[CMake] out of source shared source

[Timm Reichert]

Hi,

Is it possible to set an out of tree directory to include a
CMakeLists.txt file ?
I want to have a shared static code base for many projects like this:

source_tree/
source_tree/static_shared_source_for_projects/CMakeLists.txt
source_tree/static_shared_source_for_projects/...
source_tree/projects
source_tree/projects/project1/CMakeLists.txt
source_tree/projects/project1/...
source_tree/projects/project2/CMakeLists.txt
source_tree/projects/project2/...
source_tree/projects/project3/CMakeLists.txt
source_tree/projects/project3/...

I have solved this problem earlier with qmake by including a project
file.
I can not find this kind of include-mechanism because if I include the
shared source CMakeLists.txt file
with INCLUDE(...) the cmake variable CMAKE_CURRENT_SOURCE_DIR points to
the project location.
In qmake the macro $$PWD always points to the "current" directory.
The ADD_SUBDIRECTORY macro seems to work only with "in tree source"
relative to the top-level CMakeLists.txt.
I look for a kind of "ADD_DIRECTORY"!

tr
   
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