[PATCH] PR fortran/99853 - ICE: Cannot convert 'LOGICAL(4)' to 'INTEGER(8)' (etc.)

[Harald Anlauf via Fortran]

Dear Fortranners,

the original fix by Steve was lingering in the PR.

We did ICE in situations where in a SELECT CASE a kind conversion
was deemed necessary, but it did involve different types.
The check gfc_convert_type_warn () was invoked with arguments
requesting to generate an internal error.  A regular gfc_error
is good enough here.

Regtested on x86_64-pc-linux-gnu.  OK?

Thanks, also to Steve,

Harald


Fortran: generate regular error on invalid conversions of CASE expressions

gcc/fortran/ChangeLog:

        PR fortran/99853
        * resolve.c (resolve_select): Generate regular gfc_error on
        invalid conversions instead of an gfc_internal_error.

gcc/testsuite/ChangeLog:

        PR fortran/99853
        * gfortran.dg/pr99853.f90: New test.


diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index af71b132dec..8da396b32ec 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -8770,11 +8770,11 @@ resolve_select (gfc_code *code, bool select_type)

 	      if (cp->low != NULL
 		  && case_expr->ts.kind != gfc_kind_max(case_expr, cp->low))
-		gfc_convert_type_warn (case_expr, &cp->low->ts, 2, 0);
+		gfc_convert_type_warn (case_expr, &cp->low->ts, 1, 0);

 	      if (cp->high != NULL
 		  && case_expr->ts.kind != gfc_kind_max(case_expr, cp->high))
-		gfc_convert_type_warn (case_expr, &cp->high->ts, 2, 0);
+		gfc_convert_type_warn (case_expr, &cp->high->ts, 1, 0);
 	    }
 	 }
     }
diff --git a/gcc/testsuite/gfortran.dg/pr99853.f90 b/gcc/testsuite/gfortran.dg/pr99853.f90
new file mode 100644
index 00000000000..421a656bec2
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr99853.f90
@@ -0,0 +1,29 @@
+! { dg-do compile }
+! { dg-options "-std=f2018" }
+! PR fortran/99853
+
+subroutine s1 ()
+  select case (.true.) ! { dg-error "Cannot convert" }
+  case (1_8)           ! { dg-error "must be of type LOGICAL" }
+  end select
+end
+
+subroutine s2 ()
+  select case (.false._1) ! { dg-error "Cannot convert" }
+  case (2:3)              ! { dg-error "must be of type LOGICAL" }
+  end select
+end
+
+subroutine s3 ()
+  select case (3_2) ! { dg-error "Cannot convert" }
+  case (.false.)    ! { dg-error "must be of type INTEGER" }
+  end select
+end
+
+subroutine s4 (i)
+  select case (i) ! { dg-error "Cannot convert" }
+  case (.true._8) ! { dg-error "must be of type INTEGER" }
+  end select
+end
+
+! { dg-prune-output "Cannot convert" }