在Windows上使用MinGW进行构建时，cmake FindBoost找不到Boost库
qtcreator支持qmake和cmake进行跨平台开发和
qmake对于在Windows上构建的msvc和MinGW都可以正常工作.但是，我只想支持一种工具:cmake.
qtcreator supports both qmake and cmake for cross platform development and
qmake works fine for both msvc and MinGW builds on Windows. However, I'd prefer to support just one tool: cmake.
位于 via-httplib 上的CMakeLists.txt在linux上以及使用时都可以正常工作cmake在Windows上构建msvc.
但是，当使用cmake在Windows上构建MinGW时，出现以下错误:
The CMakeLists.txt at via-httplib works fine on linux and when using cmake to build msvc on Windows.
However, when using cmake to build MinGW on Windows, I get the following error:
C:/Program上的Cake错误 文件/CMake/共享/cmake-3.13/Modules/FindBoost.cmake:2100(消息):
找不到请求的Boost库.
CMake Error at C:/Program Files/CMake/share/cmake-3.13/Modules/FindBoost.cmake:2100 (message):
Unable to find the requested Boost libraries.
增强版本:1.69.0
Boost version: 1.69.0
增强包含路径:D:/DevLibraries/boost/boost_1_69_0
Boost include path: D:/DevLibraries/boost/boost_1_69_0
找不到以下Boost库:
Could not find the following Boost libraries:
boost_system
未找到Boost库.您可能需要设置BOOST_LIBRARYDIR 到包含Boost库的目录或BOOST_ROOT到 Boost的位置.
No Boost libraries were found. You may need to set BOOST_LIBRARYDIR to the directory containing Boost libraries or BOOST_ROOT to the location of Boost.
在使用Visual Studio 15 2017 Win64生成器和默认的本机编译器时，都设置并找到了BOOST_LIBRARYDIR和BOOST_ROOT环境变量
Both the BOOST_LIBRARYDIR and BOOST_ROOT environment variables are set and are found when using the Visual Studio 15 2017 Win64 generator and default native compilers
错误消息表明，使用MinGW Makefiles和默认的本机编译器时，cmake查找BOOST_ROOT环境变量，但未找到BOOST_LIBRARYDIR.因此，似乎与此处描述的问题不同: Cmake找不到Boost
The error message indicates that when using the MinGW Makefiles and default native compilers, cmake finds the BOOST_ROOT environment variable but not BOOST_LIBRARYDIR. So it does not seem to be the same problem described here: Cmake doesn't find Boost
这是FindBoost.cmake中的错误吗?有解决方法"吗?
Is this a bug in FindBoost.cmake? Is there a "work around"?
这是FindBoost.cmake中的_boost_ARCHITECTURE_TAG的问题，如第1518行所述.
已添加该标记以处理Boost 1.66.0和更高版本.
It is an issue with the _boost_ARCHITECTURE_TAG in FindBoost.cmake, described on line 1518.
The tag was added to handle Boost 1.66.0 and later versions.
它没有将MinGW的_boost_ARCHITECTURE_TAG设置为-x64，因此它正在搜索boost库名称，例如:
It is not setting the _boost_ARCHITECTURE_TAG for MinGW to -x64, so it is searching for boost library names like:
libboost_system-mgw73-mt-d-1_69.a
代替:
libboost_system-mgw73-mt-d-x64-1_69.a
有一种解决方法:将cmake变量:Boost_ARCHITECTURE设置为-x64.
There is a workaround: set the cmake variable: Boost_ARCHITECTURE to -x64.
注意:将Boost_ARCHITECTURE设置为环境变量无效，因为FindBoost.cmake不会将Boost_ARCHITECTURE读取为环境变量.
Note: setting Boost_ARCHITECTURE as an environment variable does not work, as FindBoost.cmake does not read Boost_ARCHITECTURE as an environment variable.