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{ lib, stdenv, llvm_meta
, monorepoSrc, runCommand, fetchpatch
, cmake, ninja, python3, fixDarwinDylibNames, version
, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
, libcxxabi, libcxxrt, libunwind
, enableShared ? !stdenv.hostPlatform.isStatic
# If headersOnly is true, the resulting package would only include the headers.
# Use this to break the circular dependency between libcxx and libcxxabi.
#
# Some context:
# https://reviews.llvm.org/rG1687f2bbe2e2aaa092f942d4a97d41fad43eedfb
, headersOnly ? false
}:
let
basename = "libcxx";
in
assert stdenv.isDarwin -> cxxabi.libName == "c++abi";
stdenv.mkDerivation rec {
pname = basename + lib.optionalString headersOnly "-headers";
inherit version;
src = runCommand "${pname}-src-${version}" {} ''
mkdir -p "$out"
cp -r ${monorepoSrc}/cmake "$out"
cp -r ${monorepoSrc}/${basename} "$out"
mkdir -p "$out/libcxxabi"
cp -r ${monorepoSrc}/libcxxabi/include "$out/libcxxabi"
mkdir -p "$out/llvm"
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"
'';
sourceRoot = "${src.name}/runtimes";
outputs = [ "out" ] ++ lib.optional (!headersOnly) "dev";
prePatch = ''
cd ../${basename}
chmod -R u+w .
'';
patches = [
./gnu-install-dirs.patch
# fix for https://github.com/NixOS/nixpkgs/issues/269548
# https://github.com/llvm/llvm-project/pull/77218
(fetchpatch {
name = "darwin-system-libcxxabi-link-flags.patch";
url = "https://github.com/llvm/llvm-project/commit/c5b89b29ee6e3c444a355fd1cf733ce7ab2e316a.patch";
hash = "sha256-LNoPg1KCoP8RWxU/AzHR52f4Dww24I9BGQJedMhFxyQ=";
relative = "libcxx";
})
];
postPatch = ''
cd ../runtimes
'';
preConfigure = lib.optionalString stdenv.hostPlatform.isMusl ''
patchShebangs utils/cat_files.py
'';
nativeBuildInputs = [ cmake ninja python3 ]
++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
buildInputs =
lib.optionals (!headersOnly) [ cxxabi ]
++ lib.optionals (stdenv.hostPlatform.useLLVM or false && !stdenv.hostPlatform.isWasm) [ libunwind ];
cmakeFlags = let
# See: https://libcxx.llvm.org/BuildingLibcxx.html#cmdoption-arg-libcxx-cxx-abi-string
libcxx_cxx_abi_opt = {
"c++abi" = "system-libcxxabi";
"cxxrt" = "libcxxrt";
}.${cxxabi.libName} or (throw "unknown cxxabi: ${cxxabi.libName} (${cxxabi.pname})");
in [
"-DLLVM_ENABLE_RUNTIMES=libcxx"
"-DLIBCXX_CXX_ABI=${if headersOnly then "none" else libcxx_cxx_abi_opt}"
] ++ lib.optional (!headersOnly && cxxabi.libName == "c++abi") "-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${cxxabi.dev}/include/c++/v1"
++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
++ lib.optionals (stdenv.hostPlatform.useLLVM or false) [
"-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"
"-DUNIX=ON" # Required otherwise libc++ fails to detect the correct linker
] ++ lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF"
# If we're only building the headers we don't actually *need* a functioning
# C/C++ compiler:
++ lib.optionals (headersOnly) [
"-DCMAKE_C_COMPILER_WORKS=ON"
"-DCMAKE_CXX_COMPILER_WORKS=ON"
];
ninjaFlags = lib.optional headersOnly "generate-cxx-headers";
installTargets = lib.optional headersOnly "install-cxx-headers";
passthru = {
isLLVM = true;
inherit cxxabi;
};
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 ];
};
}
|