mavericks / xcode5.0.1如何更改编译器和链接器？ [英] How mavericks/xcode5.0.1 changed the compiler and linker?

问题描述

我将系统从10.8升级到10.9，相应地将xcode从5.0升级到5.0.1。

I upgraded a system from 10.8 to 10.9 and correspondingly for xcode from 5.0 to 5.0.1.

当我尝试运行我的一部分构建将多个.a文件合并为一个更大的共享库：

I'm rewarded when I try to run a part of my build that combines multiple .a files into a single, larger, shared lib:

Undefined symbols for architecture x86_64:
"__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm", referenced from:             
__ZN2bt3fst12FstLookupSet14loadFromStringERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEESA_ in libbtfst.a(bt_fst_factory.o)

过滤的问题符号是：

__ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE13find_first_ofEPKcmm
std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::find_first_of(char const*, unsigned long, unsigned long) const

链接命令行看起来像：

libtool -macosx_version_min 10.6  -headerpad_max_install_names -dynamic -multiply_defined suppress -install_name `basename ../../../../rlp/lib/amd64-darwin12-xcode5/libbtutils.dylib` -o ../../../../rlp/lib/amd64-darwin12-xcode5/libbtutils.dylib -g   <long list of .a files>  -lstdc++.6 -lSystem

推荐答案

使用较新的libc ++编译了一些对象，这在10.6中不被支持，并且与您在链接过程中使用的库相矛盾。

It looks like you've compiled some of the objects using the newer libc++, which isn't supported under 10.6, and contradicts the library you are using during linking.

您可以指定库在编译期间使用 -stdlib = libstdc ++ ，还需要确保指定 -mmacosx-version-min = 10.6 在编译期间，这可能有相同的效果，但显式声明部署目标。

You can specify the library to use during a compile using -stdlib=libstdc++ and you also need to ensure you specify -mmacosx-version-min=10.6 during compilation, which might have the same effect, but explicitly declares the deployment target.

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