On Tue, 9 Sep 2025, Mark Liam Brown via Cygwin wrote: > Greetings! > > Can Cygwin 3.7 clang generate Windows/ARM64 binaries somehow? > > My attempts so far are a failure: > clang -target aarch64-pc-windows-gnu -std=gnu17 -Wall -g grapetest1.c > -lntdll -o grapetest1.x86_64.exe > grapetest1.c:34:10: fatal error: 'windows.h' file not found > 34 | #include <windows.h> > | ^~~~~~~~~~~ > 1 error generated. >
Yes, but you need a sysroot. I have tested the scripts at https://github.com/mstorsjo/llvm-mingw you can use "LLVM_VERSION=llvmorg-20.1.8 ./build-all.sh --host-clang /opt/llvm-mingw" (or wherever you want things installed) and it will make sysroots and cross toolchain links for i686/x86_64/armv7/aarch64 in there. You may need to set the llvm version via environment variable "LLVM_VERSION=llvmorg-20.1.8", I think it defaults to 21.1.0 now. You will need llvm, clang and lld, plus normal host development tools (make, cmake, ninja, etc). -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
