[lld-macho] -lto-embed-bitcode=optimized causes report_fatal_error

[elite-sheep]

Platform: MacOS with Rosette 2.
LLVM version: 13, installed with homebrew
I tried the bitcode embedding for clang. I have a very simple hello world c++ code and it happens that lld cannot recognize this flag. Can anyone help with this?

I get the idea from here: https://reviews.llvm.org/rGc8e0bb3b2c24ef59556d81a275fb1f5db64899d3

Error log:

/usr/local/opt/llvm/bin/clang++ -fuse-ld=lld -flto -Wl,--plugin-opt=-lto-embed-bitcode=optimized test.cpp 
ld64.lld: error: unknown argument '--plugin-opt=-lto-embed-bitcode=optimized'
ld64.lld: error: cannot create /var/folders/t4/qwff9y8x17v323mm2m9k6bcr0000gn/T/cc-06e1f2.o/0.x86_64.lto.o: Not a directory
LLVM ERROR: IO failure on output stream: Bad file descriptor
PLEASE submit a bug report to https://github.com/Homebrew/homebrew-core/issues and include the crash backtrace.
Stack dump:
0.	Program arguments: /usr/local/opt/llvm/bin/ld64.lld -demangle -object_path_lto /var/folders/t4/qwff9y8x17v323mm2m9k6bcr0000gn/T/cc-06e1f2.o -no_deduplicate -dynamic -arch x86_64 -platform_version macos 12.0.0 12.0.0 -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk -o a.out --plugin-opt=-lto-embed-bitcode=optimized /var/folders/t4/qwff9y8x17v323mm2m9k6bcr0000gn/T/test-8b2272.o -lc++ -lSystem /usr/local/Cellar/llvm/13.0.1_1/lib/clang/13.0.1/lib/darwin/libclang_rt.osx.a
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  libLLVM.dylib            0x0000000113e1e1a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 40
1  libLLVM.dylib            0x0000000113e1e798 SignalHandler(int) + 248
2  libsystem_platform.dylib 0x00007ff816ccadfd _sigtramp + 29
3  libsystem_platform.dylib 0x0000000000000001 _sigtramp + 18446603370198422049
4  libsystem_c.dylib        0x00007ff816c00d24 abort + 123
5  libLLVM.dylib            0x0000000113d6a875 llvm::report_fatal_error(llvm::Twine const&, bool) + 277
6  libLLVM.dylib            0x0000000116a8943d llvm::report_fatal_error(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, bool) + 29
7  libLLVM.dylib            0x0000000113df98c6 llvm::raw_fd_ostream::~raw_fd_ostream() + 214
8  lld                      0x000000010443fdba lld::saveBuffer(llvm::StringRef, llvm::Twine const&) + 506
9  lld                      0x00000001047174a8 lld::macho::BitcodeCompiler::compile() + 1544
10 lld                      0x00000001046eeb2c lld::macho::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&, llvm::raw_ostream&) + 25452
11 lld                      0x000000010442ddc4 lldMain(int, char const**, llvm::raw_ostream&, llvm::raw_ostream&, bool) + 820
12 lld                      0x000000010442d900 main + 208
13 dyld                     0x0000000204cf251e start + 462
14 dyld                     0x0000000000000003 start + 18446744065038933171
clang-13: error: unable to execute command: Abort trap: 6
clang-13: error: linker command failed due to signal (use -v to see invocation)

[llvmbot]

@llvm/issue-subscribers-lld-macho

[BertalanD]

The IO failure will be fixed by https://reviews.llvm.org/D129705.

The --plugin-opt= option is specific to the ELF lld. With ld64.lld, the -mllvm option can be used for passing options to the LTO backend. Thus, the flag passed to Clang would look like -Wl,-mllvm,-lto-embed-bitcode=optimized.