* Noteworthy changes in release ?.? (????-??-??) [?]
+
+* Noteworthy changes in release 3.0.1 (2013-11-12) [stable]
+
+** Bug fixes
+
+*** Errors in caret diagnostics
+
+ On some platforms, some errors could result in endless diagnostics.
+
+*** Fixes of the -Werror option
+
+ Options such as "-Werror -Wno-error=foo" were still turning "foo"
+ diagnostics into errors instead of warnings. This is fixed.
+
+ Actually, for consistency with GCC, "-Wno-error=foo -Werror" now also
+ leaves "foo" diagnostics as warnings. Similarly, with "-Werror=foo
+ -Wno-error", "foo" diagnostics are now errors.
+
+*** GLR Predicates
+
+ As demonstrated in the documentation, one can now leave spaces between
+ "%?" and its "{".
+
+*** Installation
+
+ The yacc.1 man page is no longer installed if --disable-yacc was
+ specified.
+
+*** Fixes in the test suite
+
+ Bugs and portability issues.
+
+* Noteworthy changes in release 3.0 (2013-07-25) [stable]
+
** WARNING: Future backward-incompatibilities!
Like other GNU packages, Bison will start using some of the C99 features
Missing semicolons at the end of actions are no longer added (as announced
in the release 2.5).
+*** Use of YACC='bison -y'
+
+ TL;DR: With Autoconf <= 2.69, pass -Wno-yacc to (AM_)YFLAGS if you use
+ Bison extensions.
+
+ Traditional Yacc generates 'y.tab.c' whatever the name of the input file.
+ Therefore Makefiles written for Yacc expect 'y.tab.c' (and possibly
+ 'y.tab.h' and 'y.outout') to be generated from 'foo.y'.
+
+ To this end, for ages, AC_PROG_YACC, Autoconf's macro to look for an
+ implementation of Yacc, was using Bison as 'bison -y'. While it does
+ ensure compatible output file names, it also enables warnings for
+ incompatibilities with POSIX Yacc. In other words, 'bison -y' triggers
+ warnings for Bison extensions.
+
+ Autoconf 2.70+ fixes this incompatibility by using YACC='bison -o y.tab.c'
+ (which also generates 'y.tab.h' and 'y.output' when needed).
+ Alternatively, disable Yacc warnings by passing '-Wno-yacc' to your Yacc
+ flags (YFLAGS, or AM_YFLAGS with Automake).
+
** Bug fixes
*** The epilogue is no longer affected by internal #defines (glr.c)
Changes in Bison 2.7 introduced a dependency on FILE and fprintf when
locations are enabled. This is fixed.
+*** Warnings about useless %pure-parser/%define api.pure are restored
+
** Diagnostics reported by Bison
Most of these features were contributed by Théophile Ranquet and Victor
%param {arg1_type *arg1} {arg2_type *arg2}
+** Types of values for %define variables
+
+ Bison used to make no difference between '%define foo bar' and '%define
+ foo "bar"'. The former is now called a 'keyword value', and the latter a
+ 'string value'. A third kind was added: 'code values', such as '%define
+ foo {bar}'.
+
+ Keyword variables are used for fixed value sets, e.g.,
+
+ %define lr.type lalr
+
+ Code variables are used for value in the target language, e.g.,
+
+ %define api.value.type {struct semantic_type}
+
+ String variables are used remaining cases, e.g. file names.
+
** Variable api.token.prefix
The variable api.token.prefix changes the way tokens are identified in
with identifiers in the target language. For instance
%token FILE for ERROR
- %define api.token.prefix "TOK_"
+ %define api.token.prefix {TOK_}
%%
start: FILE for ERROR;
yylval.ival = 42; return INT;
yylval.sval = "42"; return STRING;
- The %define variable api.value.type supports several special values. The
- value "union" means that the user provides genuine types, not union member
- names such as "ival" and "sval" above.
+ The %define variable api.value.type supports both keyword and code values.
+
+ The keyword value 'union' means that the user provides genuine types, not
+ union member names such as "ival" and "sval" above (WARNING: will fail if
+ -y/--yacc/%yacc is enabled).
- %define api.value.type "union"
+ %define api.value.type union
%token <int> INT "integer"
%token <char *> STRING "string"
%printer { fprintf (yyo, "%d", $$); } <int>
yylval.INT = 42; return INT;
yylval.STRING = "42"; return STRING;
- The value "variant" is somewhat equivalent, but for C++ special provision
- is made to allow classes to be used (more about this below).
+ The keyword value variant is somewhat equivalent, but for C++ special
+ provision is made to allow classes to be used (more about this below).
- %define api.value.type "variant"
+ %define api.value.type variant
%token <int> INT "integer"
%token <std::string> STRING "string"
- Any other name is a user type to use. This is where YYSTYPE used to be
- used.
+ Code values (in braces) denote user defined types. This is where YYSTYPE
+ used to be used.
%code requires
{
} u;
};
}
- %define api.value.type "struct my_value"
+ %define api.value.type {struct my_value}
%token <u.ival> INT "integer"
%token <u.sval> STRING "string"
%printer { fprintf (yyo, "%d", $$); } <u.ival>
** Java skeleton improvements
- Contributed by Paolo Bonzini.
-
The constants for token names were moved to the Lexer interface. Also, it
is possible to add code to the parser's constructors using "%code init"
and "%define init_throws".
+ Contributed by Paolo Bonzini.
+
+ The Java skeleton now supports push parsing.
+ Contributed by Dennis Heimbigner.
** C++ skeletons improvements
...
}
+*** C++ locations
+
+ There are operator- and operator-= for 'location'. Negative line/column
+ increments can no longer underflow the resulting value.
+
+* Noteworthy changes in release 2.7.1 (2013-04-15) [stable]
+
+** Bug fixes
+
+*** Fix compiler attribute portability (yacc.c)
+
+ With locations enabled, __attribute__ was used unprotected.
+
+*** Fix some compiler warnings (lalr1.cc)
+
* Noteworthy changes in release 2.7 (2012-12-12) [stable]
** Bug fixes
projects / bison.git / blobdiff