gcc/testsuite/gcc.dg/Wbuiltin-declaration-mismatch-8.c

   1 /* PR c/86125 - missing -Wbuiltin-declaration-mismatch on a mismatched
   2    return type
   3    Verify that declarations of file I/O built-ins with different
   4    definitions of struct FILE triggers -Wbuiltin-declaration-mismatch
   5    when -Wextra is specified.
   6    { dg-do compile }
   7    { dg-options "-Wall -Wbuiltin-declaration-mismatch" } */
   8
   9 struct FooFile;
  10 int fputc (int, struct FooFile*);
  11
  12 typedef struct FooFile AlsoFooFile;
  13 int fprintf (AlsoFooFile*, const char*, ...);
  14
  15 typedef AlsoFooFile* FooFilePtr;
  16 int fscanf (FooFilePtr, const char*, ...);
  17
  18 /* No warning here (-Wextra not specified).  */
  19 struct BarFile;
  20 int vfprintf (struct BarFile*, const char*, __builtin_va_list);
  21
  22
  23 /* Set -Wextra and verify -Wbuiltin-declaration-mismatch is issued.  */
  24 #pragma GCC diagnostic warning "-Wextra"
  25
  26 int fputs (const char*, struct BarFile*);   /* { dg-warning "mismatch in argument 2 type of built-in function .fputs.; expected .struct FooFile \\\*." } */