错误C1083（文件未找到）与CMAKEtarget_include_directories

Question

我在源代码树中将c项目拆分为几个不同的库/可执行文件。有一个顶级的Cmake文件，其中包括一些子目录。一个叶库B链接到另一个叶库A。然而，即使A公开添加了target_include_directories，在B中，我得到了错误C1083——无法打开包含文件。

操作系统：Win10

使用GCC 7.3.0工具包：

>

CMake命令“C:\Program Files\CMake\bin\CMake.EXE”-no warn unused cli-DMOCK\u SIMCONNECT:BOOL=TRUE”-DP3D\u SDK\u ROOT:STRING=C:/Program Files/Lockheed Martin/Prepar3D v4 SDK 4.5.14.34698”-DCMAKE\u EXPORT\u COMPILER\u命令：BOOL=TRUE-DCMAKE\u C\u COMPILER:FILEPATH=C:\Qt\Tools\mingw730\u 64\bin\gcc。exe-DCMAKE_CXX_编译器：FILEPATH=C:\Qt\Tools\mingw730_64\bin\g。exe-Hd:/repos/cmake_sample_project-Bd:/repos/cmake_sample_project/build-G“MinGW Makefiles”

错误消息：

[build] D:\repos\cmake_sample_project\src\B\libB.h:5:10: fatal error: libA.h: No such file or directory
[build]  #include "libA.h"
[build]           ^~~~~~~~
[build] compilation terminated.

使用工具包Visual Studio Build Tools 2017发布版-amd64：

>

CMake命令：“C:\Program Files\CMake\bin\CMake.EXE”-no warn unused cli-DMOCK\u SIMCONNECT:BOOL=TRUE”-DP3D\u SDK\u ROOT:STRING=C:/Program Files/Lockheed Martin/Prepar3D v4 SDK 4.5.14.34698”-DCMAKE\u EXPORT\u COMPILE\u命令：BOOL=TRUE-DCMAKE\u BUILD\u TYPE:STRING=Debug-Hd:/repos/CMake\u sample\u project-Bd:/repos/CMake\u sample\u project/BUILD-G“Visual Studio 2017”-=15-x64

错误消息：

d:\repos\cmake_sample_project\src\b\libB.h(5): fatal error C1083: Datei (Include) kann nicht geöffnet werden: "libA.h": No such file or directory [D:\repos\cmake_sample_project\build\src\B\libB-obj.vcxproj]

sample_cmake_project
|   CMakeLists.txt
|   
+---src
|   |   CMakeLists.txt
|   |   
|   +---A
|   |   |   CMakeLists.txt
|   |   |   libA.cpp
|   |   |   
|   |   \---public
|   |           libA.h
|   |           
|   \---B
|           CMakeLists.txt
|           libB.cpp
|           libB.h
|           
\---tests
        CMakeLists.txt

样本_cmake_项目/CMakeLists。txt:

cmake_minimum_required(VERSION 3.12)

project(sample_project LANGUAGES CXX)

add_subdirectory(src)

enable_testing()
add_subdirectory(tests)

样本cmake项目/src/CMakeLists。txt

add_subdirectory(A)
add_subdirectory(B)

示例cmake项目/src/A/CMakeLists。txt

add_library(libA-obj OBJECT "")

target_sources(libA-obj 
    PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/libA.cpp
    PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}/public/libA.h # <-- header is added as public source.
)

add_library(libA STATIC $<TARGET_OBJECTS:libA-obj>)

target_include_directories(libA PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/public) # <-- public dir is added to the target's PUBLIC include directories.

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/public)

样本项目/src/B/CMakeLists。txt:

add_library(libB-obj OBJECT "")

target_sources(libB-obj 
    PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/libB.cpp
    PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}/libB.h
)

add_library(libB STATIC $<TARGET_OBJECTS:libA-obj>)

target_link_libraries(libB PRIVATE libA)

include_directories(${CMAKE_CURRENT_SOURCE_DIR})

示例_cmake_project/src/A/public/libA。h:

#ifndef __LIBA_H
#define __LIBA_H

#include <iostream>

class A 
{
    public:
    A() { std::cout << "hello" << std::endl; };
    ~A() { std::cout << "bye bye" << std::endl; };

    void saySomething();
};

#endif

样本_cmake_项目/src/A/libA。cpp：

#include "libA.h"

void A::saySomething()
{
    std::cout << "something..." << std::endl;
}

示例_cmake_project/src/B/libB。h:

#ifndef __LIB_B
#define __LIB_B

#include <iostream>
#include "libA.h"

class B
{
public:
    B();
    ~B();

    void saySomething();

private:
    A _a;
};

#endif

sample_cmake_project/src/B/libB. cpp：

#include "libB.h"

B::B() :
    _a(A())
{
    std::cout << "Hello from lib B" << std::endl;
    _a.saySomething();
}

我觉得我可能遗漏了一些基本的东西，但是我认为通过将sample_cmake_project/A/public添加到libA目标的包含目录中，libA. h头应该可以用于链接到libA的库，例如libB？

有什么建议吗？提前谢谢。




Answer 1

错误消息指向libB-obj，这是用于创建静态库libB的对象库。libB-obj没有链接到libA，因此libA的公共包含目录不适用于libB-obj。

add_library(libB-obj OBJECT "")

target_sources(libB-obj 
    PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/libB.cpp
    PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}/libB.h
)

add_library(libB STATIC $<TARGET_OBJECTS:libA-obj>)

target_link_libraries(libB-obj PRIVATE libA) # --> link libB-obj instead of static library libB!

include_directories(${CMAKE_CURRENT_SOURCE_DIR})