Move duplicated CmakeLists.txt functionality to a common file

Question

I have multiple projects that have identical/duplicated code in their respective CMakeLists.txt. At the very least I need a place to store string definitions that I can pull into the CMakeLists.txt files. What's the best way to do this? My directory structure

common_defs/
        src_files
        hdr_files
        CMakeLists.Txt  - file that has common defs
independent_dir1/
        src_files
        hdr_files
        CMakeLists.Txt  --> Imports/Includes from ../common_defs/CMakeLists.txt
independent_dir2/
        src_files
        hdr_files
        CMakeLists.Txt  --> Imports/Includes from ../common_defs/CMakeLists.txt

independent_dir1 and independent_dir2 will be built independently from each other. Building in common_defs should not trigger builds in the independent_dirs

add_subdirectory doesn't quite get me there, because I need independent builds. — m_deployment
– m_deployment, Commented Jun 21, 2018 at 13:20
use include to include common cmake code. But honestly, i think we dont entirely understand your problem. What do you mean with pull? — kuga
– kuga, Commented Jun 21, 2018 at 13:24
include will do it. WRT "pull" I'm not sure what to call it, I can see why it's confusing. I mean that the independent_dir*/CMakeLists files should include/import the common code from the common_defs/CMakeLists.txt file — m_deployment
– m_deployment, Commented Jun 21, 2018 at 13:28

KamilCuk · Accepted Answer · 2018-06-21 13:28:04Z

1

Create a file in common_defs/common_defs.cmake with common strings and definitions, than add to your CMakeLists.txt:

// add path common_defs to include search path
list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/../common_defs")
// include module from file common.cmake searched in search path
include(common_defs)

answered Jun 21, 2018 at 13:28

KamilCuk

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1 Comment

m_deployment Over a year ago

Thanks I'll give this a shot now, and mark the answer appropriately.

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