https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107695
Bug ID: 107695
Summary: Non conforming shape during assignment is not detected
at run-time
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: [email protected]
Target Milestone: ---
Created attachment 53900
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53900&action=edit
Fortran test program which reveals the bug
At run-time, the attached program leads to memory problems (only detected by
valgrind).
It is compiled by the following command:
$ gfortran -fbounds-check -g -o test test.f90
The bug occurs at least for GCC versions from 8.5 to 12.2
In the following assignment:
z(ind,ind) = data(:,:)
I thought that data is recognized as a scalar (shape is [1,1]) and its value
spread to the four elements of z. This is not the case.
However:
z(ind,ind) = data(1,1)
gives the correct result as expected.
Of course, the problem cannot be detected at compile-time since both 'z' and
'data' arrays are allocatable.
