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POHow to use yaml-cpp in a C++ program on Linux?
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2011-04-17T13:09:29.653
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I have recently decided to use yaml as my configuration file technology, and am writing a c++ linux application on OpenSuse 11.3. The problem is that even after successfully installing cmake, compilling yaml-cpp as shown on the yaml-cpp docs page, I still can't compile the simple demo programs on the yaml-cpp page <a href="http://code.google.com/p/yaml-cpp/wiki/HowToParseADocument" rel="nofollow">here</a>. For example, when I try to compile the the <a href="http://code.google.com/p/yaml-cpp/wiki/HowToParseADocument#A_Complete_Example" rel="nofollow">monster.yaml and main.cpp example</a> my compiler on issuing the command <code>gcc main.cpp</code>, it issues the following errors: <blockquote> main.cpp:24:25: error: ‘YAML’ does not name a type main.cpp:24:35: error: expected unqualified-id before ‘&’ token main.cpp:24:35: error: expected ‘)’ before ‘&’ token main.cpp:24:35: error: expected initializer before ‘&’ token main.cpp:30:25: error: ‘YAML’ does not name a type main.cpp:30:35: error: expected unqualified-id before ‘&’ token main.cpp:30:35: error: expected ‘)’ before ‘&’ token main.cpp:30:35: error: expected initializer before ‘&’ token main.cpp:35:25: error: ‘YAML’ does not name a type main.cpp:35:35: error: expected unqualified-id before ‘&’ token main.cpp:35:35: error: expected ‘)’ before ‘&’ token main.cpp:35:35: error: expected initializer before ‘&’ token </blockquote> I tried changing the include directive from <code>#include "yaml-cpp/yaml.h"</code> to <code>#include <yaml.h></code>, since I'd installed the yaml lib, but this didn't solve anything. so what did I do wrong? Here is the problematic code pasted from lines 24 to 40: <pre><code>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); } } </code></pre> And here is a dump of the output of the <code>sudo make install</code> after I run the <code>make</code> command: <pre><code>[ 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 </code></pre> Could there probably be some special directive / option that I have to append to the <code>gcc</code> command when compiling with libyaml? something like <code>gcc main.cpp -libyaml</code> ? For more output from the compiler (<code>gcc version 4.5.0 20100604 [gcc-4_5-branch revision 160292] (SUSE Linux)</code>) : <pre><code>/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' </code></pre> and much more stuff than can fit here , finally ending in: <pre><code>/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 </code></pre> -- finally -- Solved it with Chris's soln (see below), though I actually found an even cleaner way of pre-loading 'custom' libraries, by using the <code>ldconfig</code> command to configure the library search path after i add the path to my libs into a <code>*.conf</code> file in <code>/etc/ld.so.conf.d/</code>. See the <a href="http://www.cyberciti.biz/faq/linux-setting-changing-library-path/" rel="nofollow">detailed guide here...</a>
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How to use yaml-cpp in a C++ program on Linux?
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