i am using Jetbrains CLion 2017.3 and the bundled CMake version 3.9.6 with mingw64 5.0 version/g++ 7.1.
Although reading the "Mastering CMake" ( i am new to CMake !) i have many difficulties to understand the basics. Since 3 days i am searching for a CMake solution to create a own header-only library that uses the boost (1.66.0 ) libraries.

我使用的是JetBrains Clion 2017.3和捆绑的CMake版本3.9.6和mingw645.0版本/g++7.1。虽然正在阅读《掌握CMake》(我是新手！)我要理解这些基本知识有很多困难。3天以来，我一直在寻找一种CMake解决方案来创建自己的仅包含头文件的库，该库使用Boost(1.66.0)库。

Using my CMakeLists.txt results in finding the boost libraries, but i cannot include boost headers in a header file from my current source directory.

使用我的CMakeLists.txt可以找到boost库，但是我不能在当前源目录的头文件中包含boost头文件。

My current source diretory contains the "CMakeLists.txt" and the header file
"test_boost.h".
If i try to include boost headers in the header file "test_boost.h", boost headers cannot be found !

我当前的源代码目录包含“CMakeLists.txt”和头文件“test_boost.h”。如果我尝试在头文件“test_boost.h”中包含Boost标头，则找不到Boost标头！

What i am doing wrong ?

我做错了什么？

My CMakeLists.txt :

我的CMakeLists.txt：

cmake_minimum_required(VERSION 3.9)
project(headerOnlyLib1)

set(CMAKE_CXX_STANDARD 11)

set(ENV{BOOST_ROOT} "C:/dev/boost/mingw/boost_1_66_0/boost")
set(Boost_USE_STATIC_LIBS        ON) # only find static libs
set(Boost_USE_MULTITHREADED      ON)
set(Boost_USE_STATIC_RUNTIME    OFF)
find_package(BOOST 1.66 REQUIRED)
IF (Boost_FOUND)
    message(STATUS "BOOST FOUND !")
ELSE()
    message(STATUS "BOOST NOT Found !")
endif()
add_library(headerOnlyLib INTERFACE)
target_include_directories(headerOnlyLib INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
target_include_directories(headerOnlyLib INTERFACE ${Boost_INCLUDE_DIRS})
target_link_libraries(headerOnlyLib ${Boost_LIBRARIES})

Short answer: You can't.

简短的回答是：你不能。

A "header-only library" is just that, one or more headers, only. It's not something that is linked or really stand-alone.

一个“header-only library”仅仅是一个或多个headers。这不是一个相互联系或独立的东西。

If your header-only library have dependencies, then the users of your library also have those dependencies and need to include them in their own build.

如果您的只有头的库有依赖项，那么您的库的用户也有这些依赖项，并且需要将它们包括在他们自己的构建中。

I think that you can, but you need to be more specific in defining your boost dependencies.

我认为你可以，但是你需要更具体地定义你的boost依赖项。

For example, the CMakeLists.txt file here depends upon boost::system for boost::asio. The dependency is defined as follows:

例如，这里的CMakeLists.txt文件依赖于Boost：：System for Boost：：ASIO。依赖关系的定义如下：

find_package(Boost REQUIRED COMPONENTS system)
if(Boost_FOUND)
  target_include_directories(${PROJECT_NAME} PRIVATE ${Boost_INCLUDE_DIRS})

  # Boost::asio is header only but it requires Boost::system
  target_link_libraries(${PROJECT_NAME} INTERFACE Boost::system)
.
.
.
endif(Boost_FOUND)

In your case, the target is Boost::boost for header-only dependencies, see FindBoost. So the relevant part becomes:

在您的例子中，目标是Boost：：Boost以获取仅有头的依赖项，请参见FindBoost。因此，相关部分变成：

find_package(Boost 1.66 REQUIRED COMPONENTS boost)
IF (Boost_FOUND)
    message(STATUS "BOOST FOUND !")
    target_include_directories(headerOnlyLib INTERFACE ${Boost_INCLUDE_DIRS})
ELSE()
    message(STATUS "BOOST NOT Found !")
endif()

I recommend watching Daniel Pfeifer's talk at C++ Now 2017 for more information.

A lot has changed since "Mastering CMake" was written...

我推荐观看Daniel Pfeifer在C++Now 2017上的演讲，以了解更多信息。自从《精通CMake》写出来之后发生了很大的变化。

Here is a minimal CMake example to include header-only BOOST PropertyTree library

下面是一个包含仅包含头的Boost PropertyTree库的最小CMake示例

• CMakeLists.txt

cmake_minimum_required(VERSION 3.15)
set(PROJECT_NAME test)

project(${PROJECT_NAME})

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Boost 1.82 REQUIRED)
include_directories("${Boost_INCLUDE_DIRS}")
add_executable(${PROJECT_NAME} "src/main.cpp")

• src/main.cpp

#include <boost/property_tree/ptree.hpp>

int main() {
  boost::property_tree::ptree root;
  root.put("A", "B");
}

• Compile with

mkdir build
cd build
cmake ..
make