[CMake] Undefined reference

[Mauricio Klein]

The error reported occurs in the launch time: the daemon doesn't starts and
report (in terminal) a GLIBC version error. I mean, the daemon was compiled
in a old CentOS (4.8) and i'm trying to run in the latest Ubuntu.

But anyway, i will make more tests as you sugested and try to discovery
what exactly is happening.

Once again, thank you so much for your help!

On Thu, Nov 3, 2011 at 3:09 PM, Michael Hertling <mhertling at online.de>wrote:

> On 11/03/2011 03:51 PM, Mauricio Klein wrote:
> > Thank you Raphael, it worked!
> >
> > One last question: i've tried to compile my code using static linkage,
> once
> > i need my daemon runs in many Linux releases. But, even static, in many
> > systems my code crashes because the GLIBC version.
>
> How do these crashes manifest themselves, e.g. shell/syslog messages,
> return values, core dumps etc.? Are you sure they are related to the
> GLIBC version? Does the executable actually have no single dependency
> on any shared library, i.e. is it linked statically in its entirety?
> What does ldd or readelf report?
>
> > My question is: asking for static linkage in CMake can solve this
> problem?
>
> If even a statically linked executable crashes on the target system,
> telling CMake to link statically will hardly solve this problem. ;)
>
> > Or maybe another approach in CMake, where i embed all the needed
> > libraries...
>
> You might take a look the the BundleUtilities Module, but at first,
> I'd recommend to investigate what exactly causes the crashes. Your
> best bet is probably to provide a tiny but self-contained example
> that works on your development platform and crashes on a target
> system, along with some information about the latter's setup.
>
> Regards,
>
> Michael
>
> > On Thu, Nov 3, 2011 at 12:19 PM, Raphael Kubo da Costa
> > <rakuco at freebsd.org>wrote:
> >
> >> Mauricio Klein
> >> <mauricio.klein.msk at gmail.com> writes:
> >>
> >>> I can compile all my codes without problems, but in the linkage step, i
> >>> receive a lot of errors about undefined reference to OpenSSL functions
> >>> (yes, my code uses OpenSSL).
> >>>
> >>> In my own (and ugly :P) Makefile, i use "-lssl" flag in g++ compile
> line.
> >>>
> >>> My question is: how can i pass this flag in CMake.
> >>> Also, i'm not sure if i'm using CMake correctly. Is correctly use
> "-lssl"
> >>> flag in CMake or i need to copy the library to a folder inside my
> project
> >>> and link to this copy?
> >>
> >> You need to find OpenSSL with `find_package(OpenSSL)' and then, assuming
> >> it is found (ie. OPENSSL_FOUND is true), link to its libraries with
> >> `target_link_libraries(YOUR_APP ${OPENSSL_LIBRARIES})'.
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-- 
Best regards,

Maurício Souza Klein.
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