[gcc r11-6887] Fortran: Fix deferred character lengths in array constructors [PR98517].

[gcc r11-6887] Fortran: Fix deferred character lengths in array constructors [PR98517].

[Paul Thomas]

https://gcc.gnu.org/g:c6b0e33febbf73abfcc2bb0e28f0b62afe3b0f2a

commit r11-6887-gc6b0e33febbf73abfcc2bb0e28f0b62afe3b0f2a
Author: Paul Thomas <pault@gcc.gnu.org>
Date:   Mon Jan 25 10:27:51 2021 +0000

    Fortran: Fix deferred character lengths in array constructors [PR98517].
    
    2021-01-25  Steve Kargl  <kargl@gcc.gnu.org>
    
    gcc/fortran
            PR fortran/98517
            * resolve.c (resolve_charlen): Check that length expression is
            present before testing for scalar/integer..
    
    gcc/testsuite/
            PR fortran/98517
            * gfortran.dg/charlen_18.f90 : New test.

Diff:
---
 gcc/fortran/resolve.c                    |  3 ++-
 gcc/testsuite/gfortran.dg/charlen_18.f90 | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index c075d0fa0c4..11b5dbc7a03 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -12446,7 +12446,8 @@ resolve_charlen (gfc_charlen *cl)
 	}
 
       /* cl->length has been resolved.  It should have an integer type.  */
-      if (cl->length->ts.type != BT_INTEGER || cl->length->rank != 0)
+      if (cl->length
+	  && (cl->length->ts.type != BT_INTEGER || cl->length->rank != 0))
 	{
 	  gfc_error ("Scalar INTEGER expression expected at %L",
 		     &cl->length->where);
diff --git a/gcc/testsuite/gfortran.dg/charlen_18.f90 b/gcc/testsuite/gfortran.dg/charlen_18.f90
new file mode 100644
index 00000000000..5ad287448b4
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/charlen_18.f90
@@ -0,0 +1,18 @@
+! { dg-do compile }
+! { dg-options "-fdec-structure" }
+!
+! Check fix for PR98517
+!
+! Contributed by Eric Reischer  <emr-gnu@hev.psu.edu>
+!
+      SUBROUTINE TEST_BUG
+      IMPLICIT NONE
+
+      CHARACTER*(*) DEF_VAL
+      PARAMETER (DEF_VAL = 'ABCDEFGH')
+
+      STRUCTURE /SOME_STRUCT/
+          CHARACTER*64    SOME_VAR /DEF_VAL/
+      END STRUCTURE
+
+      END