gcc/testsuite/c-c++-common/Wvarargs-2.c

   1 /*
   2    { dg-options "-Wno-varargs" }
   3    { dg-do compile }
   4  */
   5
   6 #include <stdarg.h>
   7
   8 void
   9 err (int a)
  10 {
  11   va_list vp;
  12   va_start (vp, a); // { dg-error "used in function with fixed arguments" }
  13 }
  14
  15 void
  16 foo0 (int a, int b, ...)
  17 {
  18     va_list vp;
  19     /* 'a' is not the last argument of the enclosing function, but
  20        don't warn because we are ignoring -Wvarargs.  */
  21     va_start (vp, a);
  22     va_end (vp);
  23 }
  24
  25 void
  26 foo1 (int a, register int b, ...)       // { dg-warning "ISO C\\+\\+17 does not allow 'register' storage class specifier" "" { target c++17 } }
  27 {
  28     va_list vp;
  29     /* 'b' is declared with register storage, but don't warn
  30        because we are ignoring -Wvarargs.  */
  31     va_start (vp, b);
  32     va_end (vp);
  33 }