[Bug ipa/127752] volatile member read of a never-written global dropped with -O2

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127752

--- Comment #5 from Drea Pinski <pinskia at gcc dot gnu.org> ---
With the linker script example, you dont have a declaration so things just
work.
Or if you do you use the section attribute and maybe even mark the variable
with noipa.