[llvm-dev] LLD (macOS) usage?

Saleem Abdulrasool via llvm-dev llvm-dev at lists.llvm.org
Sun Jan 7 10:37:25 PST 2018


MachO support in lld is not really ready for real world usage.  It was able to bootstrap itself a couple of years ago, but, it has not really been maintained or further developed since.  I would recommend that you use ld64 if you are intending to build MachO binaries.

> On Jan 7, 2018, at 9:57 AM, Don Hinton via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> I'm seeing something similar.  
> 
> clang is using HOST_LINK_VERSION, obtained from ld64, as the default for -mlinker-version.  This causes Darwin.cpp to add the arguments you are seeing, but not handled by lld.  Perhaps -fuse-ld should be considered in addition to -mlinker-version when adding these arguments.
> 
> As a workaround, you can try passing -mlinker-version.  Looks like anything < 133 will work, including 0.
> 
> hth...
> don
> 
> 
> 
> On Thu, Jan 4, 2018 at 1:14 AM, Julio C├ęsar Rocha via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> Hi. I'm using LLVM 5.0.1 on macOS 10.12.
> 
> I have a very simple program (program.c):
> int main() {}
> 
> When attempting to compile with LLD, I get this output:
> $ clang -fuse-ld=lld program.c
> /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -no_deduplicate
> /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -dynamic
> /opt/llvm/5.0.1/bin/ld.lld: error: unknown argument: -arch
> /opt/llvm/5.0.1/bin/ld.lld: error: unknown emulation: acosx_version_min
> /opt/llvm/5.0.1/bin/ld.lld: error: unable to find library -lto_library
> /opt/llvm/5.0.1/bin/ld.lld: error: /opt/llvm/5.0.1/lib/libLTO.dylib: invalid data encoding
> clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> Looks like the flags passed to the linker are just wrong, but can't find any relevant documentation at llvm.org/docs <http://llvm.org/docs>.
> 
> Please help?
> 
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