[Bug fortran/79929] [7 Regression] Bogus Warning: '__builtin_memset': specified size 4294967291 exceeds maximum object size 2147483647

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79929

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Thanks for the C test case.  In it, the warning is a false positive caused by
GCC's failure to eliminate the excessive memset at -O1.  The call is emitted by
the ccp1 pass at all optimization levels.  At -O2, it's also removed, looks
like by the forward propagation pass that runs just after ccp1, but at -O1 it's
never removed.