旧项目在xcode10遇到的问题

1、 Multiple commands produce

Multiple commands produce '/

方案一

修改 Xcode 的配置暂时解决了编译报错的问题。

Xcode -> File -> Workspace settings -> Build System ，选择 Legacy Build System 。

方案二

1. 选择打开所在的项目 Target -> Build Phases -> Copy Bundle Resources

2. 删除报错的那些文件

2. library not found for -lstdc++.6.0.9

Xcode10不支持 libstdc++ 系列的库了、需要删掉并且换成 libc++ 系列的库。有些第三方由于没有更新，会牵扯到这个库，所以运行后报错。

方案一

打开 Build Phases -> Link Binary With Libraries ，删除 lstdc++.6.0.9 依赖

有可能还有删除 Build Setting -> Other Linker Flags 里的 -l"stdc++.6.0.9"

但是现在部分第三方SDK依旧要依赖于 lstdc++.6.0.9.tbd 动态库，如果对代码进行改动或者修改 Xcode 的配置，可能会造成其他问题，例如在Xcode9.4上再次运行的时候可能会出现报错等等。

方案二

最简单解决该问题的方法就是从 Xcode9.4 中找到动态库 lstdc++.6.0.9.tbd 、 libstdc++.6.tbd 、 libstdc++.tbd 文件复制到 Xcode10 下就可以完美解决问题。

• 真机

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/

• 模拟器

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/

libstdc++文件下载链接

3. ld: symbol(s) not found for architecture x86_64

前面两个问题解决后，就遇到了这个问题，目前，用xcode10 在iOS12模拟器运行的时候会报这个错误，用iOS11模拟器试过也不行，而使用真机运行的话没有问题。

Undefined symbols for architecture x86_64:
  "std::basic_string<char, std::char_traits, std::allocator>::basic_string(char const*, std::allocatorconst&)", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::string::assign(std::string const&)", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::basic_fstream<char, std::char_traits>::open(char const*, std::_Ios_Openmode)", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::basic_fstream<char, std::char_traits>::close()", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::string::_Rep::_S_empty_rep_storage", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::ios_base::Init::~Init()", referenced from:
      __GLOBAL__sub_I_BVMDOfflineMapMerge.cpp in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::basic_fstream<char, std::char_traits>::~basic_fstream()", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::string::_Rep::_M_destroy(std::allocatorconst&)", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::ostream::tellp()", referenced from:
      _baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::ostream::write(char const*, long)", referenced from:
      _baidu_framework::MergeNamePart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::istream::seekg(long long, std::_Ios_Seekdir)", referenced from:
      _baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::ios_base::Init::Init()", referenced from:
      __GLOBAL__sub_I_BVMDOfflineMapMerge.cpp in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::basic_fstream<char, std::char_traits>::basic_fstream()", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::istream::tellg()", referenced from:
      _baidu_framework::MergeNamePart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::__throw_length_error(char const*)", referenced from:
      std::vector<_baidu_vi::CVPtrRef, std::allocator<_baidu_vi::CVPtrRef> >::_M_fill_insert(__gnu_cxx::__normal_iterator<_baidu_vi::CVPtrRef*, std::vector<_baidu_vi::CVPtrRef, std::allocator<_baidu_vi::CVPtrRef> > >, unsigned long, _baidu_vi::CVPtrRefconst&) in BaiduMapAPI_Map(TextureDataLoader.o)
  "std::istream::read(char*, long)", referenced from:
      _baidu_framework::MergeNamePart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, std::basic_fstream<char, std::char_traits>&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits>&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
  "std::basic_filebuf<char, std::char_traits>::is_open() const", referenced from:
      _baidu_framework::HandleBasemapMerge(_baidu_vi::CVString const&, _baidu_vi::CVString const&, _baidu_vi::CVString const&, char const*) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)