我目前正在努力连接需要与GLFW3链接的C ++项目，即使用-lglfw3调用ld。事情是，这在以前工作，现在我不知道，为什么它不再存在。
sudo pkg-config --libs glfw3
-L/usr/local/lib -lglfw3
该库也存在于上述声明打印的特定位置。但是，ld说：
Linking CXX executable modeling_2014_framework
/usr/bin/ld: error: cannot find -lglfw3
CMakeFiles/modeling_2014_framework.dir/main.cpp.o:main.cpp:function init(): error: undefined reference to 'glfwInit'
...
collect2: error: ld returned 1 exit status
make[2]: *** [modeling_2014_framework] Error 1
make[1]: *** [CMakeFiles/modeling_2014_framework.dir/all] Error 2
make: *** [all] Error 2
我使用cmake创建makefile。这就是CMakeLists的样子：
cmake_minimum_required (VERSION 2.8)
set (project_name modeling_2014_framework)
# create project
project (${project_name})
# sources
set(SOURCES main.cpp)
# add headers to the project
file(GLOB MY_HEADERS "src/*.h")
list(APPEND HEADERS ${MY_HEADERS})
# add sources to the project
file(GLOB MY_SOURCES "src/*.cpp")
list(APPEND SOURCES ${MY_SOURCES})
# i also tried to manually set them here, which however also does not help
#set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} /usr/local/lib)
# OpenGL
find_package(OpenGL REQUIRED)
if (NOT OPENGL_FOUND)
message (FATAL_ERROR "OpenGL not found!")
return()
endif ()
# glew
if (UNIX)
set(GLEW_LIBRARY libGLEW.so)
else()
set (GLEW_INCLUDE_DIR "" CACHE PATH "glew include directory")
set (GLEW_LIBRARY_DIR "" CACHE PATH "glew build directory")
if (GLEW_INCLUDE_DIR STREQUAL "" AND GLEW_LIBRARY_DIR STREQUAL "")
return()
else()
find_library(GLEW_LIBRARY NAMES GLEW glew32 glew glew32s PATHS ${GLEW_LIBRARY_DIR})
endif()
endif(UNIX)
# glfw
set (GLFW_STATIC FALSE CACHE BOOL "link against static or dynamic glfw3 library")
if (WIN32)
set (GLFW_INCLUDE_DIR "" CACHE PATH "GLFW include directory")
set (GLFW_LIBRARY_DIR "" CACHE PATH "GLFW build directory")
if (GLFW_INCLUDE_DIR STREQUAL "" AND GLFW_LIBRARY_DIR STREQUAL "")
return()
else()
if (GLFW_STATIC)
find_library(GLFW_LIBS NAMES glfw3 PATHS ${GLFW_LIBRARY_DIR})
else(GLFW_STATIC)
find_library(GLFW_LIBS NAMES glfw3dll PATHS ${GLFW_LIBRARY_DIR})
endif(GLFW_STATIC)
endif()
else()
find_package(PkgConfig REQUIRED)
pkg_search_module(GLFW REQUIRED glfw3)
if (GLFW_STATIC)
set (GLFW_LIBS ${GLFW_STATIC_LIBRARIES})
else(GLFW_STATIC)
set (GLFW_LIBS ${GLFW_LIBRARIES})
endif(GLFW_STATIC)
list(APPEND GLFW_LIBS libXxf86vm.so)
list(APPEND GLFW_LIBS libGLU.so)
list(APPEND GLFW_LIBS libX11.so)
list(APPEND GLFW_LIBS libXrandr.so)
list(APPEND GLFW_LIBS libpthread.so)
list(APPEND GLFW_LIBS libXi.so)
endif()
include_directories(${GLEW_INCLUDE_DIR}
${GLFW_INCLUDE_DIR}
${OPENGL_INCLUDE_DIR}
)
# executable
add_executable(${project_name} ${SOURCES} ${HEADERS})
target_link_libraries(${project_name}
${OPENGL_LIBRARIES}
${GLEW_LIBRARY}
${EXTRA_LIBS}
${GLFW_LIBS}
)
如果我手动运行ld命令并添加-L / usr / local / lib，则链接器运行正常。所以我最重要的问题是，如何确保cmake将此路径添加到makefile中，以便ld运行正常。
提前致谢=）
Edit1：根据请求，带有详细日志的stdout：
myname@fxt ~/courses/Modellierung/proj/exercise1 $ make VERBOSE=1
/usr/bin/cmake -H/home/myname/courses/Modellierung/proj/exercise1 -B/home/myname/courses/Modellierung/proj/exercise1 --check-build-system CMakeFiles/Makefile.cmake 0
/usr/bin/cmake -E cmake_progress_start /home/myname/courses/Modellierung/proj/exercise1/CMakeFiles /home/myname/courses/Modellierung/proj/exercise1/CMakeFiles/progress.marks
make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/myname/courses/Modellierung/proj/exercise1'
make -f CMakeFiles/modeling_2014_framework.dir/build.make CMakeFiles/modeling_2014_framework.dir/depend
make[2]: Entering directory `/home/myname/courses/Modellierung/proj/exercise1'
cd /home/myname/courses/Modellierung/proj/exercise1 && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/myname/courses/Modellierung/proj/exercise1 /home/myname/courses/Modellierung/proj/exercise1 /home/myname/courses/Modellierung/proj/exercise1 /home/myname/courses/Modellierung/proj/exercise1 /home/myname/courses/Modellierung/proj/exercise1/CMakeFiles/modeling_2014_framework.dir/DependInfo.cmake --color=
make[2]: Leaving directory `/home/myname/courses/Modellierung/proj/exercise1'
make -f CMakeFiles/modeling_2014_framework.dir/build.make CMakeFiles/modeling_2014_framework.dir/build
make[2]: Entering directory `/home/myname/courses/Modellierung/proj/exercise1'
Linking CXX executable modeling_2014_framework
/usr/bin/cmake -E cmake_link_script CMakeFiles/modeling_2014_framework.dir/link.txt --verbose=1
/usr/bin/g++ -g3 -gdwarf-2 CMakeFiles/modeling_2014_framework.dir/main.cpp.o CMakeFiles/modeling_2014_framework.dir/src/VertexBufferObjectAttribs.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Vector3.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Shader.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Matrix4x4.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Scene.cpp.o CMakeFiles/modeling_2014_framework.dir/src/TgaLoader.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Vector4.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Vector2.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Renderer.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Matrix3x3.cpp.o CMakeFiles/modeling_2014_framework.dir/src/Common.cpp.o CMakeFiles/modeling_2014_framework.dir/src/SkyCube.cpp.o -o modeling_2014_framework -rdynamic -lGLU -lGL -lSM -lICE -lX11 -lXext -lGLEW -lglfw3 -lXxf86vm -lGLU -lX11 -lXrandr -lpthread -lXi
/usr/bin/ld: error: cannot find -lglfw3
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:49: error: undefined reference to 'glfwInit'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:53: error: undefined reference to 'glfwInit'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:60: error: undefined reference to 'glfwSetErrorCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:63: error: undefined reference to 'glfwWindowHint'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:64: error: undefined reference to 'glfwWindowHint'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:65: error: undefined reference to 'glfwWindowHint'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:66: error: undefined reference to 'glfwWindowHint'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:74: error: undefined reference to 'glfwCreateWindow'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:77: error: undefined reference to 'glfwSetKeyCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:78: error: undefined reference to 'glfwSetWindowSizeCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:79: error: undefined reference to 'glfwSetMouseButtonCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:80: error: undefined reference to 'glfwSetCursorPosCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:81: error: undefined reference to 'glfwSetScrollCallback'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:84: error: undefined reference to 'glfwMakeContextCurrent'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:164: error: undefined reference to 'glfwTerminate'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:170: error: undefined reference to 'glfwGetTime'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:171: error: undefined reference to 'glfwGetTime'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:189: error: undefined reference to 'glfwPollEvents'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:190: error: undefined reference to 'glfwSwapBuffers'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:192: error: undefined reference to 'glfwSetWindowTitle'
/home/myname/courses/Modellierung/proj/exercise1/main.cpp:186: error: undefined reference to 'glfwWindowShouldClose'
/home/myname/courses/Modellierung/proj/exercise1/src/Renderer.cpp:61: error: undefined reference to 'glfwGetTime'
/home/myname/courses/Modellierung/proj/exercise1/src/Renderer.cpp:64: error: undefined reference to 'glfwGetTime'
collect2: error: ld returned 1 exit status
make[2]: *** [modeling_2014_framework] Error 1
make[2]: Leaving directory `/home/myname/courses/Modellierung/proj/exercise1'
make[1]: *** [CMakeFiles/modeling_2014_framework.dir/all] Error 2
make[1]: Leaving directory `/home/myname/courses/Modellierung/proj/exercise1'
make: *** [all] Error 2
myname@fxt ~/courses/Modellierung/proj/exercise1 $
编辑/快速解决方案： 我认为这不是原始问题的真正答案，但至少我找到了解决方法。我添加了
SET( CMAKE_EXE_LINKER_FLAGS "-L/usr/local/lib")
到位于add_executable（...）
上方的CMakeLists.txt文件现在它可以工作，因为-L ...选项正确传递给链接器。但是，由于我已经硬编码了这条路径，因此可能无法在任何计算机上运行。
答案 0 :(得分：1)
似乎您缺少链接命令行中的库搜索目录。尝试类似的东西。
LINK_DIRECTORIES(${GLFW_LIBRARY_DIR})
成功找到GLFW库之后和add_executable
http://www.cmake.org/cmake/help/v2.8.12/cmake.html#command:link_directories