[Bug fortran/96018] Optimization issue with external HDF5 library

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96018

--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I can not test at the moment, that will have to wait for a few days.

A general comment:

In Fortran, functions exist to return a value. C-style „return an error status“
fit rather badly to the language, that is much better expressed wirh a
subroutine
(plus an optional error reporting argument).

Having said that, one thing that might influence the behavior is front-end
optimization. What happens if -fno-frontend-optimize -O is specified?