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In this snippet:

cmake_minimum_required(VERSION 3.0)
project(hello LANGUAGES C VERSION 0.0.1)
add_library(a INTERFACE)
target_include_directories(a INTERFACE /usr/local/include)
add_executable(b main.c)
target_link_libraries(b PUBLIC a)
get_target_property(dirs b INCLUDE_DIRECTORIES)
message(STATUS "dirs: ${dirs}")

CMake will print:

-- dirs: dirs-NOTFOUND

I want all include directories of a target, but apparently those added via target_link_libraries get ignored somehow. How can I obtain all include directories of a target?

rwols
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2 Answers2

2

The problem is that the information you are seeking is only available after the generation step. You can get those only with e.g. add_custom_target() calls, which run during compile time. Your get_target_property() and message() calls run during CMake configuration step.

Disclaimer: Taken with small modifications from the question linked below:

add_custom_command(
    b_lists ALL
    ${CMAKE_COMMAND} -E echo "b INCLUDE_DIRECTORIES: $<TARGET_PROPERTY:B,INCLUDE_DIRECTORIES>"
)

References

Florian
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target_link_libraries does not add any directory, it adds the specific library that you've included. Use make VERBOSE=1 to see the complete command. You might be able to get the library output directory by reading the build directory or the library output name.

trollkill
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