[CMake] Creating relocatable packages

[Guillaume Dumont]

What you are seeing is the expected behavior. You can get a relocatable
package if all your dependencies (in your case libcap) have themselves
relocatable package config files with exported targets. Then you package
should make use of find_dependency macro.

On Fri, Oct 16, 2015 at 4:56 PM, Zac Bergquist <zbergquist99 at gmail.com>
wrote:

> I've created a sample project to replicate my issue in hopes that it would
> make it easier to troubleshoot.
>
> Thanks for any help,
> Zac
>
> https://github.com/zmb3/cmaketest
>
> On Mon, Oct 12, 2015 at 8:53 AM, Zac Bergquist <zbergquist99 at gmail.com>
> wrote:
>
>> Hello,
>>
>> I'm trying to fix a project so that its output is relocatable.  The
>> project is a library that itself depends on libpcap.  My goal is to be able
>> to import the library into my CMake application and have CMake
>> automatically link libpcap with it.
>>
>> I'm using a toolchain file that invokes an ARM cross compiler, sets
>> CMAKE_INSTALL_PREFIX and appends it to CMAKE_FIND_ROOT_PATH.  This all
>> seems to work well.
>>
>> What I'm seeing is that the exported files that get installed to
>> CMAKE_INSTALL_PREFIX contain absolute paths to libpcap on my machine, which
>> make them useless to other team members.
>>
>> The first thing I changed was to use CONFIGURE_PACKAGE_CONFIG_FILE
>> instead of CONFIGURE_FILE.  This got rid of absolute paths in the generated
>> CMake config file.
>>
>> However, I still have absolute paths in the CMake target import file that
>> gets generated.  The IMPORTED_LINK_INTERFACE_LIBRARIES target property has
>> an absolute path instead of one relative to CMAKE_INSTALL_PREFIX.
>>
>> I've read the "Creating Relocatable Packages" [1] section of the CMake
>> packages documentation. I'm pretty sure this is what I'm running into, but
>> I don't quite understand how to solve it.  The documentation says that I
>> should be using imported targets, but I'm not sure how to do so.  The
>> library is just using its own FindPCAP.cmake file to locate libpcap.
>>
>> Does anyone know of an example of a CMake package that imports other
>> libraries?  I could also try to create a minimal example project with this
>> setup if it would be helpful.
>>
>> Thanks,
>> Zac
>>
>> [1]:
>> https://cmake.org/cmake/help/v3.3/manual/cmake-packages.7.html#creating-relocatable-packages
>>
>>
>
> --
>
> Powered by www.kitware.com
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Kitware offers various services to support the CMake community. For more
> information on each offering, please visit:
>
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://public.kitware.com/mailman/listinfo/cmake
>



-- 
Guillaume Dumont
=========================
dumont.guillaume at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/cmake/attachments/20151017/9dbd759c/attachment-0001.html>