YACC(1)								       YACC(1)

NAME
       yacc - an LALR(1) parser generator

SYNOPSIS
       yacc [ -dlrtv ] [ -b file_prefix ] [ -p symbol_prefix ] filename

DESCRIPTION
       Yacc reads the grammar specification in the file filename and generates
       an LR(1) parser for it.	The parsers consist of a set of LALR(1)	 pars‐
       ing  tables and a driver routine written in the C programming language.
       Yacc normally writes the parse tables and the  driver  routine  to  the
       file y.tab.c.

       The following options are available:

	      -b file_prefix
		     The  -b option changes the prefix prepended to the output
		     file names to the string  denoted	by  file_prefix.   The
		     default prefix is the character y.

	      -d     The  -d option causes the header file y.tab.h to be writ‐
		     ten.

	      -l     If the -l option is not specified, yacc will insert #line
		     directives	 in  the generated code.  The #line directives
		     let the C compiler relate errors in the generated code to
		     the user's original code.	If the -l option is specified,
		     yacc will not insert the  #line  directives.   Any	 #line
		     directives specified by the user will be retained.

	      -p symbol_prefix
		     The -p option changes the prefix prepended to yacc-gener‐
		     ated symbols to the string denoted by symbol_prefix.  The
		     default prefix is the string yy.

	      -r     The  -r  option causes yacc to produce separate files for
		     code and tables.  The code file is	 named	y.code.c,  and
		     the tables file is named y.tab.c.

	      -t     The  -t option changes the preprocessor directives gener‐
		     ated by yacc so that debugging statements will be	incor‐
		     porated in the compiled code.

	      -v     The  -v option causes a human-readable description of the
		     generated parser to be written to the file y.output.

       If the environment variable TMPDIR is set, the string denoted by TMPDIR
       will be used as the name of the directory where the temporary files are
       created.

FILES
       y.code.c
       y.tab.c
       y.tab.h
       y.output
       /tmp/yacc.aXXXXXX
       /tmp/yacc.tXXXXXX
       /tmp/yacc.uXXXXXX

DIAGNOSTICS
       If there are rules that are never reduced, the number of such rules  is
       reported	 on  standard  error.  If there are any LALR(1) conflicts, the
       number of conflicts is reported on standard error.

4.3 Berkeley Distribution	 May 24, 1993			       YACC(1)

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