clang/test/Headers/stddefneeds.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -triple x86_64-apple-macosx10.9.0 -verify -Wsentinel -std=c++11 %s
   2
   3 ptrdiff_t p0; // expected-error{{unknown}}
   4 size_t s0; // expected-error{{unknown}}
   5 void* v0 = NULL; // expected-error{{undeclared}}
   6 wint_t w0; // expected-error{{unknown}}
   7 max_align_t m0; // expected-error{{unknown}}
   8
   9 #define __need_ptrdiff_t
  10 #include <stddef.h>
  11
  12 ptrdiff_t p1;
  13 size_t s1; // expected-error{{unknown}}
  14 void* v1 = NULL; // expected-error{{undeclared}}
  15 wint_t w1; // expected-error{{unknown}}
  16 max_align_t m1; // expected-error{{unknown}}
  17
  18 #define __need_size_t
  19 #include <stddef.h>
  20
  21 ptrdiff_t p2;
  22 size_t s2;
  23 void* v2 = NULL; // expected-error{{undeclared}}
  24 wint_t w2; // expected-error{{unknown}}
  25 max_align_t m2; // expected-error{{unknown}}
  26
  27 #define __need_NULL
  28 #include <stddef.h>
  29
  30 ptrdiff_t p3;
  31 size_t s3;
  32 void* v3 = NULL;
  33 wint_t w3; // expected-error{{unknown}}
  34 max_align_t m3; // expected-error{{unknown}}
  35
  36 // Shouldn't bring in wint_t by default:
  37 #include <stddef.h>
  38
  39 ptrdiff_t p4;
  40 size_t s4;
  41 void* v4 = NULL;
  42 wint_t w4; // expected-error{{unknown}}
  43 max_align_t m4;
  44
  45 #define __need_wint_t
  46 #include <stddef.h>
  47
  48 ptrdiff_t p5;
  49 size_t s5;
  50 void* v5 = NULL;
  51 wint_t w5;
  52 max_align_t m5;
  53
  54
  55 // linux/stddef.h does something like this for cpp files:
  56 #undef NULL
  57 #define NULL 0
  58
  59 // Including stddef.h again shouldn't redefine NULL
  60 #include <stddef.h>
  61
  62 // gtk headers then use __attribute__((sentinel)), which doesn't work if NULL
  63 // is 0.
  64 void f(const char* c, ...) __attribute__((sentinel)); // expected-note{{function has been explicitly marked sentinel here}}
  65 void g() {
  66   f("", NULL); // expected-warning{{missing sentinel in function call}}
  67 }
  68
  69 // glibc (and other) headers then define __need_NULL and rely on stddef.h
  70 // to redefine NULL to the correct value again.
  71 #define __need_NULL
  72 #include <stddef.h>
  73
  74 void h() {
  75   f("", NULL);  // Shouldn't warn.
  76 }