#1603 largefile support breaks the build

[Thomas Anders]

Building the agent with largefile support (usually
"-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64") breaks
the build (at compile time, not configure time) in all
CVS branches.

This especially prevents us from being able to turn on
embedded perl by default, since perl is usually
compiled with largefile support which breaks the
net-snmp build.

Example compile errors on Solaris:

"/usr/include/sys/swap.h", line 50: #error: "Cannot use
swapctl in the large files compilation environment"
cc: acomp failed for
/home/anders/src/net-snmp-5.3.1.pre1/agent/mibgroup/ucd-snmp/memory_solaris2.c

/usr/include/sys/procfs.h:43:2: error: #error "Cannot
use procfs in the large file compilation environment"
gmake[2]: *** [host/hr_swrun.lo] Error 1

A workaround is to "configure
--with-out-mib-modules=host,ucd_snmp" (tested
successfully on Solaris), but this is hardly acceptable
as it results in very limited agent functionality.

Please also see bug 1347709 ("snmpd doesnt handle large
log files (>= 2GB) gracefully") and README.solaris for
further information on largefile issues.

[Thomas Anders]

Logged In: YES
user_id=848638

One workaround (if you prefer largefile/embedded perl
support over other agent functionality) is to:

configure
--with-out-mib-modules=ucd-snmp/memory,ucd-snmp/memory_solaris2,ucd-snmp/proc,host/hr_swrun,host/hr_storage

Tested on Solaris 10/SPARC with 5.3.x CVS.

[James Holtom]

If you need to go to a newer version, v5.4.3 (as taken from sourceforge source code), can also be persuaded to do largefile/embedded -- again at the cost of MIBs.
You'll need to hack-out the largefile checks in configure:

--- net-snmp-5.4.3/configure Sun May 23 14:10:00 2010
+++ net-snmp-5.4.3/configure Mon Jul 12 05:57:45 2010
@@ -32215,25 +32215,25 @@
# check the compiler flags for illegal tokens
case $target_os in
solaris*)
- if test "x$embed_perl" != "xno" ; then
- #
- # Perl cc checks
- #
- echo "$as_me:$LINENO: checking for problematic Perl cc flags on Suns" >&5
-echo $ECHO_N "checking for problematic Perl cc flags on Suns... $ECHO_C" >&6
- if $myperl -V:ccflags | grep LARGEFILE > /dev/null ; then
- if test "x$embed_perl" = "xtry" ; then
- embed_perl="no"
- else
- { { echo "$as_me:$LINENO: error: Perl was compiled with LARGEFILE support which will break Net-SNMP. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether." >&5
-echo "$as_me: error: Perl was compiled with LARGEFILE support which will break Net-SNMP. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether." >&2;}
- { (exit 1); exit 1; }; }
- fi
- else
- echo "$as_me:$LINENO: result: none known" >&5
-echo "${ECHO_T}none known" >&6
- fi
- fi
+# if test "x$embed_perl" != "xno" ; then
+# #
+# # Perl cc checks
+# #
+# echo "$as_me:$LINENO: checking for problematic Perl cc flags on Suns" >&5
+#echo $ECHO_N "checking for problematic Perl cc flags on Suns... $ECHO_C" >&6
+# if $myperl -V:ccflags | grep LARGEFILE > /dev/null ; then
+# if test "x$embed_perl" = "xtry" ; then
+# embed_perl="no"
+# else
+# { { echo "$as_me:$LINENO: error: Perl was compiled with LARGEFILE support which will break Net-SNMP. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether." >&5
+#echo "$as_me: error: Perl was compiled with LARGEFILE support which will break Net-SNMP. Either set the environment variable PERLPROG to a different perl binary or use --disable-embedded-perl to turn off embedded Perl functionality altogether." >&2;}
+# { (exit 1); exit 1; }; }
+# fi
+# else
+# echo "$as_me:$LINENO: result: none known" >&5
+#echo "${ECHO_T}none known" >&6
+# fi
+# fi
;;

 \*\)

And then configure using:

configure --prefix=/usr/local --with-mib-modules="smux mibII/mta_sendmail" --with-defaults --enable-ipv6 --with-out-mib-modules="ucd_snmp host mibII/ipv6 ucd_snmp/memory ucd_snmp/memory_solaris2 ucd_snmp/proc host/hr_swrun host/hr_storage" --with-perl-modules --enable-embedded-perl --disable-perl-cc-checks --enable-shared

Which compiled and worked for me.

[Dagobert Michelsen]

If I read lfcompile64(5) correctly it should be possible to build a Perl in 64 bit which always has largefiles enabled. As the header files for kernel access now work in a sane way it should be possible to embed this perl in a 64 bit netsnmp, right?

Best regards

-- Dago