Ettercap tests failure with Bsymbolic-functions

[LocutusOfBorg]

step to reproduce:

export CFLAGS="-Wl,-Bsymbolic-functions"
cmake .. -DENABLE_TESTS=ON
VERBOSE=1 make
make test

Failure!

this is a big problem, because debian automatically adds this flag (with no problem), while the same code on ubuntu just fails to build from source because of the test failure.
Please see:
https://buildd.debian.org/status/package.php?p=ettercap
https://buildd.debian.org/status/fetch.php?pkg=ettercap&arch=i386&ver=1%3A0.8.0-13&stamp=1399025000 (success)
https://launchpad.net/ubuntu/+source/ettercap/1:0.8.0-13
https://launchpadlibrarian.net/174435528/buildlog_ubuntu-utopic-i386.ettercap_1%3A0.8.0-13_FAILEDTOBUILD.txt.gz (same build, same arch, failure)

thoughts?
@barak do you have any clue?

[barak]

No idea. Also fails to build on Ubuntu amd64.
I guess the options are:

• track down dependencies and their versions to look for clues
• build manually in given environment so the error can be examined in detail
• wait for the Ubuntu people to figure it out

[LocutusOfBorg]

build manually in given environment so the error can be examined in detail

I have an ubuntu here, and tracking down resulted in this "-Wl,-Bsymbolic-functions" flag.

Building libettercap.so with this flag makes the "make test" fail.
also manually running ./test_ec_decode fails

[LocutusOfBorg]

(freely quoting irc since the conversation is public logged)
Reporting an irc conversation:
-So, building without symbolic-functions works?
-Does ettercap do something strange like define empty functions providing the decoders and expect them to be overridden with the symbols from the main executable?
-Huh. Where do those decoders get added?
-I'd guess that passing --dynamic-list-data would get you a “working” test there.
-'cause you appear to be relying on the fact that something is going to call add_decoder(decode_data) and resolve decode_data to your function pointer declared in the test, rather than in the library?
-Debian doesn't pass -Bsymbolic-functions to ld by default?
-I don't think Debian do automatically add -Bsymbolic-functions; it's not in the buildlog you linked, and it's not in LDFLAGS from dpkg-buildflags in Sid.
-You can either remove -Bsymbolic-functions from LDFLAGS, or you could add --dynamic-list-something-or-other to LDFLAGS.
-Frankly, I'd modify your test to test something more useful instead :)
-Check that add_decoder() works, check that get_decoder(...all those standard decoders...) returns non-null.
-Basically, remove the decode_* declarations at the top of the test file, and replace the checks with == NULL.
-(If I understand what's happening correctly, obviously ☺)