Re: yacc.c fix to avoid use of uninitialized variables in initial action

[Akim Demaille]

Le 9 juil. 05 à 09:17, Paul Eggert a écrit :

> I installed this:
>
> 2005-07-09  Paul Eggert  <address@hidden>
>
>     * data/yacc.c (yyparse): In the initial action, set
>     yylsp[0] and yyvsp[0] rather than yylloc and yylval.
>     This avoids the use of undefined variables if the initial
>     action does not set yylloc and/or yylval.

But then yylloc is no longer initialized.  I usually initialized
it there, and then it is the scanner that updates it.  I really
meant to have the previous version.

And this value is not used, it is copied.  A tool such as Valgrind
makes the difference.