<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/60158>60158</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Configuring runtimes fails on Ubuntu 20.04
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
oroppas
</td>
</tr>
</table>
<pre>
Hi,
Here's the error messages:
```
CMake Error at /home/ryuta/packages/llvm/llvm-project/llvm/cmake/modules/HandleLLVMOptions.cmake:322 (message):
Host compiler does not support '-fuse-ld=lld'
Call Stack (most recent call first):
CMakeLists.txt:157 (include)
-- Configuring incomplete, errors occurred!
See also "/home/ryuta/packages/llvm/build/runtimes/runtimes-bins/CMakeFiles/CMakeOutput.log".
See also "/home/ryuta/packages/llvm/build/runtimes/runtimes-bins/CMakeFiles/CMakeError.log".
FAILED: runtimes/runtimes-stamps/runtimes-configure /home/ryuta/packages/llvm/build/runtimes/runtimes-stamps/runtimes-configure
cd /home/ryuta/packages/llvm/build/runtimes/runtimes-bins && /usr/bin/cmake -DCMAKE_C_COMPILER=/home/ryuta/packages/llvm/build/./bin/clang -DCMAKE_CXX_COMPILER=/home/ryuta/packages/llvm/build/./bin/clang++ -DCMAKE_ASM_COMPILER=/home/ryuta/packages/llvm/build/./bin/clang -DCMAKE_LINKER=/home/ryuta/packages/llvm/build/./bin/ld.lld -DCMAKE_AR=/home/ryuta/packages/llvm/build/./bin/llvm-ar -DCMAKE_RANLIB=/home/ryuta/packages/llvm/build/./bin/llvm-ranlib -DCMAKE_NM=/home/ryuta/packages/llvm/build/./bin/llvm-nm -DCMAKE_OBJDUMP=/home/ryuta/packages/llvm/build/./bin/llvm-objdump -DCMAKE_OBJCOPY=/home/ryuta/packages/llvm/build/./bin/llvm-objcopy -DCMAKE_STRIP=/home/ryuta/packages/llvm/build/./bin/llvm-strip -DCMAKE_READELF=/home/ryuta/packages/llvm/build/./bin/llvm-readelf -DCMAKE_C_COMPILER_TARGET=aarch64-linux-gnu -DCMAKE_CXX_COMPILER_TARGET=aarch64-linux-gnu -DCMAKE_ASM_COMPILER_TARGET=aarch64-linux-gnu -DCMAKE_INSTALL_PREFIX=/home/ryuta/local -DLLVM_BINARY_DIR=/home/ryuta/packages/llvm/build -DLLVM_CONFIG_PATH=/home/ryuta/packages/llvm/build/bin/llvm-config -DLLVM_ENABLE_WERROR=OFF -DLLVM_HOST_TRIPLE=aarch64-linux-gnu -DLLVM_HAVE_LINK_VERSION_SCRIPT=1 -DLLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO=OFF -DLLVM_USE_RELATIVE_PATHS_IN_FILES=OFF -DLLVM_LIT_ARGS=-sv -DLLVM_SOURCE_PREFIX= -DPACKAGE_VERSION=16.0.0git -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja -DCMAKE_C_COMPILER_LAUNCHER= -DCMAKE_CXX_COMPILER_LAUNCHER= -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DCOMPILER_RT_BUILD_BUILTINS=Off -DLLVM_INCLUDE_TESTS=ON -DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-linux-gnu -DLLVM_ENABLE_PROJECTS_USED=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON -DLLVM_BUILD_TOOLS=ON -DCMAKE_C_COMPILER_WORKS=ON -DCMAKE_CXX_COMPILER_WORKS=ON -DCMAKE_ASM_COMPILER_WORKS=ON -DHAVE_LLVM_LIT=ON "-DLLVM_ENABLE_RUNTIMES=libunwind;libcxxabi;libcxx;compiler-rt" -DLLVM_USE_LINKER=lld -GNinja /home/ryuta/packages/llvm/llvm-project/llvm/runtimes/../../runtimes && /usr/bin/cmake -E touch /home/ryuta/packages/llvm/build/runtimes/runtimes-stamps/runtimes-configure
[1956/1960] Generating ../../../../include/flang/ieee_arithmetic.mod
ninja: build stopped: cannot make progress due to previous errors.
```
Despite ` Host compiler does not support '-fuse-ld=lld'`, inspecting `build/runtimes/runtimes-bins/CMakeFiles/CMakeError.log` reveals:
```
Source file was:
int main() { return 0; }
Performing C++ SOURCE FILE Test CXX_SUPPORTS_CUSTOM_LINKER failed with the following output:
Change Dir: /home/ryuta/packages/llvm/build/runtimes/runtimes-bins/CMakeFiles/CMakeScratch/TryCompile-YixDhp
Run Build Command(s):/usr/bin/ninja cmTC_a0eff && [1/2] Building CXX object CMakeFiles/cmTC_a0eff.dir/src.cxx.o
[2/2] Linking CXX executable cmTC_a0eff
FAILED: cmTC_a0eff
: && /home/ryuta/packages/llvm/build/./bin/clang++ --target=aarch64-linux-gnu -fuse-ld=lld CMakeFiles/cmTC_a0eff.dir/src.cxx.o -o cmTC_a0eff && :
ld.lld: error: unable to find library -lc++
ld.lld: error: cannot open /media/ryuta/TOSHIBA/packages/llvm/build/lib/clang/16/lib/linux/libclang_rt.builtins-aarch64.a: No such file or directory
ld.lld: error: cannot open /media/ryuta/TOSHIBA/packages/llvm/build/lib/clang/16/lib/linux/libclang_rt.builtins-aarch64.a: No such file or directory
clang-16: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
```
It appears the `build/bin/clang++` is unable to find `libc++`: `ld.lld: error: unable to find library -lc++`. Indeed, there is no `libc++.so*` under `build/lib`.
Here's how I configure:
```
cmake -G Ninja \
-B build \
-S llvm-project/llvm \
-DBUILD_SHARED_LIBS=ON \
-DCMAKE_INSTALL_PREFIX="$HOME/local" \
-DCMAKE_BUILD_TYPE=RelWithDebInfo \
-DCMAKE_C_COMPILER=/usr/bin/clang-12 \
-DCMAKE_CXX_COMPILER=/usr/bin/clang++-12 \
-DCMAKE_CUDA_COMPILER=/usr/local/cuda/bin/nvcc \
-DCMAKE_CUDA_HOST_COMPILER=/usr/bin/clang++-12 \
-DLLVM_CCACHE_BUILD=ON \
-DLLVM_DEFAULT_TARGET_TRIPLE="aarch64-linux-gnu" \
-DLLVM_HOST_TRIPLE="aarch64-linux-gnu" \
-DLLVM_TARGETS_TO_BUILD="AArch64;NVPTX;WebAssembly" \
-DLLVM_ENABLE_LIBCXX=ON \
-DLLVM_ENABLE_LLD=ON \
-DLLVM_ENABLE_LTO="Thin" \
-DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;libclc;lld;lldb;mlir;polly;pstl;flang" \
-DLLVM_ENABLE_RUNTIMES="libunwind;libcxxabi;libcxx;compiler-rt" \
-DLLVM_INSTALL_UTILS=ON \
-DCLANG_DEFAULT_CXX_STDLIB="libc++" \
-DCLANG_DEFAULT_LINKER="lld" \
-DCLANG_DEFAULT_RTLIB="compiler-rt" \
-DCLANG_DEFAULT_UNWINDLIB="libunwind" \
-DPython3_EXECUTABLE="$(which python)" \
|| exit 1
```
</pre>
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