gcc -O0 keeps unused cst_test_util.h helpers that need os_*; clang GC'd them so only the gcc CMake step failed. Prefer ghfast/ghproxy.net for the llvm-mingw tarball (gitclone 500 / github unreachable on the runner).
gcc -O0 keeps unused cst_test_util.h helpers that need os_*; clang GC'd them so only the gcc CMake step failed. Prefer ghfast/ghproxy.net for the llvm-mingw tarball (gitclone 500 / github unreachable on the runner).