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msys2: clang toolchain for CLANG64 / CLANGARM64 - #8588
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MINGW64 is no longer supported (openframeworks#8589); the MSYS2 build task, include paths and compiler now use UCRT64.
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MSYS2's CLANG64 and CLANGARM64 (Windows on ARM) environments ship clang and LLVM tools, but not gcc or GNU binutils.
config.msys2.default.mkhardcoded$(MINGW_PREFIX)/bin/gccandg++, so make failed straight away in those shells.scripts/msys2/install_dependencies.shalready installsclangfor both environments.config.msys2.default.mk: whenMSYSTEMisCLANG64orCLANGARM64, useclang/clang++, andllvm-ar/llvm-windreswhen present (falling back toar/windres). UCRT64 and MINGW64 are unchanged.c_cpp_properties.json(Win32): replace the non-existentC:/msys64/mingw64/i686-w64-mingw64/includewithC:/msys64/mingw64/include, which is where the MSYS2 package headers (glfw, cairo, curl…) live.This pairs with openframeworks/projectGenerator#648, which lets PG generate msys2 / VS Code projects for UCRT64, MINGW64, CLANG64 or CLANGARM64.
The toolchain selection was checked by evaluating the makefile with each
MSYSTEM. I haven't compiled on a Windows / Windows-on-ARM machine yet.