[CMake] Find packages coming from homebrew

[Roger Leigh]

On 23/11/16 14:55, Cedric Doucet wrote:
>
> Hello,
>
> I would like to write some FindFoo.cmake files to find packages
> installed on different systems including Mac.
> I have noticed that homebrew install packages in a repertory whose name
> depends on the version of the package.
> For example, I have installed a scientific library called scotch, and it
> is now installed here:
>
> /usr/local/Cellar/scotch/6.0.4_4

You should never need to use the Cellar directories directly.  It should 
also be linked under /usr/local/opt/scotch *and* linked directly into 
/usr/local.

When writing a FindFoo.cmake file, you shouldn't need to do anything 
special to handle this.  Just find the headers and libraries as usual.

If it's linked into /usr/local (brew link scotch) then it should be 
picked up without any special action

If it's not linked into /usr/local then the user should be able to add 
/usr/local/opt/scotch (or /usr/local/Cellar/scotch/nnnn) to 
CMAKE_PREFIX_PATH and it should then be picked up, again with no special 
casing in your FindFoo script


Regards,
Roger