test/Preprocessor/macro_paste_bad.c

   1 // RUN: %clang_cc1 -Eonly -verify -pedantic %s
   2 // pasting ""x"" and ""+"" does not give a valid preprocessing token
   3 #define XYZ  x ## +
   4 XYZ   // expected-error {{pasting formed 'x+', an invalid preprocessing token}}
   5 #define XXYZ  . ## test
   6 XXYZ   // expected-error {{pasting formed '.test', an invalid preprocessing token}}
   7
   8 // GCC PR 20077
   9
  10 #define a   a ## ## // expected-error {{'##' cannot appear at end of macro expansion}}
  11 #define b() b ## ## // expected-error {{'##' cannot appear at end of macro expansion}}
  12 #define c   c ##    // expected-error {{'##' cannot appear at end of macro expansion}}
  13 #define d() d ##    // expected-error {{'##' cannot appear at end of macro expansion}}
  14
  15
  16 #define e   ## ## e // expected-error {{'##' cannot appear at start of macro expansion}}
  17 #define f() ## ## f // expected-error {{'##' cannot appear at start of macro expansion}}
  18 #define g   ## g    // expected-error {{'##' cannot appear at start of macro expansion}}
  19 #define h() ## h    // expected-error {{'##' cannot appear at start of macro expansion}}
  20 #define i   ##      // expected-error {{'##' cannot appear at start of macro expansion}}
  21 #define j() ##      // expected-error {{'##' cannot appear at start of macro expansion}}
  22
  23 // Invalid token pasting.
  24 // PR3918
  25
  26 // When pasting creates poisoned identifiers, we error.
  27 #pragma GCC poison BLARG
  28 BLARG  // expected-error {{attempt to use a poisoned identifier}}
  29 #define XX BL ## ARG
  30 XX     // expected-error {{attempt to use a poisoned identifier}}
  31
  32 #define VA __VA_ ## ARGS__
  33 int VA;   // expected-warning {{__VA_ARGS__ can only appear in the expansion of a C99 variadic macro}}
  34
  35