Examples/test-suite/preproc_defined.i

%module preproc_defined

// Check 'defined' passes through the preprocessor without being processed like '#if defined(ABC)' would be (SF bug #1940536)

%define DEFINED_MACRO
%{
  int defined(int b) { 
    return b > 10;
  }
  int vvv = -1;
  void fn(int val) {
    if (defined(val))
      vvv = 1;
    else
      vvv = 0; 
  }
%}
%enddef

DEFINED_MACRO

%{
int checking(void) {
  int okay;
  fn(11);
  okay = (vvv == 1);
  fn(9);
  okay = okay && (vvv == 0);
  return okay; /* should be 1 */
}
%}

%inline %{
int call_checking(void) {
  return checking();
}
%}

/*****************************************************************************/
/* Check #if/#elif defined() macro expansions
   Also checks #if/#elif defined() works correctly within macros... this is not
   standard C, but is now relied on in the SWIG library. */
/*****************************************************************************/

#define AAA
#define BBB
#define CCC

#if defined(AAA)\
&& defined(BBB) \
&& defined(CCC)
%{
void thing(int i) {}
void stuff(int i) {}
struct Defined {
  int defined;
};
void bumpf(int i) {}
%}
#else
#endif

%define ANOTHER_MACRO(TYPE)

#if defined(AAA) && defined(BBB) && defined(CCC)
void thing(TYPE) {}
#else
void thing_not(TYPE) {}
#endif

#if defined(AAA) &&\
 defined(BBB) \\
&& defined(CCC)
void stuff(TYPE) {}
#else
void stuff_not(TYPE);
#endif

#if defined(0)
void defined_not(TYPE);
#elif defined(AAA) && defined( BBB ) && defined(CCC)
struct Defined {
  int defined;
};
#else
void defined_not(TYPE);
#endif

#if !( defined(AAA) &&\
 defined(BBB) \\
&& defined(CCC) )
void bumpf_not(TYPE);
#else
void bumpf(TYPE) {}
#endif

%enddef

ANOTHER_MACRO(int)

%{
void another_macro_checking(void) {
  struct Defined d;
  d.defined = 10;
  (void)d;
  thing(10);
  stuff(10);
  bumpf(10);
}
%}

/* Check that unknown preprocessor directives are ignored inside an inactive
 * conditional (github issue #394).
 */
#ifdef APPLE_OPENGL
# import <OpenGLES/ES1/gl.h>
#endif
#ifdef AAA
# define B
#else
# wibble wibble
#endif
#if 0
# wobble wobble
#endif

/* Check that #error is ignored inside an inactive conditional. */
#ifdef THIS_IS_NOT_DEFINED
# error should not trigger 1
#endif
#ifdef AAA
# define B
#else
# error should not trigger 2
#endif
#if 0
# error should not trigger 3
#endif

/* Check that #warning is ignored inside an inactive conditional. */
#ifdef THIS_IS_NOT_DEFINED
# warning should not trigger 1
#endif
#ifdef AAA
# define B
#else
# warning should not trigger 2
#endif
#if 0
# warning should not trigger 3
#endif


/* Regression test for https://sourceforge.net/p/swig/bugs/1163/
 * ONE(1)(2) should expand to `2` but SWIG was expanding it to `TWO(2)`
 * which results in the generated C wrapper failing to compile.
 */
#define ONE(X) TWO
#define TWO(X) X
%constant int a = ONE(1)(2);
#define XXX TWO
%constant int b = XXX(42);
#undef ONE
#undef TWO

/*
 * The behaviour of Self-Referential Macros is defined
 * https://gcc.gnu.org/onlinedocs/gcc-4.8.5/cpp/Self-Referential-Macros.html
 */
%inline %{
const int y = 0;
%}

#define x (4 + y)
#define y (2 * x)

%constant int z = y;

#undef y
#undef x

/* Regression test for #ifdef and #ifndef not working inside a %define.
 * https://github.com/swig/swig/issues/2183
 */
#undef THISMACROISNOTDEFINED /* Make sure! */
#define THISMACROISDEFINED

%define %test()

#ifdef THISMACROISNOTDEFINED
# error #ifdef inside percent-define failed
#endif
#ifndef THISMACROISDEFINED
# error #ifndef inside percent-define failed
#endif
/* Check pre-defined macro too. */
#ifndef SWIG
# error #ifndef inside percent-define failed
#endif

/* These cases already worked, but should still have test coverage. */
#if defined THISMACROISNOTDEFINED
# error #if defined inside percent-define failed
#endif
#if !defined THISMACROISDEFINED
# error #if !defined inside percent-define failed
#endif
/* Check pre-defined macro too. */
#if !defined SWIG
# error #if !defined inside percent-define failed
#endif

%enddef

%test()