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Re: assert failure at line 1896

From: Paul Eggert
Subject: Re: assert failure at line 1896
Date: Mon, 29 May 2006 21:44:26 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

"Joel E. Denny" <address@hidden> writes:

> Searching for `#define' in the Open Group's yacc spec, I see no
> discussion of the yacc user ever specifying a #define.

You missed YYDEBUG.  Other than that, Posix doesn't say what happens
if the user #defines a macro beginning with YY -- the behavior is
undefined in that case, which is why Bison can depend on those
user-defined macros.

> So, macros should be only a Bison backward-compatibility issue, right?

If by that you mean "macros defined by the user whose names begin
with yy or YY", then I would demur for the following macros:


since Solaris 10 yacc generates a parser whose behavior also depend on
these user-defined macros, in a way that's compatible with Bison.
(For what it's worth, the Solaris 10 parser also depends on YYEXPAND,
YYNMBCHARS, yyerror, and yylex.)

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