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。
问题是即使成功安装cmake,编译yaml-cpp如yaml-cpp docs页面所示,我仍然无法编译yaml-cpp页面here的简单演示程序。
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,它发出以下错误:
main.cpp:24:25: 错误: 'YAML' 没有命名类型
main.cpp:24:35: 错误: '&' 之前的预期 unqualified-id 令牌
main.cpp:24:35: 错误:在 '&' 之前需要 ')' 令牌
main.cpp:24:35:错误:“&”之前的预期初始化程序 令牌
main.cpp:30:25:错误:'YAML' 没有命名类型
main.cpp:30:35:错误:'&' 之前的预期 unqualified-id 令牌
main.cpp:30:35:错误:在 '&' 之前应为 ')' 令牌
main.cpp:30:35:错误:“&”之前的预期初始化程序 令牌
main.cpp:35:25:错误:'YAML' 没有命名类型
main.cpp:35:35:错误:'&' 之前的预期 unqualified-id 令牌
main.cpp:35:35:错误:在 '&' 之前应为 ')' 令牌
main.cpp:35:35:错误:“&”之前的预期初始化程序 令牌
我尝试将 include 指令从 更改#include "yaml-cpp/yaml.h"
为#include <yaml.h>
,因为我安装了 yaml 库,但这并没有解决任何问题。
所以我做错了什么?
这是从第 24 行到第 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
gcc
在使用 libyaml 进行编译时,是否可能有一些特殊的指令/选项必须附加到命令中?像gcc main.cpp -libyaml
什么?
有关编译器 ( 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'
还有更多的东西在这里放不下 ,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
- 最后 -
用 Chris 的解决方案(见下文)解决了这个问题,尽管我实际上找到了一种更简洁的预加载“自定义”库的方法,方法是在将ldconfig
库的路径添加到. 请参阅此处的详细指南...*.conf
/etc/ld.so.conf.d/