Fortran: prevent redundant integer division truncation warnings [PR10…

…8592]

gcc/fortran/ChangeLog:

	PR fortran/108592
	* arith.cc (gfc_arith_divide): Emit integer division truncation
	warnings using gfc_warning instead of gfc_warning_now to prevent
	redundant messages.

gcc/testsuite/ChangeLog:

	PR fortran/108592
	* gfortran.dg/pr108592.f90: New test.

gcc/fortran/arith.cc

@@ -778,7 +778,7 @@ gfc_arith_divide (gfc_expr *op1, gfc_expr *op2, gfc_expr **resultp)
 	    {
 	      char *p;
 	      p = mpz_get_str (NULL, 10, result->value.integer);
-	      gfc_warning_now (OPT_Winteger_division, "Integer division "
+	      gfc_warning (OPT_Winteger_division, "Integer division "
 			       "truncated to constant %qs at %L", p,
 			       &op1->where);
 	      free (p);

gcc/testsuite/gfortran.dg/pr108592.f90

@@ -0,0 +1,8 @@
+! { dg-do compile }
+! { dg-options "-Winteger-division" }
+! PR fortran/108592 - warn only once for truncation of integer division
+
+program foo
+  if (8 < (20/9)) stop 1 ! { dg-bogus "Integer division.*Integer division" }
+! { dg-message "Integer division truncated" "" { target *-*-* } .-1 }
+end program