Bug #1740

Linux emulation: -ffast-math causes floating point exception

Added by Johannes.Hofmann about 4 years ago.

Status:NewStart date:
Priority:NormalDue date:
Assignee:-% Done:

0%

Category:-
Target version:-

Description

Some Linux binaries compiled with -ffast-math crash with floating
point exception. There also is a warning in dmesg:

FXRSTR: illegal FP MXCSR 00009fc0 didinit = 0

This is a bit unfortunate as for some reason the procps package
(pkill, pgrep, uptime, etc) is compiled with the -ffast-math switch
and the utilities crash.

The following mini-program shows the crash when compiled with
-ffast-math (as Linux binary):

#include <stdio.h>

int main(int argc, char **argv) {
double d;

scanf("%lf", &d);
printf("%f\n", d);
}

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