[CMake] funny cmake warnings about conflicting library folders

[Nico Schlömer]

I'm working around this now by making Foobar_LIBRARY_DIRS absolute,

get_filename_component(Foobar_LIBRARY_DIRS_ABS ${Foobar_LIBRARY_DIRS} REALPATH)

The hint to CMakePackageConfigHelpers certainly contain the proper bug
fix, so I forwarded this to the Foobar devs.

Thanks!
--Nico



On Mon, Sep 3, 2012 at 10:01 AM, Markus Blatt <markus at dr-blatt.de> wrote:
> On Mon, Sep 03, 2012 at 12:54:09AM +0200, Nico Schlömer wrote:
>> In an attempt to make Foobar relocatable, the library and header
>> directories are specified in
>> /usr/share/cmake/Foobar/FoobarConfig.cmake as
>>
>> SET(Foobar_INCLUDE_DIRS "${CMAKE_CURRENT_LIST_DIR}/../../../include/foobar")
>> SET(Foobar_LIBRARY_DIRS "${CMAKE_CURRENT_LIST_DIR}/../../../lib")
>>
>> All of this seems correct.
>> When running CMake on a project with FIND_PACKAGE(Foobar), the user is
>> swamped with warnings of the kind
>>
>> ==================== *snip* ====================
>> CMake Warning at test/CMakeLists.txt:81 (ADD_EXECUTABLE):
>>   Cannot generate a safe runtime search path for target operatorTest because
>>   files in some directories may conflict with libraries in implicit
>>   directories:
>>
>>     runtime library [libblas.so.3] in /usr/lib may be hidden by files in:
>>       /usr/share/cmake/Foobar/../../../lib
>>
>>   Some of these libraries may not be found correctly.
>> ==================== *snap* ====================
>>
>> When I edit /usr/share/cmake/Foobar/FoobarConfig.cmake to read
>>
>> SET(Foobar_LIBRARY_DIRS "/usr/lib"),
>>
>> those warnings disappear.
>
> I think CMake relies on absolute pathes. You might want to do
> something like this :
>
> get_filename_component(_dir "${CMAKE_CURRENT_LIST_FILE}" PATH)
> get_filename_component(_prefix "${_dir}/../../.." ABSOLUTE)
>  SET(Foobar_INCLUDE_DIRS "${_prefix}/include/foobar")
>  SET(Foobar_LIBRARY_DIRS "${_prefix}/lib")
>
>
> In newer versions there are also some macros/functions in
> CMakePackageConfigHelpers that help
> producing portable package configuration files.
>
> Cheers,
>
> Markus
>
> --
> Dr. Markus Blatt - HPC-Simulation-Software & Services http://www.dr-blatt.de
> Hans-Bunte-Str. 8-10, 69123 Heidelberg, Germany,  USt-Id: DE279960836
> --
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