin) [
+    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
+    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.darwinArch}"
+    "-DDARWIN_osx_BUILTIN_ARCHS=${stdenv.hostPlatform.darwinArch}"
   ];
 
   outputs = [ "out" "dev" ];
 
   patches = [
-    ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
-    ./compiler-rt-X86-support-extension.patch # Add support for i486 i586 i686 by reusing i386 config
+    ./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
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
-    ++ lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
+    ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..5f025764de1
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,129 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index b44ad2c2118e..d42f5664d448 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,7 @@ cmake_minimum_required(VERSION 3.13.4)
+ # 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)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 361538a58e47..f0d8d9ab80f1 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -495,7 +495,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -512,7 +512,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index 456a8dcda59f..7a09e74c7c79 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -508,7 +508,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index f61d487e93a0..f1f46fb9599c 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -378,7 +378,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${target} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index 1edab43e7c0d..1aac6b73ff82 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -65,11 +65,11 @@ 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 ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -97,7 +97,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index b00e8caa1ddd..0fe64e4862c9 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -69,22 +69,22 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install fuzzer headers.
+ install(FILES ${FUZZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/fuzzer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/fuzzer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ # Install profile headers.
+ install(FILES ${PROFILE_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/profile)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/profile)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index a29de8deff1b..d39ff01613d2 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -57,4 +57,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch b/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch
new file mode 100644
index 00000000000..135cf625ef7
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch
@@ -0,0 +1,16 @@
+diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+index f1f46fb9599c..6f19e69507ba 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -302,8 +302,9 @@ macro(load_llvm_config)
+     # Get some LLVM variables from LLVMConfig.
+     include("${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
+ 
+-    set(LLVM_LIBRARY_OUTPUT_INTDIR
+-      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
++    get_filename_component(LLVM_LIBRARY_OUTPUT_INTDIR
++      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX}
++      REALPATH)
+   endif()
+ endmacro()
+ 
diff --git a/pkgs/development/compilers/llvm/12/default.nix b/pkgs/development/compilers/llvm/12/default.nix
index a6d68d2e2a4..ea054107e05 100644
--- a/pkgs/development/compilers/llvm/12/default.nix
+++ b/pkgs/development/compilers/llvm/12/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , darwin
@@ -27,34 +26,41 @@ let
   };
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
+      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
+    '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
-      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
 
   in {
 
-    llvm = callPackage ./llvm {
+    libllvm = callPackage ./llvm {
       inherit llvm_meta;
     };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src llvm_meta;
     };
 
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     # disabled until recommonmark supports sphinx 3
-    #Llvm-manpages = lowPrio (tools.llvm.override {
+    #Llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
@@ -65,8 +71,6 @@ let
     #   python3 = pkgs.python3;  # don't use python-boot
     # });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -164,7 +168,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -174,7 +178,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/12/libcxxabi/default.nix b/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
index dab6c583e88..7c974262438 100644
--- a/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
+++ b/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation {
   '' + lib.optionalString stdenv.hostPlatform.isMusl ''
     patch -p1 -d libcxx -i ${../../libcxx-0001-musl-hacks.patch}
   '' + lib.optionalString stdenv.hostPlatform.isWasm ''
-    patch -p1 -d llvm -i ${./libcxxabi-wasm.patch}
+    patch -p1 -d llvm -i ${./wasm.patch}
   '';
 
   installPhase = if stdenv.isDarwin
diff --git a/pkgs/development/compilers/llvm/12/libcxxabi/libcxxabi-wasm.patch b/pkgs/development/compilers/llvm/12/libcxxabi/wasm.patch
index 4ebfe46aa81..4ebfe46aa81 100644
--- a/pkgs/development/compilers/llvm/12/libcxxabi/libcxxabi-wasm.patch
+++ b/pkgs/development/compilers/llvm/12/libcxxabi/wasm.patch
diff --git a/pkgs/development/compilers/llvm/12/libunwind/default.nix b/pkgs/development/compilers/llvm/12/libunwind/default.nix
index 8b75146d7b2..abfe950614a 100644
--- a/pkgs/development/compilers/llvm/12/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/12/libunwind/default.nix
@@ -15,6 +15,12 @@ stdenv.mkDerivation rec {
     mv llvm-* llvm
   '';
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
diff --git a/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..a791d6c4323
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 48cb8e004e08..fec8144fb95a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -23,6 +23,8 @@ set(LIBUNWIND_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
+   project(libunwind LANGUAGES C CXX ASM)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libunwind)
+   set(PACKAGE_VERSION 12.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -115,17 +117,17 @@ 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}/c++)
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ else()
+   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
diff --git a/pkgs/development/compilers/llvm/12/lld/default.nix b/pkgs/development/compilers/llvm/12/lld/default.nix
index 18b72a90407..d46f25b68b3 100644
--- a/pkgs/development/compilers/llvm/12/lld/default.nix
+++ b/pkgs/development/compilers/llvm/12/lld/default.nix
@@ -1,9 +1,10 @@
 { lib, stdenv, llvm_meta
+, buildLlvmTools
 , fetch
 , libunwind
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -13,8 +14,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "1zakyxk5bwnh7jarckcd4rbmzi58jgn2dbah5j5cwcyfyfbx9drc";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  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) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
   postPatch = ''
     substituteInPlace MachO/CMakeLists.txt --replace \
@@ -23,13 +36,6 @@ stdenv.mkDerivation rec {
     tar -xf "${libunwind.src}" --wildcards -C libunwind/include --strip-components=2 "libunwind-*/include/"
   '';
 
-  outputs = [ "out" "dev" ];
-
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
-
   meta = llvm_meta // {
     homepage = "https://lld.llvm.org/";
     description = "The LLVM linker";
diff --git a/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..61e2f0e4865
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+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
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ 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 ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${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 ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${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/12/lldb/default.nix b/pkgs/development/compilers/llvm/12/lldb/default.nix
index 1fce82d7990..07517308b46 100644
--- a/pkgs/development/compilers/llvm/12/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/12/lldb/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv, llvm_meta
+, runCommand
 , fetch
 , cmake
 , zlib
@@ -7,8 +8,8 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , libobjc
@@ -27,17 +28,30 @@ stdenv.mkDerivation (rec {
 
   src = fetch pname "1v85qyq3snk81vjmwq5q7xikyyqsfpqy2c4qmr81mps4avsw1g0l";
 
-  patches = [ ./lldb-procfs.patch ];
+  patches = [
+    ./procfs.patch
+    (runCommand "resource-dir.patch" {
+      clangLibDir = "${libclang.lib}/lib";
+    } ''
+      substitute '${./resource-dir.patch}' "$out" --subst-var clangLibDir
+    '')
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
-  nativeBuildInputs = [ cmake python3 which swig lit ]
-    ++ lib.optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
+  nativeBuildInputs = [
+    cmake python3 which swig lit
+  ] ++ lib.optionals enableManpages [
+    python3.pkgs.sphinx python3.pkgs.recommonmark
+  ];
 
   buildInputs = [
     ncurses
     zlib
     libedit
     libxml2
-    llvm
+    libllvm
   ]
   ++ lib.optionals stdenv.isDarwin [
     libobjc
@@ -51,8 +65,9 @@ stdenv.mkDerivation (rec {
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLVM_ENABLE_RTTI=OFF"
-    "-DClang_DIR=${clang-unwrapped}/lib/cmake"
+    "-DClang_DIR=${libclang.dev}/lib/cmake"
     "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
   ] ++ lib.optionals stdenv.isDarwin [
     "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON"
@@ -62,8 +77,13 @@ stdenv.mkDerivation (rec {
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
     "-DSPHINX_OUTPUT_HTML=OFF"
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     # Editor support
     # vscode:
@@ -90,6 +110,7 @@ stdenv.mkDerivation (rec {
   '';
 
   propagatedBuildInputs = [];
+
   # manually install lldb man page
   installPhase = ''
     mkdir -p $out/share/man/man1
diff --git a/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..98321f4479e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch
@@ -0,0 +1,65 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index b5633e21c56a..f2f1035e9238 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -10,6 +10,8 @@ set(CMAKE_MODULE_PATH
+ # If we are not building as part of LLVM, build LLDB as a standalone project,
+ # using LLVM as an external library.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
++  include(GNUInstallDirs)
++
+   project(lldb)
+   include(LLDBStandalone)
+ 
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 4ed5c647c5d2..89f96e710d55 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -107,13 +107,13 @@ function(add_lldb_library name)
+   endif()
+ 
+   if(PARAM_SHARED)
+-    set(install_dest lib${LLVM_LIBDIR_SUFFIX})
++    set(install_dest ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+     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 ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".cmake" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index 734167e51bc5..f95761b5df58 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -65,4 +65,4 @@ if (LLDB_ENABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/12/lldb/lldb-procfs.patch b/pkgs/development/compilers/llvm/12/lldb/procfs.patch
index b075dbaeee0..b075dbaeee0 100644
--- a/pkgs/development/compilers/llvm/12/lldb/lldb-procfs.patch
+++ b/pkgs/development/compilers/llvm/12/lldb/procfs.patch
diff --git a/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch b/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch
new file mode 100644
index 00000000000..e0db80afeb9
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch
@@ -0,0 +1,13 @@
+diff --git a/lldb/cmake/modules/LLDBConfig.cmake b/lldb/cmake/modules/LLDBConfig.cmake
+index 37364341ff8b..7f74c1a3e257 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -257,7 +257,7 @@ if (NOT TARGET clang-resource-headers)
+   # Iterate over the possible places where the external resource directory
+   # could be and pick the first that exists.
+   foreach(CANDIDATE "${Clang_DIR}/../.." "${LLVM_DIR}" "${LLVM_LIBRARY_DIRS}"
+-                    "${LLVM_BUILD_LIBRARY_DIR}"
++                    "${LLVM_BUILD_LIBRARY_DIR}" "@clangLibDir@"
+                     "${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}")
+     # Build the resource directory path by appending 'clang/<version number>'.
+     set(CANDIDATE_RESOURCE_DIR "${CANDIDATE}/clang/${LLDB_CLANG_RESOURCE_DIR_NAME}")
diff --git a/pkgs/development/compilers/llvm/12/llvm/default.nix b/pkgs/development/compilers/llvm/12/llvm/default.nix
index 33bb7b931f1..0bc704a8155 100644
--- a/pkgs/development/compilers/llvm/12/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/12/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv, llvm_meta
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -10,10 +11,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -44,8 +45,7 @@ in stdenv.mkDerivation (rec {
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -59,17 +59,18 @@ in stdenv.mkDerivation (rec {
     # Force a test to evaluate the saved benchmark for a CPU for which LLVM has
     # an execution model. See NixOS/nixpkgs#119673.
     ../../exegesis-force-bdver2.patch
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
-    substitute '${./llvm-outputs.patch}' ./llvm-outputs.patch --subst-var lib
-    patch -p1 < ./llvm-outputs.patch
+    substitute '${./outputs.patch}' ./outputs.patch --subst-var lib
+    patch -p1 < ./outputs.patch
   '' + ''
     # FileSystem permissions tests fail with various special bits
     substituteInPlace unittests/Support/CMakeLists.txt \
@@ -108,6 +109,7 @@ in stdenv.mkDerivation (rec {
   LDFLAGS = optionalString (enableSharedLibraries && !stdenv.isDarwin) "-Wl,--build-id=sha1";
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -131,11 +133,24 @@ in stdenv.mkDerivation (rec {
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_12}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
-    rm -R $out
+    rm -fR $out
   '';
 
   preCheck = ''
@@ -145,20 +160,19 @@ in stdenv.mkDerivation (rec {
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-  ''
-  + optionalString (enableSharedLibraries && (!stdenv.isDarwin)) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32) && (!stdenv.hostPlatform.isMusl);
diff --git a/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..68f3c45396f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,105 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index ca7c04c565bb..6ed5db5dd4f8 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ 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)
+   # 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(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 7cc129ba2e90..137be25e4b80 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 518a09b45a42..bd9d6f5542ad 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   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
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -275,7 +275,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..da8dc144517
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch
@@ -0,0 +1,417 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 277d0fe54d7b..af69c8be8745 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -256,15 +256,21 @@ 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 "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # 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${LLVM_LIBDIR_SUFFIX})
+@@ -567,9 +573,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${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
+@@ -1027,7 +1033,7 @@ 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"
+@@ -1038,7 +1044,7 @@ 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"
+@@ -1052,13 +1058,13 @@ 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 97c9980c7de3..409e8b615f75 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -804,9 +804,9 @@ macro(add_llvm_library name)
+ 
+       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 ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -1022,7 +1022,7 @@ function(process_llvm_pass_plugins)
+           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+       install(FILES
+           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
++          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
+           COMPONENT cmake-exports)
+ 
+       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
+@@ -1242,7 +1242,7 @@ 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)
+@@ -1854,7 +1854,7 @@ 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_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1871,7 +1871,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1894,7 +1894,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1977,7 +1977,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -2100,9 +2101,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 554046b20edf..4d1ad980641e 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   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 ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 505dc9a29d70..36e6c63af3f4 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${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.
+@@ -107,13 +107,13 @@ 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)
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index bb821b417ad9..6a528f7c2ad3 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -550,8 +550,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -582,13 +582,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -786,9 +806,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<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
++++ b/include/llvm/CMakeLists.txt
+@@ -5,5 +5,5 @@ add_subdirectory(Frontend)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  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
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +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_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
+--- 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());
+-    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(StringRef(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 2963f97cad88..69d66c9c9ca1 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -25,7 +25,7 @@ add_llvm_library(LTO SHARED 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/12/llvm/llvm-outputs.patch b/pkgs/development/compilers/llvm/12/llvm/outputs.patch
index 40096fa3497..40096fa3497 100644
--- a/pkgs/development/compilers/llvm/12/llvm/llvm-outputs.patch
+++ b/pkgs/development/compilers/llvm/12/llvm/outputs.patch