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Re: Turn on -fomit-frame-pointer by default for 32bit x86?
On 13/07/2010 22:44, H.J. Lu wrote:
> On Tue, Jul 13, 2010 at 2:02 PM, Andrew Pinski <email@example.com> wrote:
>> On Tue, Jul 13, 2010 at 2:01 PM, Andrew Pinski <firstname.lastname@example.org> wrote:
>>> On Tue, Jul 13, 2010 at 1:59 PM, H.J. Lu <email@example.com> wrote:
>>>> What will stop working when -fomit-frame-pointer is on?
>>> backtraces when debugging information is not turned on.
>> See http://gcc.gnu.org/ml/gcc-patches/2004-08/msg01033.html and many
>> more. This is not the first time this has been discussed.
> Most of 32bit x86 assembly codes in glibc have .eh_frame section.
> If backtrace is absolutely needed, they can add -fasynchronous-unwind-tables
> or -fno-omit-frame-pointer.
Alas not all the x86 world is a glibc. So if you want to do this it has to
be target-dependent I think.