Are -march options expected to override any relevant options specified
previously on the command line? It appears in GCC-4.2.0 that SSE movss
instructions will be generated when for example the following code is compiled
with -msse -march=athlon:
#include <mmintrin.h>
int main() {
__m64 v = _mm_cvtsi32_si64(1);
return 0;
}
$ gcc -msse -march=athlon conftest.c
$ ./a.out
Illegal instruction
I would expect this from -march=athlon -msse, but would also expect
-march=athlon to imply -mno-sse and therefore cancel the previous -msse option.
This was encountered in the pixman-0.9.5 configure script.
https://bugs.gentoo.org/192048
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fonts / wxWindows / gcc-porting / treecleaners
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