.\"	%W%	%R% (Berkeley) %E%.\".TH YACC 1 "July\ 15,\ 1990".UC 6.SH NAMEYacc \- an LALR(1) parser generator.SH SYNOPSIS.B yacc [ -dlrtv ] [ -b.I prefix.B ] [ -S.I skeleton file.B ].I filename.SH DESCRIPTION.I Yaccreads the grammar specification in the file.I filenameand generates an LR(1) parser for it.The parsers consist of a set of LALR(1) parsing tables and a driver routinewritten in the C programming language..I Yaccnormally writes the parse tables and the driver routine to the file.IR y.tab.c..PPThe following options are available:.RS.TP\fB-b \fIprefix\fRThe.B -boption changes the prefix prepended to the output file names tothe string denoted by.IR prefix.The default prefix is derived from the input filename..TP.B -dThe \fB-d\fR option causes the header file.IR y.tab.hto be written..TP.B -lIf the.B -loption is not specified,.I yaccwill insert \fB#line\fR directives in the generated code.The \fB#line\fR directives let the C compiler relate errors in thegenerated code to the user's original code.If the \fB-l\fR option is specified,.I yaccwill not insert the \fB#line\fR directives.\fB#line\fR directives specified by the user will be retained..TP.B -rThe.B -roption causes.I yaccto produce separate files for code and tables.  The code fileis named.IR y.code.c,and the tables file is named.IR y.tab.c..TP.B -tThe.B -toption changes the preprocessor directives generated by.I yaccso that debugging statements will be incorporated in the compiled code..TP.B -vThe.B -voption causes a human-readable description of the generated parser tobe written to the file.IR y.output..TP\fB-S \fIskeleton file\fRThe \fB-S\fR option causes a different skeleton file to be used.  Thedefault skeleton file is built in to \fIyacc\fR when it is built..RE.PPIf the environment variable TMPDIR is set, the string denoted byTMPDIR will be used as the name of the directory where the temporaryfiles are created..SH FILES.IR filename\fB.code.c.br.IR filename\fB.tab.c.br.IR filename\fB.tab.h.br.IR filename\fB.output.br.BR /tmp/yacc.aXXXXXX.br.BR /tmp/yacc.tXXXXXX.br.BR /tmp/yacc.uXXXXXX.SH DIAGNOSTICSIf there are rules that are never reduced, the number of such rules isreported on standard error.If there are any LALR(1) conflicts, the number of conflicts is reportedon standard error.