gcc/testsuite/gcc.dg/cpp/spacing1.c

   1 /* Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.  */
   2
   3 /* { dg-do preprocess } */
   4
   5 /* This tests correct spacing of macro expansion output, as well as
   6    the line it falls on.  This is quite subtle; it involves newlines
   7    within macro arguments becoming spaces, but not if it turns out to
   8    not be a macro invocation.  Also, multiple macro invocations spread
   9    across many lines.
  10
  11    Neil Booth, 1 Dec 2000, 23 Sep 2001.  */
  12
  13 /* The actual location of the expansion of a multi-line macro
  14    invocation is not defined: we might consider them to be in the same
  15    line as the initial token of the invocation, or as the final token
  16    of the invocation, or even anything in between.  We choose to make
  17    it the initial token, such that everything that is in a logical
  18    line ends up in a single line after preprocessing.
  19
  20    Alexandre Oliva, Sept 13, 2003.  */
  21
  22 #define str(x) #x
  23 #define f(x) x
  24 #define glue(x, y) x ## y
  25 #define EMPTY
  26 /* These are based on PR 4492, we mustn't lose padding tokens when
  27    scanning ahead for a '(' and failing to find it.  */
  28 #define A(x) B x
  29 #define B(x)
  30 #define C A
  31 #define D() A
  32
  33 /* The correct output is shown here.  Note the spaces, and the way
  34    everything after the invocation of f appears on the same line.
  35
  36  44 ;
  37 B Q B Q A Q A:
  38 f
  39 bar
  40 A
  41 bad
  42 g "1 2" bam baz
  43
  44 */
  45
  46 glue (EMPTY 4, 4) EMPTY;
  47 A(Q) C(Q) D()Q D():
  48 f
  49 bar
  50 A
  51 bad
  52 f (g) str
  53 (
  54 1
  55 2
  56 ) f
  57 (bam) baz
  58
  59 /* { dg-final { scan-file spacing1.i " 44 ;" } }
  60    { dg-final { scan-file spacing1.i "B Q B Q A Q A:" } }
  61    { dg-final { scan-file-not spacing1.i "f\[^\n\]*bar" } }
  62    { dg-final { scan-file spacing1.i "(^|\n)bar" } }
  63    { dg-final { scan-file spacing1.i "(^|\n)A($|\n)" } }
  64    { dg-final { scan-file spacing1.i "(^|\n)bad($|\n)" } }
  65    { dg-final { scan-file spacing1.i "g \"1 2\" bam baz" } } */