[CMake] find_package with static library that uses pkg-config not working

[Aurelien Richez]

Hi,


pkg_check_modules used by find_package should generate MYLIBPREFIX_CFLAGS and MYLIBPREFIX_STATIC_CFLAGS according to the documentation.

You can try HAMLIB_STATIC_LIBRARIES. However, the finders often use "PC_MYLIB" as prefix using pkg_check_modules. So may be PC_HAMLIB_STATIC_LIBRARIES will work (or you can check out your Findhamlib.cmake to find which prefix is used by pkg_check_modules). I don't know if it is a good idea to directly use package config defined variables in a cmake file so if you can edit your Findhamlib.cmake, may be you should set HAMLIB_STATIC_{LIBRARIES,CFLAGS,...} to their corresponding PC_HAMLIB_STATIC_{...} (I am no expert about this, so I don't really know which are the good practices to write a finder).

Hope this helps.

Aurélien

----- Mail original -----
> De: "Bill Somerville" <bill at classdesign.com>
> À: cmake at cmake.org
> Envoyé: Dimanche 30 Mars 2014 12:45:32
> Objet: [CMake] find_package with static library that uses pkg-config not	working
> 
> Hi,
> 
> I am using find_package to configure a library that uses pkg-config.
> When I configure and build a static only version of the library the link
> commands generated for my project are wrong.
> 
> The problem boils down to the fact that for static link of a library
> pkg-config needs to be called with the '--static' option to extract the
> correct compile switches and link libraries.
> 
> In my case the library libdl needs to be linked because the external
> library uses run time library loading. For example:
> 
> $ pkg-config --cflags --libs hamlib
> -pthread -I/home/bill/test-install/hamlib/include
> -L/home/bill/test-install/hamlib/lib -lhamlib
> 
> $ pkg-config --cflags --libs --static hamlib
> -pthread -I/home/bill/test-install/hamlib/include
> -L/home/bill/test-install/hamlib/lib -lhamlib -lm -ldl -lusb
> 
> So how do I get find_package to use the correct pkg-config invocation
> when there is no shared library version of the external library or if I
> want to force static linking of this external library?
> 
> TIA
> Bill Somerville.
> --
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