clang/test/Sema/attr-warning.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 #if !__has_attribute(warning)
   3 #warning "warning attribute missing"
   4 #endif
   5
   6 __attribute__((warning("don't call me!"))) int good0(void);
   7
   8 __attribute__((warning)) // expected-error {{'warning' attribute takes one argument}}
   9 int
  10 bad0(void);
  11
  12 int bad1(__attribute__((warning("bad1"))) int param); // expected-error {{'warning' attribute only applies to functions}}
  13
  14 int bad2(void) {
  15   __attribute__((warning("bad2"))); // expected-error {{'warning' attribute cannot be applied to a statement}}
  16 }
  17
  18 __attribute__((warning(3))) // expected-error {{'warning' attribute requires a string}}
  19 int
  20 bad3(void);
  21
  22 __attribute__((warning("foo"), warning("foo"))) int good1(void);
  23 __attribute__((warning("foo"))) int good1(void);
  24 __attribute__((warning("foo"))) int good1(void) {}
  25
  26 __attribute__((warning("foo"), error("foo"))) // expected-error {{'error' and 'warning' attributes are not compatible}}
  27 int
  28 bad4(void);
  29 // expected-note@-3 {{conflicting attribute is here}}
  30
  31 /*
  32  * Note: we differ from GCC here; rather than support redeclarations that add
  33  * or remove this fn attr, we diagnose such differences.
  34  */
  35
  36 void foo(void);                                       // expected-note {{previous declaration is here}}
  37 __attribute__((warning("oh no foo"))) void foo(void); // expected-error {{'warning' attribute does not appear on the first declaration}}