ci: drop boost from 32-bit mingw32 install#6091
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MSYS2 removed the mingw-w64-i686-boost package (32-bit i686 is being phased out), so the mingw32 matrix entry now fails at the pacman install step with "target not found: mingw-w64-i686-boost". Boost is optional test coverage (boost::optional / boost::variant casters, gated behind PYBIND11_TEST_BOOST); without it those tests are skipped and the rest of the job builds and runs normally. Move boost to the mingw64 extra_install so the 64-bit job keeps that coverage. Assisted-by: ClaudeCode:claude-opus-4.8
henryiii
commented
Jun 16, 2026
virtuald
approved these changes
Jun 17, 2026
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Problem
The
🐍 3 • windows-latest • mingw32CI job started failing at the dependency-install step:MSYS2 has dropped the
mingw-w64-i686-boostpackage (32-bit i686 is being phased out), so the install fails before anything is built. This affectsmasterand every open PR — the last greenmingw32run onmasterpredates the package removal.Fix
Boost is optional test coverage:
tests/CMakeLists.txtdoesfind_package(Boost 1.56)and only definesPYBIND11_TEST_BOOST(enabling theboost::optional/boost::variantcaster tests) when it's found. Without it, those tests are skipped and the rest of the job builds and runs normally.This drops
boostfrom the shared install list and addsmingw-w64-x86_64-boostto the mingw64extra_install, so: