F21 system GCC changed to 4.9.0 prerelease

Panu Matilainen pmatilai at laiskiainen.org
Fri Apr 11 08:32:53 UTC 2014

On 04/10/2014 05:38 PM, Richard W.M. Jones wrote:
> On Thu, Apr 10, 2014 at 12:23:07PM +0200, Jakub Jelinek wrote:
>> To investigate runtime rather than compile time
>> issues, please consider using temporarily -fsanitize=undefined and/or
>> -fsanitize=address to look for undefined behavior in the packages
>> you own.
> Which is this in case anyone else was wondering:
>    '-fsanitize=address'
>       Enable AddressSanitizer, a fast memory error detector.  Memory
>       access instructions will be instrumented to detect out-of-bounds
>       and use-after-free bugs.  See
>       <http://code.google.com/p/address-sanitizer/> for more details.
>       The run-time behavior can be influenced using the 'ASAN_OPTIONS'
>       environment variable; see
>       <https://code.google.com/p/address-sanitizer/wiki/Flags#Run-time_flags>
>       for a list of supported options.

Also in case anybody else wonders about gcc failing to recognize these 
options, you'll need to add BuildRequires for these: libasan for 
-fsanitize=address and libubsan for -fsanitize=undefined (and similarly 
for leak and thread sanitizers )

	- Panu -

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