cyrus-imapd-2.5 build broken at 865199d -- needs -lrt

[Giles Malet]

On the cyrus-imapd-2.5 branch (currently 3a53853) from https://github.com/cyrusimap/cyrus-imapd, this commit:

865199d imapd.c: imapoptions: implement idle timeout

introduces the use of clock_gettime() in imap/imapd.c. That means it needs to be linked with -lrt, but that is not happening on my system.

# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.8 (Santiago)
# uname -a
Linux minos 2.6.32-642.6.2.el6.x86_64 #1 SMP Mon Oct 24 10:22:33 EDT
2016 x86_64 x86_64 x86_64 GNU/Linux

I use:

# autoreconf -i
# ./configure --prefix=/usr --libdir=/usr/lib64 --with-libcap --enable-sieve \
  --enable-idled --enable-murder \
  --enable-replication --with-service-path=/usr/lib/cyrus-imapd \
  --with-cyrus-prefix=/usr/lib/cyrus-imapd

and end up with this:

libtool: link: gcc -fPIC -g -O2 -o imap/.libs/imapd imap/imap_proxy.o imap/imapd.o imap/mutex_fake.o imap/pushstats.o imap/proxy.o master/service.o  sieve/.libs/libcyrus_sieve.so imap/.libs/libcyrus_imap.so -luuid /usr/local/mailchk/src/cyrus/cyrus-imapd/lib/.libs/libcyrus_min.so /usr/local/mailchk/src/cyrus/cyrus-imapd/lib/.libs/libcyrus.so -ljansson lib/.libs/libcyrus.so lib/.libs/libcyrus_min.so -lsasl2 -lssl -lcrypto -lwrap -lnsl -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lkrb5support -ldb-4.7 -lz -lcap
imap/imapd.o: In function `deadline_exceeded':
/usr/local/mailchk/src/cyrus/cyrus-imapd/imap/imapd.c:2874: undefined reference to `clock_gettime'
imap/imapd.o: In function `cmd_idle':
/usr/local/mailchk/src/cyrus/cyrus-imapd/imap/imapd.c:2905: undefined reference to `clock_gettime'
collect2: ld returned 1 exit status


Interestingly, lib/util.c contains this comment:

 * [...] Would be more
 * useful and sensible if it worked in system monotonic
 * time using clock_gettime(CLOCK_MONOTONIC) but that
 * would require linking with -lrt.

and it continues without clock_gettime().

Is this something missing in the configure scripts? I'm not familiar with them so don't know how to patch this.

If the author of libs/util.c avoided using -lrt, should imapd.c too? Or if imapd.c is introducing it, perhaps util.c could make use of it as well.

Anyone have any pointers?

Thanks,
g