[CMake] in- and out-of-source tree builds

[Orion Poplawski]

Various projects using cmake state that they don't support in source 
tree builds.  Is this a general case for cmake projects?

We're working on packaging guidelines for cmake projects in Fedora. 
Draft is here: http://fedoraproject.org/wiki/PackagingDrafts/cmake. 
Currently this does an in source tree build.

I currently do:

mkdir fedora
pushd fedora
cmake ..

In which the build directory is a subdirectory of the source tree.  I've 
also seen recommendations for a parallel directory, e.g.:

cmake ../source

Is this preferred over the former?

What are the issues that arise?  In general with RPM packaging you are 
starting with a clean freshly unpacked source tree.

Thanks!

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion at cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com