[Bug tree-optimization/104156] [12 Regression] -fcompare-debug failure with -O2 -funswitch-loops since r12-4526-gd8edfadfc7a9795b

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104156

--- Comment #10 from rguenther at suse dot de <rguenther at suse dot de> ---
On Sat, 22 Jan 2022, cnsun at uwaterloo dot ca wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104156
> 
> --- Comment #9 from Chengnian Sun <cnsun at uwaterloo dot ca> ---
> Thanks, Andrew. 
> 
> What about -flto? Does GCC still guarantee such a compilation consistency wrt
> to debug info in the presence of -flto?

Yes, even with -flto we aim to produce the same code.  Note I'm not 100%
sure that -fcompare-debug works fine on the LTRANS level so you maybe
need to adjust to -flto-partiton=none.