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POLinking is not working properly
 

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    <pre><code>project (2dplatformer) cmake_minimum_required (VERSION 2.8) set(CMAKE_MODULE_PATH ${sfmle_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH}) find_package(SFML 2.0 REQUIRED audio graphics network system window) include_directories (${SFML_INCLUDE_DIR}) link_libraries (${SFML_LIBRARIES}) add_library (Tilemap.o src/Tilemap.cpp) add_library (State.o src/State.cpp) add_library (TitleState.o src/TitleState.cpp) add_library (PlayState.o src/PlayState.cpp) add_library (Player.o src/Player.cpp) add_executable (2dplatformer src/Game.cpp) target_link_libraries (2dplatformer sfml-audio sfml-system sfml-graphics sfml-window Player.o PlayState.o Tilemap.o State.o TitleState.o) </code></pre> <p>That is my CMakeLists.txt, which I'm using to build my project.</p> <pre><code>[ 16%] Built target TitleState.o [ 33%] Built target Tilemap.o [ 50%] Built target Player.o [ 66%] Built target PlayState.o [ 83%] Built target State.o Linking CXX executable 2dplatformer libPlayState.o.a(PlayState.cpp.o): In function `PlayState::PlayState(Game*)': PlayState.cpp:(.text+0x286): undefined reference to `Player::Player(Game*, Tilemap*)' libPlayState.o.a(PlayState.cpp.o): In function `PlayState::update()': PlayState.cpp:(.text+0x378): undefined reference to `Player::update()' libPlayState.o.a(PlayState.cpp.o): In function `PlayState::draw()': PlayState.cpp:(.text+0x44f): undefined reference to `Player::draw()' collect2: error: ld returned 1 exit status make[2]: *** [2dplatformer] Error 1 make[1]: *** [CMakeFiles/2dplatformer.dir/all] Error 2 make: *** [all] Error 2 </code></pre> <p>My game works just fine when I use this very badly written Makefile:</p> <pre><code>LIBS=-lsfml-graphics -lsfml-window -lsfml-system all: @echo "*** Building the game" g++ -c "src/Tilemap.cpp" -o "build/Tilemap.o" g++ -c "src/State.cpp" -o "build/State.o" g++ -c "src/TitleState.cpp" -o "build/TitleState.o" g++ -c "src/PlayState.cpp" -o "build/PlayState.o" g++ -c "src/Game.cpp" -o "build/Game.o" g++ -c "src/Player.cpp" -o "build/Player.o" g++ -o 2dplatformer build/Tilemap.o build/Game.o build/State.o build/Player.o build/TitleState.o build/PlayState.o $(LIBS) map_editor: @echo "*** Building the level editor" g++ -c "src/Tilemap.cpp" -o "build/Tilemap.o" g++ -c "src/Editor.cpp" -o "build/Editor.o" g++ -o editor build/Tilemap.o build/Editor.o $(LIBS) clean: @echo "*** Removing object files and executable..." rm -rf build/* rm -f 2dplatformer </code></pre> <p>I am linking the libraries, so I can't tell why it can't find them.</p>
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    1. USDavid Gomes
    1. USDavid Gomes
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      1. VTUpMod
    1. COMaybe `cmake` doesn't put the library linker flags to the end of the invocation (they **must** be at the end if you're using a recent GNU toolchain).
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