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Understanding CMake's Header Dependency Management
CMake initially treats header files outside of the project directory as external resources. This behavior can lead to dependency tracking issues in generated projects.
Solution: Designating Include Directories
To properly include headers, two steps are necessary:
Adding the Include Directory:
Use target_include_directories for recent CMake versions (e.g., 3.0 ):
target_include_directories(test PRIVATE ${YOUR_DIRECTORY})
For older CMake versions (e.g., 2.8.10 or before, without target_include_directories support):
include_directories(${YOUR_DIRECTORY})
Including Header Files in Target Source List:
To track dependencies, add header files to the source list for the target:
set(SOURCES file.cpp file2.cpp ${YOUR_DIRECTORY}/file1.h ${YOUR_DIRECTORY}/file2.h) add_executable(test ${SOURCES})
Example: Linking Headers to Multiple Targets
To share header files across multiple targets:
set(HEADER_FILES ${YOUR_DIRECTORY}/file1.h ${YOUR_DIRECTORY}/file2.h) add_library(mylib libsrc.cpp ${HEADER_FILES}) target_include_directories(mylib PRIVATE ${YOUR_DIRECTORY}) add_executable(myexec execfile.cpp ${HEADER_FILES}) target_include_directories(myexec PRIVATE ${YOUR_DIRECTORY})
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