gcc/testsuite/c-c++-common/nonnull-1.c

   1 /* Test for the bad usage of "nonnull" function attribute parms.  */
   2 /*  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-Wnonnull-compare" } */
   5
   6 #include <stddef.h>
   7 #include <stdlib.h>
   8
   9 void foo(void *bar) __attribute__((nonnull(1)));
  10
  11 void foo(void *bar) { if (!bar) abort(); } /* { dg-warning "nonnull argument" "bar compared to NULL" } */
  12
  13 extern int func (char *, char *, char *, char *) __attribute__((nonnull));
  14
  15 int
  16 func (char *cp1, char *cp2, char *cp3, char *cp4)
  17 {
  18   if (cp1) /* { dg-warning "nonnull argument" "cp1 compared to NULL" } */
  19     return 1;
  20
  21   if (cp2 == NULL) /* { dg-warning "nonnull argument" "cp2 compared to NULL" } */
  22     return 2;
  23
  24   if (NULL != cp3) /* { dg-warning "nonnull argument" "cp3 compared to NULL" } */
  25     return 3;
  26
  27   return cp4 != 0 ? 0 : 1; /* { dg-warning "nonnull argument" "cp4 compared to NULL" } */
  28 }
  29
  30 __attribute__((nonnull (1))) int
  31 func2 (char *cp)
  32 {
  33   return (cp != NULL) ? 1 : 0; /* { dg-warning "nonnull argument" "cp compared to NULL" { xfail c++ } } */
  34 }