llvm: Fix compiler-rt missing sanitizers when using useLLVM (344902e0) · Commits · nix / nixpkgs

pkgs/development/compilers/llvm/12/default.nix

+65 −23

Original line number	Diff line number	Diff line
		@@ -2,6 +2,7 @@
		, preLibcCrossHeaders
		, substitute, substituteAll, fetchFromGitHub, fetchpatch, fetchurl
		, overrideCC, wrapCCWith, wrapBintoolsWith
		, libxcrypt
		, buildLlvmTools # tools, but from the previous stage, for cross
		, targetLlvmLibraries # libraries, but from the next stage, for cross
		, targetLlvm
		@@ -49,6 +50,10 @@ let
		ln -s "${cc.lib}/lib/clang/${metadata.release_version}/include" "$rsrc"
		echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
		'';
		mkExtraBuildCommandsBasicRt = cc: mkExtraBuildCommands0 cc + ''
		ln -s "${targetLlvmLibraries.compiler-rt-no-libc.out}/lib" "$rsrc/lib"
		ln -s "${targetLlvmLibraries.compiler-rt-no-libc.out}/share" "$rsrc/share"
		'';
		mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
		ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
		ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
		@@ -245,34 +250,50 @@ let
		'' + mkExtraBuildCommands cc;
		};

		clangNoLibcxx = wrapCCWith rec {
		clangWithLibcAndBasicRtAndLibcxx = wrapCCWith rec {
		cc = tools.clang-unwrapped;
		libcxx = targetLlvmLibraries.libcxx;
		bintools = bintools';
		extraPackages = [
		targetLlvmLibraries.compiler-rt-no-libc
		] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
		targetLlvmLibraries.libunwind
		];
		extraBuildCommands = ''
		echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
		echo "-Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		'' + mkExtraBuildCommandsBasicRt cc;
		};

		clangWithLibcAndBasicRt = wrapCCWith rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		bintools = bintools';
		extraPackages = [
		targetLlvmLibraries.compiler-rt
		targetLlvmLibraries.compiler-rt-no-libc
		];
		extraBuildCommands = ''
		echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		echo "-nostdlib++" >> $out/nix-support/cc-cflags
		'' + mkExtraBuildCommands cc;
		'' + mkExtraBuildCommandsBasicRt cc;
		};

		clangNoLibc = wrapCCWith rec {
		clangNoLibcWithBasicRt = wrapCCWith rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		bintools = bintoolsNoLibc';
		extraPackages = [
		targetLlvmLibraries.compiler-rt
		targetLlvmLibraries.compiler-rt-no-libc
		];
		extraBuildCommands = ''
		echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
		'' + mkExtraBuildCommands cc;
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		'' + mkExtraBuildCommandsBasicRt cc;
		};

		clangNoCompilerRt = wrapCCWith rec {
		clangNoLibcNoRt = wrapCCWith rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		bintools = bintoolsNoLibc';
		@@ -282,6 +303,8 @@ let
		'' + mkExtraBuildCommands0 cc;
		};

		# This is an "oddly ordered" bootstrap just for Darwin. Probably
		# don't want it otherwise.
		clangNoCompilerRtWithLibc = wrapCCWith rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		@@ -290,13 +313,23 @@ let
		extraBuildCommands = mkExtraBuildCommands0 cc;
		};

		# Aliases
		clangNoCompilerRt = tools.clangNoLibcNoRt;
		clangNoLibc = tools.clangNoLibcWithBasicRt;
		clangNoLibcxx = tools.clangWithLibcAndBasicRt;
		});

		libraries = lib.makeExtensible (libraries: let
		callPackage = newScope (libraries // buildLlvmTools // args // metadata);
		in {

		compiler-rt-libc = callPackage ../common/compiler-rt {
		compiler-rt-libc = callPackage ../common/compiler-rt (let
		stdenv =
		if args.stdenv.hostPlatform.useLLVM or false then
		overrideCC args.stdenv buildLlvmTools.clangWithLibcAndBasicRtAndLibcxx
		else
		args.stdenv;
		in {
		src = fetch "compiler-rt" "1950rg294izdwkaasi7yjrmadc9mzdd5paf0q63jjcq2m3rdbj5l";
		patches = [
		../common/compiler-rt/7-12-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
		@@ -312,10 +345,12 @@ let
		../common/compiler-rt/armv6-sync-ops-no-thumb.patch
		../common/compiler-rt/armv6-no-ldrexd-strexd.patch
		];
		stdenv = if stdenv.hostPlatform.useLLVM or false
		then overrideCC stdenv buildLlvmTools.clangNoCompilerRtWithLibc
		else stdenv;
		};
		inherit stdenv;
		} // lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
		libxcrypt = (libxcrypt.override { inherit stdenv; }).overrideAttrs (old: {
		configureFlags = old.configureFlags ++ [ "--disable-symvers" ];
		});
		});

		compiler-rt-no-libc = callPackage ../common/compiler-rt {
		src = fetch "compiler-rt" "1950rg294izdwkaasi7yjrmadc9mzdd5paf0q63jjcq2m3rdbj5l";
		@@ -333,15 +368,22 @@ let
		../common/compiler-rt/armv6-sync-ops-no-thumb.patch
		../common/compiler-rt/armv6-no-ldrexd-strexd.patch
		];
		stdenv = if stdenv.hostPlatform.useLLVM or false
		then overrideCC stdenv buildLlvmTools.clangNoCompilerRt
		else stdenv;
		stdenv =
		if stdenv.hostPlatform.isDarwin && stdenv.hostPlatform == stdenv.buildPlatform then
		stdenv
		else
		# TODO: make this branch unconditional next rebuild
		overrideCC stdenv buildLlvmTools.clangNoLibcNoRt;
		};

		# N.B. condition is safe because without useLLVM both are the same.
		compiler-rt = if stdenv.hostPlatform.isAndroid
		then libraries.compiler-rt-libc
		else libraries.compiler-rt-no-libc;
		compiler-rt =
		# Building the with-libc compiler-rt and WASM doesn't yet work,
		# because wasilibc doesn't provide some expected things. See
		# compiler-rt's file for further details.
		if stdenv.hostPlatform.libc == null \|\| stdenv.hostPlatform.isWasm then
		libraries.compiler-rt-no-libc
		else
		libraries.compiler-rt-libc;

		stdenv = overrideCC stdenv buildLlvmTools.clang;

		@@ -376,7 +418,7 @@ let
		];
		})
		];
		stdenv = overrideCC stdenv buildLlvmTools.clangNoLibcxx;
		stdenv = overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
		};

		libunwind = callPackage ../common/libunwind {
		@@ -384,7 +426,7 @@ let
		patches = [
		./libunwind/gnu-install-dirs.patch
		];
		stdenv = overrideCC stdenv buildLlvmTools.clangNoLibcxx;
		stdenv = overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
		};

		openmp = callPackage ../common/openmp {

pkgs/development/compilers/llvm/common/compiler-rt/default.nix

+28 −11

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@
		, python3
		, xcbuild
		, libllvm
		, libcxx
		, linuxHeaders
		, libxcrypt

		@@ -33,6 +34,9 @@ let
		useLLVM = stdenv.hostPlatform.useLLVM or false;
		bareMetal = stdenv.hostPlatform.parsed.kernel.name == "none";
		haveLibc = stdenv.cc.libc != null;
		# TODO: Make this account for GCC having libstdcxx, which will help
		# use clean up the `cmakeFlags` rats nest below.
		haveLibcxx = stdenv.cc.libcxx != null;
		isDarwinStatic = stdenv.hostPlatform.isDarwin && stdenv.hostPlatform.isStatic && lib.versionAtLeast release_version "16";
		inherit (stdenv.hostPlatform) isMusl isAarch64;

		@@ -46,7 +50,7 @@ let
		cp -r ${monorepoSrc}/${baseName} "$out"
		'' else src;

		preConfigure = lib.optionalString (useLLVM && !haveLibc) ''
		preConfigure = lib.optionalString (!haveLibc) ''
		cmakeFlagsArray+=(-DCMAKE_C_FLAGS="-nodefaultlibs -ffreestanding")
		'';
		in
		@@ -82,23 +86,32 @@ stdenv.mkDerivation ({
		"-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
		] ++ lib.optionals (haveLibc && stdenv.hostPlatform.libc == "glibc") [
		"-DSANITIZER_COMMON_CFLAGS=-I${libxcrypt}/include"
		] ++ lib.optionals ((useLLVM \|\| bareMetal \|\| isMusl \|\| isAarch64) && (lib.versions.major release_version == "13")) [
		] ++ lib.optionals (useLLVM && haveLibc && stdenv.cc.libcxx == libcxx) [
		"-DSANITIZER_CXX_ABI=libcxxabi"
		"-DSANITIZER_CXX_ABI_LIBNAME=libcxxabi"
		"-DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON"
		] ++ lib.optionals ((!haveLibc \|\| bareMetal \|\| isMusl \|\| isAarch64) && (lib.versions.major release_version == "13")) [
		"-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
		] ++ lib.optionals (useLLVM \|\| bareMetal \|\| isMusl \|\| isDarwinStatic) [
		] ++ lib.optionals (useLLVM && haveLibc) [
		"-DCOMPILER_RT_BUILD_SANITIZERS=ON"
		] ++ lib.optionals (!haveLibc \|\| bareMetal \|\| isMusl \|\| isDarwinStatic) [
		"-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
		] ++ lib.optionals ((useLLVM && !haveLibcxx) \|\| !haveLibc \|\| bareMetal \|\| isMusl \|\| isDarwinStatic) [
		"-DCOMPILER_RT_BUILD_XRAY=OFF"
		"-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
		"-DCOMPILER_RT_BUILD_MEMPROF=OFF"
		"-DCOMPILER_RT_BUILD_ORC=OFF" # may be possible to build with musl if necessary
		] ++ lib.optionals (useLLVM \|\| bareMetal) [
		] ++ lib.optionals (useLLVM && haveLibc) [
		"-DCOMPILER_RT_BUILD_PROFILE=ON"
		] ++ lib.optionals (!haveLibc \|\| bareMetal) [
		"-DCOMPILER_RT_BUILD_PROFILE=OFF"
		] ++ lib.optionals ((useLLVM && !haveLibc) \|\| bareMetal \|\| isDarwinStatic) [
		] ++ lib.optionals (!haveLibc \|\| bareMetal \|\| isDarwinStatic) [
		"-DCMAKE_CXX_COMPILER_WORKS=ON"
		] ++ lib.optionals ((useLLVM && !haveLibc) \|\| bareMetal) [
		] ++ lib.optionals (!haveLibc \|\| bareMetal) [
		"-DCMAKE_C_COMPILER_WORKS=ON"
		"-DCOMPILER_RT_BAREMETAL_BUILD=ON"
		"-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
		] ++ lib.optionals (useLLVM && !haveLibc) [
		] ++ lib.optionals (!haveLibc) [
		"-DCMAKE_C_FLAGS=-nodefaultlibs"
		] ++ lib.optionals (useLLVM) [
		"-DCOMPILER_RT_BUILD_BUILTINS=ON"
		@@ -133,7 +146,7 @@ stdenv.mkDerivation ({
		'' + lib.optionalString stdenv.isDarwin ''
		substituteInPlace cmake/config-ix.cmake \
		--replace 'set(COMPILER_RT_HAS_TSAN TRUE)' 'set(COMPILER_RT_HAS_TSAN FALSE)'
		'' + lib.optionalString (useLLVM && !haveLibc) ((lib.optionalString (lib.versionAtLeast release_version "18") ''
		'' + lib.optionalString (!haveLibc) ((lib.optionalString (lib.versionAtLeast release_version "18") ''
		substituteInPlace lib/builtins/aarch64/sme-libc-routines.c \
		--replace "<stdlib.h>" "<stddef.h>"
		'') + ''
		@@ -185,8 +198,12 @@ stdenv.mkDerivation ({
		# "All of the code in the compiler-rt project is dual licensed under the MIT
		# license and the UIUC License (a BSD-like license)":
		license = with lib.licenses; [ mit ncsa ];
		broken =
		# compiler-rt requires a Clang stdenv on 32-bit RISC-V:
		# https://reviews.llvm.org/D43106#1019077
		broken = stdenv.hostPlatform.isRiscV32 && !stdenv.cc.isClang;
		(stdenv.hostPlatform.isRiscV32 && !stdenv.cc.isClang)
		# emutls wants `<pthread.h>` which isn't avaiable (without exeprimental WASM threads proposal).
		# `enable_execute_stack.c` Also doesn't sound like something WASM would support.
		\|\| (stdenv.hostPlatform.isWasm && haveLibc);
		};
		} // (if lib.versionOlder release_version "16" then { inherit preConfigure; } else {}))

pkgs/development/compilers/llvm/common/default.nix

+118 −35

Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		lib,
		stdenv,
		preLibcCrossHeaders,
		libxcrypt,
		substitute,
		substituteAll,
		fetchFromGitHub,
		@@ -114,6 +115,13 @@ let
		ln -s "${cc.lib}/lib/clang/${clangVersion}/include" "$rsrc"
		echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
		'';
		mkExtraBuildCommandsBasicRt =
		cc:
		mkExtraBuildCommands0 cc
		+ ''
		ln -s "${targetLlvmLibraries.compiler-rt-no-libc.out}/lib" "$rsrc/lib"
		ln -s "${targetLlvmLibraries.compiler-rt-no-libc.out}/share" "$rsrc/share"
		'';
		mkExtraBuildCommands =
		cc:
		mkExtraBuildCommands0 cc
		@@ -443,25 +451,76 @@ let
		}
		);

		clangNoLibcxx = wrapCCWith (
		clangWithLibcAndBasicRtAndLibcxx = wrapCCWith (
		rec {
		cc = tools.clang-unwrapped;
		libcxx = targetLlvmLibraries.libcxx;
		bintools = bintools';
		extraPackages =
		[ targetLlvmLibraries.compiler-rt-no-libc ]
		++ lib.optionals (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD) [
		targetLlvmLibraries.libunwind
		];
		extraBuildCommands =
		lib.optionalString (lib.versions.major metadata.release_version == "13") (
		''
		echo "-rtlib=compiler-rt -Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		''
		+ lib.optionalString (!stdenv.targetPlatform.isWasm) ''
		echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
		echo "-L${targetLlvmLibraries.libunwind}/lib" >> $out/nix-support/cc-ldflags
		''
		+ lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
		echo "-lunwind" >> $out/nix-support/cc-ldflags
		''
		+ lib.optionalString stdenv.targetPlatform.isWasm ''
		echo "-fno-exceptions" >> $out/nix-support/cc-cflags
		''
		)
		+ mkExtraBuildCommandsBasicRt cc;
		}
		// lib.optionalAttrs (lib.versionAtLeast metadata.release_version "14") {
		nixSupport.cc-cflags =
		[
		"-rtlib=compiler-rt"
		"-Wno-unused-command-line-argument"
		"-B${targetLlvmLibraries.compiler-rt-no-libc}/lib"
		]
		++ lib.optional (
		!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD
		) "--unwindlib=libunwind"
		++ lib.optional (
		!stdenv.targetPlatform.isWasm
		&& !stdenv.targetPlatform.isFreeBSD
		&& stdenv.targetPlatform.useLLVM or false
		) "-lunwind"
		++ lib.optional stdenv.targetPlatform.isWasm "-fno-exceptions";
		nixSupport.cc-ldflags = lib.optionals (
		!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD
		) [ "-L${targetLlvmLibraries.libunwind}/lib" ];
		}
		);

		clangWithLibcAndBasicRt = wrapCCWith (
		rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		bintools = bintools';
		extraPackages = [ targetLlvmLibraries.compiler-rt ];
		extraPackages = [ targetLlvmLibraries.compiler-rt-no-libc ];
		extraBuildCommands =
		lib.optionalString (lib.versions.major metadata.release_version == "13") ''
		echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		echo "-nostdlib++" >> $out/nix-support/cc-cflags
		''
		+ mkExtraBuildCommands cc;
		+ mkExtraBuildCommandsBasicRt cc;
		}
		// lib.optionalAttrs (lib.versionAtLeast metadata.release_version "14") {
		nixSupport.cc-cflags =
		[
		"-rtlib=compiler-rt"
		"-B${targetLlvmLibraries.compiler-rt}/lib"
		"-B${targetLlvmLibraries.compiler-rt-no-libc}/lib"
		"-nostdlib++"
		]
		++ lib.optional (
		@@ -470,24 +529,24 @@ let
		}
		);

		clangNoLibc = wrapCCWith (
		clangNoLibcWithBasicRt = wrapCCWith (
		rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		bintools = bintoolsNoLibc';
		extraPackages = [ targetLlvmLibraries.compiler-rt ];
		extraPackages = [ targetLlvmLibraries.compiler-rt-no-libc ];
		extraBuildCommands =
		lib.optionalString (lib.versions.major metadata.release_version == "13") ''
		echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
		echo "-B${targetLlvmLibraries.compiler-rt-no-libc}/lib" >> $out/nix-support/cc-cflags
		''
		+ mkExtraBuildCommands cc;
		+ mkExtraBuildCommandsBasicRt cc;
		}
		// lib.optionalAttrs (lib.versionAtLeast metadata.release_version "14") {
		nixSupport.cc-cflags =
		[
		"-rtlib=compiler-rt"
		"-B${targetLlvmLibraries.compiler-rt}/lib"
		"-B${targetLlvmLibraries.compiler-rt-no-libc}/lib"
		]
		++ lib.optional (
		lib.versionAtLeast metadata.release_version "15" && stdenv.targetPlatform.isWasm
		@@ -495,7 +554,7 @@ let
		}
		);

		clangNoCompilerRt = wrapCCWith (
		clangNoLibcNoRt = wrapCCWith (
		rec {
		cc = tools.clang-unwrapped;
		libcxx = null;
		@@ -516,6 +575,8 @@ let
		}
		);

		# This is an "oddly ordered" bootstrap just for Darwin. Probably
		# don't want it otherwise.
		clangNoCompilerRtWithLibc =
		wrapCCWith rec {
		cc = tools.clang-unwrapped;
		@@ -527,6 +588,11 @@ let
		// lib.optionalAttrs (
		lib.versionAtLeast metadata.release_version "15" && stdenv.targetPlatform.isWasm
		) { nixSupport.cc-cflags = [ "-fno-exceptions" ]; };

		# Aliases
		clangNoCompilerRt = tools.clangNoLibcNoRt;
		clangNoLibc = tools.clangNoLibcWithBasicRt;
		clangNoLibcxx = tools.clangWithLibcAndBasicRt;
		}
		// lib.optionalAttrs (lib.versionAtLeast metadata.release_version "15") {
		# TODO: pre-15: lldb/docs/index.rst:155:toctree contains reference to nonexisting document 'design/structureddataplugins'
		@@ -601,40 +667,57 @@ let
		);
		in
		{
		compiler-rt-libc = callPackage ./compiler-rt {
		patches = compiler-rtPatches;
		compiler-rt-libc = callPackage ./compiler-rt (
		let
		# temp rename to avoid infinite recursion
		stdenv =
		if
		stdenv.hostPlatform.useLLVM or false
		\|\| (
		if args.stdenv.hostPlatform.useLLVM or false then
		overrideCC args.stdenv buildLlvmTools.clangWithLibcAndBasicRtAndLibcxx
		else if
		lib.versionAtLeast metadata.release_version "16"
		&& stdenv.hostPlatform.isDarwin
		&& stdenv.hostPlatform.isStatic
		)
		&& args.stdenv.hostPlatform.isDarwin
		&& args.stdenv.hostPlatform.isStatic
		then
		overrideCC stdenv buildLlvmTools.clangNoCompilerRtWithLibc
		overrideCC args.stdenv buildLlvmTools.clangNoCompilerRtWithLibc
		else
		args.stdenv;
		};
		in
		{
		patches = compiler-rtPatches;
		inherit stdenv;
		}
		// lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
		libxcrypt = (libxcrypt.override { inherit stdenv; }).overrideAttrs (old: {
		configureFlags = old.configureFlags ++ [ "--disable-symvers" ];
		});
		}
		);

		compiler-rt-no-libc = callPackage ./compiler-rt {
		patches = compiler-rtPatches;
		stdenv =
		if stdenv.hostPlatform.useLLVM or false then
		overrideCC stdenv buildLlvmTools.clangNoCompilerRt
		if stdenv.hostPlatform.isDarwin && stdenv.hostPlatform == stdenv.buildPlatform then
		stdenv
		else
		stdenv;
		# TODO: make this branch unconditional next rebuild
		overrideCC stdenv buildLlvmTools.clangNoLibcNoRt;
		};

		# N.B. condition is safe because without useLLVM both are the same.
		compiler-rt =
		if
		stdenv.hostPlatform.isAndroid
		\|\| (lib.versionAtLeast metadata.release_version "16" && stdenv.hostPlatform.isDarwin)
		stdenv.hostPlatform.libc == null
		# Building the with-libc compiler-rt and WASM doesn't yet work,
		# because wasilibc doesn't provide some expected things. See
		# compiler-rt's file for further details.
		\|\| stdenv.hostPlatform.isWasm
		# Failing `#include <term.h>` in
		# `lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp`
		# sanitizers, not sure where to get it.
		\|\| stdenv.hostPlatform.isFreeBSD
		then
		libraries.compiler-rt-libc
		libraries.compiler-rt-no-libc
		else
		libraries.compiler-rt-no-libc;
		libraries.compiler-rt-libc;

		stdenv = overrideCC stdenv buildLlvmTools.clang;

		@@ -698,7 +781,7 @@ let
		)
		# https://github.com/llvm/llvm-project/issues/64226
		(metadata.getVersionFile "libcxx/0001-darwin-10.12-mbstate_t-fix.patch");
		stdenv = overrideCC stdenv buildLlvmTools.clangNoLibcxx;
		stdenv = overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
		}
		// lib.optionalAttrs (lib.versionOlder metadata.release_version "14") {
		# TODO: remove this, causes LLVM 13 packages rebuild.
		@@ -710,7 +793,7 @@ let
		patches = lib.optional (lib.versionOlder metadata.release_version "17") (
		metadata.getVersionFile "libunwind/gnu-install-dirs.patch"
		);
		stdenv = overrideCC stdenv buildLlvmTools.clangNoLibcxx;
		stdenv = overrideCC stdenv buildLlvmTools.clangWithLibcAndBasicRt;
		};

		openmp = callPackage ./openmp {

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