编译环境Mingw，gcc -c test.c报错，去掉注释的那行可以通过。是编译器太老的关系吗？

#include <stdio.h>
#include <stdlib.h>

// #ifndef HAVE_ERRX
static inline void errmsg(char doexit, int excode, char adderr, const char *fmt, ...);
int colormode_or_err(const char *str, const char *errmsg);

#define errx(E, FMT...) errmsg(1, E, 0, FMT)

// #endif

//#ifndef HAVE_ERR_H

static inline void errmsg(char doexit, int excode, char adderr, const char *fmt, ...)
{
   
    fprintf(stderr, "%s: ", "program_invocation_short_name.\n");
    if (fmt != NULL) {
//        va_list argp;
//        va_start(argp, fmt);
//        vfprintf(stderr, fmt, argp);
//        va_end(argp);

        if (adderr)
            fprintf(stderr, ": ");
    }
    if (adderr)
        fprintf(stderr, "%m");
    fprintf(stderr, "\n");
    if (doexit)
        exit(excode);
        
}

int colormode_or_err(const char *str, const char *errmsg)
{
    const char *p = str && *str == '=' ? str + 1 : str;
    int colormode;

    colormode = colormode_from_string(p);
    if (colormode < 0)
        errx(EXIT_FAILURE, "%s: '%s'", errmsg, p);     // 这行为什么编译通不过啊
    return colormode;
}