gnu/dist/gcc4/gcc/testsuite/gcc.dg/cpp/avoidpaste2.c

   1 /* Copyright (C) 2001, 2003 Free Software Foundation, Inc.  */
   2
   3 /* { dg-do preprocess } */
   4
   5 /* This tests that we avoid accidental pasting, as well as gratuitous
   6    space insertion, in various nasty places _inside_ a macro's
   7    replacement list: on either side of a paste, and on either side of
   8    an argument.  It also tests that we don't pass empty macro leading
   9    whitespace to the next line - this problem use to break Emacs
  10    preprocessor abuse.
  11
  12    Neil Booth, 1 Feb 2001.  */
  13
  14 #define EMPTY_WITH_LEADING_SPACE
  15 #define f(x, y) :x: -y##> -##y>
  16 #define g(x, y) :x: :y##2 2##y:
  17
  18 /* This should preprocess as
  19
  20 : : : - > - >
  21 :2: :22 22:
  22
  23 We used to get a space at the start of the line.  */
  24
  25  EMPTY_WITH_LEADING_SPACE
  26 f(:,)
  27 g(2, 2)
  28
  29 /* { dg-final { scan-file avoidpaste2.i "(^|\\n): : : - > - >" } }
  30    { dg-final { scan-file avoidpaste2.i "(^|\\n):2: :22 22:" } } */