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Re: [-Wconversion] on "*yyssp = yystate;"

From: Akim Demaille
Subject: Re: [-Wconversion] on "*yyssp = yystate;"
Date: Tue, 11 Aug 2015 14:09:56 +0200

> Le 6 août 2015 à 20:03, Ulya Fokanova <address@hidden> a écrit :
> Hello!
> I get the following warning compling bison-3.0.4 generated parser with GCC:
>   warning: conversion to ‘yytype_int16 {aka short int}’ from ‘int’ may
>   alter its value [-Wconversion]
>       *yyssp = yystate;
> As I understand, yyssp has to be 16-bit in order to reduce stack space. If 
> this conversion is safe, bison could generate explicit cast; otherwise a more 
> serious fix is needed. Could you fix it, or perhaps you'd like me to try send 
> a patch ? Should I provide an example?

Hi Ulya,

Bison tries to use the smallest possible size of int for the tables.  But I 
guess yystate does not use the same type.  However, it's safe.

If you can work out a patch (I'd avoid the cast though), that would be fine!  
Otherwise, I'll probably address this at some point.


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