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For associating token numbers with token names for "yacc.c", don't use

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#define statements unless `--yacc' is specified; always use enum
yytokentype.  Most important discussions start at:
<http://lists.gnu.org/archive/html/bison-patches/2005-09/msg00053.html>,
<http://lists.gnu.org/archive/html/bison-patches/2005-12/msg00052.html>,
and
<http://lists.gnu.org/archive/html/bison-patches/2006-06/msg00043.html>.
* NEWS (2.3+): Mention.
* data/c.m4 (b4_yacc_if): New.
(b4_token_enums_defines): Use b4_yacc_if to decide whether to add the
token #define's.
* doc/bison.texinfo (Bison Options): Describe the effect of `--yacc'
on token name definitions.
* src/getargs.c (usage): Capitalize `Yacc' in English.
* src/output.c (prepare): Define b4_yacc_flag.
* tests/regression.at (Early token definitions): Test that tokens names
are defined before the pre-prologue not just before the post-prologue.
Remove this test case and copy to...
(Early token definitions with --yacc): ... this to test #define's.
(Early token definitions without --yacc): ... and this to test enums.
This commit is contained in:
Joel E. Denny
2006-06-11 18:27:44 +00:00
parent 9e6e7ed2b2
commit b931235eb9
7 changed files with 88 additions and 14 deletions
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9
doc/bison.texinfo
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@@ -6830,9 +6830,12 @@ different diagnostics to be generated, and may change behavior in
other minor ways. Most importantly, imitate Yacc's output
file name conventions, so that the parser output file is called
@file{y.tab.c}, and the other outputs are called @file{y.output} and
@file{y.tab.h}. Thus, the following shell script can substitute
for Yacc, and the Bison distribution contains such a script for
compatibility with @acronym{POSIX}:
@file{y.tab.h}.
Also, if generating an @acronym{LALR}(1) parser in C, generate @code{#define}
statements in addition to an @code{enum} to associate token numbers with token
names.
Thus, the following shell script can substitute for Yacc, and the Bison
distribution contains such a script for compatibility with @acronym{POSIX}:
@example
#! /bin/sh