re PR fortran/69497 (ICE in gfc_free_namespace, at fortran/symbol.c:3701)

2018-03-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
	    Dominique d'Humieres  <dominiq@gcc.gnu.org>

	PR fortran/89497
	* symbol.c (gfc_free_namespace): Delete the assert and only if
	refs count is equals zero, free the namespace. Otherwise,
	something is halfway and other errors will resound.

	* gfortran.dg/pr89497.f90: New test.

Co-Authored-By: Dominique d'Humieres <dominiq@gcc.gnu.org>

From-SVN: r258839

gcc/fortran/ChangeLog

+2018-03-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+	    Dominique d'Humieres  <dominiq@gcc.gnu.org>
+
+	PR fortran/84506
+	* symbol.c (gfc_free_namespace): Delete the assert and only if
+	refs count is equals zero, free the namespace. Otherwise,
+	something is halfway and other errors will resound.
+
 2018-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/70068

gcc/fortran/symbol.c

@@ -4037,10 +4037,9 @@ gfc_free_namespace (gfc_namespace *ns)
     return;
 
   ns->refs--;
-  if (ns->refs > 0)
-    return;
 
-  gcc_assert (ns->refs == 0);
+  if (ns->refs != 0)
+    return;
 
   gfc_free_statements (ns->code);
 

gcc/testsuite/ChangeLog

+2018-03-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR fortran/89497
+	* gfortran.dg/pr89497.f90: New test.
+
 2018-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/70068

gcc/testsuite/gfortran.dg/pr69497.f90

+! { dg-do compile }
+! PR89497
+program p
+   block
+   do
+   end block ! { dg-error "Expecting END DO statement" }
+end ! { dg-error "END DO statement expected" }
+! { dg-excess-errors "Unexpected end of file" }