[mongo-cxx-driver][legacy-0.0-26compat-2.6.2] Undefined reference to mongo::Date_t util

[Matthieu Corbeau]

Hi all,

this is possibly a duplicate as I don't know what happened with my previous version, so sorry if it is.

So, since I move to the late stable mongo c++ driver release (legacy-0.0-26compat-2.6.2), I have undefined references to 'mongo::Date_t::[...]() const' :

 undefined reference to `mongo::Date_t::toString() const'

 undefined reference to `mongo::Date_t::toTimeT() const'

Does any body had this linking issue ? Cannot quite manage to solve it at the moment.. 

[Andrew Morrow]

Hi -

What driver version were you using previously where this worked? Also, can you provide additional information describing your platform, toolchain, driver build, etc? See this wiki link for details on what information to provide so we can best help you:

https://github.com/mongodb/mongo-cxx-driver/wiki/Download%20and%20Compile#how-to-ask-for-help

Thanks,

Andrew

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[Matthieu Corbeau]

Hi Andrew,

thanks, yeah sorry of course you need more info :

• branch: 26compat
• tag: legacy-0.0-26compat-2.6.2
• host: ubuntu 12.04 LTS
• c++ compiler: g++ (Ubuntu/Linaro 4.6.4-1ubuntu1~12.04) 4.6.4
• boost: 1.55.0
• scons invocation: sudo scons --prefix=/var/lib/backend --libpath=/var/lib/backend/lib --cpppath=/var/lib/backend/include --extrapath=/var/lib/backend --full --use-system-boost --sharedclient

There is no compilation error on the library as I said previously, I joined herewith the result of the configuration phase (scons.log).

So a little example (test_mongo_date.cc):

#include <mongo/bson/bson.h>

int main()

{

    mongo::Date_t date_l;

    date_l.toTimeT();

    return 0;

}

Compiled with:
g++ -I/var/lib/backend/include -L/var/lib/backend/lib -o test_mongo_date test_mongo_date.cc -lmongoclient -lboost_system

Results in a linking issue:

/tmp/ccjOTidh.o: In function `main':

test_mongo_date.cc:(.text+0x1c): undefined reference to `mongo::Date_t::toTimeT() const'

collect2: ld returned 1 exit status

Any clue from there ?

[Andrew Morrow]

Hi Matthieu -

Thanks for providing the additional info. The problem is that the Date_t type is not marked MONGO_CLIENT_API in the 26compat branch. When linking to a shared library version of mongoclient, only symbols tagged with MONGO_CLIENT_API are exported from the shared library. Since Date_t lacks such an annotation, the symbols are not externally visible, and your application can't link.

The easiest workaround would be to link to a static library version of the C++ driver if you must use these Date_t functions. Please note that if you chose to do this, you need to build your application with -DSTATIC_LIBMONGOCLIENT. Another possibility would be to avoid using Date_t.

On the legacy branch we have added the MONGO_CLIENT_API tag to Date_t and other functions in time_support.h as part of fixing https://jira.mongodb.org/browse/CXX-150 (see the pull request linked in the ticket).

We are very conservative about making changes to the 26compat branch since it is intended to be as close as possible to a 1:1 copy of the C++ driver as it would exist in the main mongodb 2.6 repository. If using the static library on 26compat is not an option for you though, do feel free to comment on CXX-150 and request that we backport the fix to the 26compat branch. As the change is simply to apply some missing annotations, it is a fairly safe backport.

This issue will be resolved in the upcoming stable legacy-1.0.0 release, which is currently slated for release later this summer.

Thanks,

Andrew

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[Matthieu Corbeau]

Han, ok thanks Andrew.

I have been looking at the pull request 42 and it effectively look like a very minor fix. Do you think I have any chance to see it accepted in a week or two or should I just start doing hacks in my integration process to handle the static library in case I am using 'mongo::Date_t::toTimeT() const' ?

Thanks for your quick reply !!

[Andrew Morrow]

I agree, I think its fine to backport. I've filed https://jira.mongodb.org/browse/CXX-268 and slated it to be fixed for the upcoming 26compat-2.6.3 release. That release is currently listed as going out tomorrow, but Monday is more likely.

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[Matthieu Corbeau]

Awesome ! Lets see if it is shipped with 26compat-2.6.3 then !

[Matthieu Corbeau]

Let me know if I can be of any help for the backport today ? Thanks

[Andrew Morrow]

Hi Matthieu -

The PR with the proposed backport is up: https://github.com/mongodb/mongo-cxx-driver/pull/116/files

The originating branch is here: https://github.com/acmorrow/mongo-cxx-driver/tree/CXX-268

If you could test it and let us know if it resolves your issue with the shared library build we would appreciate it. We are hoping to release 26compat-2.6.3 today.

Thanks,

Andrew

On Mon, Jul 7, 2014 at 4:03 AM, Matthieu Corbeau <matthieu...@gmail.com> wrote:

Let me know if I can be of any help for the backport today ? Thanks

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[Matthieu Corbeau]

Totally works for me ! Thank you very much !!!

[Andrew Morrow]

Hi Matthieu -

We just released legacy-0.0-26compat-2.6.3 which contains the fix.

Thanks,

Andrew

On Mon, Jul 7, 2014 at 10:05 AM, Matthieu Corbeau <matthieu...@gmail.com> wrote:

Totally works for me ! Thank you very much !!!

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