Re: F21 system GCC changed to 4.9.0 prerelease

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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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