Hi,
Thanks for the prompt reply. The compile warning is:
In file included from /usr/local/include/libssh2/libssh2.h:140:1: warning:
"INVALID_SOCKET" redefined
In file included from /usr/local/include/snmp_pp/snmp_pp.h:71,
from snmpThreadData.h:13,
from snmpThreadData.cpp:4:
/usr/local/include/snmp_pp/uxsnmp.h:49:1: warning: this is the location of the
previous definition
So the conflict is I end up with headers both from libssh2 and the snmp++
library (http://www.agentpp.com/snmp_pp3_x/snmp_pp3_x.html).
Libssh2 defines it as:
#define INVALID_SOCKET -1
and SNMP++ defines it as:
#ifndef INVALID_SOCKET
#define INVALID_SOCKET ((SnmpSocket)(~0)) // value for invalid socket
#endif
Note that the SNMP++ header has an #ifdef. If I make the libssh2 come first,
then the ifdef will stop it from being redefined... but it will be the wrong
value (and type) for SNMP++.
I'm sure I can craft a workaround. Mostly I was perplexed at why two different
libraries which are otherwise both disciplined about defining their constants
with a namespace prefix both chose to define this one symbol like this, like it
was some magical special symbol that everyone knew about.
- matt
--- On Fri, 3/2/12, Alexander Lamaison <sw...@lammy.co.uk> wrote:
> From: Alexander Lamaison <sw...@lammy.co.uk>
> Subject: Re: INVALID_SOCKET symbol conflict
> To: "libssh2 development" <libssh2-devel@cool.haxx.se>
> Date: Friday, March 2, 2012, 7:43 AM
> On 2 March 2012 15:13, Lawson <lawso...@yahoo.com>
> wrote:
> >
> > I notice that nearly all the defines in libssh2.h use
> the LIBSSH2_ prefix, except for INVALID_SOCKET. It seems
> to be on purpose but I don't understand why. Is it a
> Windows thing?
>
> It is a Windows Winsock constant that represents the only
> value
> returned by socket() that is guaranteed not to be a valid
> socket
> handle. libssh2 defines it in the header for other
> platforms to help
> with portable programming.
>
> > My issue is that I'm writing an application (on Linux)
> which includes headers from multiple libraries, and some of
> them also set this symbol to a conflicting value.
>
> I believe the difference is because on some platforms
> sockets are
> signed ints and others they are unsigned ints. Can you
> give more
> details about the conflict. Error messages etc.
>
> Alex
>
> --
> Easy SFTP for Windows Explorer (http://www.swish-sftp.org)
>
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