ATL / WTL / STL

 static void err_doit(int errnoflag, int level, const char* fmt, va_list ap)
{
        int errno_save, n;
        char buf[MAXLINE+1];

        errno_save = errno;     //value caller might want printed

        #ifdef  HAVE_VSNPRINTF
                vsnprintf(buf, MAXLINE, fmt, ap);       //this is safe
        #else
                vsprintf(buf, fmt, ap);         //this is not safe
        #endif

        n = strlen(buf);
        if(errnoflag)
                snprintf((char*)(buf+n), MAXLINE-n, ";%s", strerror(errno_save));
        strcat(buf, "\n");
        //const char* temp = buf;
        if(daemon_proc)
        {
                syslog(level, (const char*)buf);                //98
                //syslog(level, temp);
        }
        else
        {
                fflush(stdout);         //in case stdout and stderr are the same
                fputs(buf, stderr);
                fflush(stderr);
        }

        return;
}
</pre>

the warnning is:
In file included from str_cli.c:2,
                 from tcpcli01.c:2:
error.c: In function ‘void err_doit(int, int, const char*, char*)’:
error.c:98: warning: format not a string literal and no format arguments

i this warning, for i don't make buf to (const char*), but  i try,  it don't work.
please give me some advices, thank you

//In.h
int sum(int a, int b);


//In.cpp

#include "In.h"

int sum(int a, int b)
{
        return (a+b);
}

#include "iostream"
#include "In.h"
using namespace std;

int main()
{
        int a = sum(1, 2);
        cout << a << endl;
}

~/cpp/test$ g++ -o test05 test05.cpp
/tmp/ccW55H4p.o: In function `main':
test05.cpp text+0x19): undefined reference to `sum(int, int)'
collect2: ld returned 1 exit status