gnu/dist/gcc4/gcc/testsuite/gcc.dg/cpp/mi6.c

   1 /* Another test case for over-eager multiple include optimization,
   2    where the leading "#if !defined" expression is obtained partially,
   3    or wholly, from macros.  Neil Booth, 30 Sep 2001.  */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "" } */
   7
   8 extern void abort (void);
   9
  10 /* Each include file should not be subject to MI optimisation, since
  11    macro definitions can change.  Each header increments the variable
  12    VAR if it is defined.
  13
  14    The first set of inclusions gets the headers into CPP's cache, but
  15    does nothing since VAR is not defined.  The second set should each
  16    increment VAR, since none of the initial set should have been
  17    flagged as optimizable.  */
  18
  19 #define EMPTYL
  20 #define EMPTYR
  21 #define NOT !
  22 #define DEFINED defined (guard)
  23 #define NOT_DEFINED ! defined (guard)
  24
  25 #include "mi6a.h"
  26 #include "mi6b.h"
  27 #include "mi6c.h"
  28 #include "mi6d.h"
  29 #include "mi6e.h"
  30
  31 /* Define the macro guard, and redefine the macros to something that
  32    forces compilation of the conditional blocks.  */
  33 #define guard
  34 #undef EMPTYL
  35 #define EMPTYL 1 ||
  36 #undef EMPTYR
  37 #define EMPTYR || 1
  38 #undef NOT
  39 #define NOT
  40 #undef DEFINED
  41 #define DEFINED 0
  42 #undef NOT_DEFINED
  43 #define NOT_DEFINED 1
  44
  45 #define VAR five
  46
  47 int
  48 main(void)
  49 {
  50   unsigned int five = 0;
  51
  52 #include "mi6a.h"
  53 #include "mi6b.h"
  54 #include "mi6c.h"
  55 #include "mi6d.h"
  56 #include "mi6e.h"
  57
  58   if (five != 5)
  59     abort ();
  60   return 0;
  61 }