This issue typically arises during the configuration phase of a build where Google Benchmark is expected as a dependency for running microbenchmarks, but the build system cannot locate the source code or the instructions on how to fetch it. Why is this happening?
The error "no download info given" means CMake has been told that a project named google-benchmark-libcxx exists, but the necessary parameters (like GIT_REPOSITORY , URL , or SOURCE_DIR ) are missing. This usually happens for one of three reasons: This issue typically arises during the configuration phase
The error is essentially a "file not found" error for the build system. By ensuring the llvm-project/third-party/benchmark directory is populated via Git submodules or by disabling the LIBCXX_INCLUDE_BENCHMARKS flag, you can move past this bottleneck and get back to your build. This usually happens for one of three reasons:
Troubleshooting the "No Download Info Given" Error for Google Benchmark in LLVM/libc++ but the necessary parameters (like GIT_REPOSITORY
You cloned the LLVM repository but didn't initialize the submodules that contain the benchmark source.