[google gcc-4_7, integration] Build more of libstdc++ with frame pointers

Ian Lance Taylor iant@google.com
Thu Feb 28 17:28:00 GMT 2013


On Thu, Feb 28, 2013 at 8:23 AM, Paul Pluzhnikov <ppluzhnikov@google.com> wrote:
> On Wed, Feb 27, 2013 at 5:52 PM, Ian Lance Taylor <iant@google.com> wrote:
>
>> I think that the libgcc unwinder only calls malloc if somebody calls
>> __register_frame_info.
>
> So I looked. Indeed it doesn't call malloc in our environment, but
> does call dl_iterate_phdr, which is just as deadly.

Hmmm, I guess I can't remember why.  dl_iterate_phdr uses a recursive
lock so there shouldn't be any deadlock problem.  If the problem is
the dynamic lookup of the dl_iterate_phdr symbol for lazy PLT
evaluation, that could be finessed by calling it beforehand.

Ian



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