pp31.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 48 行

#include "fail.h"
#include <stdio.h>
#include <string.h>

/* C99 macro argument placement example */

#define t(x,y,z) x ## y ## z
int j[] = { t(1,2,3), t(,4,5), t(6,,7), t(8,9,), t(10,,), t(,11,), t(,,12), t(,,) };

/*
The above should expand to:
int j[] = { 123, 45, 67, 89, 10, 11, 12, };
*/

#define g(x,...) x##__VA_ARGS__
#define h(x,y)   x##y

/* 1.4 erroneously warned in myfunc because T_BAD_TOKEN got through */
#define RETURN_ANY(r) return r
void myfunc(void)
{
     RETURN_ANY();
}

int ap, ple, apple;

int main( void ) {
    if( sizeof( j ) / sizeof( j[0] ) != 7 )
        fail(__LINE__);

    if( (j[0] != 123) || j[1] != 45 )
        fail(__LINE__);
    if( (j[2] != 67) || j[3] != 89 )
        fail(__LINE__);
    if( (j[4] != 10) || j[5] != 11 )
        fail(__LINE__);
    if( j[6] != 12 )
        fail(__LINE__);

    /* Some of the following used to crash the compiler */
    g(ap,ple) = apple;
    g(ap,)    = ap;
    g(,ple)   = ple;
    g(,) h(,)

    _PASS;
}