Don't put the pre-prologue in the header file. For the yacc.c code

file and the glr.c header and code files, move the pre-prologue before
the token definitions.  Add new %before-definitions and
%after-definitions to declare code that will go in both the header file
and code file.  Discussed at
<http://lists.gnu.org/archive/html/bison-patches/2005-12/msg00000.html>,
<http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00016.html>,
and
<http://lists.gnu.org/archive/html/bison-patches/2006-06/msg00055.html>.
* NEWS (2.3+): Describe these changes.
* data/glr.c (b4_pre_prologue): Move from within to before...
(b4_shared_declarations): ... this.
Add new b4_before_definitions before b4_token_enums.
Add new b4_after_definitions at the end.
* data/glr.cc (b4_pre_prologue): Replace with...
(b4_before_definitions): ... this in the header file.
(b4_after_definitions): New near the end of the header file.
* data/lalr1.cc (b4_pre_prologue): Move from the header file to the
code file right before including the header file.
(b4_before_definitions): New in the previous position of
b4_pre_prologue in the header file.
(b4_after_definitions): New near the end of the header file.
* data/yacc.c: Clean up some m4 quoting especially in the header file.
(b4_token_enums_defines): In the code file, move to right before
YYSTYPE for consistency with the header file.
(b4_before_definitions): New right before b4_token_enums_defines in
both the header and code file.
(b4_after_definitions): New right after YYLTYPE and yylloc in both the
header and code file.
* doc/bison.texinfo (Prologue): Show use of %before-definitions instead
of prologues for %union dependencies.
(Bison Declaration Summary): In %defines description, mention the
effect of %before-definitions and %after-definitions on the header
file.
(Calc++ Parser): Forward declare driver in a %before-definitions rather
than in the pre-prologue so that make check succeeds.
(Bison Symbols): Add entries for %before-definitions and
%after-definitions.
* src/parse-gram.y (PERCENT_BEFORE_DEFINITIONS): New token for
%before-definitions.
(PERCENT_AFTER_DEFINITIONS): New token for %after-definitions.
(declaration): Parse those declarations and append to
b4_before_definitions and b4_after_definitions, respectively.
* src/reader.c (before_definitions, after_definitions): New bools to
track whether those declarations have been seen.
(prologue_augment): Add to the post-prologue if %union,
%before-definitions, or %after-definitions has been seen.
* src/reader.h (before_definitions, after_definitions): New extern's.
* src/scan-gram.l: Scan the new declarations.
* tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR): Place the second
prologue block in a %before-definitions or a %after-definitions based
on whether the %union is declared.
* tests/regression.at (Early token definitions with --yacc, Early token
definitions without --yacc): Move tests for token definitions into the
post-prologue since token names are no longer defined in the
pre-prologue.

data/yacc.c

@@ -160,8 +160,6 @@ m4_if(b4_prefix, [yy], [],
 #define yynerrs b4_prefix[]nerrs
 b4_locations_if([#define yylloc b4_prefix[]lloc])])[
 
-]b4_token_enums_defines(b4_tokens)[
-
 /* Copy the first part of user declarations.  */
 ]b4_pre_prologue[
 
@@ -183,9 +181,15 @@ b4_locations_if([#define yylloc b4_prefix[]lloc])])[
 # define YYTOKEN_TABLE ]b4_token_table[
 #endif
 
+]m4_ifdef([b4_before_definitions],
+[[/* Copy the %before-definitions blocks.  */
+]b4_before_definitions])[]dnl
+
+b4_token_enums_defines(b4_tokens)[
+
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 ]m4_ifdef([b4_stype],
-[typedef union b4_union_name
+[[typedef union ]b4_union_name
 b4_stype
 /* Line __line__ of yacc.c.  */
 b4_syncline([@oline@], [@ofile@])
@@ -207,14 +211,17 @@ typedef struct YYLTYPE
 # define yyltype YYLTYPE /* obsolescent; will be withdrawn */
 # define YYLTYPE_IS_DECLARED 1
 # define YYLTYPE_IS_TRIVIAL 1
-#endif
-])[
+#endif])
 
-/* Copy the second part of user declarations.  */
+m4_ifdef([b4_after_definitions],
+[[/* Copy the %after-definitions blocks.  */
+]b4_after_definitions])[]dnl
+
+[/* Copy the second part of user declarations.  */
 ]b4_post_prologue
 
-/* Line __line__ of yacc.c.  */
-b4_syncline([@oline@], [@ofile@])[
+[/* Line __line__ of yacc.c.  */
+]b4_syncline([@oline@], [@ofile@])[
 
 #ifdef short
 # undef short
@@ -1491,22 +1498,26 @@ b4_defines_if(
 b4_copyright([Skeleton interface for Bison's Yacc-like parsers in C],dnl '
   [1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006])
 
+m4_ifdef([b4_before_definitions],
+[[/* Copy the %before-definitions blocks.  */
+]b4_before_definitions])[]dnl
+
 b4_token_enums_defines(b4_tokens)
 
-#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
-m4_ifdef([b4_stype],
-[typedef union b4_union_name
+[#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
+]m4_ifdef([b4_stype],
+[[typedef union ]b4_union_name
 b4_stype
 /* Line __line__ of yacc.c.  */
 b4_syncline([@oline@], [@ofile@])
 	YYSTYPE;],
-[typedef int YYSTYPE;])
+[typedef int YYSTYPE;])[
 # define yystype YYSTYPE /* obsolescent; will be withdrawn */
 # define YYSTYPE_IS_DECLARED 1
 # define YYSTYPE_IS_TRIVIAL 1
 #endif
 
-b4_pure_if([],
+]b4_pure_if([],
 [extern YYSTYPE b4_prefix[]lval;])
 
 b4_locations_if(
@@ -1523,7 +1534,11 @@ typedef struct YYLTYPE
 # define YYLTYPE_IS_TRIVIAL 1
 #endif
 
-b4_pure_if([],
+]b4_pure_if([],
 	   [extern YYLTYPE b4_prefix[]lloc;])
-])dnl b4_locations_if
+)dnl b4_locations_if
+
+m4_ifdef([b4_after_definitions],
+[[/* Copy the %after-definitions blocks.  */
+]b4_after_definitions])[]dnl
 ])dnl b4_defines_if