2021-11-02  Manfred Schwarb  <manfred99@gmx.ch>

gcc/fortran/ChangeLog:

	PR fortran/91497
	* simplify.c (simplify_min_max): Disable conversion warnings for
	MIN1 and MAX1.

--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -5087,6 +5087,7 @@ min_max_choose (gfc_expr *arg, gfc_expr
 static gfc_expr *
 simplify_min_max (gfc_expr *expr, int sign)
 {
+  int tmp1, tmp2;
   gfc_actual_arglist *arg, *last, *extremum;
   gfc_expr *tmp, *ret;
   const char *fname;
@@ -5131,7 +5132,16 @@ simplify_min_max (gfc_expr *expr, int si
   if ((tmp->ts.type != BT_INTEGER || tmp->ts.kind != gfc_integer_4_kind)
       && (strcmp (fname, "min1") == 0 || strcmp (fname, "max1") == 0))
     {
+      /* Explicit conversion, turn off -Wconversion and -Wconversion-extra
+         warnings.  */
+      tmp1 = warn_conversion;
+      tmp2 = warn_conversion_extra;
+      warn_conversion = warn_conversion_extra = 0;
+
       ret = gfc_convert_constant (tmp, BT_INTEGER, gfc_integer_4_kind);
+
+      warn_conversion = tmp1;
+      warn_conversion_extra = tmp2;
     }
   else if ((tmp->ts.type != BT_REAL || tmp->ts.kind != gfc_real_4_kind)
 	   && (strcmp (fname, "amin0") == 0 || strcmp (fname, "amax0") == 0))