[CMake] avoiding finding system libraries (motivation is superbuilds)

[Robert Maynard]

Have you tried using CMAKE_PREFIX_PATH instead of CMAKE_INSTALL_PREFIX?

On Thu, May 4, 2017 at 5:13 PM, Kris Thielemans <kris.f.thielemans at gmail.com
> wrote:

> Hi
>
>
>
> Short question: if we have a library/include files installed both in the
> usual system locations and outside, how do we force CMake to find the
> latter? (without modifying the CMake files of the project).
>
>
>
> Motivation:
>
> We’re trying to make a SuperBuild that builds/downloads a specific version
> of various packages (such as Boost and GTest). Our motivation is to have
> complete control of the version. We don’t want to install this in standard
> locations to avoid clashes, root permissions etc.  So let’s say we install
> our versions in ~/our_stuff/lib, ~/our_stuff/include etc
>
>
>
> It seems very hard (and sometimes impossible) however to let future
> find_packages find our own versions as opposed to the system ones. From
> https://cmake.org/cmake/help/latest/command/find_library.html I thought
> that doing something like this would work
>
>
>
> cmake ../ -DCMAKE_INSTALL_PREFIX=~/our_stuff
>
>
>
> but the system version of boost etc are still found first (it does work if
> there is no system version of the library). In the case of Boost, even
>
>
>
> cmake ../ -DCMAKE_INSTALL_PREFIX=~/our_stuff -DBOOST_ROOT=~/our_stuff
>
>
>
> doesn’t help (tested on Linux). I have to set BOOST_INCLUDEDIR for
> instance. As every Find*.cmake has its own conventions of specifying
> cmake/environment variables, and some don’t at all, this just gets
> unfeasible.
>
>
>
> I know about NO_DEFAULT_PATH, NO_CMAKE_SYSTEM_PATH etc options for
> find_package, but this would need modification of CMake files in the
> dependent packages which is quite undesirable for us.
>
>
>
> Any suggestions?
>
>
>
> Thanks
>
> Kris
>
>
>
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