re PR fortran/91471 (f951: internal compiler error: gfc_variable_attr(): Bad array reference)

2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91471
	* primary.c (gfc_variable_attr): Remove a gfc_internal_error(),
	which cannot be reached by conforming Fortran code, but seems to
	be reachable from nonconforming Fortran code.  Treat the AR_UNKNOWN
	case as a no-op.

2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91471
	* gfortran.dg/pr91471.f90: New test.

From-SVN: r274603

gcc/fortran/ChangeLog

+2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/91471
+	* primary.c (gfc_variable_attr): Remove a gfc_internal_error(),
+	which cannot be reached by conforming Fortran code, but seems to
+	be reachable from nonconforming Fortran code.  Treat the AR_UNKNOWN
+	case as a no-op.
+
 2019-08-17  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	PR fortran/68401

gcc/fortran/primary.c

@@ -2597,12 +2597,10 @@ gfc_variable_attr (gfc_expr *expr, gfc_typespec *ts)
 	    break;
 
 	  case AR_UNKNOWN:
-	    /* If any of start, end or stride is not integer, there will
-	       already have been an error issued.  */
-	    int errors;
-	    gfc_get_errors (NULL, &errors);
-	    if (errors == 0)
-	      gfc_internal_error ("gfc_variable_attr(): Bad array reference");
+	    /* For standard conforming code, AR_UNKNOWN should not happen.
+	       For nonconforming code, gfortran can end up here.  Treat it 
+	       as a no-op.  */
+	    break;
 	  }
 
 	break;

gcc/testsuite/ChangeLog

+2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/91471
+	* gfortran.dg/pr91471.f90: New test.
+
 2019-08-16  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/85827

gcc/testsuite/gfortran.dg/pr91471.f90

+! { dg-do compile }
+! PR fortran/91471
+! Code contributed by Sameeran Joshi <SameeranJayant dot Joshi at amd dot com>
+!
+! This invalid code (x(1) is referenced, but never set) caused an ICE due
+! to hitting a gfc_internal_error() in primary.c (gfc_variable_attr).  The
+! fix is to remove that gfc_internal_error().
+! 
+program dynamic
+   implicit none
+   integer, dimension(:), allocatable :: x
+   allocate(x(1))
+   stop x(1)
+end program dynamic