intl: Unbreak intl build with bison 3 when no regeneration is needed [PR92008]

As Iain reported, my change broke the case when one has bison >= 3,
but make decides there is no reason to regenerate plural.c, unfortunately
that seems to be a scenario I haven't tested.  The problem is that
the pregenerated plural.c has been generated with bison 1.35, but when
config.h says HAVE_BISON3, the code assumes it is the bison3 variant.
What used to work fine is when one has bison >= 3 and plural.c has been
regenerated (e.g. do touch intl/plural.y and it will work), or when
one doesn't have any bison (then nothing is regenerated, but HAVE_BISON3
isn't defined either), or when one has bison < 3 and doesn't need to
regenerate, or when one has bison < 3 and it is regenerated.

The following patch fixes this, by killing the HAVE_BISON3 macro from
config.h, and instead remembering the fact whether plural.c has been created
with bison < 3 or bison >= 3 in a separate new plural-config.h header.
The way this works:
- user doesn't have bison
- user has bison >= 3, but intl/{plural-config.h,plural.c} aren't older than intl/plural.y
- user has bison < 3, but intl/{plural-config.h,plural.c} aren't older than intl/plural.y
	pregenerated !USE_BISON3 plural.c and plural-config.h from source
	dir is used, nothing in the objdir
- user has bison >= 3 and intl/plural.y is newer
	Makefile generates plural.c and USE_BISON3 plural-config.h in the
	objdir, which is then used in preference to srcdir copies
- user has bison < 3 and intl/plural.y is newer
	Makefile generates plural.c and !USE_BISON3 plural-config.h in the
	objdir, which is then used in preference to srcdir copies
I have tested all these cases and make all-yes worked in all the cases.
If one uses the unsupported ./configure where srcdir == objdir, I guess
(though haven't tested) that it should still work, just it would be nice
if such people didn't try to check in the plural{.c,-config.h} they have
regenerated.
What doesn't work, but didn't work before either (just tested gcc-9 branch
too) is when one doesn't have bison and plural.y is newer than plural.c.
Don't do that ;)

intl/ChangeLog
2020-04-16  Jakub Jelinek  <jakub@redhat.com>

	PR bootstrap/92008
	* configure.ac: Remove HAVE_BISON3 AC_DEFINE.
	* Makefile.in (HEADERS): Add plural-config.h.
	(.y.c): Also create plural-config.h.
	(dcigettext.o loadmsgcat.o plural.o plural-exp.o): Also depend
	on plural-config.h.
	(plural-config.h): Depend on plural.c.
	* plural-exp.h: Include plural-config.h.  Use USE_BISON3 instead
	of HAVE_BISON3.
	* plural.y: Use USE_BISON3 instead of HAVE_BISON3.
	* configure: Regenerated.
	* plural.c: Regenerated.
	* config.h.in: Regenerated.
	* plural-config.h: Generated.

1 files changed, 4 insertions, 4 deletions

diff --git a/intl/plural.y b/intl/plural.y
index c97f09a..7531da5 100644
--- a/intl/plural.y
+++ b/intl/plural.y
@@ -40,7 +40,7 @@
 # define __gettextparse PLURAL_PARSE
 #endif
 
-#ifndef HAVE_BISON3
+#ifndef USE_BISON3
 #define YYLEX_PARAM	&((struct parse_args *) arg)->cp
 #define YYPARSE_PARAM	arg
 #endif
@@ -71,7 +71,7 @@ static inline struct expression *new_exp_3 PARAMS ((enum operator op,
 						   struct expression *bexp,
 						   struct expression *tbranch,
 						   struct expression *fbranch));
-#ifdef HAVE_BISON3
+#ifdef USE_BISON3
 static int yylex PARAMS ((YYSTYPE *lval, struct parse_args *arg));
 static void yyerror PARAMS ((struct parse_args *arg, const char *str));
 #else
@@ -266,7 +266,7 @@ FREE_EXPRESSION (exp)
 }
 
 
-#ifdef HAVE_BISON3
+#ifdef USE_BISON3
 static int
 yylex (lval, arg)
      YYSTYPE *lval;
@@ -420,7 +420,7 @@ yylex (lval, pexp)
 }
 
 
-#ifdef HAVE_BISON3
+#ifdef USE_BISON3
 static void
 yyerror (arg, str)
      struct parse_args *arg;