[cfe-dev] Help with Command-Line Validation

[Uri Mann via cfe-dev]

Hi Dave;

I'm using VS2013 to compile the code. Here's the output when the additional methods are not added:

// CommonFrontendAction.h
struct ProjectParser : public llvm::cl::basic_parser<std::string> {
    //ProjectParser(__in llvm::cl::opt<std::string, false, ProjectParser>& Option);
    //ProjectParser& operator=(const ProjectParser&) = delete;

    typedef std::string parser_data_type;
    typedef llvm::cl::OptionValue<std::string> OptVal;

    // parse - Return true on error.
    bool parse(__in llvm::cl::Option& option,
               __in llvm::StringRef argName,
               __in const std::string& argValue,
               __in std::string& project);
    // Needed to for CLANG 3.7.0
    //operator llvm::cl::parser<std::string>&(void) const;
};

1>  CommonFrontendAction.cpp
1>c:\<my_path>\CommonFrontendAction.h(97): warning C4510: 'ProjectParser' : default constructor could not be generated
1>          c:\<my_path>\CommonFrontendAction.h(83) : see declaration of 'ProjectParser'
1>c:\<my_path>\CommonFrontendAction.h(97): warning C4610: struct 'ProjectParser' can never be instantiated - user defined constructor required
1>C:\<llvm_path>\llvm\include\llvm/Support/CommandLine.h(1251): error C2664: 'ProjectParser::ProjectParser(const ProjectParser &)' : cannot convert argument 1 from 'llvm::cl::opt<std::string,false,ProjectParser>' to 'const ProjectParser &'
1>          Reason: cannot convert from 'llvm::cl::opt<std::string,false,ProjectParser>' to 'const ProjectParser'
1>          No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1>          C:\<my_path>\CommonFrontendAction.cpp(143) : see reference to function template instantiation 'llvm::cl::opt<std::string,false,ProjectParser>::opt<const char[8],llvm::cl::desc,llvm::cl::NumOccurrencesFlag,llvm::cl::cat>(const char (&)[8],const llvm::cl::desc &,const llvm::cl::NumOccurrencesFlag &,const llvm::cl::cat &)' being compiled
1>          C:\<my_path>\CommonFrontendAction.cpp(143) : see reference to function template instantiation 'llvm::cl::opt<std::string,false,ProjectParser>::opt<const char[8],llvm::cl::desc,llvm::cl::NumOccurrencesFlag,llvm::cl::cat>(const char (&)[8],const llvm::cl::desc &,const llvm::cl::NumOccurrencesFlag &,const llvm::cl::cat &)' being compiled
1>C:\<llvm_path>\llvm\include\llvm/Support/CommandLine.h(1026): error C2664: 'void llvm::cl::OptionDiffPrinter<std::basic_string<char,std::char_traits<char>,std::allocator<char>>,ValDT>::print(const llvm::cl::Option &,const llvm::cl::parser<std::string> &,const DT &,const llvm::cl::OptionValue<std::string> &,size_t)' : cannot convert argument 2 from 'const ProjectParser' to 'const llvm::cl::parser<std::string> &'
1>          with
1>          [
1>              ValDT=std::string
1>  ,            DT=std::basic_string<char,std::char_traits<char>,std::allocator<char>>
1>          ]
1>          Reason: cannot convert from 'const ProjectParser' to 'const llvm::cl::parser<std::string>'
1>          No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1>          C:\<llvm_path>\llvm\include\llvm/Support/CommandLine.h(1225) : see reference to function template instantiation 'void llvm::cl::printOptionDiff<ParserClass,DataType>(const llvm::cl::Option &,const llvm::cl::basic_parser<DataType> &,const ValDT &,const llvm::cl::OptionValue<std::string> &,size_t)' being compiled
1>          with
1>          [
1>              ParserClass=ProjectParser
1>  ,            DataType=std::string
1>  ,            ValDT=std::string
1>          ]
1>          C:\<llvm_path>\llvm\include\llvm/Support/CommandLine.h(1222) : while compiling class template member function 'void llvm::cl::opt<std::string,false,ProjectParser>::printOptionValue(size_t,bool) const'
1>          c:\<my_path>\CommonFrontendAction.h(108) : see reference to class template instantiation 'llvm::cl::opt<std::string,false,ProjectParser>' being compiled
1>
1>Build FAILED.

If you're using a different compiler your mileage may differ.
Best,
-Uri