On Sun, May 12, 2019 at 08:22:36PM +0200, Agner Fog wrote: > I have noticed that the gcc and clang compilers have defined the > preprocessing macro __unix__, but not __WINDOWS__, _WIN32, or _WIN64 when > compiling a windows executable. > > Why is this?
As I understand it, when using the cygwin compiler to compile for the cygwin target, these defines are intentionally not defined, because Cygwin is supposed to look and feel like a Posix platform, not a windows one. The various MinGW compilers do define these constants because the target is native windows. I think these days the canonical defines are (somebody correct me if I'm wrong) __CYGWIN__ for Cygwin _WIN32 as 1 on MinGW when the compilation target is Windows 32-bit ARM, 64-bit ARM, x86, or x64. Otherwise, undefined. _WIN64 as 1 on MinGW when the compilation target is Windows 64-bit ARM or x64. Otherwise, undefined I am not a maintainer. - Mike Gran -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
