[llvm-dev] Fwd: LLD (macOS) usage?

[Don Hinton via llvm-dev]

fyi.,..

$ ../llvm_project/build/cross/bin/clang -fuse-ld=lld -v -x c - </dev/null
clang version 7.0.0 (trunk 321948) (llvm/trunk 321947)
Target: x86_64-apple-darwin17.3.0
Thread model: posix
InstalledDir: /Users/dhinton/projects/misc/../llvm_project/build/cross/bin
 "/Users/dhinton/projects/llvm_project/build/cross/bin/clang-7.0" -cc1
-triple x86_64-apple-macosx10.13.0 -Wdeprecated-objc-isa-usage
-Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free
-main-file-name - -mrelocation-model pic -pic-level 2 -mthread-model posix
-mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu penryn
-dwarf-column-info -debugger-tuning=lldb -target-linker-version 305 -v
-resource-dir
/Users/dhinton/projects/llvm_project/build/cross/lib/clang/7.0.0
-fdebug-compilation-dir /Users/dhinton/projects/misc -ferror-limit 19
-fmessage-length 208 -stack-protector 1 -fblocks
-fencode-extended-block-signature -fobjc-runtime=macosx-10.13.0
-fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o
/var/folders/c6/9lj3yxp109s0p6ch4jhcw5h00000gn/T/--1c2f9c.o -x c -
clang -cc1 version 7.0.0 based upon LLVM 7.0.0svn default target
x86_64-apple-darwin17.3.0
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /Users/dhinton/projects/llvm_project/build/cross/lib/clang/7.0.0/include
 /usr/include
 /System/Library/Frameworks (framework directory)
 /Library/Frameworks (framework directory)
End of search list.
 "/Users/dhinton/projects/misc/../llvm_project/build/cross/bin/ld64.lld"
-demangle -lto_library
/Users/dhinton/projects/llvm_project/build/cross/lib/libLTO.dylib
-no_deduplicate -dynamic -arch x86_64 -macosx_version_min 10.13.0 -o a.out
/var/folders/c6/9lj3yxp109s0p6ch4jhcw5h00000gn/T/--1c2f9c.o -lSystem
warning: ignoring unknown argument: -no_deduplicate
warning: -sdk_version is required when emitting min version load command.
Setting sdk version to match provided min version
Unable to find library for -lto_library
clang-7.0: error: linker command failed with exit code 1 (use -v to see
invocation)

On Sun, Jan 7, 2018 at 10:18 PM, Shoaib Meenai via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> I believe what's happening here is that clang translates the -fuse-ld=lld
> into calling the ld.lld executable, which is actually the ELF LLD linker,
> not the Mach-O one. On 6.0, the Mach-O linker symlink is called ld64.lld
> instead (and clang has been changed to call out to that name) to
> disambiguate the two. For 5.0, I'm not sure how best to force the Mach-O
> linker (I'm not familiar with how the distribution is laid out).
>
>
>
> As Saleem said though, Mach-O LLD isn't really ready yet, so you're better
> off using ld64 (the default linker).
>
>
>
> *From: *llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Julio
> César Rocha via llvm-dev <llvm-dev at lists.llvm.org>
> *Reply-To: *Julio César Rocha <julioc.rocha at gmail.com>
> *Date: *Sunday, January 7, 2018 at 7:17 AM
> *To: *"llvm-dev at lists.llvm.org" <llvm-dev at lists.llvm.org>
> *Subject: *[llvm-dev] Fwd: LLD (macOS) usage?
>
>
>
> 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
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__llvm.org_docs&d=DwMFaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=o3kDXzdBUE3ljQXKeTWOMw&m=u7AStivTiQUkhMKu66ZUkCBZPZEq4EYZ0fP-0tIofUw&s=KYkQl_-tlad-fETHEsTQO9QhksIQ7vvHuBrL_1DXAQw&e=>
> .
>
>
>
> Please help?
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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