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{ lib
, stdenv
, llvm_meta
, release_version
, monorepoSrc ? null
, src ? null
, patches ? []
, runCommand
, substitute
, cmake
, lndir
, ninja
, python3
, fixDarwinDylibNames
, version
, freebsd
, cxxabi ? if stdenv.hostPlatform.isFreeBSD then freebsd.libcxxrt else null
, 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";
pname = basename;
cxxabiName = "lib${if cxxabi == null then "cxxabi" else cxxabi.libName}";
runtimes = [ "libcxx" ] ++ lib.optional (cxxabi == null) "libcxxabi";
# Note: useLLVM is likely false for Darwin but true under pkgsLLVM
useLLVM = stdenv.hostPlatform.useLLVM or false;
src' = if monorepoSrc != null then
runCommand "${pname}-src-${version}" {} (''
mkdir -p "$out/llvm"
'' + (lib.optionalString (lib.versionAtLeast release_version "14") ''
cp -r ${monorepoSrc}/cmake "$out"
'') + ''
cp -r ${monorepoSrc}/libcxx "$out"
cp -r ${monorepoSrc}/llvm/cmake "$out/llvm"
cp -r ${monorepoSrc}/llvm/utils "$out/llvm"
'' + (lib.optionalString (lib.versionAtLeast release_version "14") ''
cp -r ${monorepoSrc}/third-party "$out"
'') + ''
cp -r ${monorepoSrc}/runtimes "$out"
'' + (lib.optionalString (cxxabi == null) ''
cp -r ${monorepoSrc}/libcxxabi "$out"
'')) else src;
cxxabiCMakeFlags = lib.optionals (lib.versionAtLeast release_version "18") [
"-DLIBCXXABI_USE_LLVM_UNWINDER=OFF"
] ++ lib.optionals (useLLVM && !stdenv.hostPlatform.isWasm) (if lib.versionAtLeast release_version "18" then [
"-DLIBCXXABI_ADDITIONAL_LIBRARIES=unwind"
"-DLIBCXXABI_USE_COMPILER_RT=ON"
] else [
"-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=${cxxabiName}"
] ++ lib.optionals (cxxabi == null && lib.versionAtLeast release_version "16") [
# Note: llvm < 16 doesn't support this flag (or it's broken); handled in postInstall instead.
# Include libc++abi symbols within libc++.a for static linking libc++;
# dynamic linking includes them through libc++.so being a linker script
# which includes both shared objects.
"-DLIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON"
] ++ lib.optionals (cxxabi != null) [
"-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${lib.getDev cxxabi}/include"
] ++ lib.optionals (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) [
"-DLIBCXX_HAS_MUSL_LIBC=1"
] ++ lib.optionals (lib.versionAtLeast release_version "18" && !useLLVM && stdenv.hostPlatform.libc == "glibc" && !stdenv.hostPlatform.isStatic) [
"-DLIBCXX_ADDITIONAL_LIBRARIES=gcc_s"
] ++ lib.optionals (lib.versionAtLeast release_version "18" && stdenv.hostPlatform.isFreeBSD) [
# Name and documentation claim this is for libc++abi, but its man effect is adding `-lunwind`
# to the libc++.so linker script. We want FreeBSD's so-called libgcc instead of libunwind.
"-DLIBCXXABI_USE_LLVM_UNWINDER=OFF"
] ++ lib.optionals useLLVM [
"-DLIBCXX_USE_COMPILER_RT=ON"
] ++ lib.optionals (useLLVM && !stdenv.hostPlatform.isFreeBSD && lib.versionAtLeast release_version "16") [
"-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"
] ++ lib.optionals (cxxabi != null && cxxabi.libName == "cxxrt") [
"-DLIBCXX_ENABLE_NEW_DELETE_DEFINITIONS=ON"
];
cmakeFlags = [
"-DLLVM_ENABLE_RUNTIMES=${lib.concatStringsSep ";" runtimes}"
] ++ 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 {
inherit pname version cmakeFlags patches;
src = src';
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 && !stdenv.hostPlatform.isFreeBSD) [ 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 $dev/include/c++/v1
lndir ${lib.getLib cxxabi}/lib $out/lib
libcxxabi=$out/lib/lib${cxxabi.libName}.a
''
# LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY=ON doesn't work for LLVM < 16 or
# external cxxabi libraries so merge libc++abi.a into libc++.a ourselves.
# GNU binutils emits objects in LIFO order in MRI scripts so after the merge
# the objects are in reversed order so a second MRI script is required so the
# objects in the archive are listed in proper order (libc++.a, libc++abi.a)
+ lib.optionalString (cxxabi != null || lib.versionOlder release_version "16") ''
libcxxabi=''${libcxxabi-$out/lib/libc++abi.a}
if [[ -f $out/lib/libc++.a && -e $libcxxabi ]]; then
$AR -M <<MRI
create $out/lib/libc++.a
addlib $out/lib/libc++.a
addlib $libcxxabi
save
end
MRI
$AR -M <<MRI
create $out/lib/libc++.a
addlib $out/lib/libc++.a
save
end
MRI
fi
'';
passthru = {
isLLVM = true;
};
meta = llvm_meta // {
homepage = "https://libcxx.llvm.org/";
description = "C++ standard library";
longDescription = ''
libc++ is an implementation of the C++ standard library, targeting C++11,
C++14 and above.
'';
# "All of the code in libc++ is dual licensed under the MIT license and the
# UIUC License (a BSD-like license)":
license = with lib.licenses; [ mit ncsa ];
};
} // (if (lib.versionOlder release_version "16" || lib.versionAtLeast release_version "17") then {
postPatch = (lib.optionalString (lib.versionAtLeast release_version "14" && lib.versionOlder release_version "15") ''
# fix CMake error when static and LIBCXXABI_USE_LLVM_UNWINDER=ON. aren't
# building unwind so don't need to depend on it
substituteInPlace libcxx/src/CMakeLists.txt \
--replace-fail "add_dependencies(cxx_static unwind)" "# add_dependencies(cxx_static unwind)"
'') + ''
cd runtimes
'';
} else {
sourceRoot = "${src'.name}/runtimes";
}))
|