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- The -r option has been implemented. The -r option tells Yacc to
- put the read-only tables in y.tab.c and the code and variables in
- y.code.c. Keith Bostic asked for this option so that :yyfix could be
- eliminated.
- The -l and -t options have been implemented. The -l option tells
- Yacc not to include #line directives in the code it produces. The -t
- option causes debugging code to be included in the compiled parser.
- The code for error recovery has been changed to implement the same
- algorithm as AT&T Yacc. There will still be differences in the way
- error recovery works because AT&T Yacc uses more default reductions
- than Berkeley Yacc.
- The environment variable TMPDIR determines the directory where
- temporary files will be created. If TMPDIR is defined, temporary files
- will be created in the directory whose pathname is the value of TMPDIR.
- By default, temporary files are created in /tmp.
- The keywords are now case-insensitive. For example, %nonassoc,
- %NONASSOC, %NonAssoc, and %nOnAsSoC are all equivalent.
- Commas and semicolons that are not part of C code are treated as
- commentary.
- Line-end comments, as in BCPL, are permitted. Line-end comments
- begin with // and end at the next end-of-line. Line-end comments are
- permitted in C code; they are converted to C comments on output.
- The form of y.output files has been changed to look more like
- those produced by AT&T Yacc.
- A new kind of declaration has been added. The form of the declaration
- is
- %ident string
- where string is a sequence of characters begining with a double quote
- and ending with either a double quote or the next end-of-line, whichever
- comes first. The declaration will cause a #ident directive to be written
- near the start of the output file.
- If a parser has been compiled with debugging code, that code can be
- enabled by setting an environment variable. If the environment variable
- YYDEBUG is set to 0, debugging output is suppressed. If it is set to 1,
- debugging output is written to standard output.
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