用CMake构建cpp-netlib

Question

我下载了cpp-netlib源代码，将其解压缩到一个文件夹中，由于某种原因，我完全迷路了。我仔细阅读了文档，它说明我也必须下载CMake，我也下载了。然后设置源目录并构建目录，然后单击"Generate“按钮，得到如下输出：

The CXX compiler identification is MSVC 19.0.23506.0
Check for working C compiler using: Visual Studio 14 2015
Check for working C compiler using: Visual Studio 14 2015 -- works
Detecting C compiler ABI info
Detecting C compiler ABI info - done
Check for working CXX compiler using: Visual Studio 14 2015
Check for working CXX compiler using: Visual Studio 14 2015 -- works
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Detecting CXX compile features
Detecting CXX compile features - done
CMake Error at C:/Program Files (x86)/CMake/share/cmake-3.5/Modules/FindBoost.cmake:1657 (message):
  Unable to find the requested Boost libraries.

  Unable to find the Boost header files.  Please set BOOST_ROOT to the root
  directory containing Boost or BOOST_INCLUDEDIR to the directory containing
  Boost's headers.
Call Stack (most recent call first):
  CMakeLists.txt:49 (find_package)


Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing:  OPENSSL_LIBRARIES OPENSSL_INCLUDE_DIR) 
Looking for pthread.h
Looking for pthread.h - not found
Found Threads: TRUE  
CMake Error at CMakeLists.txt:131 (export):
  export given target "cppnetlib-client-connections" which is not built by
  this project.


Configuring incomplete, errors occurred!
See also "C:/Users/Nick/Documents/cpp-netlib/cpp-netlib-build/CMakeFiles/CMakeOutput.log".
See also "C:/Users/Nick/Documents/cpp-netlib/cpp-netlib-build/CMakeFiles/CMakeError.log"

它找不到Boost库，这就是我被困的地方。我安装了boost，但是我不知道在哪里设置"BOOST_ROOT“。我对此做了一些研究，尝试使用命令行和-DBOOST_ROOT选项，如下所示：

c:\Program Files>cmake -DBOOST_ROOT=/boost/boost_1_55_0

但它给了我以下错误：

CMake Error: The source directory "C:/Program Files" does not appear to contain
CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.

我真的不知道现在该怎么办，我觉得我的问题还没有结束.我有什么明显的遗漏吗？

Answer 1

您需要从源树(它将包含CMakeLists.txt)运行cmake，或者更典型地，从构建文件夹运行cmake并告诉它源树在哪里。常见的情况是在源树旁边创建一个构建文件夹并运行cmake ../sourcedir。

您似乎最初使用了gui；当然，这提供了一种设置BOOST_ROOT变量的方法？

或者，如果您只是在VC++包含/LIB路径中添加了boost (或者在vc目录中，或者通过设置%INCLUDE%/%LIB%)，那么您可能不需要BOOST_ROOT。OpenSSL也一样。