const-cfstring-1.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 30 行

/* APPLE LOCAL file constant CFStrings */
/* Test whether the __builtin__CFStringMakeConstantString 
   "function" fails gracefully when handed a non-constant
   argument.  This will only work on MacOS X 10.1.2 and later.  */
/* Developed by Ziemowit Laski <[e-mail]>.  */

/* { dg-do compile { target *-*-darwin* } } */
/* { dg-options "-fconstant-cfstrings" } */

typedef const struct __CFString *CFStringRef;

#ifdef __CONSTANT_CFSTRINGS__
#define CFSTR(STR)  ((CFStringRef) __builtin___CFStringMakeConstantString (STR))
#else
#error __CONSTANT_CFSTRINGS__ not defined
#endif

extern int cond;
extern const char *func(void);

const CFStringRef s0 = CFSTR("Hello" "there");

int main(void) {
  CFStringRef s1 = CFSTR("Str1");
  CFStringRef s2 = CFSTR(cond? "Str2": "Str3"); /* { dg-error "literal expression is not constant" } */
  CFStringRef s3 = CFSTR(func());  /* { dg-error "literal expression is not constant" } */

  return 0;
}