如何在CMake构建过程中仅为已更改的头文件添加代码生成步骤？

我正在使用需要代码生成的ODB编写C++应用程序。我正在使用下面的CMake脚本。如何在CMake构建过程中仅为已更改的头文件添加代码生成步骤？

CMAKE_MINIMUM_REQUIRED(VERSION 2.8) 

CMAKE_POLICY(SET CMP0015 NEW) 

PROJECT(odb_poc) 

INCLUDE_DIRECTORIES(
    ${CMAKE_SOURCE_DIR}/src/ 
    ${CMAKE_SOURCE_DIR}/generated/) 

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y") 

MACRO(ODB_GENERATE header) 
    SET(cxxFile "${CMAKE_SOURCE_DIR}/generated/${header}-odb.cxx") 
    SET(hxxFile "${CMAKE_SOURCE_DIR}/generated/${header}-odb.hxx") 
    SET(ixxFile "${CMAKE_SOURCE_DIR}/generated/${header}-odb.ixx") 
    SET(sqlFile "${CMAKE_SOURCE_DIR}/generated/${header}.sql") 

    SET(ODB_GENERATED_FILES "${cxxFile} ${hxxFile} ${ixxFile} ${sqlFile}") 

    ADD_CUSTOM_COMMAND(
     OUTPUT ${ODB_GENERATED_FILES} 
     COMMAND odb -o ${CMAKE_SOURCE_DIR}/generated/ --std c++14 -d pgsql --generate-query --generate-schema 
       --show-sloc ${CMAKE_SOURCE_DIR}/src/${header}.hpp 
     DEPENDS ${CMAKE_SOURCE_DIR}/src/${header}.hpp 
     COMMENT "Generate database support code for ${header}.hpp") 

    ADD_CUSTOM_TARGET(RunGenerator-${header} DEPENDS ${ODB_GENERATED_FILES} 
         COMMENT "Checking if re-generation is required for ${header}.hpp") 

    ADD_DEPENDENCIES(${CMAKE_PROJECT_NAME} RunGenerator-${header}) 
ENDMACRO() 

ADD_EXECUTABLE(${CMAKE_PROJECT_NAME} 
    src/main.cpp 
    src/house.hpp 
    src/person.hpp 
    src/servkeys.hpp 
    generated/house-odb.cxx 
    generated/person-odb.cxx 
    generated/servkeys-odb.cxx) 

TARGET_LINK_LIBRARIES(${CMAKE_PROJECT_NAME} 
    odb 
    odb-pgsql) 

ODB_GENERATE(house) 
ODB_GENERATE(person) 
ODB_GENERATE(servkeys)

的问题是，每个从由ODB生成的数据库支持代码的头文件中的一个被改变时，所有文件的代码进行再生。下面是构建过程的输出：

14:11:03: Running steps for project odb_poc... 
14:11:03: Starting: "/usr/bin/cmake" --build . --target all 
[ 10%] Generate database support code for person.hpp 
person-odb.hxx: 220 
person-odb.ixx: 46 
person-odb.cxx: 625 
total: 891 
[ 20%] Checking if re-generation is required for person.hpp 
[ 20%] Built target RunGenerator-person 
[ 30%] Generate database support code for house.hpp 
house-odb.hxx: 205 
house-odb.ixx: 46 
house-odb.cxx: 580 
total: 831 
[ 40%] Checking if re-generation is required for house.hpp 
[ 40%] Built target RunGenerator-house 
[ 50%] Generate database support code for servkeys.hpp 
servkeys-odb.hxx: 563 
servkeys-odb.ixx: 46 
servkeys-odb.cxx: 1477 
total: 2086 
[ 60%] Checking if re-generation is required for servkeys.hpp 
[ 60%] Built target RunGenerator-servkeys 
Scanning dependencies of target odb_poc 
[ 70%] Building CXX object CMakeFiles/odb_poc.dir/src/main.cpp.o 
[ 80%] Building CXX object CMakeFiles/odb_poc.dir/generated/house-odb.cxx.o 
[ 90%] Building CXX object CMakeFiles/odb_poc.dir/generated/person-odb.cxx.o 
[100%] Building CXX object CMakeFiles/odb_poc.dir/generated/servkeys-odb.cxx.o 
Linking CXX executable odb_poc 
[100%] Built target odb_poc 
14:11:06: The process "/usr/bin/cmake" exited normally. 
14:11:06: Elapsed time: 00:04.

如何改变CMake的脚本这样的方式只为改变的报头的代码再生？

来源

2016-07-08 bobeff

我删除了来自该行的报价：

SET(ODB_GENERATED_FILES "${cxxFile} ${hxxFile} ${ixxFile} ${sqlFile}")

将其更改为：

SET(ODB_GENERATED_FILES ${cxxFile} ${hxxFile} ${ixxFile} ${sqlFile})

，这解决了这个问题。

来源

2016-07-08 12:05:26 bobeff

但正如另一个人指出的那样，不需要ADD_CUSTOM_TARGET和ADD_DEPENDENCES。 – bobeff

如何在CMake构建过程中仅为已更改的头文件添加代码生成步骤？

回答

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