[llvm-dev] Cannot compile LLVM suite with clang+lld

[Petr Hosek via llvm-dev]

You also need -DLIBUNWIND_USE_COMPILER_RT=ON
-DLIBCXXABI_USE_LLVM_UNWINDER=ON. This is because you set
-DLIBCXXABI_USE_COMPILER_RT=ON
so libc++abi.so is no longer being linked agains libgcc_s.so which is where
the unwinder otherwise comes from.

On Sun, May 6, 2018 at 4:05 AM via llvm-dev <llvm-dev at lists.llvm.org> wrote:

> I try to compile LLVM, clang, lld and libcxx together in one source
> directory following the instructions on the website.
> I'm running Arch Linux and already have LLVM, clang, lld and libcxx
> installed (prebuilt against libstdc++). Now I want a "pure"
> llvm toolchain.
>
> The following options were used:
> -DBOOTSTRAP_LLVM_ENABLE_LLD
> -DCMAKE_C_COMPILER=clang
> -DCMAKE_CXX_COMPILER=clang++
> -DCMAKE_LINKER=lld
> -DCMAKE_LINK_EXECUTABLE="/usr/bin/ld.lld"
> -DCMAKE_AR="/usr/bin/llvm-ar"
> -DCMAKE_AS="/usr/bin/llvm-as"
> -DCLANG_DEFAULT_LINKER=lld
> -DCLANG_DEFAULT_RTLIB=compiler-rt
> -DCLANG_ENABLE_BOOTSTRAP=ON
> -DLIBCXX_USE_COMPILER_RT=ON
> -DLIBCXXABI_USE_COMPILER_RT=ON
> -DLLVM_ENABLE_LLD=ON
> -DLLVM_ENABLE_LIBCXX=ON
>
> However, the build fails with (many of those error messages):
>
> [1274/2712] Linking CXX shared library lib/libc++abi.so.1.0
> FAILED: lib/libc++abi.so.1.
> /usr/bin/ld.lld: error: undefined symbol: _Unwind_Resume
> >>> referenced by ld-temp.o
> >>>               lto.tmp:(__cxa_demangle)
>
> Can anyone please tell me what I am doing wrong and how I can fix the
> build?
>
> Regards
> Andreas
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> llvm-dev at lists.llvm.org
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>
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