ci: speed up Windows jobs by trimming the msys2 install - #354
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The msys2 package cache is already enabled by default and hits, but the slow part of the Windows jobs is pacman *extracting* the installed packages, which the cache does not avoid: on the windows-11-arm runner the install step alone took ~3.5 min installing base-devel and the full toolchain meta-package. Install only what openlibm builds with — make plus a C compiler. The -gcc packages pull in binutils and the runtime, so mingw64/mingw32/ucrt64 drop base-devel and the toolchain meta entirely. The clang environments keep their toolchain meta (no standalone binutils package provides ar), but still drop base-devel. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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mingw-w64-clang-*-clang requires lld and llvm-tools (which provides ar), so it is a complete toolchain by itself. Drop the clang -toolchain meta (lldb/openmp/flang/... are unused) to cut the slow windows-11-arm setup. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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The Windows jobs are slow in setup, not build. On the windows-11-arm
clangarm64job the steps were:The msys2 package cache is already enabled by default and hits (the log shows a 1.5 GB cache restore). The cost that remains is
pacmanextracting/installing the packages — ~3.5 min — which caching cannot avoid. We were installingbase-devel(≈150 packages: autotools, perl, …) plus the fullmingw-w64-*-toolchainmeta.This installs only what the build uses:
make+ a C compiler.mingw-w64-<env>-gccpulls in binutils + runtime, so they drop bothbase-develand the toolchain meta.ar/lld), but still dropbase-devel.Validated by the Windows CI on this PR (build +
make testgreen on all five environments).