How Can I Effectively Manage Header Directories in My CMake Projects?

Including Header Directories Effectively in CMake

To properly signal CMake that a directory contains headers to be included and tracked, follow these steps:

1. Include the Directory

target_include_directories(test PRIVATE ${YOUR_DIRECTORY})

For older CMake versions (2.8.10 or below):

include_directories(${YOUR_DIRECTORY})

2. Add Header Files to Source List

Include the header files as dependencies in the current target:

set(SOURCES file.cpp file2.cpp ${YOUR_DIRECTORY}/file1.h ${YOUR_DIRECTORY}/file2.h)
add_executable(test ${SOURCES})

This ensures that the header files are listed as dependencies in the Makefile and other generated project files.

Including Headers for Multiple Targets

If you need to include the same headers in 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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