问题描述
我正在尝试安装。我已经安装了依赖项，并且 ./ autogen.sh 工作正常。但是，当我使用 make 编译时，出现下面的错误。
I'm trying to install the MIT Language Modeling Toolkit. I've installed the dependencies, and ./autogen.sh works fine. However, when I compile with make, I get the error below. I am running OSX 10.10.3.
Undefined symbols for architecture x86_64:
"std::__detail::_Prime_rehash_policy::_M_need_rehash(unsigned long, unsigned long, unsigned long) const", referenced from:
std::_Hashtable<unsigned long, std::pair<unsigned long const, int>, std::allocator<std::pair<unsigned long const, int> >, std::__detail::_Select1st, std::equal_to<unsigned long>, std::hash<unsigned long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_insert_unique_node(unsigned long, unsigned long, std::__detail::_Hash_node<std::pair<unsigned long const, int>, false>*) in evaluate-ngram.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make[1]: *** [evaluate-ngram] Error 1
make: *** [all-recursive] Error 1
推荐答案
使用C ++ 11？
Is it possible that the library uses C++11?
您必须添加以下编译器标志：
You'll have to add the following compiler flags:
-std=c++11 -stdlib=libc++
Mac OSX附带两个版本的标准库，较旧的 libstdc ++ 和较新的 libc ++ 。后者只支持C ++ 11。更多详细信息可以在中找到。
Mac OSX comes with two versions of the Standard Library, the older libstdc++ and the newer libc++. C++11 is only supported by the latter. More details can be found in this answer.
编辑：
根据，让您的构建系统知道您对编译器标志的更改，请尝试以下操作：
According to this source, to make your build system aware of your changes to the compiler flags, try the following:
$ export CXXFLAGS="-std=c++11 -stdlib=libc++"
$ export CC=`which clang` # optional step to make sure clang is being used
$ export CXX=`which clang++` # optional step to make sure clang is being used
$ ./autogen.sh
$ make
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