xcode – 来自链接器(ld)的奇怪警告

该应用程序正常工作，但广告编译时我们总是得到这些奇怪的链接器警告：

ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhonenumberUtilEE8instanceE means the weak symbol cAnnot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility setTings.
ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhonenumberUtilEE8instanceE means the weak symbol cAnnot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility setTings.
ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZN5boost10scoped_ptrIN4i18n12phonenumbers15PhonenumberUtilEED1Ev means the weak symbol cAnnot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility setTings.
ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZN4i18n12phonenumbers9SingletonINS0_15PhonenumberUtilEE8instanceE means the weak symbol cAnnot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility setTings.
ld: warning: direct access in ___cxx_global_var_init17 to global weak symbol __ZGVN4i18n12phonenumbers9SingletonINS0_15PhonenumberUtilEE8instanceE means the weak symbol cAnnot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility setTings.

这来自一个C/C++库。我们正在与这些库链接：

> libphonenumber，这是导致5个警告中的4个的显然。由我们通过“cmake”编译。
boost(libboost_thread-mt)，负责1警告。与MacPorts编译。
>使用MacPorts编译的ICU(libicudata，libicuuc，libicui18n)。
> Protocol Buffers，通过“./configure&& make”编译。

请注意：

>尽管有警告，应用程序仍然运行正常，但我们希望能够摆脱这些问题，因为它们令人讨厌。
> xcode with boost : linker(Id) Warning about visibility settings提出的解决方案不起作用：“默认隐藏的符号”一直是“是”。