Merge remote-tracking branch 'nixpkgs/master' into master

60 files changed, 457 insertions, 95 deletions

diff --git a/pkgs/development/compilers/llvm/10/clang/default.nix b/pkgs/development/compilers/llvm/10/clang/default.nix
index 51c0cd9ccc3..10026ca4eb1 100644
--- a/pkgs/development/compilers/llvm/10/clang/default.nix
+++ b/pkgs/development/compilers/llvm/10/clang/default.nix
@@ -95,7 +95,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/10/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/10/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..120cfe6feb2
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/compiler-rt-armv7l.patch
@@ -0,0 +1,32 @@
+diff -ur compiler-rt-10.0.0.src/cmake/builtin-config-ix.cmake compiler-rt-10.0.0.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-10.0.0.src/cmake/builtin-config-ix.cmake	2020-03-24 00:01:02.000000000 +0900
++++ compiler-rt-10.0.0.src-patched/cmake/builtin-config-ix.cmake	2020-05-10 03:42:00.883450706 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(HEXAGON hexagon)
+ set(X86 i386)
+ set(X86_64 x86_64)
+diff -ur compiler-rt-10.0.0.src/lib/builtins/CMakeLists.txt compiler-rt-10.0.0.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-10.0.0.src/lib/builtins/CMakeLists.txt	2020-03-24 00:01:02.000000000 +0900
++++ compiler-rt-10.0.0.src-patched/lib/builtins/CMakeLists.txt	2020-05-10 03:44:49.468579650 +0900
+@@ -474,6 +474,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
+@@ -595,7 +596,7 @@
+   foreach (arch ${BUILTIN_SUPPORTED_ARCH})
+     if (CAN_TARGET_${arch})
+       # For ARM archs, exclude any VFP builtins if VFP is not supported
+-      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         string(REPLACE ";" " " _TARGET_${arch}_CFLAGS "${TARGET_${arch}_CFLAGS}")
+         check_compile_definition(__VFP_FP__ "${CMAKE_C_FLAGS} ${_TARGET_${arch}_CFLAGS}" COMPILER_RT_HAS_${arch}_VFP)
+         if(NOT COMPILER_RT_HAS_${arch}_VFP)
diff --git a/pkgs/development/compilers/llvm/10/compiler-rt.nix b/pkgs/development/compilers/llvm/10/compiler-rt.nix
index 02bbc17c967..68f64ef4256 100644
--- a/pkgs/development/compilers/llvm/10/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/10/compiler-rt.nix
@@ -1,4 +1,13 @@
 { stdenv, version, fetch, cmake, python3, llvm, libcxxabi }:
+
+let
+
+  useLLVM = stdenv.hostPlatform.useLLVM or false;
+  bareMetal = stdenv.hostPlatform.parsed.kernel.name == "none";
+  inherit (stdenv.hostPlatform) isMusl;
+
+in
+
 stdenv.mkDerivation rec {
   pname = "compiler-rt";
   inherit version;
@@ -11,27 +20,26 @@ stdenv.mkDerivation rec {
     "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
   ];
 
-  cmakeFlags = stdenv.lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
-    "-DCMAKE_C_FLAGS=-nodefaultlibs"
-    "-DCMAKE_CXX_COMPILER_WORKS=ON"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal || isMusl) [
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
     "-DCOMPILER_RT_BUILD_XRAY=OFF"
     "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
     "-DCOMPILER_RT_BUILD_PROFILE=OFF"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal) [
+    "-DCMAKE_C_COMPILER_WORKS=ON"
+    "-DCMAKE_CXX_COMPILER_WORKS=ON"
     "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
+    "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
+  ] ++ stdenv.lib.optionals (useLLVM) [
+    "-DCOMPILER_RT_BUILD_BUILTINS=ON"
+    "-DCMAKE_C_FLAGS=-nodefaultlibs"
     #https://stackoverflow.com/questions/53633705/cmake-the-c-compiler-is-not-able-to-compile-a-simple-test-program
     "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
-    "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
-  ] ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [
-    "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
-    "-DCOMPILER_RT_BUILD_XRAY=OFF"
-    "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
-    "-DCOMPILER_RT_BUILD_PROFILE=OFF"
-  ] ++ stdenv.lib.optionals (stdenv.hostPlatform.parsed.kernel.name == "none") [
-    "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
+  ] ++ stdenv.lib.optionals (bareMetal) [
     "-DCOMPILER_RT_OS_DIR=baremetal"
   ];
 
@@ -40,17 +48,22 @@ stdenv.mkDerivation rec {
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     ./find-darwin-sdk-version.patch # don't test for macOS being >= 10.15
-  ];# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+  ]# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
+
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = ''
+    substituteInPlace cmake/builtin-config-ix.cmake \
+      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
-  '' + stdenv.lib.optionalString (stdenv.hostPlatform.useLLVM or false) ''
+  '' + stdenv.lib.optionalString (useLLVM) ''
     substituteInPlace lib/builtins/int_util.c \
       --replace "#include <stdlib.h>" ""
     substituteInPlace lib/builtins/clear_cache.c \
@@ -62,7 +75,7 @@ stdenv.mkDerivation rec {
   # Hack around weird upsream RPATH bug
   postInstall = stdenv.lib.optionalString (stdenv.hostPlatform.isDarwin || stdenv.hostPlatform.isWasm) ''
     ln -s "$out/lib"/*/* "$out/lib"
-  '' + stdenv.lib.optionalString (stdenv.hostPlatform.useLLVM or false) ''
+  '' + stdenv.lib.optionalString (useLLVM) ''
     ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/crtbegin.o
     ln -s $out/lib/*/clang_rt.crtend-*.o $out/lib/crtend.o
     ln -s $out/lib/*/clang_rt.crtbegin_shared-*.o $out/lib/crtbeginS.o
diff --git a/pkgs/development/compilers/llvm/10/default.nix b/pkgs/development/compilers/llvm/10/default.nix
index 462f246b89d..4181ab29bd7 100644
--- a/pkgs/development/compilers/llvm/10/default.nix
+++ b/pkgs/development/compilers/llvm/10/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "10.0.0";
   version = release_version; # differentiating these (variables) is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${release_version}/${name}-${version}.src.tar.xz";
@@ -60,7 +61,12 @@ let
         libstdcxxHook
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/10/libc++/default.nix b/pkgs/development/compilers/llvm/10/libc++/default.nix
index f7064bdc452..ed76ce77a8b 100644
--- a/pkgs/development/compilers/llvm/10/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/10/libc++/default.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/10/libc++abi.nix b/pkgs/development/compilers/llvm/10/libc++abi.nix
index b3b90687a2a..ab45f27d24f 100644
--- a/pkgs/development/compilers/llvm/10/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/10/libc++abi.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -58,7 +58,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/10/lld.nix b/pkgs/development/compilers/llvm/10/lld.nix
index 8c66697c67e..6a0032de2ac 100644
--- a/pkgs/development/compilers/llvm/10/lld.nix
+++ b/pkgs/development/compilers/llvm/10/lld.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/10/lldb.nix b/pkgs/development/compilers/llvm/10/lldb.nix
index a4816a635e4..90716f67f83 100644
--- a/pkgs/development/compilers/llvm/10/lldb.nix
+++ b/pkgs/development/compilers/llvm/10/lldb.nix
@@ -71,7 +71,7 @@ stdenv.mkDerivation (rec {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage = "http://lldb.llvm.org";
+    homepage = "https://lldb.llvm.org";
     license = licenses.ncsa;
     platforms = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/10/llvm.nix b/pkgs/development/compilers/llvm/10/llvm.nix
index f36f58d8203..dd0728b40c9 100644
--- a/pkgs/development/compilers/llvm/10/llvm.nix
+++ b/pkgs/development/compilers/llvm/10/llvm.nix
@@ -16,6 +16,7 @@
 , enableSharedLibraries ? true
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+  || stdenv.isAarch32 # broken for the armv7l builder
 )
 , enablePolly ? true
 }:
@@ -159,9 +160,10 @@ in stdenv.mkDerivation (rec {
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/10/openmp.nix b/pkgs/development/compilers/llvm/10/openmp.nix
index 940f53f4cf7..624c99bc868 100644
--- a/pkgs/development/compilers/llvm/10/openmp.nix
+++ b/pkgs/development/compilers/llvm/10/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/5/clang/default.nix b/pkgs/development/compilers/llvm/5/clang/default.nix
index 0317271f003..1016398992f 100644
--- a/pkgs/development/compilers/llvm/5/clang/default.nix
+++ b/pkgs/development/compilers/llvm/5/clang/default.nix
@@ -83,7 +83,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/5/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/5/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..77bf2640c47
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/compiler-rt-armv7l.patch
@@ -0,0 +1,23 @@
+diff -ur compiler-rt-5.0.2.src/cmake/builtin-config-ix.cmake compiler-rt-5.0.2.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-5.0.2.src/cmake/builtin-config-ix.cmake	2017-05-25 00:53:24.000000000 +0900
++++ compiler-rt-5.0.2.src-patched/cmake/builtin-config-ix.cmake	2020-05-10 03:24:24.937433155 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(X86 i386 i686)
+ set(X86_64 x86_64)
+ set(MIPS32 mips mipsel)
+diff -ur compiler-rt-5.0.2.src/lib/builtins/CMakeLists.txt compiler-rt-5.0.2.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-5.0.2.src/lib/builtins/CMakeLists.txt	2017-07-13 04:33:30.000000000 +0900
++++ compiler-rt-5.0.2.src-patched/lib/builtins/CMakeLists.txt	2020-05-10 03:24:45.945075423 +0900
+@@ -444,6 +444,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
diff --git a/pkgs/development/compilers/llvm/5/compiler-rt.nix b/pkgs/development/compilers/llvm/5/compiler-rt.nix
index 4740180eb29..624034b5228 100644
--- a/pkgs/development/compilers/llvm/5/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/5/compiler-rt.nix
@@ -1,5 +1,13 @@
 { stdenv, version, fetch, cmake, python3, llvm, libcxxabi }:
-with stdenv.lib;
+
+let
+
+  useLLVM = stdenv.hostPlatform.useLLVM or false;
+  bareMetal = stdenv.hostPlatform.parsed.kernel.name == "none";
+  inherit (stdenv.hostPlatform) isMusl;
+
+in
+
 stdenv.mkDerivation {
   pname = "compiler-rt";
   inherit version;
@@ -8,16 +16,40 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake python3 llvm ];
   buildInputs = stdenv.lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
-  configureFlags = [
+  NIX_CFLAGS_COMPILE = [
+    "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
+  ];
+
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
+    "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
+    "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal || isMusl) [
+    "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
+    "-DCOMPILER_RT_BUILD_XRAY=OFF"
+    "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
+    "-DCOMPILER_RT_BUILD_PROFILE=OFF"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal) [
+    "-DCMAKE_C_COMPILER_WORKS=ON"
+    "-DCMAKE_CXX_COMPILER_WORKS=ON"
+    "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
+    "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
+  ] ++ stdenv.lib.optionals (useLLVM) [
+    "-DCOMPILER_RT_BUILD_BUILTINS=ON"
+    "-DCMAKE_C_FLAGS=-nodefaultlibs"
+    #https://stackoverflow.com/questions/53633705/cmake-the-c-compiler-is-not-able-to-compile-a-simple-test-program
+    "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
+  ] ++ stdenv.lib.optionals (bareMetal) [
+    "-DCOMPILER_RT_OS_DIR=baremetal"
   ];
 
   outputs = [ "out" "dev" ];
 
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
-  ] ++ optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
-    ++ optional (stdenv.hostPlatform.libc == "glibc") ./compiler-rt-sys-ustat.patch;
+  ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+    ++ stdenv.lib.optional (stdenv.hostPlatform.libc == "glibc") ./compiler-rt-sys-ustat.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
@@ -27,11 +59,23 @@ stdenv.mkDerivation {
   postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
+  '' + stdenv.lib.optionalString (useLLVM) ''
+    substituteInPlace lib/builtins/int_util.c \
+      --replace "#include <stdlib.h>" ""
+    substituteInPlace lib/builtins/clear_cache.c \
+      --replace "#include <assert.h>" ""
+    substituteInPlace lib/builtins/cpu_model.c \
+      --replace "#include <assert.h>" ""
   '';
 
   # Hack around weird upsream RPATH bug
-  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+  postInstall = stdenv.lib.optionalString (stdenv.hostPlatform.isDarwin || stdenv.hostPlatform.isWasm) ''
     ln -s "$out/lib"/*/* "$out/lib"
+  '' + stdenv.lib.optionalString (useLLVM) ''
+    ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/linux/crtbegin.o
+    ln -s $out/lib/*/clang_rt.crtend-*.o $out/lib/linux/crtend.o
+    ln -s $out/lib/*/clang_rt.crtbegin_shared-*.o $out/lib/linux/crtbeginS.o
+    ln -s $out/lib/*/clang_rt.crtend_shared-*.o $out/lib/linux/crtendS.o
   '';
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/compilers/llvm/5/default.nix b/pkgs/development/compilers/llvm/5/default.nix
index 3c1b07e7ca7..e7083a6ed13 100644
--- a/pkgs/development/compilers/llvm/5/default.nix
+++ b/pkgs/development/compilers/llvm/5/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "5.0.2";
   version = release_version; # differentiating these is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
@@ -56,7 +57,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/5/libc++/default.nix b/pkgs/development/compilers/llvm/5/libc++/default.nix
index 5bd3cde2329..88ad3c29c3e 100644
--- a/pkgs/development/compilers/llvm/5/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/5/libc++/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.unix;
diff --git a/pkgs/development/compilers/llvm/5/libc++abi.nix b/pkgs/development/compilers/llvm/5/libc++abi.nix
index e3ffc473c34..96d6e78e01e 100644
--- a/pkgs/development/compilers/llvm/5/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/5/libc++abi.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -42,7 +42,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/5/lld.nix b/pkgs/development/compilers/llvm/5/lld.nix
index 7ab02c1d35c..3d9ed6ee663 100644
--- a/pkgs/development/compilers/llvm/5/lld.nix
+++ b/pkgs/development/compilers/llvm/5/lld.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
     badPlatforms = [ "x86_64-darwin" ];
diff --git a/pkgs/development/compilers/llvm/5/lldb.nix b/pkgs/development/compilers/llvm/5/lldb.nix
index 4a0d678cc2a..e0698e1dcf3 100644
--- a/pkgs/development/compilers/llvm/5/lldb.nix
+++ b/pkgs/development/compilers/llvm/5/lldb.nix
@@ -50,7 +50,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = licenses.ncsa;
     platforms   = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/5/llvm.nix b/pkgs/development/compilers/llvm/5/llvm.nix
index 1bf86115bc2..987e6258527 100644
--- a/pkgs/development/compilers/llvm/5/llvm.nix
+++ b/pkgs/development/compilers/llvm/5/llvm.nix
@@ -151,7 +151,7 @@ stdenv.mkDerivation ({
   requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/5/openmp.nix b/pkgs/development/compilers/llvm/5/openmp.nix
index 34e6bc64bfd..da328de24d1 100644
--- a/pkgs/development/compilers/llvm/5/openmp.nix
+++ b/pkgs/development/compilers/llvm/5/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/6/clang/default.nix b/pkgs/development/compilers/llvm/6/clang/default.nix
index 7139e15d1dc..e2f7166354a 100644
--- a/pkgs/development/compilers/llvm/6/clang/default.nix
+++ b/pkgs/development/compilers/llvm/6/clang/default.nix
@@ -83,7 +83,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/6/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/6/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..ca2ed632faa
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/compiler-rt-armv7l.patch
@@ -0,0 +1,32 @@
+diff -ur compiler-rt-6.0.1.src/cmake/builtin-config-ix.cmake compiler-rt-6.0.1.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-6.0.1.src/cmake/builtin-config-ix.cmake	2017-12-01 06:04:11.000000000 +0900
++++ compiler-rt-6.0.1.src-patched/cmake/builtin-config-ix.cmake	2020-05-10 03:30:01.939694303 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(X86 i386)
+ set(X86_64 x86_64)
+ set(MIPS32 mips mipsel)
+diff -ur compiler-rt-6.0.1.src/lib/builtins/CMakeLists.txt compiler-rt-6.0.1.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-6.0.1.src/lib/builtins/CMakeLists.txt	2017-12-25 06:11:32.000000000 +0900
++++ compiler-rt-6.0.1.src-patched/lib/builtins/CMakeLists.txt	2020-05-10 03:30:44.814964156 +0900
+@@ -452,6 +452,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
+@@ -521,7 +522,7 @@
+       set(_arch ${arch})
+       if("${arch}" STREQUAL "armv6m")
+         set(_arch "arm|armv6m")
+-      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         set(_arch "arm")
+       endif()
+ 
diff --git a/pkgs/development/compilers/llvm/6/compiler-rt.nix b/pkgs/development/compilers/llvm/6/compiler-rt.nix
index b3b6e86fc52..5ae8bb01f05 100644
--- a/pkgs/development/compilers/llvm/6/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/6/compiler-rt.nix
@@ -1,5 +1,13 @@
 { stdenv, version, fetch, cmake, python3, llvm, libcxxabi }:
-with stdenv.lib;
+
+let
+
+  useLLVM = stdenv.hostPlatform.useLLVM or false;
+  bareMetal = stdenv.hostPlatform.parsed.kernel.name == "none";
+  inherit (stdenv.hostPlatform) isMusl;
+
+in
+
 stdenv.mkDerivation {
   pname = "compiler-rt";
   inherit version;
@@ -8,29 +16,68 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake python3 llvm ];
   buildInputs = stdenv.lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
-  configureFlags = [
+  NIX_CFLAGS_COMPILE = [
+    "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
+  ];
+
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
+    "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
+    "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal || isMusl) [
+    "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
+    "-DCOMPILER_RT_BUILD_XRAY=OFF"
+    "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
+    "-DCOMPILER_RT_BUILD_PROFILE=OFF"
+  ] ++ stdenv.lib.optionals (useLLVM || bareMetal) [
+    "-DCMAKE_C_COMPILER_WORKS=ON"
+    "-DCMAKE_CXX_COMPILER_WORKS=ON"
+    "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
+    "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
+  ] ++ stdenv.lib.optionals (useLLVM) [
+    "-DCOMPILER_RT_BUILD_BUILTINS=ON"
+    "-DCMAKE_C_FLAGS=-nodefaultlibs"
+    #https://stackoverflow.com/questions/53633705/cmake-the-c-compiler-is-not-able-to-compile-a-simple-test-program
+    "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
+  ] ++ stdenv.lib.optionals (bareMetal) [
+    "-DCOMPILER_RT_OS_DIR=baremetal"
   ];
 
   outputs = [ "out" "dev" ];
 
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
-  ] ++ optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch;
+  ] ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = ''
+    substituteInPlace cmake/builtin-config-ix.cmake \
+      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
+  '' + stdenv.lib.optionalString (useLLVM) ''
+    substituteInPlace lib/builtins/int_util.c \
+      --replace "#include <stdlib.h>" ""
+    substituteInPlace lib/builtins/clear_cache.c \
+      --replace "#include <assert.h>" ""
+    substituteInPlace lib/builtins/cpu_model.c \
+      --replace "#include <assert.h>" ""
   '';
 
   # Hack around weird upsream RPATH bug
-  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+  postInstall = stdenv.lib.optionalString (stdenv.hostPlatform.isDarwin || stdenv.hostPlatform.isWasm) ''
     ln -s "$out/lib"/*/* "$out/lib"
+  '' + stdenv.lib.optionalString (useLLVM) ''
+    ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/linux/crtbegin.o
+    ln -s $out/lib/*/clang_rt.crtend-*.o $out/lib/linux/crtend.o
+    ln -s $out/lib/*/clang_rt.crtbegin_shared-*.o $out/lib/linux/crtbeginS.o
+    ln -s $out/lib/*/clang_rt.crtend_shared-*.o $out/lib/linux/crtendS.o
   '';
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/compilers/llvm/6/default.nix b/pkgs/development/compilers/llvm/6/default.nix
index ba704f972c3..b544a4f6ba6 100644
--- a/pkgs/development/compilers/llvm/6/default.nix
+++ b/pkgs/development/compilers/llvm/6/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "6.0.1";
   version = release_version; # differentiating these is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
@@ -56,7 +57,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/6/libc++/default.nix b/pkgs/development/compilers/llvm/6/libc++/default.nix
index 40f91c4d6ae..57f1431f471 100644
--- a/pkgs/development/compilers/llvm/6/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/6/libc++/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.unix;
diff --git a/pkgs/development/compilers/llvm/6/libc++abi.nix b/pkgs/development/compilers/llvm/6/libc++abi.nix
index f8d0d2e0cee..246bc6153e5 100644
--- a/pkgs/development/compilers/llvm/6/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/6/libc++abi.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -42,7 +42,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/6/lld.nix b/pkgs/development/compilers/llvm/6/lld.nix
index e00b71bc33e..81b94df3119 100644
--- a/pkgs/development/compilers/llvm/6/lld.nix
+++ b/pkgs/development/compilers/llvm/6/lld.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/6/lldb.nix b/pkgs/development/compilers/llvm/6/lldb.nix
index 0445dfed47f..80e298eaf8c 100644
--- a/pkgs/development/compilers/llvm/6/lldb.nix
+++ b/pkgs/development/compilers/llvm/6/lldb.nix
@@ -50,7 +50,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = licenses.ncsa;
     platforms   = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/6/llvm.nix b/pkgs/development/compilers/llvm/6/llvm.nix
index e1e40c8456d..22dbb75d2d5 100644
--- a/pkgs/development/compilers/llvm/6/llvm.nix
+++ b/pkgs/development/compilers/llvm/6/llvm.nix
@@ -147,9 +147,10 @@ stdenv.mkDerivation ({
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/6/openmp.nix b/pkgs/development/compilers/llvm/6/openmp.nix
index efc5553b1d6..c1a4480a552 100644
--- a/pkgs/development/compilers/llvm/6/openmp.nix
+++ b/pkgs/development/compilers/llvm/6/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/7/clang/default.nix b/pkgs/development/compilers/llvm/7/clang/default.nix
index 3a43b6b8aee..18ea46ea39c 100644
--- a/pkgs/development/compilers/llvm/7/clang/default.nix
+++ b/pkgs/development/compilers/llvm/7/clang/default.nix
@@ -93,7 +93,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/7/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/7/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..89d7f1aec91
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/compiler-rt-armv7l.patch
@@ -0,0 +1,38 @@
+diff -ur compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake	2018-05-25 06:36:27.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake	2020-05-09 20:26:33.030608692 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(HEXAGON hexagon)
+ set(X86 i386)
+ set(X86_64 x86_64)
+diff -ur compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt	2018-07-31 03:18:59.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt	2020-05-09 20:27:38.893409318 +0900
+@@ -453,6 +453,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
+@@ -563,12 +564,12 @@
+       set(_arch ${arch})
+       if("${arch}" STREQUAL "armv6m")
+         set(_arch "arm|armv6m")
+-      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         set(_arch "arm")
+       endif()
+ 
+       # For ARM archs, exclude any VFP builtins if VFP is not supported
+-      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         string(REPLACE ";" " " _TARGET_${arch}_CFLAGS "${TARGET_${arch}_CFLAGS}")
+         check_compile_definition(__VFP_FP__ "${CMAKE_C_FLAGS} ${_TARGET_${arch}_CFLAGS}" COMPILER_RT_HAS_${arch}_VFP)
+         if(NOT COMPILER_RT_HAS_${arch}_VFP)
diff --git a/pkgs/development/compilers/llvm/7/compiler-rt.nix b/pkgs/development/compilers/llvm/7/compiler-rt.nix
index 7a5e3d4c8fc..e9853c58ca5 100644
--- a/pkgs/development/compilers/llvm/7/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/7/compiler-rt.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
     "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
   ];
 
-  cmakeFlags = stdenv.lib.optionals (useLLVM || stdenv.isDarwin) [
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
@@ -48,14 +48,18 @@ stdenv.mkDerivation {
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
   ] ++ stdenv.lib.optional (useLLVM) ./crtbegin-and-end.patch
-    ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch;
+    ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = ''
+    substituteInPlace cmake/builtin-config-ix.cmake \
+      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
   '' + stdenv.lib.optionalString (useLLVM) ''
@@ -68,7 +72,7 @@ stdenv.mkDerivation {
   '';
 
   # Hack around weird upsream RPATH bug
-  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+  postInstall = stdenv.lib.optionalString (stdenv.hostPlatform.isDarwin || stdenv.hostPlatform.isWasm) ''
     ln -s "$out/lib"/*/* "$out/lib"
   '' + stdenv.lib.optionalString (useLLVM) ''
     ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/linux/crtbegin.o
diff --git a/pkgs/development/compilers/llvm/7/default.nix b/pkgs/development/compilers/llvm/7/default.nix
index 5124a5df00b..0b71c3a28d2 100644
--- a/pkgs/development/compilers/llvm/7/default.nix
+++ b/pkgs/development/compilers/llvm/7/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "7.1.0";
   version = release_version; # differentiating these is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://releases.llvm.org/${release_version}/${name}-${version}.src.tar.xz";
@@ -63,7 +64,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/7/libc++/default.nix b/pkgs/development/compilers/llvm/7/libc++/default.nix
index 7c2f1e238ba..96cb671fa43 100644
--- a/pkgs/development/compilers/llvm/7/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/7/libc++/default.nix
@@ -45,7 +45,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.unix;
diff --git a/pkgs/development/compilers/llvm/7/libc++abi.nix b/pkgs/development/compilers/llvm/7/libc++abi.nix
index 608351e0eb9..97141a0bd40 100644
--- a/pkgs/development/compilers/llvm/7/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/7/libc++abi.nix
@@ -28,7 +28,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -45,7 +45,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/7/lld.nix b/pkgs/development/compilers/llvm/7/lld.nix
index 3921e70b3e3..bee9202ed6c 100644
--- a/pkgs/development/compilers/llvm/7/lld.nix
+++ b/pkgs/development/compilers/llvm/7/lld.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/7/lldb.nix b/pkgs/development/compilers/llvm/7/lldb.nix
index 81ad0675839..8fadd3cf784 100644
--- a/pkgs/development/compilers/llvm/7/lldb.nix
+++ b/pkgs/development/compilers/llvm/7/lldb.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = licenses.ncsa;
     platforms   = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/7/llvm.nix b/pkgs/development/compilers/llvm/7/llvm.nix
index 0ea517e81f4..dc57d0d6bd5 100644
--- a/pkgs/development/compilers/llvm/7/llvm.nix
+++ b/pkgs/development/compilers/llvm/7/llvm.nix
@@ -17,6 +17,7 @@
 , enableSharedLibraries ? true
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+  || stdenv.isAarch32 # broken for the armv7l builder
   )
 , enablePolly ? false
 }:
@@ -168,9 +169,10 @@ in stdenv.mkDerivation ({
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/7/openmp.nix b/pkgs/development/compilers/llvm/7/openmp.nix
index 69ee58679c4..898d49dce83 100644
--- a/pkgs/development/compilers/llvm/7/openmp.nix
+++ b/pkgs/development/compilers/llvm/7/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/8/clang/default.nix b/pkgs/development/compilers/llvm/8/clang/default.nix
index e549713ceca..3b398628e56 100644
--- a/pkgs/development/compilers/llvm/8/clang/default.nix
+++ b/pkgs/development/compilers/llvm/8/clang/default.nix
@@ -103,7 +103,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/8/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/8/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..89d7f1aec91
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/compiler-rt-armv7l.patch
@@ -0,0 +1,38 @@
+diff -ur compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake	2018-05-25 06:36:27.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake	2020-05-09 20:26:33.030608692 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(HEXAGON hexagon)
+ set(X86 i386)
+ set(X86_64 x86_64)
+diff -ur compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt	2018-07-31 03:18:59.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt	2020-05-09 20:27:38.893409318 +0900
+@@ -453,6 +453,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
+@@ -563,12 +564,12 @@
+       set(_arch ${arch})
+       if("${arch}" STREQUAL "armv6m")
+         set(_arch "arm|armv6m")
+-      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         set(_arch "arm")
+       endif()
+ 
+       # For ARM archs, exclude any VFP builtins if VFP is not supported
+-      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         string(REPLACE ";" " " _TARGET_${arch}_CFLAGS "${TARGET_${arch}_CFLAGS}")
+         check_compile_definition(__VFP_FP__ "${CMAKE_C_FLAGS} ${_TARGET_${arch}_CFLAGS}" COMPILER_RT_HAS_${arch}_VFP)
+         if(NOT COMPILER_RT_HAS_${arch}_VFP)
diff --git a/pkgs/development/compilers/llvm/8/compiler-rt.nix b/pkgs/development/compilers/llvm/8/compiler-rt.nix
index 795c81f4219..1f58cb98e3d 100644
--- a/pkgs/development/compilers/llvm/8/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/8/compiler-rt.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
     "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
   ];
 
-  cmakeFlags = stdenv.lib.optionals (useLLVM || stdenv.isDarwin) [
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
@@ -48,14 +48,18 @@ stdenv.mkDerivation {
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
   ]# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
-    ++ stdenv.lib.optional (useLLVM) ./crtbegin-and-end.patch;
+    ++ stdenv.lib.optional (useLLVM) ./crtbegin-and-end.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = ''
+    substituteInPlace cmake/builtin-config-ix.cmake \
+      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
   '' + stdenv.lib.optionalString (useLLVM) ''
diff --git a/pkgs/development/compilers/llvm/8/default.nix b/pkgs/development/compilers/llvm/8/default.nix
index 105011595c8..d9383d042bb 100644
--- a/pkgs/development/compilers/llvm/8/default.nix
+++ b/pkgs/development/compilers/llvm/8/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "8.0.1";
   version = release_version; # differentiating these is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${release_version}/${name}-${version}.src.tar.xz";
@@ -63,7 +64,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/8/libc++/default.nix b/pkgs/development/compilers/llvm/8/libc++/default.nix
index 97293464645..24bca6aafcd 100644
--- a/pkgs/development/compilers/llvm/8/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/8/libc++/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/8/libc++abi.nix b/pkgs/development/compilers/llvm/8/libc++abi.nix
index d8c64f51ee0..590872aaab6 100644
--- a/pkgs/development/compilers/llvm/8/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/8/libc++abi.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -58,7 +58,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/8/lld.nix b/pkgs/development/compilers/llvm/8/lld.nix
index da5649ef5a2..ba9cf3c57d7 100644
--- a/pkgs/development/compilers/llvm/8/lld.nix
+++ b/pkgs/development/compilers/llvm/8/lld.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/8/lldb.nix b/pkgs/development/compilers/llvm/8/lldb.nix
index 5df6f760a07..298ce737fc7 100644
--- a/pkgs/development/compilers/llvm/8/lldb.nix
+++ b/pkgs/development/compilers/llvm/8/lldb.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = licenses.ncsa;
     platforms   = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/8/llvm.nix b/pkgs/development/compilers/llvm/8/llvm.nix
index 9bf835027ae..0f6179c2d31 100644
--- a/pkgs/development/compilers/llvm/8/llvm.nix
+++ b/pkgs/development/compilers/llvm/8/llvm.nix
@@ -16,6 +16,7 @@
 , enableSharedLibraries ? true
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+  || stdenv.isAarch32 # broken for the armv7l builder
 )
 , enablePolly ? false
 }:
@@ -143,9 +144,10 @@ in stdenv.mkDerivation ({
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/8/openmp.nix b/pkgs/development/compilers/llvm/8/openmp.nix
index 74ec8076e43..42cc7adf4f0 100644
--- a/pkgs/development/compilers/llvm/8/openmp.nix
+++ b/pkgs/development/compilers/llvm/8/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/9/clang/default.nix b/pkgs/development/compilers/llvm/9/clang/default.nix
index 51399ea4598..c938a01f897 100644
--- a/pkgs/development/compilers/llvm/9/clang/default.nix
+++ b/pkgs/development/compilers/llvm/9/clang/default.nix
@@ -98,7 +98,7 @@ let
 
     meta = {
       description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
-      homepage    = "http://llvm.org/";
+      homepage    = "https://llvm.org/";
       license     = stdenv.lib.licenses.ncsa;
       platforms   = stdenv.lib.platforms.all;
     };
diff --git a/pkgs/development/compilers/llvm/9/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/9/compiler-rt-armv7l.patch
new file mode 100644
index 00000000000..89d7f1aec91
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/compiler-rt-armv7l.patch
@@ -0,0 +1,38 @@
+diff -ur compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake
+--- compiler-rt-7.1.0.src/cmake/builtin-config-ix.cmake	2018-05-25 06:36:27.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/cmake/builtin-config-ix.cmake	2020-05-09 20:26:33.030608692 +0900
+@@ -24,7 +24,7 @@
+ 
+ 
+ set(ARM64 aarch64)
+-set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k)
++set(ARM32 arm armhf armv6m armv7m armv7em armv7 armv7s armv7k armv7l)
+ set(HEXAGON hexagon)
+ set(X86 i386)
+ set(X86_64 x86_64)
+diff -ur compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt
+--- compiler-rt-7.1.0.src/lib/builtins/CMakeLists.txt	2018-07-31 03:18:59.000000000 +0900
++++ compiler-rt-7.1.0.src-patched/lib/builtins/CMakeLists.txt	2020-05-09 20:27:38.893409318 +0900
+@@ -453,6 +453,7 @@
+ set(armv7_SOURCES ${arm_SOURCES})
+ set(armv7s_SOURCES ${arm_SOURCES})
+ set(armv7k_SOURCES ${arm_SOURCES})
++set(armv7l_SOURCES ${arm_SOURCES})
+ set(arm64_SOURCES ${aarch64_SOURCES})
+ 
+ # macho_embedded archs
+@@ -563,12 +564,12 @@
+       set(_arch ${arch})
+       if("${arch}" STREQUAL "armv6m")
+         set(_arch "arm|armv6m")
+-      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      elseif("${arch}" MATCHES "^(armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         set(_arch "arm")
+       endif()
+ 
+       # For ARM archs, exclude any VFP builtins if VFP is not supported
+-      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7m|armv7em)$")
++      if (${arch} MATCHES "^(arm|armhf|armv7|armv7s|armv7k|armv7l|armv7m|armv7em)$")
+         string(REPLACE ";" " " _TARGET_${arch}_CFLAGS "${TARGET_${arch}_CFLAGS}")
+         check_compile_definition(__VFP_FP__ "${CMAKE_C_FLAGS} ${_TARGET_${arch}_CFLAGS}" COMPILER_RT_HAS_${arch}_VFP)
+         if(NOT COMPILER_RT_HAS_${arch}_VFP)
diff --git a/pkgs/development/compilers/llvm/9/compiler-rt.nix b/pkgs/development/compilers/llvm/9/compiler-rt.nix
index 0cfd8d7c9e7..3b92264ad69 100644
--- a/pkgs/development/compilers/llvm/9/compiler-rt.nix
+++ b/pkgs/development/compilers/llvm/9/compiler-rt.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
   ];
 
-  cmakeFlags = stdenv.lib.optionals (useLLVM || stdenv.isDarwin) [
+  cmakeFlags = [
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
@@ -47,14 +47,18 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
-  ];# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+  ]# ++ stdenv.lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
+    ++ stdenv.lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
   # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
   # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
   # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
   # a flag and turn the flag off during the stdenv build.
-  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = ''
+    substituteInPlace cmake/builtin-config-ix.cmake \
+      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace cmake/config-ix.cmake \
       --replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
   '' + stdenv.lib.optionalString (useLLVM) ''
diff --git a/pkgs/development/compilers/llvm/9/default.nix b/pkgs/development/compilers/llvm/9/default.nix
index d42e5187c3c..3b6db967b6a 100644
--- a/pkgs/development/compilers/llvm/9/default.nix
+++ b/pkgs/development/compilers/llvm/9/default.nix
@@ -1,4 +1,4 @@
-{ lowPrio, newScope, pkgs, stdenv, cmake, libstdcxxHook
+{ lowPrio, newScope, pkgs, stdenv, cmake, gcc, libstdcxxHook
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -7,6 +7,7 @@
 let
   release_version = "9.0.1";
   version = release_version; # differentiating these is important for rc's
+  targetConfig = stdenv.targetPlatform.config;
 
   fetch = name: sha256: fetchurl {
     url = "https://github.com/llvm/llvm-project/releases/download/llvmorg-${release_version}/${name}-${version}.src.tar.xz";
@@ -63,7 +64,12 @@ let
       extraPackages = [
         targetLlvmLibraries.compiler-rt
       ];
-      extraBuildCommands = mkExtraBuildCommands cc;
+      extraBuildCommands = ''
+          echo "-target ${targetConfig}" >> $out/nix-support/cc-cflags
+          echo "-B${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-cflags
+          echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+          echo "-L${gcc.cc.lib}/${targetConfig}/lib" >> $out/nix-support/cc-ldflags
+      '' + mkExtraBuildCommands cc;
     };
 
     libcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/9/libc++/default.nix b/pkgs/development/compilers/llvm/9/libc++/default.nix
index 05aaa9fc8e5..f3081d1f269 100644
--- a/pkgs/development/compilers/llvm/9/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/9/libc++/default.nix
@@ -47,7 +47,7 @@ stdenv.mkDerivation {
   ];
 
   meta = {
-    homepage = "http://libcxx.llvm.org/";
+    homepage = "https://libcxx.llvm.org/";
     description = "A new implementation of the C++ standard library, targeting C++11";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     platforms = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/9/libc++abi.nix b/pkgs/development/compilers/llvm/9/libc++abi.nix
index 583a47da3ff..5b63560282c 100644
--- a/pkgs/development/compilers/llvm/9/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/9/libc++abi.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation {
         # this should be done in CMake, but having trouble figuring out
         # the magic combination of necessary CMake variables
         # if you fancy a try, take a look at
-        # http://www.cmake.org/Wiki/CMake_RPATH_handling
+        # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
         install_name_tool -id $out/$file $file
       done
       make install
@@ -58,7 +58,7 @@ stdenv.mkDerivation {
     '';
 
   meta = {
-    homepage = "http://libcxxabi.llvm.org/";
+    homepage = "https://libcxxabi.llvm.org/";
     description = "A new implementation of low level support for a standard C++ library";
     license = with stdenv.lib.licenses; [ ncsa mit ];
     maintainers = with stdenv.lib.maintainers; [ vlstill ];
diff --git a/pkgs/development/compilers/llvm/9/lld.nix b/pkgs/development/compilers/llvm/9/lld.nix
index a746b96f30d..488870e729a 100644
--- a/pkgs/development/compilers/llvm/9/lld.nix
+++ b/pkgs/development/compilers/llvm/9/lld.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "The LLVM Linker";
-    homepage    = "http://lld.llvm.org/";
+    homepage    = "https://lld.llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     platforms   = stdenv.lib.platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/9/lldb.nix b/pkgs/development/compilers/llvm/9/lldb.nix
index 1ba0339d639..a8e193c27b1 100644
--- a/pkgs/development/compilers/llvm/9/lldb.nix
+++ b/pkgs/development/compilers/llvm/9/lldb.nix
@@ -65,7 +65,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A next-generation high-performance debugger";
-    homepage = "http://llvm.org/";
+    homepage = "https://llvm.org/";
     license = licenses.ncsa;
     platforms = platforms.all;
   };
diff --git a/pkgs/development/compilers/llvm/9/llvm.nix b/pkgs/development/compilers/llvm/9/llvm.nix
index 49ea3be34da..013e5bb36b9 100644
--- a/pkgs/development/compilers/llvm/9/llvm.nix
+++ b/pkgs/development/compilers/llvm/9/llvm.nix
@@ -16,6 +16,7 @@
 , enableSharedLibraries ? true
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
+  || stdenv.isAarch32 # broken for the armv7l builder
 )
 , enablePolly ? false
 }:
@@ -160,9 +161,10 @@ in stdenv.mkDerivation (rec {
 
   enableParallelBuilding = true;
 
+  requiredSystemFeatures = [ "big-parallel" ];
   meta = {
     description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = "http://llvm.org/";
+    homepage    = "https://llvm.org/";
     license     = stdenv.lib.licenses.ncsa;
     maintainers = with stdenv.lib.maintainers; [ lovek323 raskin dtzWill ];
     platforms   = stdenv.lib.platforms.all;
diff --git a/pkgs/development/compilers/llvm/9/openmp.nix b/pkgs/development/compilers/llvm/9/openmp.nix
index b5699cd1af0..84f898ec06a 100644
--- a/pkgs/development/compilers/llvm/9/openmp.nix
+++ b/pkgs/development/compilers/llvm/9/openmp.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Components required to build an executable OpenMP program";
-    homepage    = "http://openmp.llvm.org/";
+    homepage    = "https://openmp.llvm.org/";
     license     = stdenv.lib.licenses.mit;
     platforms   = stdenv.lib.platforms.all;
   };