On 19. Oct, 2010, at 9:22 , Maik Beckmann wrote:
> This is not a question but a finding during a debugging session I like to
> share and a documentation enhancement request.
>
> We have a number of projects that reside in different repositories including
> library projects that are chained up by find_package in conjunction with
> -config.cmake files that each library projects installs. So far we just had
> this rule:
> The N project builds are independent from each other. All they share is a
> common CMAKE_INSTALL_PREFIX
>
> This strategy has proven to reliable and even noob proof.
>
> Now we started installing our packages on the system and keep working on the
> development version independent from these installation. Which caused some
> trouble...
>
> If Proj-libFoo is installed to /usr, Proj-libBar depends on it and is
> configured with
> -DCMAKE_INSTALL_PREFIX=$HOME/projects/install
> it will pick the one in /usr.
> It took me some time to figure where CMAKE_INSTALL_PREFIX is injected into
> the list of prefixes to consider by find_package: CMAKE_SYSTEM_PREFIX_PATH in
> cmFindPackageCommand.cxx
> this->AddCMakePath("CMAKE_SYSTEM_PREFIX_PATH")
> CMAKE_SYSTEM_PREFIX_PATH holds a list of prefixes (/usr/local, /usr,...)
> where CMAKE_INSTALL_PREFIX is the last entry.
>
> That's the reason why our "just point the project to the others by using
> CMAKE_INSTALL_PREFIX" rule fell apart.
>
> The fix is easy: just set CMAKE_PREFIX_PATH to the same location that
> CMAKE_INSTALL_PRFIX is set to.
>
>
> Guys, please add the role that CMAKE_INSTALL_PREFIX plays for find_package to
> the docs.
>
>
> Thanks,
> MaikWhile I agree that it should be added to the documentation of find_package, it is what most people would expect (except when they get bitten by it). Most people would be pretty stumped if CMake wouldn't search in the installation prefix. My 2 cents... Michael -- There is always a well-known solution to every human problem -- neat, plausible, and wrong. H. L. Mencken
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