Is this a bug with glibc (ntohl, ntohs, ...)?

[Eray Ozkural <erayo@cs.bilkent.edu.tr>]

Hi,

I was trying to compile a program. In a header the following preprocessor
includes are employed

#include <cstdio>
#include <cstdlib>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string>
#include <linux/cdrom.h>
#include <signal.h>
#include <netinet/in.h>
<snip>

I get the following error messages:

In file included from vcd.h:31,
                 from vcd.cpp:18:
/usr/include/netinet/in.h:285: warning: `ntohl' redefined
/usr/include/linux/byteorder/generic.h:169: warning: this is the location of the previous definition
/usr/include/netinet/in.h:286: warning: `ntohs' redefined
/usr/include/linux/byteorder/generic.h:175: warning: this is the location of the previous definition
/usr/include/netinet/in.h:287: warning: `htonl' redefined
/usr/include/linux/byteorder/generic.h:168: warning: this is the location of the previous definition
/usr/include/netinet/in.h:288: warning: `htons' redefined
/usr/include/linux/byteorder/generic.h:174: warning: this is the location of the previous definition
In file included from vcd.h:31,
                 from vcd.cpp:18:
/usr/include/netinet/in.h:259: parse error before `)'
/usr/include/netinet/in.h:259: parse error before `?'
/usr/include/netinet/in.h:259: parse error before `)'
/usr/include/netinet/in.h:260: parse error before `)'
/usr/include/netinet/in.h:260: parse error before `?'
/usr/include/netinet/in.h:260: parse error before `)'
/usr/include/netinet/in.h:262: parse error before `)'
/usr/include/netinet/in.h:262: parse error before `?'
/usr/include/netinet/in.h:262: parse error before `)'
/usr/include/netinet/in.h:264: parse error before `)'
/usr/include/netinet/in.h:264: parse error before `?'
/usr/include/netinet/in.h:264: parse error before `)'
In file included from vcd.h:31,
                 from vcd.cpp:18:
/usr/include/netinet/in.h:367: parse error before `}'


Could someone please reproduce this?

Since the files in which the byteorder conversion routines
are defined happen to be both in glibc, I want to ask
whether it is a bug with glibc or this particular program.
It is in C++ but I guess it would recur with C.

The program is mpegorion, you can check it out from their
home page creworion.net If I can get it to run I'm going to
ITP it... So, this is a tentative ITP. Not many proper VCD/DVD
players in Debian. :/ What a waste of time.

I had encountered similar "previously defined" errors in the past
while compiling a kernel module. I'd assumed that it was an error
of that code, but now that I see it again...

I'm not on the list, please Cc: to me.

Thanks,

Note 1:
orion:mpeg_orion$ dpkg -s libc6-dev
Package: libc6-dev
Status: install ok installed
Priority: standard
Section: devel
Installed-Size: 9298
Maintainer: Ben Collins <bcollins@debian.org>
Source: glibc
Version: 2.2.2-1
...

Note 2:
The kernel module was 3com's 3c90x driver, I was trying to port it
to 2.4 You can obtain the driver code from 3com's related web page.

-- 
Eray (exa) Ozkural
Comp. Sci. Dept., Bilkent University, Ankara
e-mail: erayo@cs.bilkent.edu.tr
www: http://www.cs.bilkent.edu.tr/~erayo