clang/test/Sema/implicit-decl-c90.c

   1 // RUN: %clang_cc1 %s -std=c90 -verify -fsyntax-only
   2 void t0(int x) {
   3   int explicit_decl(void);
   4   int (*p)(void);
   5   if(x > 0)
   6     x = g() + 1; // expected-note {{previous implicit declaration}}
   7   p = g;
   8   if(x < 0) {
   9     extern void u(int (*)[h()]);
  10     int (*q)(void) = h;
  11   }
  12   p = h; /* expected-error {{use of undeclared identifier 'h'}} */
  13 }
  14
  15 void t1(int x) {
  16   int (*p)(void);
  17   switch (x) {
  18     g();
  19   case 0:
  20     x = h() + 1;
  21     break;
  22   case 1:
  23     p = g;
  24     p = h;
  25     break;
  26   }
  27   p = g; /* expected-error {{use of undeclared identifier 'g'}} */
  28   p = h; /* expected-error {{use of undeclared identifier 'h'}} */
  29   explicit_decl();
  30   p = explicit_decl;
  31 }
  32
  33 int t2(int x) {
  34   int y = ({ if (x > 0) x = g() + 1; 2*x; });
  35   int (*p)(void) = g; /* expected-error {{use of undeclared identifier 'g'}} */
  36   return y;
  37 }
  38
  39 int PR34822(void) {
  40   {int i = sizeof(PR34822_foo());} /* expected-note {{previous definition is here}} */
  41   {extern int PR34822_foo;} /* expected-error {{redefinition of 'PR34822_foo' as different kind of symbol}} */
  42
  43   {extern int PR34822_bar;} /* expected-note {{previous declaration is here}} */
  44   {int i = sizeof(PR34822_bar());} /* expected-warning {{use of out-of-scope declaration of 'PR34822_bar' whose type is not compatible with that of an implicit declaration}} expected-error {{called object type 'int' is not a function or function pointer}} */
  45 }
  46
  47 int (*p)(void) = g; /* expected-error {{use of undeclared identifier 'g'}} */
  48 int (*q)(void) = h; /* expected-error {{use of undeclared identifier 'h'}} */
  49
  50 float g(void); /* expected-error {{conflicting types for 'g'}} */