131 lines
4.7 KiB
Nix
131 lines
4.7 KiB
Nix
{ lib, stdenv, llvm_meta
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, monorepoSrc, runCommand
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, cmake, lndir, ninja, python3, fixDarwinDylibNames, version
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, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else null
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, libcxxrt, libunwind
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, enableShared ? !stdenv.hostPlatform.isStatic
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}:
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# external cxxabi is not supported on Darwin as the build will not link libcxx
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# properly and not re-export the cxxabi symbols into libcxx
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# https://github.com/NixOS/nixpkgs/issues/166205
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# https://github.com/NixOS/nixpkgs/issues/269548
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assert cxxabi == null || !stdenv.hostPlatform.isDarwin;
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let
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basename = "libcxx";
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cxxabiName = "lib${if cxxabi == null then "cxxabi" else cxxabi.libName}";
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runtimes = [ "libcxx" ] ++ lib.optional (cxxabi == null) "libcxxabi";
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# Note: useLLVM is likely false for Darwin but true under pkgsLLVM
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useLLVM = stdenv.hostPlatform.useLLVM or false;
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cxxabiCMakeFlags = [
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"-DLIBCXXABI_USE_LLVM_UNWINDER=OFF"
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] ++ lib.optionals (useLLVM && !stdenv.hostPlatform.isWasm) [
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"-DLIBCXXABI_ADDITIONAL_LIBRARIES=unwind"
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"-DLIBCXXABI_USE_COMPILER_RT=ON"
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] ++ lib.optionals stdenv.hostPlatform.isWasm [
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"-DLIBCXXABI_ENABLE_THREADS=OFF"
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"-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
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] ++ lib.optionals (!enableShared) [
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"-DLIBCXXABI_ENABLE_SHARED=OFF"
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];
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cxxCMakeFlags = [
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"-DLIBCXX_CXX_ABI=${cxxabiName}"
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] ++ lib.optionals (cxxabi != null) [
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"-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${lib.getDev cxxabi}/include"
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] ++ lib.optionals (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) [
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"-DLIBCXX_HAS_MUSL_LIBC=1"
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] ++ lib.optionals (lib.versionAtLeast version "18" && !useLLVM && stdenv.hostPlatform.libc == "glibc" && !stdenv.hostPlatform.isStatic) [
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"-DLIBCXX_ADDITIONAL_LIBRARIES=gcc_s"
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] ++ lib.optionals useLLVM [
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"-DLIBCXX_USE_COMPILER_RT=ON"
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# There's precedent for this in llvm-project/libcxx/cmake/caches.
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# In a monorepo build you might do the following in the libcxxabi build:
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# -DLLVM_ENABLE_PROJECTS=libcxxabi;libunwinder
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# -DLIBCXXABI_STATICALLY_LINK_UNWINDER_IN_STATIC_LIBRARY=On
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# libcxx appears to require unwind and doesn't pull it in via other means.
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"-DLIBCXX_ADDITIONAL_LIBRARIES=unwind"
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] ++ lib.optionals stdenv.hostPlatform.isWasm [
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"-DLIBCXX_ENABLE_THREADS=OFF"
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"-DLIBCXX_ENABLE_FILESYSTEM=OFF"
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"-DLIBCXX_ENABLE_EXCEPTIONS=OFF"
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] ++ lib.optionals (!enableShared) [
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"-DLIBCXX_ENABLE_SHARED=OFF"
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];
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cmakeFlags = [
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"-DLLVM_ENABLE_RUNTIMES=${lib.concatStringsSep ";" runtimes}"
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] ++ lib.optionals stdenv.hostPlatform.isWasm [
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"-DCMAKE_C_COMPILER_WORKS=ON"
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"-DCMAKE_CXX_COMPILER_WORKS=ON"
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"-DUNIX=ON" # Required otherwise libc++ fails to detect the correct linker
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] ++ cxxCMakeFlags
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++ lib.optionals (cxxabi == null) cxxabiCMakeFlags;
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in
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stdenv.mkDerivation rec {
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pname = basename;
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inherit version cmakeFlags;
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src = runCommand "${pname}-src-${version}" {} (''
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mkdir -p "$out/llvm"
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cp -r ${monorepoSrc}/cmake "$out"
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cp -r ${monorepoSrc}/libcxx "$out"
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cp -r ${monorepoSrc}/llvm/cmake "$out/llvm"
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cp -r ${monorepoSrc}/llvm/utils "$out/llvm"
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cp -r ${monorepoSrc}/third-party "$out"
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cp -r ${monorepoSrc}/runtimes "$out"
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'' + lib.optionalString (cxxabi == null) ''
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cp -r ${monorepoSrc}/libcxxabi "$out"
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'');
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outputs = [ "out" "dev" ];
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patches = lib.optionals (stdenv.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinMinVersion "10.13") [
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# https://github.com/llvm/llvm-project/issues/64226
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./0001-darwin-10.12-mbstate_t-fix.patch
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];
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postPatch = ''
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cd runtimes
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'';
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preConfigure = lib.optionalString stdenv.hostPlatform.isMusl ''
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patchShebangs utils/cat_files.py
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'';
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nativeBuildInputs = [ cmake ninja python3 ]
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++ lib.optional stdenv.isDarwin fixDarwinDylibNames
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++ lib.optional (cxxabi != null) lndir;
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buildInputs = [ cxxabi ]
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++ lib.optionals (useLLVM && !stdenv.hostPlatform.isWasm) [ libunwind ];
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# libc++.so is a linker script which expands to multiple libraries,
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# libc++.so.1 and libc++abi.so or the external cxxabi. ld-wrapper doesn't
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# support linker scripts so the external cxxabi needs to be symlinked in
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postInstall = lib.optionalString (cxxabi != null) ''
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lndir ${lib.getDev cxxabi}/include ''${!outputDev}/include/c++/v1
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lndir ${lib.getLib cxxabi}/lib ''${!outputLib}/lib
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'';
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passthru = {
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isLLVM = true;
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};
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meta = llvm_meta // {
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homepage = "https://libcxx.llvm.org/";
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description = "C++ standard library";
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longDescription = ''
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libc++ is an implementation of the C++ standard library, targeting C++11,
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C++14 and above.
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'';
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# "All of the code in libc++ is dual licensed under the MIT license and the
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# UIUC License (a BSD-like license)":
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license = with lib.licenses; [ mit ncsa ];
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};
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}
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