/* u_1_19.c:    Undefined behaviors on undefined #define and #undef syntax. */

#include    <stdio.h>

main( void)

{

/* u.1.19:  A macro expanded to "defined" in #if expression.    */

#define DEFINED     defined

#if     DEFINED DEFINED

#endif

#undef  __linux__

#undef  __arm__

#define __linux__   1

#define HAVE_MREMAP defined(__linux__) && !defined(__arm__)

/* Wrong macro definition.

 * This macro should be defined as follows.

 *  #if defined(__linux__) && !defined(__arm__)

 *  #define HAVE_MREMAP 1

 *  #endif

 */

#if HAVE_MREMAP

    mremap();

#endif

/* u.1.20:  Undefining __FILE__, __LINE__, __DATE__, __TIME__, __STDC__ or

        "defined" in #undef directive.  */

#undef  __LINE__

/*  31 or other undefined result.   */

    printf( "%d\n", __LINE__);

/* u.1.21:  Defining __FILE__, __LINE__, __DATE__, __TIME__, __STDC__ or

        "defined" in #define directive. */

#define __LINE__    1234

/*  37 or other undefined result.   */

    printf( "%d\n", __LINE__);

#define defined     defined

#if     defined defined

#   error   I am not a good preprocessor.

#endif

    return  0;

}