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BISON(1)							      BISON(1)



NAME
       bison - GNU Project parser generator (yacc replacement)

SYNOPSIS
       bison  [	 -b  file-prefix  ]  [	--file-prefix=file-prefix  ]  [ -d ] [
       --defines=defines-file ] [ -g  ]	 [  --graph=graph-file	]  [  -k  ]  [
       --token-table  ] [ -l ] [ --no-lines ] [ -n ] [ --no-parser ] [ -o out-
       file ] [ --output-file=outfile ] [ -p prefix ] [ --name-prefix=prefix ]
       [  -t  ] [ --debug ] [ -v ] [ --verbose ] [ -V ] [ --version ] [ -y ] [
       --yacc ] [ -h ] [ --help ] [ --fixed-output-files ] file
       yacc [ similar options and operands ]

DESCRIPTION
       Bison is a parser generator in the style	 of  yacc(1).	It  should  be
       upwardly compatible with input files designed for yacc.

       Input  files should follow the yacc convention of ending in .y.	Unlike
       yacc, the generated files do not have fixed names, but instead use  the
       prefix of the input file.  Moreover, if you need to put C++ code in the
       input file, you can end his name	 by  a	C++-like  extension  (.ypp  or
       .y++),  then  bison  will follow your extension to name the output file
       (.cpp or	 .c++).	  For  instance,  a  grammar  description  file	 named
       parse.yxx   would   produce  the	 generated  parser  in	a  file	 named
       parse.tab.cxx,  instead	of  yacc's  y.tab.c  or	 old  Bison  version's
       parse.tab.c.

       This  description  of the options that can be given to bison is adapted
       from the node Invocation in the bison.texinfo manual, which  should  be
       taken as authoritative.

       Bison supports both traditional single-letter options and mnemonic long
       option names.  Long option names are indicated with --  instead	of  -.
       Abbreviations  for option names are allowed as long as they are unique.
       When a long option takes an argument, like --file-prefix,  connect  the
       option name and the argument with =.

   OPTIONS
       -b file-prefix
       --file-prefix=file-prefix
	      Specify  a  prefix  to use for all bison output file names.  The
	      names are chosen as if the input file were named	file-prefix.c.

       -d
	      Write  an extra output file containing macro definitions for the
	      token type names defined in the grammar and the  semantic	 value
	      type YYSTYPE, as well as a few extern variable declarations.

	      If  the  parser  output  file  is named name.c then this file is
	      named name.h.

	      This output file is essential if you wish to put the  definition
	      of  yylex	 in  a separate source file, because yylex needs to be
	      able to refer to token type codes and the variable yylval.

       --defines=defines-file
	      The behavior of --defines is the same than -d option.  The  only
	      difference is that it has an optional argument which is the name
	      of the output filename.

       -g
	      Output a VCG definition of the LALR(1)  grammar  automaton  com-
	      puted  by	 Bison.	 If the grammar file is foo.y , the VCG output
	      file will be foo.vcg.

       --graph=graph-file
	      The behavior of --graph is the same than -g  option.   The  only
	      difference is that it has an optional argument which is the name
	      of the output graph filename.

       -k
       --token-table
	      This switch causes the name.tab.c output to include  a  list  of
	      token  names in order by their token numbers; this is defined in
	      the array yytname.  Also generated are #defines  for  YYNTOKENS,
	      YYNNTS, YYNRULES, and YYNSTATES.

       -l
       --no-lines
	      Don't  put  any  #line preprocessor commands in the parser file.
	      Ordinarily bison puts them in the parser file so that the C com-
	      piler and debuggers will associate errors with your source file,
	      the grammar file.	 This option causes them to  associate	errors
	      with  the parser file, treating it an independent source file in
	      its own right.

       -n
       --no-parser
	      Do not generate the parser code into the output;	generate  only
	      declarations.  The generated name.tab.c file will have only con-
	      stant declarations.  In addition, a name.act file	 is  generated
	      containing a switch statement body containing all the translated
	      actions.

       -o outfile
       --output-file=outfile
	      Specify the name outfile for the parser file.

	      The other output files' names are constructed  from  outfile  as
	      described under the -v and -d switches.

       -p prefix
       --name-prefix=prefix
	      Rename  the  external  symbols  used  in the parser so that they
	      start with prefix instead of yy.	The precise  list  of  symbols
	      renamed is yyparse, yylex, yyerror, yylval, yychar, and yydebug.

	      For example, if you use -p c, the names become cparse, clex, and
	      so on.

       -t
       --debug
	      In  the  parser file, define the macro YYDEBUG to 1 if it is not
	      already defined, so that the debugging facilities are  compiled.

       -v
       --verbose
	      Write  an	 extra	output file containing verbose descriptions of
	      the parser states and what is done for each type	of  look-ahead
	      token in that state.

	      This  file also describes all the conflicts, both those resolved
	      by operator precedence and the unresolved ones.

	      The file's name is made by removing .tab.c or .c from the parser
	      output file name, and adding .output instead.

	      Therefore,  if  the input file is foo.y, then the parser file is
	      called foo.tab.c by default.   As	 a  consequence,  the  verbose
	      output file is called foo.output.

       -V
       --version
	      Print the version number of bison and exit.

       -h
       --help Print a summary of the options to bison and exit.

       -y
       --yacc
       --fixed-output-files
	      Equivalent  to  -o  y.tab.c;  the	 parser	 output file is called
	      y.tab.c, and the other outputs are called y.output and  y.tab.h.
	      The purpose of this switch is to imitate yacc's output file name
	      conventions.  Thus, the following shell  script  can  substitute
	      for yacc and is often installed as yacc:

	      bison -y "$@"


SEE ALSO
       yacc(1)
       The  Bison  Reference Manual, included as the file bison.texinfo in the
       bison source distribution.

DIAGNOSTICS
       Self explanatory.



				     local			      BISON(1)
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