F21 system GCC changed to 4.9.0 prerelease

[Josh Boyer]

On Fri, Apr 11, 2014 at 5:10 AM, Jakub Jelinek <jakub at redhat.com> wrote:
> On Fri, Apr 11, 2014 at 11:32:53AM +0300, Panu Matilainen wrote:
>> 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 )
>
> Yeah.  But, note that the sanitizers are meant primarily for development,
> not for production, and especially -fsanitize=thread and to some extent
> -fsanitize=address aren't completely cheap, so if you do that, please do
> so temporarily and don't forget to disable it again for production.

Seems they were enabled for RPM in rawhide and now a mock chroot fails
to init because RPM explodes.  This is from a noarch (which is run on
an ARM builder) build from a scratch build.

DEBUG util.py:331:  Executing command: ['rpm', '-Uvh', '--nodeps',
'/builddir/build/originals/kernel-3.15.0-0.rc0.git12.1.fc21.src.rpm']
with env {'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL':
'/bin/bash', 'HOSTNAME': 'mock', 'PROMPT_COMMAND': 'echo -n
"<mock-chroot>"', 'HOME': '/builddir', 'PATH':
'/usr/bin:/bin:/usr/sbin:/sbin'}
DEBUG util.py:281:  ==13953==AddressSanitizer CHECK failed:
../../../../libsanitizer/asan/asan_globals.cc:91
"((AddrIsAlignedByGranularity(g->beg))) != (0)" (0x0, 0x0)
DEBUG util.py:281:      #0 0xb6a6d21b (/lib/libasan.so.1+0x6121b)
DEBUG util.py:281:      #1 0xb6a71a8b in __sanitizer::CheckFailed(char
const*, int, char const*, unsigned long long, unsigned long long)
(/lib/libasan.so.1+0x65a8b)
DEBUG util.py:281:      #2 0xb6a2b01b in __asan_register_globals
(/lib/libasan.so.1+0x1f01b)
DEBUG util.py:281:      #3 0xb6f11877 in call_init.part.0
(/lib/ld-linux-armhf.so.3+0x11877)
DEBUG util.py:281:      #4 0xb6f119d3 in _dl_init
(/lib/ld-linux-armhf.so.3+0x119d3)
DEBUG util.py:281:      #5 0xb6f00bc3 (/lib/ld-linux-armhf.so.3+0xbc3)
DEBUG util.py:371:  Child return code was: 1

Full scratch build:

http://koji.fedoraproject.org/koji/taskinfo?taskID=6727256

josh