[Bug lto/65316] [5 Regression] LTO: Uninitialized memory / ICE with -g -fno-lto-odr-type-merging: in types_same_for_odr, at ipa-devirt.c:465

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65316

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Tobias Burnus from comment #5)
> Created attachment 34972 [details]
> valgrind output (for the lto1 child call)
> 
> (In reply to Jan Hubicka from comment #3)
> > $ while true ; do ./xgcc -B ./ -r -nostdlib -O2 -fno-lto-odr-type-merging
> > -flto one.o two.o ; done
> 
> Still fails here with a fail rate of 6.2%. (I used: "for ((I=0; $I<1000;
> I++))" to gather the data.) 
> 
> If I run "valgrind --trace-children=yes" (required as the failure is in lto1
> and not in (x)gcc), it shows the attached warnings.

All these warnings are bogus (and are disabled in a --enable-checking=valgrind
build).