parser: handle %locations as %define locations.

* src/getargs.h, src/getargs.c (locations_flag): Remove.
	* src/getargs.c, src/scan-code.l: Use muscle_percent_define_ensure
	to set "locations" to true.
	* src/output.c (prepare): Don't output "locations".
	* src/scan-gram.l (%locations): Handle it as a %<flag>.
	* src/parse-gram.y: It's no longer a token.
	Don't handle it.
	* data/bison.m4 (b4_locations_if): Define it with
	b4_percent_define_if_define.
	* data/c.m4, data/glr.cc: Adjust.

data/bison.m4

@@ -333,7 +333,6 @@ m4_define([b4_$3_if],
 # Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
 b4_define_flag_if([defines])	        # Whether headers are requested.
 b4_define_flag_if([glr])		# Whether a GLR parser is requested.
-b4_define_flag_if([locations])	        # Whether locations are tracked.
 b4_define_flag_if([nondeterministic])	# Whether conflicts should be handled.
 b4_define_flag_if([yacc])	        # Whether POSIX Yacc is emulated.
 
@@ -687,6 +686,7 @@ b4_percent_define_if_define([assert])
 b4_percent_define_if_define([debug])
 b4_percent_define_if_define([error_verbose])
 b4_percent_define_if_define([lex_symbol])
+b4_percent_define_if_define([locations])     # Whether locations are tracked.
 b4_percent_define_if_define([variant])
 
 

data/c.m4

@@ -75,7 +75,7 @@ m4_define([b4_identification],
 #define YYPULL ]b4_pull_flag])[
 
 /* Using locations.  */
-#define YYLSP_NEEDED ]b4_locations_flag[
+#define YYLSP_NEEDED ]b4_locations_if([1], [0])[
 ]])
 
 

data/glr.cc

@@ -44,7 +44,7 @@
 #   filename member).
 
 # We require a pure interface using locations.
-m4_define([b4_locations_flag], [1])
+m4_define([b4_percent_define(locations)], [])
 m4_define([b4_pure_flag],      [1])
 
 # The header is mandatory.
@@ -228,7 +228,7 @@ b4_copyright([Skeleton interface for Bison GLR parsers in C++],
 #include <iostream>
 
 /* Using locations.  */
-#define YYLSP_NEEDED ]b4_locations_flag[
+#define YYLSP_NEEDED ]b4_locations_if([1], [0])[
 
 ]b4_namespace_open[
   class position;