1234949Sbapt     The -r option has been implemented.  The -r option tells Yacc to
2234949Sbaptput the read-only tables in y.tab.c and the code and variables in
3234949Sbapty.code.c.  Keith Bostic asked for this option so that :yyfix could be
4234949Sbapteliminated.
5234949Sbapt
6234949Sbapt     The -l and -t options have been implemented.  The -l option tells
7234949SbaptYacc not to include #line directives in the code it produces.  The -t
8234949Sbaptoption causes debugging code to be included in the compiled parser.
9234949Sbapt
10234949Sbapt     The code for error recovery has been changed to implement the same
11234949Sbaptalgorithm as AT&T Yacc.  There will still be differences in the way
12234949Sbapterror recovery works because AT&T Yacc uses more default reductions
13234949Sbaptthan Berkeley Yacc.
14234949Sbapt
15234949Sbapt     The environment variable TMPDIR determines the directory where
16234949Sbapttemporary files will be created.  If TMPDIR is defined, temporary files
17234949Sbaptwill be created in the directory whose pathname is the value of TMPDIR.
18234949SbaptBy default, temporary files are created in /tmp.
19234949Sbapt
20234949Sbapt     The keywords are now case-insensitive.  For example, %nonassoc,
21234949Sbapt%NONASSOC, %NonAssoc, and %nOnAsSoC are all equivalent.
22234949Sbapt
23234949Sbapt     Commas and semicolons that are not part of C code are treated as
24234949Sbaptcommentary.
25234949Sbapt
26234949Sbapt     Line-end comments, as in BCPL, are permitted.  Line-end comments
27234949Sbaptbegin with // and end at the next end-of-line.  Line-end comments are
28234949Sbaptpermitted in C code; they are converted to C comments on output.
29234949Sbapt
30234949Sbapt     The form of y.output files has been changed to look more like
31234949Sbaptthose produced by AT&T Yacc.
32234949Sbapt
33234949Sbapt     A new kind of declaration has been added.  The form of the declaration
34234949Sbaptis
35234949Sbapt
36234949Sbapt	  %ident string
37234949Sbapt
38234949Sbaptwhere string is a sequence of characters begining with a double quote
39234949Sbaptand ending with either a double quote or the next end-of-line, whichever
40234949Sbaptcomes first.  The declaration will cause a #ident directive to be written
41234949Sbaptnear the start of the output file.
42234949Sbapt
43234949Sbapt     If a parser has been compiled with debugging code, that code can be
44234949Sbaptenabled by setting an environment variable.  If the environment variable
45234949SbaptYYDEBUG is set to 0, debugging output is suppressed.  If it is set to 1,
46234949Sbaptdebugging output is written to standard output.
47