如何使用 cmake 静态共享库

Question

我是 CMake 的初学者，我想用它来编译我的项目。我有以下 CMakeLists.txt:

cmake_minimum_required (VERSION 2.6)
project (rt)

include_directories ("${PROJECT_BINARY_DIR}/src/")
include_directories ("${PROJECT_BINARY_DIR}/src/hook")
include_directories ("${PROJECT_BINARY_DIR}/src/light")
include_directories ("${PROJECT_BINARY_DIR}/src/move")
include_directories ("${PROJECT_BINARY_DIR}/src/object/inter")
include_directories ("${PROJECT_BINARY_DIR}/src/object/normal")
include_directories ("${PROJECT_BINARY_DIR}/src/option")
include_directories ("${PROJECT_BINARY_DIR}/src/parsing")
include_directories ("${PROJECT_BINARY_DIR}/src/ray")
include_directories ("${PROJECT_BINARY_DIR}/src/render")
include_directories ("${PROJECT_BINARY_DIR}/src/shadow")
include_directories ("${PROJECT_BINARY_DIR}/src/utils")
include_directories ("${PROJECT_BINARY_DIR}/lib/minilibx")

file(GLOB hook
    "*.h"
    "*.c"
)

file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/src/*.c)

#set (EXTRA_LIBS ${EXTRA_LIBS} ${X11_LIBRARIES} m)

add_executable (rt ${SRC_FILES})
target_link_libraries (rt ${EXTRA_LIBS} X11 Xext m ${PROJECT_BINARY_DIR}/lib/libmlx.a)

但是当我运行 make 时，我的静态库 minilibx 将无法编译。 X11 和 Xext 库中的所有函数都未定义的错误。

使 VERBOSE=1 结果：

正在链接 C 可执行文件 rt /usr/bin/cmake -E cmake_link_script CMakeFiles/rt.dir/link.txt --verbose=1 /usr/bin/cc CMakeFiles/rt.dir/src/move/translation.c.o CMakeFiles/rt.dir/src/move/rotation.c.o CMakeFiles/rt.dir/src/light/light .c.o CMakeFiles/rt.dir/src/option/option.c.o CMakeFiles/rt.dir/src/option/file_option.c.o CMakeFiles/rt.dir/src/render/render.c.o CMakeFiles/rt.dir/src/hook/control.c.o CMakeFiles/rt.dir/src/ray/eye.c.o CMakeFiles/rt.dir/src/ray/ray.c.o CMakeFiles/rt.dir/src/utils/my_strlen.c.o CMakeFiles/rt.dir/src/utils/my_strncpy.c.o CMakeFiles/rt.dir/src/object/inter/plan.c.o CMakeFiles/rt.dir/src/object/inter/cone.c.o CMakeFiles/rt.dir/src/object/inter/cylinder.c.o CMakeFiles/rt.dir/src/object/inter/sphere.c.o CMakeFiles/rt.dir/src/object/inter/tore.c.o CMakeFiles/rt.dir/src/object/normal/plan.c.o CMakeFiles/rt. dir/src/object/normal/cone.c.o CMakeFiles/rt.dir/src/object/normal/cylinder.c.o CMakeFiles/rt.dir/src/object/normal/sphere.c.o CMakeFiles/rt .dir/src/parsing/scene.c.o CMakeFiles/rt.dir/src/parsing/file_access.c.o CMakeFiles/rt.dir/src/parsing/str_tool.c.o CMakeFiles/rt.dir/src/shadow/shadow.c.o CMakeFiles/rt.dir/src/main.c.o -o rt -rdynamic -lX11 -lXext -lm lib/libmlx.a

这是一个错误示例：

lib/libmlx.a(mlx_init.o): 在函数mlx_int_deal_shm'中： mlx_init.c:(.text+0x2a): 未定义对 XShmQueryVersion 的引用' mlx_init.c:(.text+0x104): 未定义对“XShmPixmapFormat”的引用

如何解决未定义引用错误？

Answer 1

CMake 使用 target_link_libraries 指定您 link 反对哪些库。
在你的情况下，你似乎 link 反对正确的图书馆 (target_link_libraries (rt ${EXTRA_LIBS} X11 Xext m ${PROJECT_BINARY_DIR}/lib/libmlx.a))，所以我敢打赌他们没有找到。

尝试运行:
make VERBOSE=1

这将为您提供 gcc 输出。将它生成的最后几条 gcc 指令粘贴到此处，我们将了解为什么它找不到您的库。

Answer 2

问题已经解决，库的顺序不对

我只是 link 我的库在另一个库之前。 Et voilà :)

target_link_libraries (rt ${EXTRA_LIBS} ${PROJECT_BINARY_DIR}/lib/libmlx.a X11 Xext m)

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