IPO causes sigsegv on my code

[alex_belousov]

Hi,

I try to replace gcc with icc for a commertial product. Having tool compiled without ipo I get ~ same performance.

The onlOnce I set ipo tool starts crashing. I can't figure out code -> sigsegv relationship. It looks like this pointer within a method call is broken.

Valrgind reports several UMR and then ABW causes sigsegv.

Once I switch off ipo valgrind shows nothing.

Are there any guidelines to debug such case?

Thanks,

Alex

[TimP]

IPO definitely aggravates the effects of storing data outside defined regions. As you say, it doesn't necessarily improve performance.

[alex_belousov]

Quoting - tim18

IPO definitely aggravates the effects of storing data outside defined regions. As you say, it doesn't necessarily improve performance.

I'm not sure if I get you correctly. My issue is that I get sigsegv with IPO. Is there any RTFM on IPO code compatibility or at least KPNS?

[TimP]

If you have a buffer overflow, it will have worse consequences with IPO set. RTFM is don't set IPO until your code is clean.