<div dir="ltr">You also need -DLIBUNWIND_USE_COMPILER_RT=ON -DLIBCXXABI_USE_LLVM_UNWINDER=ON. This is because you set <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">-DLIBCXXABI_USE_COMPILER_RT=ON so <span style="color:rgb(34,34,34);font-family:sans-serif;font-size:13px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">libc++abi.so is no longer being linked agains</span> libgcc_s.so which is where the unwinder otherwise comes from.</span></div><br><div class="gmail_quote"><div dir="ltr">On Sun, May 6, 2018 at 4:05 AM via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I try to compile LLVM, clang, lld and libcxx together in one source<br>
directory following the instructions on the website.<br>
I'm running Arch Linux and already have LLVM, clang, lld and libcxx<br>
installed (prebuilt against libstdc++). Now I want a "pure"<br>
llvm toolchain.<br>
<br>
The following options were used:<br>
-DBOOTSTRAP_LLVM_ENABLE_LLD<br>
-DCMAKE_C_COMPILER=clang<br>
-DCMAKE_CXX_COMPILER=clang++<br>
-DCMAKE_LINKER=lld<br>
-DCMAKE_LINK_EXECUTABLE="/usr/bin/ld.lld"<br>
-DCMAKE_AR="/usr/bin/llvm-ar"<br>
-DCMAKE_AS="/usr/bin/llvm-as"<br>
-DCLANG_DEFAULT_LINKER=lld<br>
-DCLANG_DEFAULT_RTLIB=compiler-rt<br>
-DCLANG_ENABLE_BOOTSTRAP=ON<br>
-DLIBCXX_USE_COMPILER_RT=ON<br>
-DLIBCXXABI_USE_COMPILER_RT=ON<br>
-DLLVM_ENABLE_LLD=ON<br>
-DLLVM_ENABLE_LIBCXX=ON<br>
<br>
However, the build fails with (many of those error messages):<br>
<br>
[1274/2712] Linking CXX shared library lib/libc++abi.so.1.0<br>
FAILED: lib/libc++abi.so.1.<br>
/usr/bin/ld.lld: error: undefined symbol: _Unwind_Resume<br>
>>> referenced by ld-temp.o<br>
>>>               lto.tmp:(__cxa_demangle)<br>
<br>
Can anyone please tell me what I am doing wrong and how I can fix the<br>
build?<br>
<br>
Regards<br>
Andreas<br>
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</blockquote></div>