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