升级到 Mac OS X 10.9 / Xcode 5.0.1 后 C++ 链接错误
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C++ linking error after upgrading to Mac OS X 10.9 / Xcode 5.0.1
提问by FabienRohrer
After upgrading to Mac OS X 10.9 / Xcode 5.0.1, command lines to create a shared library (.dylib) failed with several undefined symbols.
升级到 Mac OS X 10.9 / Xcode 5.0.1 后，创建共享库 (.dylib) 的命令行失败并显示多个未定义符号。
clang++ -dynamiclib -install_name test.dylib *.o -o test.dylib
Undefined symbols for architecture x86_64:
"std::allocator<char>::allocator()", referenced from:
_main in test.o
"std::allocator<char>::~allocator()", referenced from:
_main in test.o
"std::ostream::operator<<(std::ostream& (*)(std::ostream&))", referenced from:
_main in test.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)", referenced from:
_main in test.o
"std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()", referenced from:
_main in test.o
"std::ios_base::Init::Init()", referenced from:
___cxx_global_var_init in test.o
"std::ios_base::Init::~Init()", referenced from:
___cxx_global_var_init in test.o
"std::cout", referenced from:
_main in test.o
"std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)", referenced from:
_main in test.o
"std::basic_ostream<char, std::char_traits<char> >& std::operator<<<char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)", referenced from:
_main in test.o
ld: symbol(s) not found for architecture x86_64
回答by FabienRohrer
The answer is there: https://mathematica.stackexchange.com/questions/34692/mathlink-linking-error-after-os-x-10-9-mavericks-upgrade
答案就在那里：https: //mathematica.stackexchange.com/questions/34692/mathlink-linking-error-after-os-x-10-9-mavericks-upgrade
There are two implementations of the standard C++ library available on OS X: libstdc++ and libc++. They are not binary compatible and libMLi3 requires libstdc++.
On 10.8 and earlier libstdc++ is chosen by default, on 10.9 libc++ is chosen by default. To ensure compatibility with libMLi3, we need to choose libstdc++ manually.
To do this, add -stdlib=libstdc++ to the linking command.
OS X 上有两种标准 C++ 库的实现：libstdc++ 和 libc++。它们不是二进制兼容的，并且 libMLi3 需要 libstdc++。
在 10.8 及更早版本上默认选择 libstdc++，在 10.9 上默认选择 libc++。为了保证与libMLi3的兼容性，我们需要手动选择libstdc++。
为此，请将 -stdlib=libstdc++ 添加到链接命令中。
Related post: Compiling with Clang using Libc++ undefined references
相关文章：使用 Libc++ 未定义引用使用 Clang 进行编译
Edit: After some investigations it seems there is a link between the -mmacosx-version-minand the choice of the default libstd. If min version < 10.9, then the default libstdis equal to libstdc++, else to libc++. The long term solution is clearly to use -stdlib=libc++
编辑：经过一些调查，似乎在-mmacosx-version-min和 默认选择之间存在联系libstd。如果最小版本 < 10.9，则默认libstd值等于libstdc++，否则等于libc++。长期解决方案显然是使用-stdlib=libc++
回答by Omer Cansizoglu
Those suggestions did not work for me with Mac El capitan. If you have similar issues after upgrading to El Capitan, just run
这些建议对我来说对 Mac El capan 不起作用。如果您在升级到 El Capitan 后遇到类似问题，请运行
xcode-select --install
before trying to compile
在尝试编译之前
