https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109861
Bug ID: 109861
Summary: Optimization is marking uninitialized C_PTR being
passed to a C function, causes segfault.
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: brtnfld at hdfgroup dot org
Target Milestone: ---
Created attachment 55085
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55085&action=edit
Fortran/C/Makfile. Changing the optimization level in the makefile reproduces
the behaviour.
For a TYPE(C_PTR), INTENT(OUT), buf, which is being passed through a Fortran
subroutine to get the value set in a C function, an optimization of >= -O1
gives the warning "used uninitialized [-Wuninitialized]" and then the program
Segmentation faults - invalid memory reference. It works for gfortran 12 but
fails for gfortran 13 and 14. It works if the INTENT is INOUT.
