[CMake] should zlib be searched in CMAKE_PREFIX_PATH or am I confused?

[Mario Emmenlauer]

Dear Stephen,

thanks for your great help, I certainly learned something! But for
my current problem, zlib generally uses autotools to build, and the
find_package(ZLIB) is in my case looking for the library, not the
cmake config. Would your idea of CMAKE_MODULE_PATH apply to that?

All the best,

   Mario


On 21.03.2018 20:12, Stephen McDowell wrote:
> Hi Mario,
> 
> Do you get different results if you set CMAKE_MODULE_PATH rather than CMAKE_PREFIX_PATH?  I wrote a tutorial for how to install a library called librealsense,
> at the very bottom is what will interest you:
> 
> https://gist.github.com/svenevs/f00ed3898d2af6248921b63254aa8cc1#enable-librealsense-for-other-cmake-projects
> 
> # Allow for `find_package(realsense2)` in CMake projects
> export CMAKE_MODULE_PATH="/opt/librealsense/lib/cmake${CMAKE_MODULE_PATH:+:${CMAKE_MODULE_PATH}}"
> 
> 
> This environment variable can either be set, or specified like you are doing with cmake .. -DCMAKE_MODULE_PATH=“/data/thirdparty”, *noting* that depending on
> where it got installed you may also need an extra *lib* on that path
> 
>     /data/thirdparty/*lib*
> *
> *
> I’m sure others on this list know the “right” practice, but when CMAKE_INSTALL_PREFIX=/usr/local, it’s very common to see two possible install locations:
> 
>     /usr/local/cmake
>     /usr/local/lib/cmake
> 
> AKA just make sure that the zlib folder is a child directory.  In the librealsense2 example, I have
> 
>     $ ls /opt/librealsense2/lib/cmake/
>     realsense2/
> 
> So since /opt/librealsense2/lib/cmake is in my CMAKE_MODULE_PATH, when I do find_package(realsense2), it will find that directory.
> 
> I don’t know exactly what Zlib’s install looks like, and I know it matters whether they are using “new” or “old” cmake installation tactics, but hopefully this
> gets you closer to solving it!
> 
> -Stephen
> 
> 
> 



Viele Gruesse,

    Mario Emmenlauer


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