mold: fatal: could not open plugin file: Cannot open "/usr/bin/../lib/LLVMgold.so"

[rozhuk-im]

This happen on FreeBSD 13 amd64 during try to build svt-av1 with LTO.
There is no LLVMgold.so in system and system clang/ld work without this.

I suppose mold should not fail and silently ignore this.

[rui314]

I don't think this is a bug of mold. That path is not hardcoded to mold, so someone must be passing to the linker in your environment.

[rozhuk-im]

clang do that, IMHO.
cc call linker, ld from clang does not fail on LLVMgold.so miss.
mold threat this as error and does not work.

FAILED: /tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Bin/Release/libSvtAv1Dec.so.0.8.7 
: && /usr/local/libexec/ccache/cc -fPIC -fno-stack-clash-protection -Wall -Wextra -Wformat -Wformat-security -O2 -pipe -O3 -pipe -funroll-loops -mretpoline  -fstack-protector-strong -fno-strict-aliasing  -fdebug-prefix-map=/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847=. -fstack-protector-strong -mno-avx -O2 -pipe -O3 -pipe -funroll-loops -mretpoline  -fstack-protector-strong -fno-strict-aliasing  -fdebug-prefix-map=/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847=. -flto=thin  '-fuse-ld=mold' -fstack-protector-strong -shared -Wl,-soname,libSvtAv1Dec.so.0 -o /tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Bin/Release/libSvtAv1Dec.so.0.8.7 Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBitstreamUnit.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBlend_a64_mask.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBlockStructures.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbCabacContextModel.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbCdef.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbDeblockingCommon.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbInterPrediction.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbIntraPrediction.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbInvTransforms.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbLog.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbMalloc.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbMcp.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbPictureBufferDesc.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbPictureOperators.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbRestoration.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSegmentationParams.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSuperRes.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSystemResourceManager.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbThreads.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbTime.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbUtility.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbWarpedMotion.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/common_dsp_rtcd.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/convolve.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/grainSynthesis.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/fast.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/fast_9.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/nonmax.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbBlend_a64_mask_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbInterPrediction_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbIntraPrediction_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbPackUnPack_C.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbPictureOperators_C.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/cfl_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/filterintra_c.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbAvcStyleMcp_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbDeblockingFilter_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbIntraPrediction_AV1_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPackUnPack_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPictureOperators_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/convolve_2d_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_intrapred_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_subtract_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/jnt_convolve_2d_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/jnt_convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/wiener_convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/intrapred_sse2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPictureOperators_SSE2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_intrapred_sse2_.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/aom_subpixel_8t_sse2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/subtract_sse2.asm.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/EbHighbdIntraPrediction_Intrinsic_SSSE3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_8t_intrin_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/av1_inv_txfm_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_convolve_2d_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_wiener_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/intrapred_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/jnt_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/reconinter_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_bilinear_ssse3.asm.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_8t_ssse3.asm.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbBlend_a64_mask_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbIntraPrediction16bit_Intrinsic_SSE4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbPictureOperators_Intrinsic_SSE4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/av1_convolve_scale_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/cdef_block_sse4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/filterintra_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_convolve_2d_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_inv_txfm_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_jnt_convolve_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/reconinter_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/selfguided_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/warp_plane_sse4.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbBlend_a64_mask_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbHighbdIntraPrediction_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbInterPredictionCom_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbIntraPrediction_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbPackUnPack_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbPictureOperators_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/aom_subpixel_8t_intrin_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/av1_inv_txfm_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/cdef_block_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/cfl_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_inv_txfm_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_jnt_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_warp_affine_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/jnt_convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/jnt_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/selfguided_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/warp_plane_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/wiener_convolve_avx2.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/EbHighbdIntraPrediction_AVX512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/EbPictureOperators_Intrinsic_AVX512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/cdef_block_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/convolve_2d_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/convolve_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/highbd_inv_txfm_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/jnt_convolve_2d_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/jnt_convolve_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/wiener_convolve_avx512.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/init.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/api.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/x86_init.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/vendor.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/isa.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/bsd/init.c.o third_party/cpuinfo/deps/clog/CMakeFiles/clog.dir/src/clog.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecBitstream.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecBitstreamUnit.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecCdef.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecHandle.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecInterPrediction.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecIntraPrediction.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecInverseQuantize.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecLF.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecMemInit.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecNbr.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecObmc.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseFrame.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseHelper.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseInterBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseObu.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecPicMgr.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcess.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcessBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcessFrame.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecRestoration.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecSuperRes.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecUtils.c.o -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/C_DEFAULT   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/Codec   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Decoder/Codec   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/third_party/fastfeat   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE2   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSSE3   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE4_1   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX2   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX512 -Wl,-rpath,/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/C_DEFAULT:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/Codec:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Decoder/Codec:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/third_party/fastfeat:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE2:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSSE3:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE4_1:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX2:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX512:  -lm  -lpthread && :
mold: fatal: could not open plugin file: Cannot open "/usr/bin/../lib/LLVMgold.so"
cc: error: linker command failed with exit code 1 (use -v to see invocation)

[rui314]

Even if lld completely ignores the -plugin option, specifying a nonexistent file as a linker plugin is a bug of clang. Please report it to FreeBSD clang package.

[rozhuk-im]

This is clang specific, not FreeBSD.

You can find this in llvm upstream: clang/lib/Driver/ToolChains/CommonArgs.cpp

...
void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
                          ArgStringList &CmdArgs, const InputInfo &Output,
                          const InputInfo &Input, bool IsThinLTO) {
  const char *Linker = Args.MakeArgString(ToolChain.GetLinkerPath());
  const Driver &D = ToolChain.getDriver();
  if (llvm::sys::path::filename(Linker) != "ld.lld" &&
      llvm::sys::path::stem(Linker) != "ld.lld") {
    // Tell the linker to load the plugin. This has to come before
    // AddLinkerInputs as gold requires -plugin to come before any -plugin-opt
    // that -Wl might forward.
    CmdArgs.push_back("-plugin");

#if defined(_WIN32)
    const char *Suffix = ".dll";
#elif defined(__APPLE__)
    const char *Suffix = ".dylib";
#else
    const char *Suffix = ".so";
#endif

    SmallString<1024> Plugin;
    llvm::sys::path::native(
        Twine(D.Dir) + "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" + Suffix,
        Plugin);
    CmdArgs.push_back(Args.MakeArgString(Plugin));
  }

  // Try to pass driver level flags relevant to LTO code generation down to
  // the plugin.

  // Handle flags for selecting CPU variants.
  std::string CPU = getCPUName(Args, ToolChain.getTriple());
  if (!CPU.empty())
    CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-opt=mcpu=") + CPU));
...

So LTO should be broken on linux too then clang used.

[rui314]

No, it's actually a FreeBSD's clang package issue. LTO works on Linux with Clang. The problem is that FreeBSD's Clang doesn't ship with LLVMgold.so.

[rozhuk-im]

You assume that LLVMgold.so should exist, this is not correct, it is an option that enabled by some maintainer on your linux distro.
I can build clang from ports and there is an option to enable/disable this and many other things.

CLang have workaround for this then ld.lld is used.

[rui314]

We do not assume that LLVMgold.so always exists. We assume that whatever file explicitly given as an argument for -plugin exists, which is a reasonable behavior. There's no point for a compiler driver to specify a nonexistent path as an argument for -plugin. Instead of letting a compiler driver to pass an erroneous command line parameter and letting a linker to ignore it, we should fix it on the producer side.

[ishitatsuyuki]

FWIW, The reason lld doesn't get -plugin is because it has clang LTO support built-in, as a part of the LLVM umbrella. It's not a "workaround".

[rozhuk-im]

I made patch to llvm, rebuild and reinstall it:

diff --git a/contrib/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp b/contrib/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 8f9244cae8d..a91b4312947 100644
--- a/contrib/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/contrib/llvm-project/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -490,8 +490,6 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
     // Tell the linker to load the plugin. This has to come before
     // AddLinkerInputs as gold requires -plugin to come before any -plugin-opt
     // that -Wl might forward.
-    CmdArgs.push_back("-plugin");
-
 #if defined(_WIN32)
     const char *Suffix = ".dll";
 #elif defined(__APPLE__)
@@ -504,6 +502,9 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
     llvm::sys::path::native(
         Twine(D.Dir) + "/../lib" CLANG_LIBDIR_SUFFIX "/LLVMgold" + Suffix,
         Plugin);
+    if (!llvm::sys::fs::exists(Plugin))
+        return;
+    CmdArgs.push_back("-plugin");
     CmdArgs.push_back(Args.MakeArgString(Plugin));
   }
 

now I get:

FAILED: /tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Bin/Release/libSvtAv1Dec.so.0.8.7 
: && /usr/local/libexec/ccache/cc -fPIC -fno-stack-clash-protection -Wall -Wextra -Wformat -Wformat-security -O2 -pipe -O3 -pipe -funroll-loops -mretpoline  -fstack-protector-strong -fno-strict-aliasing  -fdebug-prefix-map=/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847=. -fstack-protector-strong -mno-avx -O2 -pipe -O3 -pipe -funroll-loops -mretpoline  -fstack-protector-strong -fno-strict-aliasing  -fdebug-prefix-map=/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847=. -flto=thin  '-fuse-ld=mold' -fstack-protector-strong -shared -Wl,-soname,libSvtAv1Dec.so.0 -o /tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Bin/Release/libSvtAv1Dec.so.0.8.7 Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBitstreamUnit.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBlend_a64_mask.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBlockStructures.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbCabacContextModel.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbCdef.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbDeblockingCommon.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbInterPrediction.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbIntraPrediction.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbInvTransforms.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbLog.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbMalloc.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbMcp.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbPictureBufferDesc.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbPictureOperators.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbRestoration.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSegmentationParams.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSuperRes.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbSystemResourceManager.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbThreads.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbTime.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbUtility.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbWarpedMotion.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/common_dsp_rtcd.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/convolve.c.o Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/grainSynthesis.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/fast.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/fast_9.c.o third_party/fastfeat/CMakeFiles/FASTFEAT.dir/nonmax.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbBlend_a64_mask_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbInterPrediction_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbIntraPrediction_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbPackUnPack_C.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/EbPictureOperators_C.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/cfl_c.c.o Source/Lib/Common/C_DEFAULT/CMakeFiles/COMMON_C_DEFAULT.dir/filterintra_c.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbAvcStyleMcp_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbDeblockingFilter_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbIntraPrediction_AV1_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPackUnPack_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPictureOperators_Intrinsic_SSE2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/convolve_2d_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_intrapred_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_subtract_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/jnt_convolve_2d_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/jnt_convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/wiener_convolve_sse2.c.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/intrapred_sse2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/EbPictureOperators_SSE2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/highbd_intrapred_sse2_.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/aom_subpixel_8t_sse2.asm.o Source/Lib/Common/ASM_SSE2/CMakeFiles/COMMON_ASM_SSE2.dir/subtract_sse2.asm.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/EbHighbdIntraPrediction_Intrinsic_SSSE3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_8t_intrin_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/av1_inv_txfm_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_convolve_2d_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/highbd_wiener_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/intrapred_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/jnt_convolve_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/reconinter_ssse3.c.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_bilinear_ssse3.asm.o Source/Lib/Common/ASM_SSSE3/CMakeFiles/COMMON_ASM_SSSE3.dir/aom_subpixel_8t_ssse3.asm.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbBlend_a64_mask_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbIntraPrediction16bit_Intrinsic_SSE4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/EbPictureOperators_Intrinsic_SSE4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/av1_convolve_scale_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/cdef_block_sse4_1.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/filterintra_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_convolve_2d_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_inv_txfm_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/highbd_jnt_convolve_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/reconinter_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/selfguided_sse4.c.o Source/Lib/Common/ASM_SSE4_1/CMakeFiles/COMMON_ASM_SSE4_1.dir/warp_plane_sse4.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbBlend_a64_mask_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbHighbdIntraPrediction_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbInterPredictionCom_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbIntraPrediction_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbPackUnPack_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/EbPictureOperators_Intrinsic_AVX2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/aom_subpixel_8t_intrin_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/av1_inv_txfm_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/cdef_block_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/cfl_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_inv_txfm_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_jnt_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/highbd_warp_affine_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/jnt_convolve_2d_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/jnt_convolve_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/selfguided_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/warp_plane_avx2.c.o Source/Lib/Common/ASM_AVX2/CMakeFiles/COMMON_ASM_AVX2.dir/wiener_convolve_avx2.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/EbHighbdIntraPrediction_AVX512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/EbPictureOperators_Intrinsic_AVX512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/cdef_block_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/convolve_2d_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/convolve_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/highbd_inv_txfm_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/jnt_convolve_2d_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/jnt_convolve_avx512.c.o Source/Lib/Common/ASM_AVX512/CMakeFiles/COMMON_ASM_AVX512.dir/wiener_convolve_avx512.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/init.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/api.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/x86_init.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/vendor.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/isa.c.o third_party/cpuinfo/CMakeFiles/cpuinfo.dir/src/x86/bsd/init.c.o third_party/cpuinfo/deps/clog/CMakeFiles/clog.dir/src/clog.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecBitstream.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecBitstreamUnit.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecCdef.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecHandle.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecInterPrediction.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecIntraPrediction.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecInverseQuantize.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecLF.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecMemInit.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecNbr.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecObmc.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseFrame.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseHelper.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseInterBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecParseObu.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecPicMgr.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcess.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcessBlock.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecProcessFrame.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecRestoration.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecSuperRes.c.o Source/Lib/Decoder/CMakeFiles/SvtAv1Dec.dir/Codec/EbDecUtils.c.o -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/C_DEFAULT   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/Codec   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Decoder/Codec   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/third_party/fastfeat   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE2   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSSE3   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE4_1   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX2   -L/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX512 -Wl,-rpath,/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/C_DEFAULT:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/Codec:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Decoder/Codec:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/third_party/fastfeat:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE2:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSSE3:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_SSE4_1:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX2:/tmp/ports/usr/ports/multimedia/svt-av1/work/SVT-AV1-6e24fb7f5f7438bb04061dc1a159f0c5b882d847/Source/Lib/Common/ASM_AVX512:  -lm  -lpthread && :
mold: fatal: Source/Lib/Common/Codec/CMakeFiles/COMMON_CODEC.dir/EbBitstreamUnit.c.o: don't know how to handle this LTO object file because no -plugin option was given. Please make sure you added -flto not only for creating object files but also for creating the final executable.
cc: error: linker command failed with exit code 1 (use -v to see invocation)

PS: then I create symlynk to LLVMgold.so (llvm13 installed from ports with this plugin, base llvm is 13 too) then it link in single thread, do not see performace grow.

[ishitatsuyuki]

1. You can't do LTO in non-LLD linkers without the plugin. If you pass -flto, you need LLVMgold.so.
2. If you are using -flto (and not -flto=thin) then the bulk of time is spent inside the compiler code doing single-threaded Link-Time Optimization. mold cannot make this magically fast. For parallel LTO, look for ThinLTO.

[rozhuk-im]

I am right that it: "work as intended" / "not a bug" ?

LTO enabled on build system side, clang add LLVMgold.so, mold fail because no LLVMgold.so.
In any way mold requires plugin to handle LTO.

[rui314]

You are right. mold is working as intended. Any linker other than lld can't do LTO without the linker plugin file. (On the other hand, lld can't do LTO with a linker plugin, so it can't do LTO with any compilers other than clang.)

[rui314]

Please file a bug to FreeBSD clang package so that

• if LLVMgold.so is missing, do not pass it as an argument for -plugin, and
• include LLVMgold.so into the FreeBSD's clang package.

[rozhuk-im]

1. clang is a part of system
2. LLVMgold.so not included because of incompatible license
3. Clang pass -plugin LLVMgold.so if LTO is enabled, if use patch to prevent this then build will fail.
4. Better to document this case some where in mold man/docs/faq, it is clang specific, not FreeBSD.

[rui314]

As I said, this is a problem of clang that invokes a linker with a bad parameter. It is not a linker but clang who should print out an error message if -flto is passed but the linker is not ld.lld and there's no LLVMgold.so. This problem is not specific to mold; you should get the same error for any linker other than ld.lld (e.g. GNU ld).

[rui314]

I recommended you report this issue to FreeBSD because they need a user input to fix the issue once and for all. There's actually a fix to this issue which I made in May (https://reviews.llvm.org/D125624), but there's no progress because there's no one who pushed it other than me. Your problem cannot be solved by filing a bug to mold and pushing me to do something. Please file bugs to FreeBSD and Clang instead and ask them to solve the problem for you.