gcc/testsuite/gcc.dg/c2x-unproto-1.c

   1 /* Test compatibility of prototyped function types with and without arguments
   2    (C2x made the case of types affected by default argument promotions
   3    compatible, before removing unprototyped functions completely).  Test
   4    affected usages are not accepted for C2x.  */
   5 /* { dg-do compile } */
   6 /* { dg-options "-std=c2x -pedantic-errors" } */
   7
   8 void f1 (); /* { dg-message "previous declaration" } */
   9 void f1 (float); /* { dg-error "conflicting types" } */
  10
  11 void f2 (float); /* { dg-message "previous declaration" } */
  12 void f2 (); /* { dg-error "conflicting types" } */
  13
  14 void f3 (); /* { dg-message "previous declaration" } */
  15 void f3 (char); /* { dg-error "conflicting types" } */
  16
  17 void f4 (char); /* { dg-message "previous declaration" } */
  18 void f4 (); /* { dg-error "conflicting types" } */
  19
  20 /* Built-in function case.  */
  21 float sqrtf (); /* { dg-warning "conflicting types for built-in function" } */