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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 `='.
Here is a list of options that can be used with Bison, alphabetized
by short option. It is followed by a cross key alphabetized by long
Specify a prefix to use for all Bison output file names. The
names are chosen as if the input file were named `PREFIX.c'.
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
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'.
Note: Semantic Values of Tokens.
Don't put any `#line' preprocessor commands in the parser file.
Ordinarily Bison puts them in the parser file so that the C
compiler 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.
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.
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.
Note: Multiple Parsers in the Same Program.
Output a definition of the macro `YYDEBUG' into the parser file,
so that the debugging facilities are compiled. Note: Debugging
Write an extra output file containing verbose descriptions of the
parser states and what is done for each type of look-ahead token in
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'.
Print the version number of Bison and exit.
Print a summary of the command-line options to Bison and exit.
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:
bison -y $*
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