linux-kernel - [PATCH] kbuild: invoke syncconfig if autoconf.h is missing

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Message-Id: <20200501060141.1924489-1-masahiroy@kernel.org>
Date:   Fri,  1 May 2020 15:01:41 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: [PATCH] kbuild: invoke syncconfig if autoconf.h is missing

If include/generated/autoconf.h is accidentally lost somehow,
there is no clear way to fix it. Make it self-healing.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 9ff00bfe0575..f0b6f9fd5d25 100644
--- a/Makefile
+++ b/Makefile
@@ -698,7 +698,7 @@ $(KCONFIG_CONFIG):
 # This exploits the 'multi-target pattern rule' trick.
 # 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)
-%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
+%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
 	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
 else # !may-sync-config
 # External modules and some install targets need include/generated/autoconf.h
@@ -1141,7 +1141,8 @@ scripts: scripts_basic scripts_dtc
 PHONY += prepare archprepare
 
 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
-	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
+	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
+	include/generated/autoconf.h
 
 prepare0: archprepare
 	$(Q)$(MAKE) $(build)=scripts/mod
-- 
2.25.1