On 06/01/2016 11:39 AM, Dmitry Yemanov wrote:
> 01.06.2016 11:34, Alex Peshkoff wrote:
>
>> But they provide (unlike gcc) working code. At least on AIX.
> Does GCC fail to create a working code even with -O2 and lower settings?
> I.e. is it optimization issue or something fundamental?

Main problem is that it provides incorrect debugging info for MT 
programs. May be it's gdb problem, but toolchain is anyway broken. It's 
code also had some else MT issues (do not remember details) which seem 
to be gone when switching to xlc. And yes, they took place even in DEV 
build, i.e. with -O0.

May be after debugging port using xlc and native debugger it will be 
possible to have working gcc build too, but as porting to AIX tool gcc 
is currently definitely unusable.



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