ntohl is not a function

[James Morrison]

 Hi,

  I've noticed while compiling the hurd source that gcc3 gives the following
warning:
 p++.c:17: warning: operation on `p' may be undefined
 p++.c:17: warning: operation on `p' may be undefined
 p++.c:17: warning: operation on `p' may be undefined

on the following line:
  high = ntohl (*p++);
.

If <netinet.h> is not included then then this warning is not found.  Also if
there
are no optimizations then this warning does not occur.  From looking at 
libc/inet/netinet/in.h and libc/sysdeps/i386/bits/byteswap.h I have decided I
don't know what is causing this warnings, it should be in __bswap_32.

 Here is the code I have been using to test this:
#include <stdlib.h>
#include <stdio.h>
#include <netinet/in.h>

int main (int argc, char *argv[])
{
        int *p = malloc (12);
        int n;
        
        memset (p, 0, 12);
        *p++ = 3;
        n = ntohl (*p++);
        p--;
        *p = n;
        printf ("%p: %d\n", p, *p);
        p--;
        printf ("%p:%d\n", p, *p);

        return 0;
}

with the following lines to compile it give warnings.
 gcc -O3 -Wall -march=i386 -o p++ p++.c
 gcc -O3 -Wall -march=i486 -o p++ p++.c
 gcc -O3 -Wall -o p++ p++.c


=====
James Morrison
   University of Waterloo
   Computer Science - Digital Hardware
   2A co-op
http://hurd.dyndns.org

Anyone refering this as 'Open Source' shall be eaten by a GNU

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