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Fabian Greffrath 11-28-2011 12:22 PM

Bug#650275: gcc-4.6: Does only detect division by zero for int, not float
Package: gcc-4.6
Version: 4.6.2-5
Severity: minor


I find it strange and inconsistent that gcc only detects and reports hard-coded
devision by zero for int variables but not for those of type float. If you
compile the attached example, gcc will print the following warning:

$ gcc -W -Wall -Wextra nan.c
nan.c: In function ‘main’:
nan.c:6:18: warning: division by zero [-Wdiv-by-zero]

Please note that this warning is true for both lines 5 and 6.

Best Regards,

-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (501, 'unstable'), (101, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 3.0.0-2-686-pae (SMP w/1 CPU core)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gcc-4.6 depends on:
ii binutils 2.22-1
ii cpp-4.6 4.6.2-5
ii gcc-4.6-base 4.6.2-5
ii libc6 2.13-21
ii libgcc1 1:4.6.2-5
ii libgmp10 2:5.0.2+dfsg-2
ii libgomp1 4.6.2-5
ii libmpc2 0.9-4
ii libmpfr4 3.1.0-3
ii libquadmath0 4.6.2-5
ii zlib1g 1:1.2.5.dfsg-1

Versions of packages gcc-4.6 recommends:
ii libc6-dev 2.13-21

Versions of packages gcc-4.6 suggests:
pn binutils-gold <none>
pn gcc-4.6-doc <none>
pn gcc-4.6-locales <none>
pn gcc-4.6-multilib <none>
pn libgcc1-dbg <none>
pn libgomp1-dbg <none>
pn libmudflap0-4.6-dev <none>
pn libmudflap0-dbg <none>
pn libquadmath0-dbg <none>

-- no debconf information
#include <stdio.h>

int main (void)
float f = 0/0.;
int i = 0/0;

printf("f: %f, i: %d
", f, i);

return 0;

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