clang/test/Sema/implicit-builtin-decl.c

   1 // RUN: %clang_cc1 -fsyntax-only -Wno-strict-prototypes -verify %s
   2
   3 void f() {
   4   int *ptr = malloc(sizeof(int) * 10); // expected-warning{{implicitly declaring library function 'malloc' with type}} \
   5   // expected-note{{include the header <stdlib.h> or explicitly provide a declaration for 'malloc'}} \
   6   // expected-note{{'malloc' is a builtin with type 'void *}}
   7 }
   8
   9 void *alloca(__SIZE_TYPE__); // redeclaration okay
  10
  11 int *calloc(__SIZE_TYPE__, __SIZE_TYPE__); // expected-warning{{incompatible redeclaration of library function 'calloc'}} \
  12                     // expected-note{{'calloc' is a builtin with type 'void *}}
  13
  14
  15 void g(int malloc) { // okay: these aren't functions
  16   int calloc = 1;
  17 }
  18
  19 void h() {
  20   int malloc(int); // expected-warning{{incompatible redeclaration of library function 'malloc'}}
  21   int strcpy(int); // expected-warning{{incompatible redeclaration of library function 'strcpy'}} \
  22   // expected-note{{'strcpy' is a builtin with type 'char *(char *, const char *)'}}
  23 }
  24
  25 void f2() {
  26   fprintf(0, "foo"); // expected-warning{{declaration of built-in function 'fprintf' requires inclusion of the header <stdio.h>}} \
  27    expected-warning {{implicit declaration of function 'fprintf' is invalid in C99}}
  28 }
  29
  30 // PR2892
  31 void __builtin_object_size(); // expected-error{{conflicting types}} \
  32 // expected-note{{'__builtin_object_size' is a builtin with type}}
  33
  34 int a[10];
  35
  36 int f0() {
  37   return __builtin_object_size(&a); // expected-error {{too few arguments to function}}
  38 }
  39
  40 void * realloc(void *p, int size) { // expected-warning{{incompatible redeclaration of library function 'realloc'}} \
  41 // expected-note{{'realloc' is a builtin with type 'void *(void *,}}
  42   return p;
  43 }
  44
  45 // PR3855
  46 void snprintf(); // expected-warning{{incompatible redeclaration of library function 'snprintf'}} \
  47     // expected-note{{'snprintf' is a builtin}}
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52   snprintf();
  53 }
  54
  55 void snprintf() { }
  56
  57 void longjmp();
  58
  59 extern float fmaxf(float, float);
  60
  61 struct __jmp_buf_tag {};
  62 void sigsetjmp(struct __jmp_buf_tag[1], int);
  63
  64 // PR40692
  65 void pthread_create(); // no warning expected