[PATCH] Bail out in gfc_dep_compare_expr for a NULL argument.

[Martin Liška]

Hi.

The patch is about early bail out in gfc_dep_compare_expr function
when one of the arguments (and not both at the same time) is null.
I'm not sure, it's a proper fix however.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.

Ready to be installed?
Thanks,
Martin

gcc/fortran/ChangeLog:

2019-12-10  Martin Liska  <mliska@suse.cz>

	PR fortran/92874
	* dependency.c (gfc_dep_compare_expr): Bail out
	when one of the arguments is null.

gcc/testsuite/ChangeLog:

2019-12-10  Martin Liska  <mliska@suse.cz>

	PR fortran/92874
	* gfortran.dg/pr92874.f90: New test.
---
  gcc/fortran/dependency.c              |  2 ++
  gcc/testsuite/gfortran.dg/pr92874.f90 | 11 +++++++++++
  2 files changed, 13 insertions(+)
  create mode 100644 gcc/testsuite/gfortran.dg/pr92874.f90


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