On 2019-06-25 19:59, Xi Ruoyao wrote:
On 2019-06-25 15:36 +0200, J.W. Jagersma wrote:Say I have a header which defines a type conditionally based on the __SSE__ macro: #ifdef __SSE__ struct X { ... }; #else struct X { ... }; #endif This header is included in multiple compilation units, some of which are compiled with -mgeneral-regs-only. I don't want any fpu/simd code there. Now this flag also undefines __SSE__, which I suppose makes sense, but it breaks the ABI between translation units. Is there some way to avoid generating fpu code without affecting preprocessor macros?How about just "pretend" to have __SSE__? cat > test.c << EOF #ifndef __SSE__ #error #endif int main(){} EOF gcc test.c -mgeneral-regs-only -D__SSE__
Ideally I'd have the macros defined by -march so I don't need to complicate the build process for different architectures. I suppose I could work this out in the makefile, but a different solution would be preferable.
