From: Ben Hutchings <ben@decadent.org.uk>
Date: Tue, 14 Sep 2010 04:33:34 +0100
Subject: Kbuild: kconfig: Verbose version of --listnewconfig
Forwarded: http://thread.gmane.org/gmane.linux.kbuild.devel/5774

If the KBUILD_VERBOSE environment variable is set to non-zero, show
the default values of new symbols and not just their names.

Based on work by Bastian Blank <waldi@debian.org> and
maximilian attems <max@stro.at>.  Simplified by Michal Marek
<mmarek@suse.cz>.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 scripts/kconfig/conf.c      |   42 ++++++++++++++++++++++++++++++++----------
 scripts/kconfig/confdata.c  |    9 +++++++++
 scripts/kconfig/expr.h      |    2 ++
 scripts/kconfig/lkc_proto.h |    1 +
 4 files changed, 44 insertions(+), 10 deletions(-)

--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -368,7 +368,6 @@ static void conf(struct menu *menu)
 		switch (prop->type) {
 		case P_MENU:
 			if ((input_mode == silentoldconfig ||
-			     input_mode == listnewconfig ||
 			     input_mode == olddefconfig) &&
 			    rootEntry != menu) {
 				check_conf(menu);
@@ -429,11 +428,7 @@ static void check_conf(struct menu *menu
 	if (sym && !sym_has_value(sym)) {
 		if (sym_is_changable(sym) ||
 		    (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)) {
-			if (input_mode == listnewconfig) {
-				if (sym->name && !sym_is_choice_value(sym)) {
-					printf("%s%s\n", CONFIG_, sym->name);
-				}
-			} else if (input_mode != olddefconfig) {
+			if (input_mode != olddefconfig) {
 				if (!conf_cnt++)
 					printf(_("*\n* Restart config...\n*\n"));
 				rootEntry = menu_get_parent_menu(menu);
@@ -446,6 +441,30 @@ static void check_conf(struct menu *menu
 		check_conf(child);
 }
 
+static void report_conf(struct menu *menu, bool verbose)
+{
+	struct symbol *sym;
+	struct menu *child;
+
+	if (!menu_is_visible(menu))
+		return;
+
+	if (verbose && menu == &rootmenu) {
+		printf("\n#\n"
+		       "# Changes:\n"
+		       "#\n");
+	}
+
+	sym = menu->sym;
+	if (sym && (sym->flags & SYMBOL_NEW) &&
+	    sym_is_changable(sym) && sym->name && !sym_is_choice_value(sym)) {
+		conf_write_new_symbol(stdout, sym, verbose);
+	}
+
+	for (child = menu->list; child; child = child->next)
+		report_conf(child, verbose);
+}
+
 static struct option long_opts[] = {
 	{"oldaskconfig",    no_argument,       NULL, oldaskconfig},
 	{"oldconfig",       no_argument,       NULL, oldconfig},
@@ -493,6 +512,7 @@ int main(int ac, char **av)
 	const char *progname = av[0];
 	int opt;
 	const char *name, *defconfig_file = NULL /* gcc uninit */;
+	const char *value;
 	struct stat tmpstat;
 
 	setlocale(LC_ALL, "");
@@ -668,16 +688,18 @@ int main(int ac, char **av)
 		input_mode = silentoldconfig;
 		/* fall through */
 	case oldconfig:
-	case listnewconfig:
 	case olddefconfig:
 	case silentoldconfig:
 		/* Update until a loop caused no more changes */
 		do {
 			conf_cnt = 0;
 			check_conf(&rootmenu);
-		} while (conf_cnt &&
-			 (input_mode != listnewconfig &&
-			  input_mode != olddefconfig));
+		} while (conf_cnt && input_mode != olddefconfig);
+		break;
+	case listnewconfig:
+		conf_set_all_new_symbols(def_default);
+		value = getenv("KBUILD_VERBOSE");
+		report_conf(&rootmenu, value && atoi(value));
 		break;
 	}
 
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -732,6 +732,14 @@ next_menu:
 	return 0;
 }
 
+void conf_write_new_symbol(FILE *fp, struct symbol *sym, bool verbose)
+{
+	if (verbose)
+		conf_write_symbol(fp, sym, &kconfig_printer_cb, NULL);
+	else
+		fprintf(fp, "%s%s\n", CONFIG_, sym->name);
+}
+
 int conf_write(const char *name)
 {
 	FILE *out;
@@ -1164,7 +1172,10 @@ bool conf_set_all_new_symbols(enum conf_
 	bool has_changed = false;
 
 	for_all_symbols(i, sym) {
-		if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
+		if (sym_has_value(sym))
+			continue;
+		sym->flags |= SYMBOL_NEW;
+		if (sym->flags & SYMBOL_VALID)
 			continue;
 		switch (sym_get_type(sym)) {
 		case S_BOOLEAN:
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -112,6 +112,8 @@ struct symbol {
 /* Set symbol to y if allnoconfig; used for symbols that hide others */
 #define SYMBOL_ALLNOCONFIG_Y 0x200000
 
+#define SYMBOL_NEW        0x200000 /* symbol is new (loaded config did not provide a value) */
+
 #define SYMBOL_MAXLENGTH	256
 #define SYMBOL_HASHSIZE		9973
 
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -7,6 +7,7 @@ P(conf_read_simple,int,(const char *name
 P(conf_write_defconfig,int,(const char *name));
 P(conf_write,int,(const char *name));
 P(conf_write_autoconf,int,(void));
+P(conf_write_new_symbol, void,(FILE*, struct symbol*, bool));
 P(conf_get_changed,bool,(void));
 P(conf_set_changed_callback, void,(void (*fn)(void)));
 P(conf_set_message_callback, void,(void (*fn)(const char *fmt, va_list ap)));