develop branch, and maybe 2.4, does not compile with boost 1.46

Richard Roberts reporter

@dkeyes Can you please try with the 'feature/boost-compatibility' branch and see if you still have any compile errors?

2014-02-13T01:10:15+00:00

Daniel K

Most of it seems to build, but I'm getting a linking error. I'm checking to make sure I'm not missing any important libraries on my system right now.

#!

Linking CXX executable testCholesky
../libgtsam.so.3.0.0: undefined reference to `clock_gettime'
collect2: ld returned 1 exit status
make[2]: *** [gtsam/base/testCholesky] Error 1
make[1]: *** [gtsam/base/CMakeFiles/testCholesky.dir/all] Error 2
make: *** [all] Error 2

2014-02-13T17:58:24+00:00

Richard Roberts reporter

Hmm, @dkeyes can you tell me what version of Ubuntu, and if you're using boost from the standard repositories? Anything unusual about your system?

2014-02-13T18:29:55+00:00

Daniel K

I'm using Ubuntu 12.04.4 LTS, Precise Pangolin. I'm using the standard boost libraries (libboost-all-dev). A quick google search suggests -lrt needs to be specified to gcc for posix timer libraries. Is that already included in the linker path for gtsam?

2014-02-13T19:03:01+00:00

Richard Roberts reporter

I'm checking that... we've sometimes used that but it would be nice to understand why it works on one system and not another :-) To avoid future problems...

2014-02-13T19:09:18+00:00

Richard Roberts reporter

@dkeyes are you using the shared or static boost libraries? Or just the default?

2014-02-13T19:11:14+00:00

Daniel K

I'm also enabling the matlab wrapper in cmake, but I can't think of anything else that's different.

2014-02-13T19:11:52+00:00

Daniel K

Just the default, whichever one that is.

2014-02-13T19:14:43+00:00

Richard Roberts reporter

Ok, yeah I don't think that would cause it since the link error is in testCholesky.

2014-02-13T19:14:46+00:00

Richard Roberts reporter

Ok, @dkeyes found it, it looks like the old boost timer library is header-only, thus when using it we need to manually link with -lrt. The new boost timer library uses a compiled library with then automatically pulls in -lrt as needed. With boost <= 1.48 only the old timer library is available so we use that. So for the case when we use the old boost timer library, we need to manually link with -lrt. I'll make that change now...