Building tests fails with "undefined reference to `fLI::FLAGS_v'"

[Steffen Gauglitz]

Hello all,

On my machine, building Ceres (with shared libs -DBUILD_SHARED_LIBS=ON, and including the tests, per default) fails with
 ../../lib/libtest_util.so: undefined reference to `fLI::FLAGS_v'
...and I'm hoping somebody could point me in the right direction of what might be wrong.

(The build succeeds when excluding the tests (cmake with -DBUILD_TESTING=OFF), though then I'm seeing (presumably related) linker issues when using Ceres later.)

Searching for the error gives me a few hits on other projects (not related to Ceres), but also using glog (e.g.: https://code.google.com/p/server1/issues/detail?id=1 -- the solution suggested there doesn't do the trick for me however).

This is a fresh git clone (head I6f1e42b419), Ubuntu 14.04, c++/g++ (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4; glog and gflags installed via apt-get install cmake libgoogle-glog-dev (as suggested at http://ceres-solver.org/building.html#dependencies). dpkg -s libgoogle-glog-dev shows version 0.3.3-1; dpkg -s libgflags-dev shows version 2.0-1.1ubuntu1.

Any hints appreciated.

Thanks much!
 Steffen

[Steffen Gauglitz]

Addendum: this happens both with the current head on master as well as the 1.10.0 release (after fixing the latter with the patch from https://ceres-solver.googlesource.com/ceres-solver/+/378b5752177427f5b8a2807422ba77c50a164f93%5E!/#F0 as described here: https://groups.google.com/forum/#!topic/ceres-solver/58m1efsZZCc), and also when building the lib statically (without the -DBUILD_SHARED_LIBS=ON)...

...any ideas?

[Andreu Corominas Murtra]

Hi Steffen,

just try to follow that 5 step recipe (we work with the same ingredients and works for us):

    https://wiki.iri.upc.edu/index.php/Wolf#Ceres_.285_steps.29

hope it helps,

andreu



 

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-- 
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   Andreu Corominas Murtra
   PhD Engineer
   Mobile Robotics & Artificial Perception
   www.beta-robots.com
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[Alex Stewart]

Steffen,

I can’t replicate this on my 14.04.2 build machine (a slightly earlier version to yours based on the GCC version: Ubuntu 4.8.2-19ubuntu1), which also uses the libgoogle-glog-dev (0.3.3-1) & libgflags-dev (2.0-1.1ubuntu1) packages.

Do you have multiple versions of glog (or gflags) installed on your machine?  Specifically a version installed in /usr/local?  If you run the CMake ncurses GUI (ccmake) and <t> to see the advanced view after configuring, what are the values of:

GFLAGS_INCLUDE_DIR

GFLAGS_LIBRARY

GLOG_INCLUDE_DIR

GLOG_LIBRARY

?  If you are using the system versions these should point to /usr/include & /usr/lib/x86_64-linux-gnu/XXX respectively.  My suspicion would be that Ceres is detecting a different install of glog.

-Alex

[Steffen Gauglitz]

Alex,

Many thanks for your reply! I think Ceres detecting a different install may have been the issue (?). Can't say for sure (I had already uninstalled glog & gflags in order to try building them from source instead when I got your message), but eventually removing them (verified by Ceres not finding them any more) and re-installing them (via apt-get) and rebuilding Ceres appears to have fixed it! Thanks again.

Andreu, many thanks for your help too -- however it seems that the link you sent leads to a password-protected internal site?

Thanks!
 Steffen

[Andreu Corominas Murtra]

Hi Steffen,

I'm not logged in ... try at http://wiki.iri.upc.edu/index.php/Wolf , and then move up to the section "Ceres (5 steps)"

let me know ...

andreu

To view this discussion on the web visit https://groups.google.com/d/msgid/ceres-solver/059f8753-ba17-412c-a7e5-0265be0a1dd2%40googlegroups.com.

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[Steffen Gauglitz]

Andreu,

Yes that link works (seems like the 'https' redirects it to a login page) -- thanks! Will keep in mind should any problems arise again.

-Steffen