Today I saw a thread on the linux-kernel list [1] about a gcc compilation issue that affects _all_ gcc versions in Debian after gcc-2.95. I've filed bugs reports: #452108 (gcc-4.2); #452113 (gcc-4.1); #452114 (gcc-3.3); #452115 (gcc-3.4)
The issue is that in some cases a negative const before an abs() function
will be brought _inside_ the abs() function and will thus be converted to a
positive.
The following test code shows the issue:
int main( void )
{
int i=2;
if( -10*abs(i-1) == 10*abs(i-1) )
printf ("OMG,-10==10 in linux!\n");
else
printf ("nothing special here\n") ;
return 0 ;
}
A patch is available, but the question facing Debian is: should we do a scan
of the archive to see if and which binary packages are affected?
Cheers,
FJP
[1] http://lkml.org/lkml/2007/11/19/493
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