[SOLVED] Building sendmail 8.16.1 returns an undefined reference error

RandomTroll · 08-01-2020, 06:44 PM

When I build sendmail 8.16.1 I get:

Quote:

/usr/bin/ld: domain.o: in function `getmxrr':
domain.c: (.text+0x156): undefined reference to `__res_search'
/usr/bin/ld: domain.c: (.text+0x228): undefined reference to `__dn_skipname'
/usr/bin/ld: domain.c: (.text+0x368): undefined reference to `__res_query'
/usr/bin/ld: domain.c: (.text+0x526): undefined reference to `__dn_expand'

/usr/bin/ld: domain.o: in function `dns_getcanonname':
domain.c: (.text+0x112e): undefined reference to `__res_querydomain'
/usr/bin/ld: domain.c: (.text+0x1317): undefined reference to `__dn_skipname'
/usr/bin/ld: domain.c: (.text+0x1427): undefined reference to `__dn_expand'

/usr/bin/ld: sm_resolve.o: in function `dns_lookup_int':
sm_resolve.c: (.text+0x246): undefined reference to `__res_search'
/usr/bin/ld: sm_resolve.c: (.text+0x433): undefined reference to `__res_search'
/usr/bin/ld: sm_resolve.c: (.text+0x54a): undefined reference to `__dn_expand'

collect2: error: ld returned 1 exit status
make: *** [Makefile:445: sendmail] Error 1

I think this means that the source for domain.c doesn't find a reference to __res_search in any of the libraries to which it links. I can still build the previous version, 8.15.2 with no problem. Does this mean that sendmail doesn't link to libresolv correctly?

bathory · 08-02-2020, 01:26 AM

Quote:

When I build sendmail 8.16.1 I get:
/usr/bin/ld: domain.o: in function `getmxrr':
domain.c: (.text+0x156): undefined reference to `__res_search'
/usr/bin/ld: domain.c: (.text+0x228): undefined reference to `__dn_skipname'
/usr/bin/ld: domain.c: (.text+0x368): undefined reference to `__res_query'
/usr/bin/ld: domain.c: (.text+0x526): undefined reference to `__dn_expand'

/usr/bin/ld: domain.o: in function `dns_getcanonname':
domain.c: (.text+0x112e): undefined reference to `__res_querydomain'
/usr/bin/ld: domain.c: (.text+0x1317): undefined reference to `__dn_skipname'
/usr/bin/ld: domain.c: (.text+0x1427): undefined reference to `__dn_expand'

/usr/bin/ld: sm_resolve.o: in function `dns_lookup_int':
sm_resolve.c: (.text+0x246): undefined reference to `__res_search'
/usr/bin/ld: sm_resolve.c: (.text+0x433): undefined reference to `__res_search'
/usr/bin/ld: sm_resolve.c: (.text+0x54a): undefined reference to `__dn_expand'

collect2: error: ld returned 1 exit status
make: *** [Makefile:445: sendmail] Error 1
I think this means that the source for domain.c doesn't find a reference to __res_search in any of the libraries to which it links. I can still build the previous version, 8.15.2 with no problem. Does this mean that sendmail doesn't link to libresolv correctly?

Take a look here for an explanation and a solution

RandomTroll · 08-02-2020, 01:47 AM

Quote:

Originally Posted by bathory

Take a look here for an explanation and a solution

Thanks. My own search didn't turn this up. There's a previous thread with exactly this problem in LQ, on an earlier version of sendmail, unsolved https://www.linuxquestions.org/quest...re-4175549965/
I didn't have this problem in 8.15.1 - I wonder what changed.

I haven't built sendmail in a long time. I forgot the baroque structure.

PS: The right way to do this is by editing devtools/Site/site.config.m4, then build with

Code:

sh ./Build -c

scp · 08-17-2025, 04:42 PM

The link you posted with the solution (5 years ago) is unreachable. If someone could post the actual solution on this forum it would be very helpful

RandomTroll · 08-17-2025, 11:16 PM

Quote:

Originally Posted by scp

The link you posted with the solution (5 years ago) is unreachable. If someone could post the actual solution on this forum it would be very helpful

It's been 5 years: I've forgotten.

boughtonp · 08-18-2025, 06:55 AM

The link bathory posted in #2 is available in Wayback Machine: //web.archive.org/web/2020/http://www.jojees.com/resources/how-tos/sendmail/installation#TOC-Troubleshooting

I believe the referenced text from that page is:

Quote:

"domain.o: In function `dns_getcanonname'"
The above error is usually found when the sendmail compilation does not find the resolv.h header file. The text of the error is attached below. This file provides the routine known as res_query. So we have to force the sendmail installation to rather take the system resolver routine which may not be installed in the path /usr/include. To do so we just need to modify the variable "LIBS" in Makefile which is under the sendmail object directory. A pattern "-lresolv" has to be appended to the line containing "LIBS" variable.

scp · 08-18-2025, 04:01 PM

Thank you. Adding -lresolv to the LIBS variable in the makefile in the object/sendmail directory does work - but resolv.h is in the /usr/include directory which is referenced by confINCDIRS in my site.conf.m4 file. So it is a bit mystifying why the Build program was not able to locate it.

scp · 08-20-2025, 12:12 PM

In the end I did not have to use -lresolv either in the makefile or in site.config.m4. It may have been changing DSASL2 to DSASL=2 or using -DHASFLOCK=1 instead of DHASFLOCK (though the latter should not have made a difference) - or adding -ldb to conf_sendmail_LIBS. But this is what worked in the end with Berkley db correctly accessing flock:

dnl # SASL2 (smtp authentication)
APPENDDEF(`confENVDEF', `-DSASL=2 -DHASFLOCK=1')
APPENDDEF(`conf_sendmail_LIBS', `-lsasl2')
dnl # STARTTLS (smtp + tls/ssl)
APPENDDEF(`conf_sendmail_ENVDEF', `-DSTARTTLS')
APPENDDEF(`conf_ENVDEF', `-D_FFR_SMTP_SSL')
APPENDDEF(`conf_sendmail_LIBS', `-lssl -lcrypto -ldb -L/usr/lib64')
APPENDDEF(`confLIBDIRS', `-L/usr/lib64')
APPENDDEF(`confINCDIRS', `-I/usr/include')