re PR fortran/78865 (ICE in create_tmp_var, at gimple-expr.c:473)

2019-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/78865
	* interface.c (compare_actual_formal): Change errors about
	missing or extra to gfc_error_now to make sure they are issued.
	Change "spec" to "specifier" in message.
	* resolve.c (resolve_global_procedure): Also check for mismatching
	interface with global symbols if the namespace has already been
	resolved.

2019-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/78865
	* gfortran.dg/altreturn_10.f90: New test.
	* gfortran.dg/whole_file_3.f90: Change dg-warning to dg-error.

From-SVN: r269895

gcc/fortran/ChangeLog

+2019-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/78865
+	* interface.c (compare_actual_formal): Change errors about
+	missing or extra to gfc_error_now to make sure they are issued.
+	Change "spec" to "specifier" in message.
+	* resolve.c (resolve_global_procedure): Also check for mismatching
+	interface with global symbols if the namespace has already been
+	resolved.
+
 2019-03-21  Thomas Schwinge  <thomas@codesourcery.com>
 
 	PR fortran/72741

gcc/fortran/interface.c

@@ -2969,17 +2969,19 @@ compare_actual_formal (gfc_actual_arglist **ap, gfc_formal_arglist *formal,
 
       if (f->sym == NULL)
 	{
+	  /* These errors have to be issued, otherwise an ICE can occur.
+	     See PR 78865.  */
 	  if (where)
-	    gfc_error ("Missing alternate return spec in subroutine call "
-		       "at %L", where);
+	    gfc_error_now ("Missing alternate return specifier in subroutine "
+			   "call at %L", where);
 	  return false;
 	}
 
       if (a->expr == NULL)
 	{
 	  if (where)
-	    gfc_error ("Unexpected alternate return spec in subroutine "
-		       "call at %L", where);
+	    gfc_error_now ("Unexpected alternate return specifier in "
+			   "subroutine call at %L", where);
 	  return false;
 	}
 

gcc/fortran/resolve.c

@@ -2498,20 +2498,23 @@ resolve_global_procedure (gfc_symbol *sym, locus *where,
       && gsym->type != GSYM_UNKNOWN
       && !gsym->binding_label
       && gsym->ns
-      && gsym->ns->resolved != -1
       && gsym->ns->proc_name
       && not_in_recursive (sym, gsym->ns)
       && not_entry_self_reference (sym, gsym->ns))
     {
       gfc_symbol *def_sym;
+      def_sym = gsym->ns->proc_name;
+
+      if (gsym->ns->resolved != -1)
+	{
 
 	  /* Resolve the gsymbol namespace if needed.  */
 	  if (!gsym->ns->resolved)
 	    {
 	      gfc_symbol *old_dt_list;
 
-	  /* Stash away derived types so that the backend_decls do not
-	     get mixed up.  */
+	      /* Stash away derived types so that the backend_decls
+		 do not get mixed up.  */
 	      old_dt_list = gfc_derived_types;
 	      gfc_derived_types = NULL;
 
@@ -2539,8 +2542,6 @@ resolve_global_procedure (gfc_symbol *sym, locus *where,
 		}
 	    }
 
-      def_sym = gsym->ns->proc_name;
-
 	  /* This can happen if a binding name has been specified.  */
 	  if (gsym->binding_label && gsym->sym_name != def_sym->name)
 	    gfc_find_symbol (gsym->sym_name, gsym->ns, 0, &def_sym);
@@ -2555,6 +2556,7 @@ resolve_global_procedure (gfc_symbol *sym, locus *where,
 		    break;
 		  }
 	    }
+	}
 
       if (sym->attr.function && !gfc_compare_types (&sym->ts, &def_sym->ts))
 	{

gcc/testsuite/ChangeLog

+2019-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/78865
+	* interface.c (compare_actual_formal): Change errors about
+	missing or extra to gfc_error_now to make sure they are issued.
+	Change "spec" to "specifier" in message.
+	* resolve.c (resolve_global_procedure): Also check for mismatching
+	interface with global symbols if the namespace has already been
+	resolved.
+
 2019-03-22  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/89676

gcc/testsuite/gfortran.dg/altreturn_10.f90

+! { dg-do compile }
+! { dg-options -Os }
+! PR 78865 - this used to ICE.
+program p
+   call sub (3)
+end
+subroutine sub (x)
+   integer :: x, i, n
+   do i = 1, x
+      if ( n /= 0 ) stop
+      call sub2
+   end do
+   print *, x, n
+end
+subroutine sub2
+   call sub (*99) ! { dg-error "Unexpected alternate return specifier" }
+   call sub (99.) ! { dg-warning "Type mismatch in argument" }
+99 stop
+end

gcc/testsuite/gfortran.dg/whole_file_3.f90

@@ -14,8 +14,8 @@
 
       program test
       EXTERNAL R
-      call PHLOAD (R, 1) ! { dg-warning "Missing alternate return spec" }
-      CALL PHLOAD (R, 2) ! { dg-warning "Missing alternate return spec" }
+      call PHLOAD (R, 1) ! { dg-error "Missing alternate return specifier" }
+      CALL PHLOAD (R, 2) ! { dg-error "Missing alternate return specifier" }
       CALL PHLOAD (R, *999) ! This one is OK
  999  continue
       END program test