kconfig: split the lexer out of zconf.y

Compile zconf.lex.c independently of the other files.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/kconfig/Makefile

@@ -143,11 +143,9 @@ help:
 
 # ===========================================================================
 # object files used by all kconfig flavours
-common-objs	:= confdata.o expr.o symbol.o preprocess.o zconf.tab.o
+common-objs	:= confdata.o expr.o symbol.o preprocess.o zconf.lex.o zconf.tab.o
 
-targets		+= zconf.lex.c
-
-# generated files seem to need this to find local include files
+$(obj)/zconf.lex.o: $(obj)/zconf.tab.h
 HOSTCFLAGS_zconf.lex.o	:= -I$(src)
 HOSTCFLAGS_zconf.tab.o	:= -I$(src)
 
@@ -202,8 +200,6 @@ HOSTCFLAGS_gconf.o  = $(shell . $(obj)/.gconf-cfg && echo $$cflags)
 
 $(obj)/gconf.o: $(obj)/.gconf-cfg
 
-$(obj)/zconf.tab.o: $(obj)/zconf.lex.c
-
 # check if necessary packages are available, and configure build flags
 define filechk_conf_cfg
 	$(CONFIG_SHELL) $<

scripts/kconfig/lkc.h

@@ -90,6 +90,9 @@ void *xrealloc(void *p, size_t size);
 char *xstrdup(const char *s);
 char *xstrndup(const char *s, size_t n);
 
+/* zconf.l */
+int yylex(void);
+
 struct gstr {
 	size_t len;
 	char  *s;

scripts/kconfig/zconf.l

@@ -15,6 +15,7 @@
 #include <unistd.h>
 
 #include "lkc.h"
+#include "zconf.tab.h"
 
 #define YY_DECL		static int yylex1(void)
 

scripts/kconfig/zconf.y

@@ -20,7 +20,6 @@
 
 int cdebug = PRINTD;
 
-int yylex(void);
 static void yyerror(const char *err);
 static void zconfprint(const char *err, ...);
 static void zconf_error(const char *err, ...);
@@ -729,6 +728,5 @@ void zconfdump(FILE *out)
 	}
 }
 
-#include "zconf.lex.c"
 #include "util.c"
 #include "menu.c"