yaml-cpp

Fails to compile. Undefined reference to YAML::LoadFile

链接错误，链接了错误的库

官网给出的build方式没有包含Mingw编译器的，如果使用yaml-cpp的项目使用Mingw编译，则yaml-cpp也需要用Mingw编译（而不是网上随便下一个）

cmake.exe -G ，-G可以指定编译器（Generator）

调用cmake --help会显示可用的Generator

Generators

The following generators are available on this platform (* marks default):
  Visual Studio 17 2022        = Generates Visual Studio 2022 project files.
                                 Use -A option to specify architecture.
* Visual Studio 16 2019        = Generates Visual Studio 2019 project files.
                                 Use -A option to specify architecture.
  Visual Studio 15 2017 [arch] = Generates Visual Studio 2017 project files.
                                 Optional [arch] can be "Win64" or "ARM".
  Visual Studio 14 2015 [arch] = Generates Visual Studio 2015 project files.
                                 Optional [arch] can be "Win64" or "ARM".
  Visual Studio 12 2013 [arch] = Generates Visual Studio 2013 project files.
                                 Optional [arch] can be "Win64" or "ARM".
  Visual Studio 11 2012 [arch] = Generates Visual Studio 2012 project files.
                                 Optional [arch] can be "Win64" or "ARM".
  Visual Studio 10 2010 [arch] = Deprecated.  Generates Visual Studio 2010
                                 project files.  Optional [arch] can be
                                 "Win64" or "IA64".
  Visual Studio 9 2008 [arch]  = Generates Visual Studio 2008 project files.
                                 Optional [arch] can be "Win64" or "IA64".
  Borland Makefiles            = Generates Borland makefiles.
  NMake Makefiles              = Generates NMake makefiles.
  NMake Makefiles JOM          = Generates JOM makefiles.
  MSYS Makefiles               = Generates MSYS makefiles.
  MinGW Makefiles              = Generates a make file for use with
                                 mingw32-make.
  Green Hills MULTI            = Generates Green Hills MULTI files
                                 (experimental, work-in-progress).
  Unix Makefiles               = Generates standard UNIX makefiles.
  Ninja                        = Generates build.ninja files.
  Ninja Multi-Config           = Generates build-<Config>.ninja files.
  Watcom WMake                 = Generates Watcom WMake makefiles.
  CodeBlocks - MinGW Makefiles = Generates CodeBlocks project files.
  CodeBlocks - NMake Makefiles = Generates CodeBlocks project files.
  CodeBlocks - NMake Makefiles JOM
                               = Generates CodeBlocks project files.
  CodeBlocks - Ninja           = Generates CodeBlocks project files.
  CodeBlocks - Unix Makefiles  = Generates CodeBlocks project files.
  CodeLite - MinGW Makefiles   = Generates CodeLite project files.
  CodeLite - NMake Makefiles   = Generates CodeLite project files.
  CodeLite - Ninja             = Generates CodeLite project files.
  CodeLite - Unix Makefiles    = Generates CodeLite project files.
  Eclipse CDT4 - NMake Makefiles
                               = Generates Eclipse CDT 4.0 project files.
  Eclipse CDT4 - MinGW Makefiles
                               = Generates Eclipse CDT 4.0 project files.
  Eclipse CDT4 - Ninja         = Generates Eclipse CDT 4.0 project files.
  Eclipse CDT4 - Unix Makefiles= Generates Eclipse CDT 4.0 project files.
  Kate - MinGW Makefiles       = Generates Kate project files.
  Kate - NMake Makefiles       = Generates Kate project files.
  Kate - Ninja                 = Generates Kate project files.
  Kate - Unix Makefiles        = Generates Kate project files.
  Sublime Text 2 - MinGW Makefiles
                               = Generates Sublime Text 2 project files.
  Sublime Text 2 - NMake Makefiles
                               = Generates Sublime Text 2 project files.
  Sublime Text 2 - Ninja       = Generates Sublime Text 2 project files.
  Sublime Text 2 - Unix Makefiles
                               = Generates Sublime Text 2 project files.

windows下直接调用cmake会默认用当前安装的visual studio版本对应的编译器，因此需要指定编译器

cmake步骤

• github clone源码，（最好新建一个build目录，然后cd到该目录下）执行以下cmake命令（指定编译器为Mingw）

  cmake.exe -G "MinGW Makefiles" .

  官方的build说明，不指定-DYAML_BUILD_SHARED_LIBS=on的话默认是静态库

  mkdir build
  cd build
  cmake [-G generator] [-DYAML_BUILD_SHARED_LIBS=on|OFF] ..

• 运行make以执行makefile，window下需要额外安装[GNU](GnuWin download | SourceForge.net)，配环境变量的路径后还是不能执行make的话，就直接拖动安装目录下的make.exe到cmd里执行

• build目录下出现libyaml-cpp.dll文件，直接拖过去用，target_link_libraries里包含该文件路径，target_include_directories包含yaml-cpp源码的include目录，将该文件添加到build目录下

参考

• Fails to compile. Undefined reference to YAML::LoadFile · Issue #591 · jbeder/yaml-cpp (github.com)
• jbeder/yaml-cpp: A YAML parser and emitter in C++ (github.com)