1 files changed, 28 insertions, 18 deletions

diff --git a/kconfig/conf.c b/kconfig/conf.c
index abd5238..a0db354 100644
--- a/kconfig/conf.c
+++ b/kconfig/conf.c
@@ -475,6 +475,7 @@ int main(int ac, char **av)
 	int opt;
 	const char *name, *defconfig_file = NULL /* gcc uninit */;
 	struct stat tmpstat;
+	int no_conf_write = 0;
 
 	tty_stdio = isatty(0) && isatty(1);
 
@@ -486,6 +487,11 @@ int main(int ac, char **av)
 		input_mode = (enum input_mode)opt;
 		switch (opt) {
 		case syncconfig:
+			/*
+			 * syncconfig is invoked during the build stage.
+			 * Suppress distracting "configuration written to ..."
+			 */
+			conf_set_message_callback(NULL);
 			sync_kconfig = 1;
 			break;
 		case defconfig:
@@ -612,13 +618,14 @@ int main(int ac, char **av)
 	}
 
 	if (sync_kconfig) {
-		if (conf_get_changed()) {
-			name = getenv("KCONFIG_NOSILENTUPDATE");
-			if (name && *name) {
+		name = getenv("KCONFIG_NOSILENTUPDATE");
+		if (name && *name) {
+			if (conf_get_changed()) {
 				fprintf(stderr,
 					"\n*** The configuration requires explicit update.\n\n");
 				return 1;
 			}
+			no_conf_write = 1;
 		}
 	}
 
@@ -663,30 +670,33 @@ 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 (conf_get_changed() && conf_write(NULL)) {
-			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
-			exit(1);
-		}
-		/* In crosstool-NG, we do not use the autoconf stuff
-		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.
+		 */
+		/* In crosstool-NG, we do not use the autoconf stuff
+		if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
+			fprintf(stderr,
+				"\n*** Error during sync of the configuration.\n\n");
+			return 1;
+		}*/
 	}
 	return 0;
 }