Build fails with Ninja Multi-Config generator

[RougherO]

Trying to build llvm 20.1.8 using Ninja Multi-Config as generator fails with error:

FAILED: Debug/lib/Debug/libbenchmark_main.so.0.0.0 
: && /usr/bin/clang++ -fPIC -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections  -Wall  -Wextra  -Wshadow  -Wfloat-equal  -Wold-style-cast  -Wsuggest-override  -pedantic  -pedantic-errors  -Wshorten-64-to-32  -fstrict-aliasing  -Wno-deprecated-declarations  -fno-exceptions  -Wstrict-aliasing  -Wthread-safety -g  -Wl,-z,defs -Wl,-z,nodelete -fuse-ld=lld -Wl,--color-diagnostics -Xlinker --dependency-file=third-party/benchmark/src/CMakeFiles/benchmark_main.dir/Debug/link.d -shared -Wl,-soname,libbenchmark_main.so.0 -o "\${CONFIGURATION}/lib/Debug/libbenchmark_main.so.0.0.0" third-party/benchmark/src/CMakeFiles/benchmark_main.dir/Debug/benchmark_main.cc.o  -Wl,-rpath,"/home/roughero/Programming/Cpp/llvm-tutorial/LLVM/llvm/build_temp/\${CONFIGURATION}/lib/Debug"  "Debug/lib/Debug/libbenchmark.so.0.0.0" && :
clang++: error: no such file or directory: 'Debug/lib/Debug/libbenchmark.so.0.0.0'

Build command:

$ cmake -DBUILD_SHARED_LIBS=ON -DCMAKE_C_COMPILER=clang \
    -DCMAKE_CXX_COMPILER=clang++ -DLLVM_BUILD_TESTS=ON \
    -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_OPTIMIZED_TABLEGEN=ON \
    -DLLVM_ENABLE_PROJECTS=clang -DLLVM_USE_LINKER=lld \
    -DLLVM_USE_SPLIT_DWARF=ON -G "Ninja Multi-Config" \
    -B build_temp

I have a preinstalled clang from pacman:

clang version 20.1.7
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin