CODEWITHSUNDEEP
c++qtcmake
Vorac
Vorac

Reputation: 9124

CMake: include external library headers

I have this snippet and it works fine:

find_package(Qt5 COMPONENTS Core REQUIRED)
target_link_libraries( myproj Qt5::Core )
target_include_directories( myproj PRIVATE ${Qt5Core_INCLUDE_DIRS} )

because I want to use Qwt. Now I run find_library( LIB_qwt qwt ) and get the path to the .so in a breeze. But how do I get the header path and add it to target_include_directories()?

Also do I really need to manually include Qt? If I don't (but I include Qwt files in an ugly way) the headers of Qwt break compilation by not discovering Qt.

This is my Qwt installation: libqwt-qt5-dev.

Upvotes: 1

Views: 1684

Answers (1)

Silvano Cerza
Silvano Cerza

Reputation: 970

You should be able to add ${LIB_qwt_INCLUDE_DIR} or ${QWT_INCLUDE_DIR} to target_include_directories after find_library( LIB_qwt qwt ). You must include Qt manually.

If that doesn't work you can search for the path yourself, you could use find_path like so:

find_path(QWT_INCLUDE_DIR qwt.h)
target_include_directories( myproj PRIVATE ${Qt5Core_INCLUDE_DIRS} ${QWT_INCLUDE_DIR})

qwt.h must be somewhere on the path obviously.

Upvotes: 2

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