If you set CMAKE_INSTALL_PREFIX, have the dependencies installed there, but
the source of them lying around in the parent directory of the build
directory, then the build will fail starting with opm-models because
we assume that ../opm-material is a build directory and set opm-material_DIR
to it. CMake will complain about not finding opm-material-config.cmake or
Opm-materialConfig.cmake. With this commit we will only set opm-material_DIR
if the directory contains a file CMakeCache.txt (which should be the case in
a configured build directory.
Directory outline of the failing situation is
- ${CMAKE_INSTALL_PREFIX} # where all dependencies are installed
- parent_dir
|____ opm-common #source dir
|____ opm-material #source dir
|____ ...
|____ build #build directory for current module (e.g. opm-modules)
Change is tested with sibling build
- build
|___ opm-common #build dir
|___ opm-material #build dir
|___ ...
and the dune version of it
- parent_dir
|___ opm-common # source dir
|____ build # build dir opm-common
|___ opm-material # source dir
|____ build # build dir opm-material
...
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