linux-kernel - [PATCH] kbuild: Run syncconfig with -s

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Message-ID: <20200820063526.GA3278096@gmail.com>
Date:   Thu, 20 Aug 2020 08:35:26 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: [PATCH] kbuild: Run syncconfig with -s

On every kernel build that runs --syncconfig, there's an output of the following line:

  scripts/kconfig/conf  --syncconfig Kconfig

This is the only non-platform build message the kbuild system emits that isn't
prefixed by at least a space, or is a build warning.

Run it under -s - if there's any problem it will emit messages anyway.

With this change the following simple grep filter will show all build warnings
and errors of a kernel build:

   make | grep -v '^ '

Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 9cac6fde3479..2057c92a6205 100644
--- a/Makefile
+++ b/Makefile
@@ -709,7 +709,7 @@ $(KCONFIG_CONFIG):
 # The syncconfig should be executed only once to make all the targets.
 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
-	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
+	$(Q)$(MAKE) -sf $(srctree)/Makefile syncconfig
 else # !may-sync-config
 # External modules and some install targets need include/generated/autoconf.h
 # and include/config/auto.conf but do not care if they are up-to-date.