re PR fortran/82992 (ICE in create_int_parameter_array, at fortran/module.c:6586)

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

	PR fortran/82992
	* module.c (gfc_match_use):  When renaming a module entity, search
	current namespace for conflicting symbol.

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

	PR fortran/82992
	* gfortran.dg/pr71649.f90: Adjust error messages.
	* gfortran.dg/use_15.f90: Ditto.
	* gfortran.dg/use_rename_8.f90: Ditto.

From-SVN: r274608

gcc/fortran/ChangeLog

 2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
 
+	PR fortran/82992
+	* module.c (gfc_match_use):  When renaming a module entity, search
+	current namespace for conflicting symbol.
+
+2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
+
 	PR fortran/78739
 	* match.c (gfc_match_st_function):  When matching a statement function,
 	need to check if the statement function name shadows the function

gcc/fortran/module.c

@@ -525,6 +525,8 @@ gfc_match_use (void)
   gfc_intrinsic_op op;
   match m;
   gfc_use_list *use_list;
+  gfc_symtree *st;
+  locus loc;
 
   use_list = gfc_get_use_list ();
 
@@ -632,6 +634,8 @@ gfc_match_use (void)
 	case INTERFACE_USER_OP:
 	case INTERFACE_GENERIC:
 	case INTERFACE_DTIO:
+	  loc = gfc_current_locus;
+
 	  m = gfc_match (" =>");
 
 	  if (type == INTERFACE_USER_OP && m == MATCH_YES
@@ -642,6 +646,18 @@ gfc_match_use (void)
 	  if (type == INTERFACE_USER_OP)
 	    new_use->op = INTRINSIC_USER;
 
+	  st = gfc_find_symtree (gfc_current_ns->sym_root, name);
+	  if (st)
+	    {
+	      if (m == MATCH_YES)
+		gfc_error ("Symbol %qs at %L conflicts with the rename symbol "
+			   "at %L", name, &st->n.sym->declared_at, &loc);
+	      else
+		gfc_error ("Symbol %qs at %L conflicts with the symbol "
+			   "at %L", name, &st->n.sym->declared_at, &loc);
+	      goto cleanup;
+	    }
+
 	  if (use_list->only_flag)
 	    {
 	      if (m != MATCH_YES)

gcc/testsuite/ChangeLog

 2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
 
+	PR fortran/82992
+	* gfortran.dg/pr71649.f90: Adjust error messages.
+	* gfortran.dg/use_15.f90: Ditto.
+	* gfortran.dg/use_rename_8.f90: Ditto.
+
+2019-08-17  Steven G. Kargl  <kargl@gcc.gnu.org>
+
 	PR fortran/78739
 	* fortran.dg/pr78739.f90: New test.
 

gcc/testsuite/gfortran.dg/pr71649.f90

 ! { dg-do compile }
 ! PR71649 Internal Compiler Error
-SUBROUTINE Compiler_Options ( Options, Version, WriteOpt )
-   USE ISO_FORTRAN_ENV, ONLY : Compiler_Version, Compiler_Options ! { dg-error "already declared" }
+SUBROUTINE Compiler_Options ( Options, Version, WriteOpt )        ! { dg-error "\(1\)" }
+   USE ISO_FORTRAN_ENV, ONLY : Compiler_Version, Compiler_Options ! { dg-error "conflicts with the" }
    IMPLICIT NONE
    CHARACTER (LEN=*), INTENT(OUT) :: Options
    CHARACTER (LEN=*), INTENT(OUT) :: Version
    LOGICAL, INTENT(IN), OPTIONAL  :: WriteOpt
-   Version = Compiler_Version()
+   Version = Compiler_Version()  ! { dg-error "has no IMPLICIT type" }
    Options = Compiler_Options()  ! { dg-error "Unexpected use of subroutine name" }
    RETURN
 END SUBROUTINE Compiler_Options

gcc/testsuite/gfortran.dg/use_15.f90

@@ -28,8 +28,8 @@ subroutine my_sub2 (a)
 end subroutine
 
 
-subroutine my_sub3 (a)
-  use test_mod2, my_sub3 => my_sub2  ! { dg-error "is also the name of the current program unit" }
+subroutine my_sub3 (a)              ! { dg-error "\(1\)" }
+  use test_mod2, my_sub3 => my_sub2 ! { dg-error "conflicts with the rename" }
   real a
   print *, a
 end subroutine

gcc/testsuite/gfortran.dg/use_rename_8.f90

@@ -19,8 +19,8 @@ SUBROUTINE T
     USE MOO, ONLY: X => B
 END SUBROUTINE T
 
-SUBROUTINE C
-    USE MOO, ONLY: C  ! { dg-error "is also the name of the current program unit" }
+SUBROUTINE C          ! { dg-error "\(1\)" }
+    USE MOO, ONLY: C  ! { dg-error "conflicts with the" }
 END SUBROUTINE C
 
 SUBROUTINE D
@@ -36,15 +36,15 @@ SUBROUTINE F
     USE MOO, ONLY: X => F
 END SUBROUTINE F
 
-SUBROUTINE X
-    USE MOO, ONLY: X => G ! { dg-error "is also the name of the current program unit" }
+SUBROUTINE X              ! { dg-error "\(1\)" }
+    USE MOO, ONLY: X => G ! { dg-error "conflicts with the rename" }
 END SUBROUTINE X
 
-SUBROUTINE Y
-    USE MOO, ONLY: Y => H ! { dg-error "is also the name of the current program unit" }
+SUBROUTINE Y              ! { dg-error "\(1\)" }
+    USE MOO, ONLY: Y => H ! { dg-error "conflicts with the rename" }
 END SUBROUTINE Y
 
-SUBROUTINE Z
-    USE MOO, ONLY: Z => I, Z => I ! { dg-error "is also the name of the current program unit" }
+SUBROUTINE Z                        ! { dg-error "\(1\)" }
+    USE MOO, ONLY: Z => I, Z => I   ! { dg-error "conflicts with the rename" }
 END SUBROUTINE Z