如何在Linux上的C++程序中使用yaml-cpp？

Question

我最近决定使用yaml作为我的配置文件技术,并且正在OpenSuse 11.3上编写一个c ++ linux应用程序.

问题是,即使在成功安装cmake的,如图所示,YAML的CPP文档页面上compilling YAML-CPP,我仍然无法编译YAML-CPP页面上简单的演示程序在这里.

例如,当我尝试编译monster.yaml和main.cpp示例时

我的编译器在发出命令gcc main.cpp时发出以下错误:

main.cpp:24:25:错误:'YAML'没有命名类型
main.cpp:24:35:错误:在'&'标记
main.cpp 之前的预期unqualified-id :24:35:错误:预期') 'before'&'token
main.cpp:24:35:错误:'&'令牌
main.cpp 之前的预期初始化程序:30:25:错误:'YAML'没有命名类型
main.cpp:30:35:错误:'&'令牌
main.cpp 之前的预期unqualified-id :30:35:错误:预期')'在'''之前'令牌
main.cpp:30:35:错误:'&'令牌
main.cpp 之前的预期初始值设定项: 35:25:错误:'YAML'没有命名类型
main.cpp:35:35:错误:在'&'令牌
main.cpp:35:35:错误:预期')之前预期的unqualified-id' ''' 'token
main.cpp:35:35:错误:'&'令牌之前的预期初始值设定项

我尝试将include指令更改#include "yaml-cpp/yaml.h"为#include <yaml.h>,因为我已经安装了yaml lib,但这并没有解决任何问题.

那我做错了什么？

以下是从第24到40行粘贴的有问题的代码:

void operator >> (const YAML::Node& node, Vec3& v) {
   node[0] >> v.x;
   node[1] >> v.y;
   node[2] >> v.z;
}

void operator >> (const YAML::Node& node, Power& power) {
   node["name"] >> power.name;
   node["damage"] >> power.damage;
}

void operator >> (const YAML::Node& node, Monster& monster) {
   node["name"] >> monster.name;
   node["position"] >> monster.position;
   const YAML::Node& powers = node["powers"];
   for(unsigned i=0;i<powers.size();i++) {
      Power power;
      powers[i] >> power;
      monster.powers.push_back(power);
   }
}

这里是sudo make install我运行make命令后输出的转储:

[ 81%] Built target yaml-cpp
[ 96%] Built target run-tests
[100%] Built target parse
Install the project...
-- Install configuration:      "Release"                                                                                                                                              
-- Installing: /usr/local/lib/libyaml-cpp.so.0.2.6
-- Up-to-date: /usr/local/lib/libyaml-cpp.so.0.2
-- Up-to-date: /usr/local/lib/libyaml-cpp.so
-- Up-to-date: /usr/local/include/yaml-cpp/aliasmanager.h
-- Up-to-date: /usr/local/include/yaml-cpp/anchor.h
-- Up-to-date: /usr/local/include/yaml-cpp/conversion.h
-- Up-to-date: /usr/local/include/yaml-cpp/dll.h
-- Up-to-date: /usr/local/include/yaml-cpp/emitfromevents.h
-- Up-to-date: /usr/local/include/yaml-cpp/emitter.h
-- Up-to-date: /usr/local/include/yaml-cpp/emittermanip.h
-- Up-to-date: /usr/local/include/yaml-cpp/eventhandler.h
-- Up-to-date: /usr/local/include/yaml-cpp/exceptions.h
-- Up-to-date: /usr/local/include/yaml-cpp/iterator.h
-- Up-to-date: /usr/local/include/yaml-cpp/ltnode.h
-- Up-to-date: /usr/local/include/yaml-cpp/mark.h
-- Up-to-date: /usr/local/include/yaml-cpp/node.h
-- Up-to-date: /usr/local/include/yaml-cpp/nodeimpl.h
-- Up-to-date: /usr/local/include/yaml-cpp/nodereadimpl.h
-- Up-to-date: /usr/local/include/yaml-cpp/nodeutil.h
-- Up-to-date: /usr/local/include/yaml-cpp/noncopyable.h
-- Up-to-date: /usr/local/include/yaml-cpp/null.h
-- Up-to-date: /usr/local/include/yaml-cpp/ostream.h
-- Up-to-date: /usr/local/include/yaml-cpp/parser.h
-- Up-to-date: /usr/local/include/yaml-cpp/stlemitter.h
-- Up-to-date: /usr/local/include/yaml-cpp/stlnode.h
-- Up-to-date: /usr/local/include/yaml-cpp/traits.h
-- Up-to-date: /usr/local/include/yaml-cpp/yaml.h
-- Up-to-date: /usr/local/include/yaml-cpp/anchordict.h
-- Up-to-date: /usr/local/include/yaml-cpp/graphbuilder.h
-- Installing: /usr/local/lib/pkgconfig/yaml-cpp.pc

可能有一些特殊的指令/选项,我必须gcc在使用libyaml编译时附加到命令？类似的东西gcc main.cpp -libyaml？

要获得编译器(gcc version 4.5.0 20100604 [gcc-4_5-branch revision 160292] (SUSE Linux))的更多输出:

/tmp/ccYltArL.o: In function `operator>>(YAML::Node const&, Monster&)':
main.cpp:(.text+0x1a8): undefined reference to `YAML::Node::size() const'
/tmp/ccYltArL.o: In function `main':
main.cpp:(.text+0x1fe): undefined reference to `std::basic_ifstream<char,      std::char_traits<char> >::basic_ifstream(char const*, std::_Ios_Openmode)'
main.cpp:(.text+0x215): undefined reference to   `YAML::Parser::Parser(std::basic_istream<char, std::char_traits<char> >&)'
main.cpp:(.text+0x224): undefined reference to `YAML::Node::Node()'
main.cpp:(.text+0x23e): undefined reference to    `YAML::Parser::GetNextDocument(YAML::Node&)'
main.cpp:(.text+0x29c): undefined reference to `std::cout'

还有比这里更适合的东西 ,最后以:

/tmp/ccYltArL.o:(.rodata._ZTIN4YAML14BadDereferenceE[typeinfo for YAML::BadDereference]+0x0): undefined reference to `vtable for    __cxxabiv1::__si_class_type_info'
/tmp/ccYltArL.o:(.rodata._ZTIN4YAML11KeyNotFoundE[typeinfo for YAML::KeyNotFound]+0x0): undefined reference to `vtable for  __cxxabiv1::__si_class_type_info'
/tmp/ccYltArL.o:(.rodata._ZTIN4YAML13InvalidScalarE[typeinfo for YAML::InvalidScalar]+0x0): more undefined references to `vtable for __cxxabiv1::__si_class_type_info' follow
/tmp/ccYltArL.o:(.rodata._ZTIN4YAML9ExceptionE[typeinfo for YAML::Exception]+0x8): undefined reference to `typeinfo for std::runtime_error'
/tmp/ccYltArL.o:(.eh_frame+0x18f): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

- 终于 -

解决了它与克里斯的解决方案(见下文),虽然我实际上找到了一种更加清晰的预加载'自定义'库的方法,通过使用ldconfig命令配置库搜索路径后我将我的库的路径添加到*.conf文件中/etc/ld.so.conf.d/.请参阅此处的详细指南...

Answer 1

没有指示gcc查看/ usr/local.你需要明确地做.而且,这应该是g ++而不是gcc.因此,首先要确保您的包含如下所示:

#include "yaml-cpp/yaml.h"

然后像这样编译:

g++ -I/usr/local/include -L/usr/local/lib -lyaml-cpp -o testprogram main.cpp