1 files changed, 87 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/llvm/12/libcxxabi/default.nix b/nixpkgs/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
new file mode 100644
index 000000000000..5ebb77ad3880
--- /dev/null
+++ b/nixpkgs/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
@@ -0,0 +1,87 @@
+{ lib, stdenv, llvm_meta, cmake, python3, fetch, libcxx, libunwind, llvm, version
+, enableShared ? !stdenv.hostPlatform.isStatic
+, standalone ? stdenv.hostPlatform.useLLVM or false
+, withLibunwind ? !stdenv.isDarwin && !stdenv.hostPlatform.isWasm
+}:
+
+stdenv.mkDerivation {
+  pname = "libcxxabi";
+  inherit version;
+
+  src = fetch "libcxxabi" "1l4idd8npbkm168d26kqn529yv3npsd8f2dm8a7iwyknj7iyivw8";
+
+  outputs = [ "out" "dev" ];
+
+  postUnpack = ''
+    unpackFile ${libcxx.src}
+    mv libcxx-* libcxx
+    unpackFile ${llvm.src}
+    mv llvm-* llvm
+  '' + lib.optionalString stdenv.isDarwin ''
+    export TRIPLE=x86_64-apple-darwin
+  '' + lib.optionalString stdenv.hostPlatform.isMusl ''
+    patch -p1 -d libcxx -i ${../../common/libcxx/libcxx-0001-musl-hacks.patch}
+  '' + lib.optionalString stdenv.hostPlatform.isWasm ''
+    patch -p1 -d llvm -i ${../../common/libcxxabi/wasm.patch}
+  '';
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake python3 ];
+  buildInputs = lib.optional withLibunwind libunwind;
+
+  cmakeFlags = lib.optionals standalone [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
+  ];
+
+  preInstall = lib.optionalString stdenv.isDarwin ''
+    for file in lib/*.dylib; do
+      if [ -L "$file" ]; then continue; fi
+
+      # Fix up the install name. Preserve the basename, just replace the path.
+      installName="$out/lib/$(basename $(${stdenv.cc.targetPrefix}otool -D $file | tail -n 1))"
+
+      # this should be done in CMake, but having trouble figuring out
+      # the magic combination of necessary CMake variables
+      # if you fancy a try, take a look at
+      # https://gitlab.kitware.com/cmake/community/-/wikis/doc/cmake/RPATH-handling
+      ${stdenv.cc.targetPrefix}install_name_tool -id $installName $file
+
+      # cc-wrapper passes '-lc++abi' to all c++ link steps, but that causes
+      # libcxxabi to sometimes link against a different version of itself.
+      # Here we simply make that second reference point to ourselves.
+      for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other $installName $file
+      done
+    done
+  '';
+
+  postInstall = ''
+    mkdir -p "$dev/include"
+    install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
+  '';
+
+  passthru = {
+    libName = "c++abi";
+  };
+
+  meta = llvm_meta // {
+    homepage = "https://libcxxabi.llvm.org/";
+    description = "Provides C++ standard library support";
+    longDescription = ''
+      libc++abi is a new implementation of low level support for a standard C++ library.
+    '';
+    # "All of the code in libc++abi is dual licensed under the MIT license and
+    # the UIUC License (a BSD-like license)":
+    license = with lib.licenses; [ mit ncsa ];
+    maintainers = llvm_meta.maintainers ++ [ lib.maintainers.vlstill ];
+  };
+}