gcc/testsuite/gcc.dg/cpp/_Pragma1.c

   1 /* Copyright (C) 2000 Free Software Foundation, Inc.  */
   2
   3 /* { dg-do preprocess } */
   4
   5 /* Tests the _Pragma operator.  Contributed by Neil Booth 1 Nov 2000.  */
   6
   7 /* Within the preprocessor, the easy pragma to test is "poison".  */
   8
   9 #pragma GCC poison p1
  10 p1                              /* { dg-error "poisoned" } */
  11
  12 /* Standard use of _Pragma.  */
  13 _Pragma ("GCC poison p2")
  14 p2                              /* { dg-error "poisoned" } */
  15
  16 /* Don't interpret _Pragmas in directives.  The standard is not clear
  17    on this, but I think this makes most sense.  */
  18 #if 1 _Pragma (L"GCC poison p3") /* { dg-error "missing binary operator" } */
  19 p3
  20 #endif
  21
  22 #define M1 _Pragma ("GCC poison p4")
  23 p4                              /* No problem; not yet poisoned.  */
  24 #define M2(x) _Pragma (#x)
  25
  26 /* Now test macro expansion with embedded _Pragmas.  */
  27 M1 p4                           /* { dg-error "poisoned" } */
  28 M2 (GCC poison p5) p5           /* { dg-error "poisoned" } */
  29
  30 /* Not interpreting _Pragma in directives means they don't nest.  */
  31 _Pragma ("_Pragma (\"GCC poison p6\") GCC poison p7")
  32 p6
  33 p7
  34
  35 /* Check we ignore them in false conditionals.  */
  36 #if 0
  37 _Pragma ("GCC poison p8")
  38 #endif
  39 p8                              /* No problem.  */