[CMake] Problem with creating shared library

Damir Porobic Wed, 15 Aug 2018 01:32:56 -0700

Hi Folks,


I'm trying to write a shared library and run into an issue where I can't find 
any clues to where the problem is.

I have a project with following structure:


src/

    dir1/

        file1.h

        file1.cpp

    dir2/

        file2.h

        file2.cpp



Now I have this CMakeList:

cmake_minimum_required(VERSION 3.5)

project(kImageAnnotator VERSION 0.0.1 LANGUAGES CXX)


...


add_library(${PROJECT_NAME} SHARED ${kimageannotator_SRCS})
target_link_libraries(${PROJECT_NAME} Qt5::Widgets KF5::CoreAddons KF5::I18n 
KF5::WidgetsAddons)

target_include_directories(${PROJECT_NAME} PUBLIC 
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}> $<INSTALL_INTERFACE:include>)

set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${PROJECT_VERSION} 
SOVERSION 1)

set(kimageannotator_CONFIG ${PROJECT_NAME}Config)

install(TARGETS ${PROJECT_NAME} EXPORT ${kimageannotator_CONFIG}
        ARCHIVE  DESTINATION ${CMAKE_INSTALL_LIBDIR}
        LIBRARY  DESTINATION ${CMAKE_INSTALL_LIBDIR}
        RUNTIME  DESTINATION ${CMAKE_INSTALL_BINDIR})
install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} DESTINATION 
${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME})

install(EXPORT ${kimageannotator_CONFIG} DESTINATION 
share/${kimageannotator_CONFIG}/cmake)

export(TARGETS ${PROJECT_NAME} FILE ${kimageannotator_CONFIG}.cmake)


In another test project, I add the library like this:
...
find_package(kImageAnnotator REQUIRED)

add_executable(testApp main.cpp)
target_link_libraries(testApp Qt5::Widgets kImageAnnotator)


Now when I try to build my test project, I get this:

dporobic@linux ~/projects/testApp/build
$ cmake .. && make
-- Could not set up the appstream test. appstreamcli is missing.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/dporobic/projects/testApp/build
[ 25%] Automatic moc for target testApp
[ 25%] Built target testApp_automoc
Scanning dependencies of target testApp
[ 50%] Building CXX object CMakeFiles/testApp.dir/main.cpp.o
[ 75%] Building CXX object CMakeFiles/testApp.dir/testApp_automoc.cpp.o
[100%] Linking CXX executable testApp
CMakeFiles/testApp.dir/main.cpp.o: In function `main':
main.cpp:(.text+0x8e): undefined reference to 
`KImageAnnotator::KImageAnnotator(QPixmap const&)'
collect2: error: ld returned 1 exit status
CMakeFiles/testApp.dir/build.make:120: recipe for target 'testApp' failed
make[2]: *** [testApp] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/testApp.dir/all' failed
make[1]: *** [CMakeFiles/testApp.dir/all] Error 2
Makefile:94: recipe for target 'all' failed
make: *** [all] Error 2

Any idea how I could/should troubleshoot such issue?

Thanks in advance!

Regards,
Damir

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[CMake] Problem with creating shared library

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