1  /* PR c/94040 - ICE on a call to an invalid redeclaration of strftime
       2     { dg-do compile }
       3     { dg-options "-Wall" } */
       4  
       5  typedef __SIZE_TYPE__ size_t;
       6  
       7  struct tm;
       8  
       9  size_t strftime (char *, size_t, int *, struct tm *);   // { dg-warning "-Wbuiltin-declaration-mismatch" }
      10  
      11  size_t call_strftime (char *d, size_t n, int *f, struct tm *t)
      12  {
      13    size_t r = 0;
      14    r += strftime (0, 0, 0, 0);
      15    r += strftime (d, 0, 0, 0);
      16    r += strftime (d, n, 0, 0);
      17    r += strftime (d, n, f, 0);
      18    r += strftime (d, n, f, t);
      19    return r;
      20  }
      21  
      22  
      23  char* strchr (char*, char*); // { dg-warning "-Wbuiltin-declaration-mismatch" }
      24  
      25  // Verify that missing/extra qualifiers aren't diagnosed without -Wextra.
      26  
      27  int strcmp (char*, char*);
      28  int strncmp (volatile char*, volatile char*, size_t);
      29  
      30  // Verify that a difference in pointers is diagnosed.
      31  
      32  size_t strlen (const char**);
      33  // { dg-warning "-Wbuiltin-declaration-mismatch" "pointer" { target *-*-* } .-1 }
      34  
      35   size_t strnlen (const char* const*, size_t);
      36  // { dg-warning "-Wbuiltin-declaration-mismatch" "pointer" { target *-*-* } .-1 }
      37  
      38  
      39  // Verify that calls to the compatibly-redeclared built-ins are treated
      40  // as those to the built-ins and diagnosed.
      41  
      42  int test_builtin_calls (size_t n)
      43  {
      44    int r = 0;
      45    r += strcmp ((char*)0, "");               // { dg-warning "\\\[-Wnonnull]" }
      46    r += strcmp ("", (char*)0);               // { dg-warning "\\\[-Wnonnull]" }
      47  
      48    r += strncmp ((char*)0, "", n);           // { dg-warning "\\\[-Wnonnull]" }
      49    r += strncmp ("", (char*)0, n);           // { dg-warning "\\\[-Wnonnull]" }
      50  
      51    return r;
      52  }
      53  
      54  
      55  // Verify that calls to the incompatibly-redeclared built-ins are not
      56  // treated as those to the built-ins by the middle-end.  It doesn't
      57  // matter if the front-end diagnoses them but the middle-end should
      58  // not because it shouldn't recognize them as built-ins.
      59  
      60  #pragma GCC optimize "2"
      61  
      62  size_t test_nonbuiltin_calls (char *s, int c)
      63  {
      64    void *null = 0;
      65  
      66    char *r;
      67    r = strchr ((char*)null, s);
      68    r = strchr (r, (char*)null);
      69    *s = *r;   // use the result
      70  
      71    size_t n = 0;
      72    n += strftime (0, 0, 0, 0);
      73    n += strlen ((const char**)null);
      74    n += strnlen ((const char**)null, n);
      75  
      76    return n;
      77  }