Re: Bison: Syntax error with german "umlaute"

[Paul Eggert]

> From: Wolfgang Gabriel <address@hidden>
> Date: 27 Jun 2002 23:51:00 -0700

> using Bison V1.25 (under HP-UX) I always get a "Syntax error"
> (function YYERROR will be called) if the parsed source code contains
> german umlaute

Most likely you are on a host with signed char, and your umlauted
character code has a negative value after it is converted to type
'char'.  When yylex returns a negative value, that is considered to be
end-of-input.

> How can I avoid this error?

yylex should return a negative value only on end-of-input.
Please try converting your German umlaut to 'unsigned char' instead.

Perhaps this issue should be documented in the Bison manual; it's a
bit obscure, I'm afraid.