Fix CI failures from updated runner images (deriveConstants, ld warnings)#180
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The macOS-13 GitHub Actions runner now ships with Homebrew llvm@18, whose libunwind triggers a linker warning on every invocation: ld: warning: reexported library with install name '/usr/local/opt/llvm@18/lib/libunwind.1.dylib' ... couldn't be matched with any parent library and will be linked directly This causes ~190 spurious test failures (bad stderr / stderr mismatch) on the Mac x86_64 CI. Filter the warning in both normalise_errmsg and normalise_output, alongside the existing macOS ld warning patterns.
Recent macOS and Windows CI runner images set CC to include flags (e.g. "/usr/bin/cc -std=gnu23"). The --gcc-program argument was passed directly to rawSystem which treats the entire string as an executable path, causing: deriveConstants: /usr/bin/cc -std=gnu23: rawSystem: posix_spawnp: does not exist (No such file or directory) Split the --gcc-program value on whitespace: the first word becomes the program path, remaining words are prepended to the gcc flags.
angerman
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This was referenced Apr 4, 2026
On Windows (MSYS2/CLANG64), the _utime function expects a struct _utimbuf pointer. The CUtimbuf CTYPE was declared as "struct utimbuf" which worked when clang treated them as compatible, but with -std=gnu23 (now the default on updated CI runner images) clang errors on the type mismatch: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' Use the correct Windows type name in the CTYPE pragma.
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Summary
Fixes CI build/test failures caused by updated GitHub Actions runner images.
CCto"/usr/bin/cc -std=gnu23".deriveConstantspassed the entire string torawSystemas an executable path, failing on Mac x86_64, Mac aarch64, and Windows.struct _utimbufon Windows — With-std=gnu23, clang on MSYS2/CLANG64 now errors on the type mismatch betweenstruct utimbuf(POSIX) andstruct _utimbuf(Windows_utimeparameter). Use the correct Windows type name in the CTYPE pragma.llvm@18, whoselibunwindtriggers a linker warning on everyldinvocation, causing ~190 spurious test stderr mismatches onTest binary (Mac x86_64).Test plan
Test binary (Mac x86_64)passes (reexported library warning filtered)ghc-internalcompiles without-Wincompatible-pointer-typeserror