使用cmake处理头文件依赖项 [英] Handling header files dependencies with cmake

问题描述

我在一个小C ++项目上使用CMake，到目前为止它工作得很好...有一个扭曲：x

I am using CMake on a small C++ project and so far it works great... with one twist :x

当我更改头文件时，需要重新编译多个源文件（包括直接或间接的源文件），但是似乎cmake只检测到要重新编译的源文件中的一些，导致一个损坏的状态。我可以通过擦除项目和从头重建来解决这个问题，但是这绕过了使用make实用程序的目标：只重新编译需要的东西。

When I change a header file, it typically requires recompiling a number of sources files (those which include it, directly or indirectly), however it seems that cmake only detects some of the source files to be recompiled, leading to a corrupted state. I can work around this by wiping out the project and rebuilding from scratch, but this circumvents the goal of using a make utility: only recompiling what is needed.

因此，我假设我做错了。

Therefore, I suppose I am doing something wrong.

我的项目非常简单：

• 所有公开标题所在的include目录（在各个子目录中）

一个src目录，其中包含源文件的所有子目录，src CMakeLists.txt位于

• src目录中每个子目录的CMakeLists.txt

• a top directory where all resources sit, the main CMakeLists.txt sits there
• a "include" directory where all public headers lies (in various subdirectories)
• a "src" directory where all the subdirectories for sources files are, the src CMakeLists.txt sits there
• a CMakeLists.txt per subdirectory in the "src" directory

主目录包含：

cmake_minimum_required(VERSION 2.8)

project(FOO)

set(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)

# Compiler Options
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -std=c++0x -Wall -Wextra -Werror")

include_directories($(FOO_SOURCE_DIR)/include)

add_subdirectory(src)

src目录：

add_subdirectory(sub1)
add_subdirectory(sub2)
add_subdirectory(sub3)
add_subdirectory(sub4)

add_executable(foo main.cpp)

target_link_libraries(foo sub1 sub2 sub3 sub4)

其中 sub4 取决于 sub3 ，它取决于 sub2 sub1

Where sub4 depends on sub3 which depends on sub2 which depends on sub1

以及子目录（sub3）的示例：

And an example of a subdirectory (sub3):

set(SUB3_SRCS
    File1.cpp
    File2.cpp
    File3.cpp
    File4.cpp
    File5.cpp
    File6.cpp
    )

add_library(sub3 ${SUB3_SRCS})

target_link_libraries(sub3 sub1 sub2)

我会很高兴，如果任何人可以指出我的错误，我在这里或在CMake搜索没有产生任何东西，所以我猜这很容易或应该开箱即用...

I'd be glad if anyone could point my mistake to me, searching here or on CMake didn't yield anything so I guess it's very easy or should work out of the box...

（参考，我在MSYS使用cmake版本2.8.2）

(for reference, I am using cmake version 2.8.2 on MSYS)

EDIT ：

感谢Bill的建议，我已经检查了 / code>文件生成的CMake，它确实缺乏（严重）。下面是一个例子：

Thanks to Bill's suggestion I have checked the depend.make file generated by CMake, and it is indeed lacking (severely). Here is an example:

src/sub3/CMakeFiles/sub3.dir/File1.cpp.obj: ../src/sub3/File1.cpp

是的，这是全部，没有包括所有参考：x

Yep, that's all, non of the includes were referenced at all :x

推荐答案

您应该查看二叉树中的 depend.make 文件。它将在 CMakeFiles / target.dir / depend.make 中。尝试找到一个缺少一个 .h 文件，你认为它应该有。然后为cmake创建一个错误报告或通过电子邮件发送cmake邮件列表。

You should look at the depend.make files in your binary tree. It will be in CMakeFiles/target.dir/depend.make. Try to find one of those that is missing a .h file that you think it should have. Then create a bug report for cmake or email the cmake mailing list.

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