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
- 选择打开所在的项目
Target->Build Phases->Copy Bundle Resources - 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/
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<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> 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::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<char> >::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<char> >::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<char> >::~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::allocator<char> 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::ostream::tellp()", referenced from:
_baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, _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<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, _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<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits<char> >&) 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<char> >::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<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits<char> >&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
"std::__throw_length_error(char const*)", referenced from:
std::vector<_baidu_vi::CVPtrRef<_baidu_framework::CTextureData>, std::allocator<_baidu_vi::CVPtrRef<_baidu_framework::CTextureData> > >::_M_fill_insert(__gnu_cxx::__normal_iterator<_baidu_vi::CVPtrRef<_baidu_framework::CTextureData>*, std::vector<_baidu_vi::CVPtrRef<_baidu_framework::CTextureData>, std::allocator<_baidu_vi::CVPtrRef<_baidu_framework::CTextureData> > > >, unsigned long, _baidu_vi::CVPtrRef<_baidu_framework::CTextureData> const&) in BaiduMapAPI_Map(TextureDataLoader.o)
"std::istream::read(char*, long)", referenced from:
_baidu_framework::MergeNamePart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeIndexPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::MergeDataPart(std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, std::basic_fstream<char, std::char_traits<char> >&, _baidu_framework::tagVectorMapFile&, int) in BaiduMapAPI_Map(BVMDOfflineMapMerge.o)
_baidu_framework::CheckPatchMd5(std::basic_fstream<char, std::char_traits<char> >&) 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<char> >::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)
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