Re: glr2.cc compile errors under Windows

[Akim Demaille]

Jot,

> Le 20 nov. 2021 à 15:57, Jot Dot <jotdot@shaw.ca> a écrit :
> 
> Hi Akim,
> 
>> Could you please attach that parser.h file?  Or a link to it?  Or at least 
>> the
>> relevant excerpts, so that we can have a look at what confuses it.
>> 
>> Did you make sure it compiled in C++11?  Actually I would even make sure to 
>> be
>> in C++14 mode.
> 
> 1>D:\data\c\runtime\parser.h(246,1): error C2535: 
> 'yy::parser::basic_symbol<Base> &yy::parser::basic_symbol<Base>::operator 
> =(const yy::parser::basic_symbol<Base> &)': member function already defined 
> or declared
> 1>D:\data\c\runtime\parser.h(203): message : see declaration of 
> 'yy::parser::basic_symbol<Base>::operator ='
> 1>D:\data\c\runtime\parser.h(248): message : see reference to class template 
> instantiation 'yy::parser::basic_symbol<Base>' being compiled

   202        /// Copy assignment.
   203        basic_symbol& operator= (const basic_symbol& that)
   204        {
   205          Base::operator= (that);
   206          value = that.value;
   207          return *this;
   208        }

   243      private:
   244  #if YY_CPLUSPLUS < 201103L
   245        /// Assignment operator.
   246        basic_symbol& operator= (const basic_symbol& that);
   247  #endif

So your compiler is right, we do have a duplicate definition.  However it is 
not supposed to see the second one, because it should not be visible in C++17.

    53  #if defined __cplusplus
    54  # define YY_CPLUSPLUS __cplusplus
    55  #else
    56  # define YY_CPLUSPLUS 199711L
    57  #endif

Please check why your compiler does not define __cplusplus.  Compliant 
compilers must define it properly so that we can know what version of C++17 
we're in.  See 
https://en.cppreference.com/w/cpp/preprocessor/replace#Predefined_macros.

> 1>D:\data\c\runtime\parser.h(246,1): error C2535: 
> 'yy::parser::basic_symbol<yy::parser::by_kind> 
> &yy::parser::basic_symbol<yy::parser::by_kind>::operator =(const 
> yy::parser::basic_symbol<yy::parser::by_kind> &)': member function already 
> defined or declared
> 1>D:\data\c\runtime\parser.h(203): message : see declaration of 
> 'yy::parser::basic_symbol<yy::parser::by_kind>::operator ='
> 1>D:\data\c\runtime\parser.h(295): message : see reference to class template 
> instantiation 'yy::parser::basic_symbol<yy::parser::by_kind>' being compiled
> 1>D:\data\c\runtime\parser.y(7,15): error C2065: 'YYSTYPE': undeclared 
> identifier

Don't use YYSTYPE.  Use parser::value_type.

Cheers!