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Re: Bison 3.1 api.value.type {semantic_type} error in gcc8

From: Hans Åberg
Subject: Re: Bison 3.1 api.value.type {semantic_type} error in gcc8
Date: Tue, 16 Oct 2018 12:38:11 +0200

> On 16 Oct 2018, at 12:10, Akim Demaille <address@hidden> wrote:
> Hi Hans,


>> Le 16 oct. 2018 à 11:20, Hans Åberg <address@hidden> a écrit :
>> In Bison 3.1,
>> %define api.value.type {semantic_type}
>> produces an error in gcc8, though accepted in clang6, by the parser header 
>> typedef
>> #ifndef YYSTYPE
>>   /// Symbol semantic values.
>>   typedef semantic_type semantic_type;
>> #else
>>   typedef YYSTYPE semantic_type;
>> #endif
> Please, be more specific.  Provide an input file, and the complete error from 
> the compiler.

I just happened to discover it, so I do not know much about it yet. It may have 
to do with -std=c++17 on g++ 8.2.0, and I have a class semantic_type.

A workaround is to make the typedef'ed name qualified:
  typedef <namespace>::semantic_type semantic_type;

So if I change to
  %define api.value.type {<namespace>::semantic_type}
then it passes.

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