Hans Horn wrote:
Folks,
what is the current status of -ffast-math for gcc4 under cygwin.
I tried to use it for some numerical C code and get the following link
errors:
eval.o:eval.c:(.text+0x79c): undefined reference to `_f_pow'
eval.o:eval.c:(.text+0x7d8): undefined reference to `_f_log'
eval.o:eval.c:(.text+0x7f0): undefined reference to `_f_exp'
WJFFM:
$ cat math.c
#include <math.h>
int main (int argc, const char **argv)
{
float f = atof (argv[1]);
double d = log (f);
return exp (f);
}
admin@ubik /tmp/math
$ gcc-4 math.c -o math
admin@ubik /tmp/math
$ gcc-4 math.c -o math -ffast-math
admin@ubik /tmp/math
$ gcc-4 math.c -o math -ffast-math -O2
admin@ubik /tmp/math
$ gcc-4 math.c -o math -ffast-math -O3
admin@ubik /tmp/math
$
Perhaps a few more details about what you're doing, a simple reproducible
testcase, what kind of command-lines you're using, etc. etc... might help.
cheers,
DaveK