C++ 在 CMake 中添加自定义构建步骤
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Add custom build step in CMake
提问by David Bulczak
I'm trying to add a custom build step in CMake that generates some files. I haven't found a description how it works.
我正在尝试在 CMake 中添加一个生成一些文件的自定义构建步骤。我还没有找到它是如何工作的描述。
I have an project where source, header & implementation files have to be generated by ODB for C++. ODB takes class headers as arguments and generates source files that I want to use in my project.
我有一个项目，其中必须由 ODB for C++ 生成源文件、头文件和实现文件。ODB 将类头作为参数并生成我想在我的项目中使用的源文件。
Right now I have the following command in my CMakeLists.txt:
现在我的 CMakeLists.txt 中有以下命令：
add_custom_command(TARGET ${PROJECT_NAME}
PRE_BUILD
COMMAND odb -o /home/david/dev/ --std c++11 -I/home/david/dev/ -d sqlite --generate- query --generate-schema ${PROMOTER_LIB_PREFIX}/entities/person.hpp
DEPENDS ${PROJECT_NAME}
VERBATIM
)
For a file person.hppODB should generate person-odb.hxx, person-odb.cxx, person-odb.ixxbut the CMake command I''ve used doesn't generate anything. In a terminal this command works fine.
对于文件person.hppODB 应该生成person-odb.hxx, person-odb.cxx，person-odb.ixx但我使用的 CMake 命令不会生成任何内容。在终端中，此命令工作正常。
What am I doing wrong?
我究竟做错了什么？
EDIT: The problem can be solved by adding the following lines:
编辑：问题可以通过添加以下几行来解决：
set(FAKE_TARGET fakeTarget)
add_custom_target(fakeTarget
odb -o /home/david/dev/ --std c++11 -I/home/david/dev/ -d sqlite --generate-query --generate-schema ${PROMOTER_LIB_PREFIX}/entities/person.hpp
)
add_dependencies(${PROJECT_NAME} ${FAKE_TARGET})
回答by Pierre Fourgeaud
For me, with something similar, I just use :
对我来说，类似的东西，我只是使用：
add_custom_command(TARGET ${PROJECT_NAME}
PRE_BUILD
COMMAND odb -o /home/david/dev/ --std c++11 -I/home/david/dev/ -d sqlite --generate- query --generate-schema ${PROMOTER_LIB_PREFIX}/entities/person.hpp
)
We don't use DEPENDSor VERBATIM.
我们不使用DEPENDS或VERBATIM。
The DEPENDSoption specify that the command must be executed only after that the project you gave to this option is built.
该DEPENDS选项指定该命令必须在您提供给该选项的项目构建完成后才执行。
EDIT :
编辑 ：
Note that the PRE_BUILD option is only supported on Visual Studio 7 or later. For all other generators PRE_BUILD will be treated as PRE_LINK.
请注意，PRE_BUILD 选项仅在 Visual Studio 7 或更高版本上受支持。对于所有其他生成器，PRE_BUILD 将被视为 PRE_LINK。
Maybe that's why it doesn't work for you.
也许这就是它对你不起作用的原因。
A work around could be (a bit ugly) :
解决方法可能是（有点难看）：
- Create a fake project
- Add your custom command on it as POST_BUILD
- Make you current project dependent on the fake one
- 创建一个假项目
- 将您的自定义命令添加为 POST_BUILD
- 让你当前的项目依赖于假的
回答by graywolf
Way I'm using it is:
我使用它的方式是：
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/gen_icinstrtab.hpp
COMMAND xsltproc --output ${CMAKE_CURRENT_BINARY_DIR}/gen_icinstrtab.hpp ${CMAKE_SOURCE_DIR}/xml/genictabc.xslt ${CMAKE_SOURCE_DIR}/xml/icminstr.xml
)
add_executable(
du4
${CMAKE_CURRENT_BINARY_DIR}/gen_icinstrtab.hpp
.
.
.
)
The key was to add even .hpp files into add_executable block.
关键是将 .hpp 文件添加到 add_executable 块中。
