CMake构建库和可执行文件一次并链接它

Question

我正在尝试同时使用 cmake 构建两个项目。 我的文件夹结构如下：

project
├── CMakeLists.txt
├── build
├── out
├── lib
├── yanthra_engine
│   ├── CMakeLists.txt
│   └── ...
└───sandbox
    ├── CMakeLists.txt
    └── ...

  

主 CmakeLists.txt

cmake_minimum_required(VERSION 3.4.1)
project(yanthra_console VERSION 0.1 DESCRIPTION "A 3d Game Engine.")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -fexceptions")
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

set(CMAKE_CONFIGURATION_TYPES "RelWithDebInfo;Release;Debug" CACHE STRING "Build type selections" FORCE)

add_subdirectory(yanthra_engine)
add_subdirectory(sandbox)

yanthra_engine/CMakeLists.txt

set(THIRD_PARTY_DIR "../../../third-party")
set(MAIN_SOURCE_DIR "../../main/src")
include_directories(${THIRD_PARTY_DIR}/SDL/include)



set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../lib )

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../lib)



file(GLOB_RECURSE CPP_HEADERS ${MAIN_SOURCE_DIR}/*.hpp)
file(GLOB_RECURSE CPP_SOURCES ${MAIN_SOURCE_DIR}/*.cpp)


add_library(
   yanthra
   SHARED
   ${CPP_HEADERS}
   ${CPP_SOURCES}
)


set (CMAKE_SHARED_LINKER_FLAGS "-F../yanthra_engine/Frameworks -framework SDL2 -framework OpenGL")

沙盒/CMakeLists.txt

set(THIRD_PARTY_DIR "../../main")
set(MAIN_SOURCE_DIR "./src")
include_directories(${THIRD_PARTY_DIR}/include)

set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/../out)

file(GLOB_RECURSE CPP_HEADERS ${MAIN_SOURCE_DIR}/includes/*.h)
file(GLOB_RECURSE CPP_SOURCES ${MAIN_SOURCE_DIR}/*.cpp)
file(GLOB_RECURSE LIB ${MAIN_SOURCE_DIR}/../lib/*.dylib)

add_executable(
    yanthra_sandbox
    ${CPP_HEADERS}
    ${CPP_SOURCES}
    )

set_target_properties(
    yanthra_sandbox
    PROPERTIES
    LINK_FLAGS
    "-F../yanthra_engine/Frameworks -framework SDL2 -framework OpenGL"
    )

target_link_libraries(yanthra_sandbox PRIVATE ${LIB})

我想知道我是否在每种构建模式下生成库文件，我将如何将它与相应的可执行文件链接起来，因为每种模式都将其输出构建到自己的文件夹，即库其 lib/调试（用于调试模式）和可执行的输出/调试。

Answer 1

您似乎没有将链接链接到 yanthra 目标。不过您应该这样做，因为这会自动选择使用当前配置编译的库。

沙盒/CMakeLists.txt

...
target_link_libraries(yanthra_sandbox PRIVATE yanthra ${LIB})
...

至于导入其他库：最好使用find_library。这应该会自动设置链接选项，并且不需要为yanthra_sandbox 添加它们。

yanthra_engine/CMakeLists.txt

...

list(APPEND CMAKE_FRAMEWORK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/Frameworks")

find_library(SDL2_LIB SDL2 REQUIRED)
find_library(OPEN_GL_LIB OpenGL REQUIRED)

target_link_library(yanthra PUBLIC "${SDL2_LIB}" "${OPEN_GL_LIB}")

这应该允许您从两个目标中删除编译器标志。如果 lib 目录中没有依赖项，您还可以删除对文件系统上的库的搜索/