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FTBFS in MSYS2 LLVM based environments #9262

@kmilos

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@kmilos

It seems the new common Mode.c library in Pillow 12.0.0 fails to build OOTB in MSYS2 LLVM based environments like CLANG64/CLANGARM64:

https://github.com/msys2/MINGW-packages/actions/runs/18555260796/job/52891070931?pr=25966#step:10:466

It does build in MSYS2 GCC based environments like UCRT64/MINGW64:

https://github.com/msys2/MINGW-packages/actions/runs/18555260796/job/52891070947?pr=25966#step:10:464

The Pillow CI covers MINGW64 only.

Originally posted by @kmilos in #9256 (comment)

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