[haiku-development] Re: Disabling Strict Aliasing for GCC4 Builds
- From: "Michael Lotz" <mmlr@xxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Fri, 18 Apr 2008 00:04:49 +0200
Hi Alex
> I tried compiling that as follows:
> gcc -std=c99 -c -O2 -fstrict-aliasing 3.c
>
> ... and I got no compiler errors, though I see the problem... I did
> this using gcc " version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)" on my linux
> box...
>
> Am I providing wrong compiler options (I know that -fstrict-aliasing
> is redundant, but...)? Or is the problem not showing up in this
> particular example?
You'll need -Wall to see the warning. I only tried with what I have
here:
i586-pc-haiku-gcc (GCC) 4.1.2
int
main(int argc, char *argv[])
{
double someDouble = 0.0;
someDouble += 5.0;
int variable = *(int *)&someDouble;
someDouble -= 3.0;
return 0;
}
Compiled with:
/cross-compiler-path/i586-pc-haiku-gcc -c "testalias.cpp" -O2 -o
"testalias" -Wall;
Got:
testalias.cpp:6: warning: dereferencing type-punned pointer will break
strict-aliasing rules
Regards
Michael
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