如何这类源发生器集成到CMake的构建链？(How to integrate such kind o

我正在写一个C ++项目，该项目使用代码生成器（perl的xsubpp）。它产生从XS文件C / C ++源代码。作为xsubpp有时会产生不完整的输出文件，我想拥有它运行实际的二进制目标是建立之前，无论存在生成的源文件。

我可以找出两种方式来实现这一目标：

# the target is always out-of-date, so the command is always run
add_custom_target(...)
add_library(lib_name ...)
add_dependencies(lib_name ...)

和

add_library(lib_name ...)
# the command is always run before lib_name is build
add_custom_command(TARGET lib_name PRE_BUILD ...)

然而，他们没有工作，因为add_library()在配置时检查源文件。源文件必须要么存在，或作为输出对象add_custom_command()

对于第一种方式，所述add_custom_target()没有输出对象的概念; 和用于第二方式， add_custom_command()被用作lib_name的辅助，这也没有输出对象的概念。

以下为我工作。我希望这是你想要的。

源（Foo.cpp中）被重新生成每次运行腾出时间。

SRC / C_generated /的CMakeLists.txt：

add_custom_target(generate_foo 
  touch ${CMAKE_CURRENT_SOURCE_DIR}/script.sh
  COMMENT "add_custom_target, touch script.sh"
)

ADD_CUSTOM_COMMAND(
  TARGET generate_foo
  COMMAND   ${CMAKE_CURRENT_SOURCE_DIR}/script.sh
  ARGS      "some args"
  COMMENT "custom commands, executing script.sh"
    )

set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/foo.cpp PROPERTIES GENERATED 1)

add_library(LIBC ${CMAKE_CURRENT_BINARY_DIR}/foo.cpp)
ADD_DEPENDENCIES(LIBC generate_foo)

SRC / C_generated / script.sh：

#!/bin/bash

echo "Running script.sh"

echo "#include <stdio.h>" > foo.cpp
echo "/*" >> foo.cpp
date >> foo.cpp
echo "*/" >> foo.cpp
echo >> foo.cpp
echo "void testC()" >> foo.cpp
echo "{" >> foo.cpp
echo "  printf(\"Generated source.\");" >> foo.cpp
echo "}" >> foo.cpp

主要的CMakeLists.txt其结合与非生成的源生成的源：

project(test)
cmake_minimum_required(VERSION 2.8)
INCLUDE_DIRECTORIES(src)
ADD_SUBDIRECTORY(src/A)
ADD_SUBDIRECTORY(src/B)
# Generated files only.
ADD_SUBDIRECTORY(src/C_generated)

# Combine the different libraries into one.
add_library(TESTLIB STATIC src/dummy.c)

ADD_DEPENDENCIES(TESTLIB LIBA)
ADD_DEPENDENCIES(TESTLIB LIBB)
ADD_DEPENDENCIES(TESTLIB LIBC)

GET_TARGET_PROPERTY(LIBA_LOC LIBA LOCATION)
GET_TARGET_PROPERTY(LIBB_LOC LIBB LOCATION)
GET_TARGET_PROPERTY(LIBC_LOC LIBC LOCATION)

SET_TARGET_PROPERTIES(TESTLIB PROPERTIES STATIC_LIBRARY_FLAGS "${LIBA_LOC} ${LIBB_LOC} ${LIBC_LOC}")

从下载例如：

https://dl.dropboxusercontent.com/u/68798379/cmake-code-generator.tar.bz2