[Bug lto/85132] ffmpeg runtime segfault with lto

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85132

--- Comment #11 from Martin Liška <marxin at gcc dot gnu.org> ---
It was changed on trunk in:

commit 371072bf395be11f36ef31bb3cfec06bbfc58597
Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Fri Sep 1 16:26:00 2017 +0000

            * varasm.c (bss_initializer_p): Do not put constants into .bss
            (categorize_decl_for_section): Handle bss_initializer_p returning
            false when DECL_INITIAL is NULL.

            * gcc.target/i386/const-in-bss.c: New test.

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@251602
138bc75d-0d04-0410-961f-82ee72b054a4

Note the using an undefined behavior gives optimizer opportunity to optimize to
any way. In this case GCC 7 generated working and GCC 8 not working code in
case of ffmpeg.