Hello Sebastian. AFAIK, LLVM has no *-pc-cygwin targets support and there is no-one trying to change that.
The best take you can have for now is to build your own GCC Linux to Windows cross-compiler using https://github.com/Windows-on-ARM-Experiments/mingw-woarm64-build scripts or download it for Ubuntu 24.04 from the releases section of that repository. Best regards, Radek ________________________________ From: Cygwin <cygwin-bounces~radekbarton=microsoft....@cygwin.com> on behalf of Sebastian Feld via Cygwin <cygwin@cygwin.com> Sent: Tuesday, June 17, 2025 11:40 AM To: cygwin@cygwin.com <cygwin@cygwin.com> Subject: [EXTERNAL] Cygwin /usr/bin/clang with Windows Aarch64 support? Does Cygwin /usr/bin/clang has Aarch64 support, to compile native Windows Aarch64 binaries if Cygwin-x86-64 runs on Windows Aarch64? Sebi -- Sebastian Feld - IT security consultant -- Problem reports: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcygwin.com%2Fproblems.html&data=05%7C02%7Cradek.barton%40microsoft.com%7C0b30aa6abf684cb660be08ddad831e0a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638857502531532214%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=wUVSfG3vUZBA0jTufXVAnrW2suCTC0sDniOPMWEXc%2Fk%3D&reserved=0<https://cygwin.com/problems.html> FAQ: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcygwin.com%2Ffaq%2F&data=05%7C02%7Cradek.barton%40microsoft.com%7C0b30aa6abf684cb660be08ddad831e0a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638857502531560029%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=e07JsMS7IgHLgprlkNR3s25echIRAxN9WrqlYac%2Fkcw%3D&reserved=0<https://cygwin.com/faq/> Documentation: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcygwin.com%2Fdocs.html&data=05%7C02%7Cradek.barton%40microsoft.com%7C0b30aa6abf684cb660be08ddad831e0a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638857502531573782%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=W2EZstNMsCiuPmdOcqCkzX%2FWe5Vri4yKfa5SY6AzNYk%3D&reserved=0<https://cygwin.com/docs.html> Unsubscribe info: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcygwin.com%2Fml%2F%23unsubscribe-simple&data=05%7C02%7Cradek.barton%40microsoft.com%7C0b30aa6abf684cb660be08ddad831e0a%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638857502531585002%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C60000%7C%7C%7C&sdata=9%2FIS8OqCKQQsLIJ36xdgBxTTTo9Hk6NBpePhF2B6l3c%3D&reserved=0<https://cygwin.com/ml/#unsubscribe-simple> -- 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
