Hi Niels Baggesen:
Thanks for responding.
Yes, I will try 5.7.2.rc2 and update you.
Regarding the availability of Symbols CMSG_SPACE and CMSG_LEN, here are
some details.
Here are my configuration options.
LDFLAGS="-rpath=\$$ORIGIN:/usr/lib:/usr/local/lib:/lib" LIBS="-lz -lcrypto
-lpthread" ./configure --prefix=/home/build/mnathan/netsnmp_staging
--exec-prefix=/home/build/mnathan/netsnmp_exec
--libdir=/home/build/mnathan/netsnmp_exec/lib
--with-mibdirs=/usr/dragon/.snmp/mibs:/opt/dragon/share/snmp/mibs:./../docs
--enable-ipv6 --enable-reentrant --with-default-snmp-version="3"
--with-sys-contact="dl-ids_escalat...@enterasys.com"
--with-sys-location="Unknown" --with-logfile="/var/log/snmpd.log"
--with-persistent-directory="/var/net-snmp" --disable-embedded-perl
--disable-shared
The prefix and exec-prefix options above are purposely set to be in the
user space because we have a special build area we need to manually
populate once the libnetsnmp.so.30 gets correctly built.
Within net-snmp the symbols are defined in
include/net-snmp/library/snmp_transport.h
#if defined(solaris2)
# ifndef CMSG_SPACE
# define CMSG_SPACE(l) \
((unsigned int)_CMSG_HDR_ALIGN(sizeof (struct cmsghdr) + (l)))
# define CMSG_LEN(l) (_CMSG_HDR_ALIGN(sizeof(struct cmsghdr)) + (l))
# endif
#endif
#endif /* HAVE_SYS_SOCKET_H */
This is running on AIX so HAVE_SYS_SOCKET_H should be the chosen path to
get these symbols. The platform type is aix5.
Within my Aix, whose uname -a output is as follows,
AIX drbld-aix 2 5 00CA5AAE4C00
The symbols above are in /usr/include/sys/socket.h
Here is the config.log output written by executing the ./configure and
pertaining to sys/socket.h
configure:16172: checking sys/socket.h usability
configure:16172: gcc -c -fno-strict-aliasing -g -O2 -Uaix5 -Daix5=aix5
conftest
.c >&5
configure:16172: $? = 0
configure:16172: result: yes
configure:16172: checking sys/socket.h presence
configure:16172: gcc -E conftest.c
configure:16172: $? = 0
configure:16172: result: yes
configure:16172: checking for sys/socket.h
configure:16172: result: yes
Here are the lines in /usr/include/sys/socket.h
/*
* CMSG_ALIGN, CMSG_SPACE, CMSG_LEN
* Added for Linux compatibility.
*/
#ifdef _LINUX_SOURCE_COMPAT
#define CMSG_ALIGN _CMSG_ALIGN
#define CMSG_SPACE(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) +
_CMSG_ALIGN(len))
#define CMSG_LEN(len) (_CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
#endif /* _LINUX_SOURCE_COMPAT */
So, it seems to indicate the need for the Linux compatibility flag to be
included in CFLAGS. One of the configure option is --oldincludedir and the
fact that it is oldincludedir raises some concern. Even including that did
not resolve it. I recall that when I included
--oldincludesdir=/usr/include it resulted in undefined symbols
for CMSG_ALIGN. I did not further try to resolve that because I was not
sure about including the --oldincludedir option. I expected that to be
flagged automatically by configure.
Please note that the net-snmp-5.7.1/snmplib does build, but,
net-snmp-5.7.1/agent is the one that fails this way.
[ I am thinking that the agent side code does use these symbols but the
snmplib side does not so the link time fails on the agent side. I have not
verified that]
Thanks
Mukund
On Tue, Sep 4, 2012 at 12:51 AM, Niels Baggesen
<n...@users.sourceforge.net>wrote:
> On Mon, Sep 03, 2012 at 08:20:02PM -0400, Nathan, Mukund wrote:
> > CMSG_SPACE and CMSG_LEN are macro defined in an include file
> >
> > ~/net-snmp-5.7.1/include/net-snmp/library/snmp_transport.h
> >
> > CMSG_SPACE is defined for solaris platform and sys/socket.h is expected
> for
> > non solaris.
>
> Are the two symbols defined in any of the system include files?
>
> What options did you give to confidure?
>
> Could you please try the same with the current 5.7.2.rc2 release
> candidate?
>
> /Niels
>
> --
> Niels Baggesen - @home - Århus - Denmark - n...@users.sourceforge.net
> The purpose of computing is insight, not numbers --- R W Hamming
>
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