[Bug target/64941] -O3 breaks tar

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64941

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
First of all, -march=native and/or -mtune=native depends on the CPU you have,
so it is very hard to reproduce without the same CPU.  So, you should print
what -march=native -mtune=native means for you, e.g. by adding -v to CFLAGS and
pasting here the cc1 or cc1plus command line.
Then, you could try to bisect it among the -O3 vs. -O2 *.o files, always take
some -O3 and some -O2 files and find out the problematic one, attach
preprocessed source for that one (others might have different version of glibc
and its headers etc.).