linux-kernel - [PATCH] kconfig: suppress "configuration written to .config" for syncconfig

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Date:   Thu, 16 Aug 2018 16:48:26 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kconfig: suppress "configuration written to .config" for syncconfig

The top-level Makefile invokes "make syncconfig" when necessary.
Then, Kconfig displays the following message when .config is updated.

  #
  # configuration written to .config
  #

It is distracting because "make syncconfig" happens during the build
stage, and does nothing important in most cases.

Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 scripts/kconfig/conf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index b35cc93..7b2b372 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -508,6 +508,11 @@ 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:
-- 
2.7.4