How to add “out-of-tree” common source file

Question

Marte Myrvold · Accepted Answer

Hi Cedric, 
 You can have the files in a common directory and add them to each project's CMakeLists.txt. Add the source files with target_sources() and the directory (or directories) of the header files' location(s) with target_include_directories(). If you have a few files, you can add the paths directly in target_sources() and target_include_directories(), but if you have several files, you can set a COMMON_ROOT variable. 
 For example, if this is your directory structure: 
 Mesh |___ Light |___ src |___ main.c |___ prj.conf |___ CMakeLists.txt |___ Switch |___ src |___ main.c |___ prj.conf |___ CMakeLists.txt |___ Sensor |___ src |___ main.c |___ prj.conf |___ CMakeLists.txt |___ Common |___ src |___ adc.c |___ include |___ adc.h 
 Then you can do the following in CMakeLists.txt: 
 set(COMMON_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../common)

target_sources(app PRIVATE
 src/main.c
 ${COMMON_ROOT}/include/adc.c
)

target_include_directories(app PRIVATE
 ${COMMON_ROOT}/include
)
 
 With this, you can include adc.h in any of the projects. 
 Best regards, Marte

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How to add “out-of-tree” common source file

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