对YAML :: LoadFile的未定义引用 [英] undefined reference to YAML::LoadFile

问题描述

我正在尝试使用新版本的libyaml-cpp并出现链接器问题(undefined reference to 'YAML::LoadFile(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)').

I'm trying to use the new version of libyaml-cpp and having linker problems (undefined reference to 'YAML::LoadFile(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)').

我按如下方式构建该库:

I build the library as follows:

cmake -DBUILD_SHARED_LIBS=ON ..
make
sudo make install

然后我包含yaml-cpp/yaml.h并致电YAML::LoadFile( some_string );.我的编译行是:

Then I include yaml-cpp/yaml.h and call YAML::LoadFile( some_string );. My compilation line is:

g++ -L/usr/local/lib -I/usr/local/include -lyaml-cpp -std=c++0x -o $@  $^

我也尝试将确切的.so文件放入其中，但是没有运气.使用nm，我可以在共享库中看到一个LoadFile函数.我现在不知道是由于某种原因使用了错误的构建线，还是库有问题.

I've tried putting the exact .so file in there as well with no luck. Using nm I can see a LoadFile function in the shared library. I can't figure out now if I'm somehow using the wrong build line or there is something wrong with the library.

推荐答案

这是命令行上的排序问题.我想我永远也不会理解GCC命令行逻辑.只需将库放在末尾就可以了:

It's an ordering problem on the command-line. I guess I'll just never understand GCC command-line logic. Simply putting the library at the end seems to work:

g++ -L/usr/local/lib -I/usr/local/include -std=c++0x -o $@  $^ -lyaml-cpp

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