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compat.glfw: the Win32 backend requires mcpp:c-abi=ucrt - #748
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… (mcpp:c-abi=ucrt) As the Linux row states glibc. The MSVC row, the MinGW-w64 payload and the mingw-w64-sysroot base (mcpp's mingw-llvm provider, on every host) answer it; a Windows identity whose C library is another (openkal-musl over openkal-windows) has no window system and is refused at resolution, naming the requirement, instead of failing in <windows.h>.
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The Windows row of
compat.glfwstates the C library its Win32 backend is written for, as the Linux row states glibc (mcpp SPEC-002 §2.2):mingw-w64-sysrootbase package (20261104-2 statesmcpp:c-abi=ucrt, mingw-w64-sysroot 20261104-2: the base states its C library as mcpp:c-abi=ucrt openxlings/xim-pkgindex#1135), which mcpp'smingw-llvmprovider supplies on every host, macOS and Linux aarch64 included ([Feature] macOS → x86_64-windows-gnu：缺的是 Win32 系统侧，且引擎指的两条逃生口都不通 mcpp-community/mcpp#913).x86_64-windows-musl) has no window system. It is now refused at resolution, naming the requirement, instead of failing in<windows.h>.Measured with mcpp 2026.11.10.1 (candidate) on linux-x86_64, the index taken from this branch:
--target x86_64-windows-gnu --toolchain llvm@23.1.3: builds.--target x86_64-windows-musl --toolchain llvm@23.1.3:error: glfw@3.4.0.1 requires the c-abi to be ucrt(musl from openkal-musl, graph).