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

   1 /* { dg-do compile } */
   2
   3 #include <stdarg.h>
   4
   5 void
   6 err (int a)
   7 {
   8   va_list vp;
   9   va_start (vp, a); // { dg-error "used in function with fixed args" }
  10 }
  11
  12 #pragma GCC diagnostic push
  13 #pragma GCC diagnostic ignored "-Wvarargs"
  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, ...)
  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 }
  34
  35 #pragma GCC diagnostic pop
  36
  37 void
  38 foo2 (int a, int b, ...)
  39 {
  40     va_list vp;
  41     /* 'a' is not the last argument of the enclosing function, so
  42        warn.  */
  43     va_start (vp, a); /* { dg-warning "second parameter" } */
  44     va_end (vp);
  45 }
  46
  47 void
  48 foo3 (int a, register int b, ...)
  49 {
  50     va_list vp;
  51     /* 'b' is declared with register storage, so warn.  */
  52     va_start (vp, b); /* { dg-warning "undefined behaviour" } */
  53     va_end (vp);
  54 }