7 files changed, 30 insertions, 19 deletions

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 5af899112cae..b35cc9303979 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -686,29 +686,32 @@ int main(int ac, char **av)
 		break;
 	}
 
-	if (sync_kconfig) {
-		/* syncconfig is used during the build so we shall update autoconf.
-		 * All other commands are only used to generate a config.
-		 */
-		if (!no_conf_write && conf_write(NULL)) {
-			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
-			exit(1);
-		}
-		if (conf_write_autoconf()) {
-			fprintf(stderr, "\n*** Error during update of the configuration.\n\n");
-			return 1;
-		}
-	} else if (input_mode == savedefconfig) {
+	if (input_mode == savedefconfig) {
 		if (conf_write_defconfig(defconfig_file)) {
 			fprintf(stderr, "n*** Error while saving defconfig to: %s\n\n",
 				defconfig_file);
 			return 1;
 		}
 	} else if (input_mode != listnewconfig) {
-		if (conf_write(NULL)) {
+		if (!no_conf_write && conf_write(NULL)) {
 			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
 			exit(1);
 		}
+
+		/*
+		 * Create auto.conf if it does not exist.
+		 * This prevents GNU Make 4.1 or older from emitting
+		 * "include/config/auto.conf: No such file or directory"
+		 * in the top-level Makefile
+		 *
+		 * syncconfig always creates or updates auto.conf because it is
+		 * used during the build.
+		 */
+		if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
+			fprintf(stderr,
+				"\n*** Error during sync of the configuration.\n\n");
+			return 1;
+		}
 	}
 	return 0;
 }
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index fad403dfa508..91d0a5c014ac 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -1013,13 +1013,17 @@ out:
 	return res;
 }
 
-int conf_write_autoconf(void)
+int conf_write_autoconf(int overwrite)
 {
 	struct symbol *sym;
 	const char *name;
+	const char *autoconf_name = conf_get_autoconfig_name();
 	FILE *out, *tristate, *out_h;
 	int i;
 
+	if (!overwrite && is_present(autoconf_name))
+		return 0;
+
 	sym_clear_all_valid();
 
 	conf_write_dep("include/config/auto.conf.cmd");
@@ -1082,14 +1086,13 @@ int conf_write_autoconf(void)
 	if (rename(".tmpconfig_tristate", name))
 		return 1;
 
-	name = conf_get_autoconfig_name();
-	if (make_parent_dir(name))
+	if (make_parent_dir(autoconf_name))
 		return 1;
 	/*
 	 * This must be the last step, kbuild has a dependency on auto.conf
 	 * and this marks the successful completion of the previous steps.
 	 */
-	if (rename(".tmpconfig", name))
+	if (rename(".tmpconfig", autoconf_name))
 		return 1;
 
 	return 0;
diff --git a/scripts/kconfig/gconf.c b/scripts/kconfig/gconf.c
index a9e48cc7b50a..36f578415c4a 100644
--- a/scripts/kconfig/gconf.c
+++ b/scripts/kconfig/gconf.c
@@ -525,6 +525,7 @@ void on_save_activate(GtkMenuItem * menuitem, gpointer user_data)
 {
 	if (conf_write(NULL))
 		text_insert_msg("Error", "Unable to save configuration !");
+	conf_write_autoconf(0);
 }
 
 
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index cf4510a2bdc7..86c267540ccc 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -7,7 +7,7 @@ int conf_read(const char *name);
 int conf_read_simple(const char *name, int);
 int conf_write_defconfig(const char *name);
 int conf_write(const char *name);
-int conf_write_autoconf(void);
+int conf_write_autoconf(int overwrite);
 bool conf_get_changed(void);
 void conf_set_changed_callback(void (*fn)(void));
 void conf_set_message_callback(void (*fn)(const char *s));
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index b8f3b607962a..83b5836615fb 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -974,6 +974,7 @@ static int handle_exit(void)
 					  "\n\n");
 			return 1;
 		}
+		conf_write_autoconf(0);
 		/* fall through */
 	case -1:
 		if (!silent)
diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index 5cbdb92e11b3..1ef232ae5ab9 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -674,6 +674,7 @@ static int do_exit(void)
 				  "Your configuration changes were NOT saved.",
 				  1,
 				  "<OK>");
+		conf_write_autoconf(0);
 		break;
 	default:
 		btn_dialog(
diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index ad9c22dd04f5..62261b3a13c7 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -1535,6 +1535,8 @@ bool ConfigMainWindow::saveConfig(void)
 		QMessageBox::information(this, "qconf", "Unable to save configuration!");
 		return false;
 	}
+	conf_write_autoconf(0);
+
 	return true;
 }