Question

我的代码组织如下：

CPP
- main.cpp（调用来自dataStructures/和common/的代码）
- CMakeLists.txt（ topmost CMakeLists文件）
- 构建
- 共同
  - CMakeLists.txt（应负责构建通用共享库）
  - 包括
    - utils.h
  - SRC
    - utils.cpp
  - 构建
- 数据结构
  - CMakeLists.txt（构建dataStructures共享库 - 依赖于公共库）
  - 包括
    - dsLinkedList.h
  - SRC
    - dsLinkedList.cpp
  - 构建

build\目录包含构建的目标。实际代码可以在这里看到：https://github.com/brainydexter/PublicCode/tree/master/cpp

截至目前，每个子目录中的CMakeLists.txt都构建了自己的共享库。最顶层的CMakeLists文件然后引用像这样的库和路径

最顶层的CMakeLists.txt

cmake_minimum_required(VERSION 3.2.2)
project(cpp)

#For the shared library:
set ( PROJECT_LINK_LIBS libcppDS.dylib libcppCommon.dylib)
link_directories( dataStructures/build )
link_directories( common/build )

#Bring the headers, into the project
include_directories(common/include)
include_directories(dataStructures/include)

#Can manually add the sources using the set command as follows:
set(MAINEXEC main.cpp)

add_executable(testDS ${MAINEXEC})
target_link_libraries(testDS ${PROJECT_LINK_LIBS} )

如何更改最顶层的CMakeLists.txt以进入子目录（common和dataStructures）并构建目标（如果它们尚未构建），而无需我手动构建单个库？

CMakeLists common ：

cmake_minimum_required(VERSION 3.2.2)
project(cpp_common)
set(CMAKE_BUILD_TYPE Release)

#Bring the headers, such as Student.h into the project
include_directories(include)

#However, the file(GLOB...) allows for wildcard additions:
file(GLOB SOURCES "src/*.cpp")

#Generate the shared library from the sources
add_library(cppCommon SHARED ${SOURCES})

dataStructures ：

cmake_minimum_required(VERSION 3.2.2)
project(cpp_dataStructures)
set(CMAKE_BUILD_TYPE Release)

#For the shared library:
set ( PROJECT_LINK_LIBS libcppCommon.dylib )
link_directories( ../common/build )

#Bring the headers, such as Student.h into the project
include_directories(include)
include_directories(../common/include/)

#However, the file(GLOB...) allows for wildcard additions:
file(GLOB SOURCES "src/*.cpp")

#Generate the shared library from the sources
add_library(cppDS SHARED ${SOURCES})

更新

这个拉取请求帮助我理解了这样做的正确方法： https://github.com/brainydexter/PublicCode/pull/1

和commitId：4b4f1d3d24b5d82f78da3cbffe423754d8c39ec0 on my git

Answer 1

你只是错过了一件简单的事：add_subdirectory。来自文档：

add_subdirectory(source_dir [binary_dir] [EXCLUDE_FROM_ALL])

向构建添加子目录。 source_dir指定源CMakeLists.txt和代码文件所在的目录。如果它是相对路径，它将根据当前目录（典型用法）进行评估，但它也可能是绝对路径。 binary_dir指定放置输出文件的目录。如果它是相对路径，它将根据当前输出目录进行评估，但它也可能是绝对路径。

http://www.cmake.org/cmake/help/v3.0/command/add_subdirectory.html

它完全符合您的需要。

如何使用cmake在子目录中构建库？

1 个答案: