Mac中的Clang ++环境错误

Question

我使用mac和clang作为默认编译器。 有一天，有人不小心删除了我的一个库，导致我的环境崩溃了……现在，当我执行clang ++时，很多错误信息出现在我的终端上，说：

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:101:9: error:

          no member named 'div_t' in the global namespace
    using ::div_t;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:102:9: error:
          no member named 'ldiv_t' in the global namespace
    using ::ldiv_t;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:104:9: error:
          no member named 'lldiv_t' in the global namespace
    using ::lldiv_t;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:106:9: error:
          no member named 'atof' in the global namespace
    using ::atof;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:107:9: error:
          no member named 'atoi' in the global namespace
    using ::atoi;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstdlib:108:9: error:
          no member named 'atol' in the global namespace
    using ::atol;
          ~~^
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/`c++/v1/cstdlib:110:9: error:
          no member named 'atoll' in the global namespace
    using ::atoll;

总共有50个错误！ 我想问的是，是否可以在不重新安装系统的情况下恢复clang环境？ 我只是不确切知道这些功能在哪里...

Answer 1

尝试从“应用程序”文件夹中删除Xcode.app，清空垃圾桶，然后从App Store重新安装。