linux-kernel - [PATCH] Fix the oldconfig target rule

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Date:   Sun, 8 Jul 2018 06:31:28 +0000
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] Fix the oldconfig target rule

The next make after an oldconfig reads in the outdated
include/config/auto.conf which can kill the make before
it is able to call the syncconfig target.

$ make defconfig
*** Default configuration is based on 'x86_64_defconfig'
$ make
scripts/kconfig/conf  --syncconfig Kconfig
Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y,
please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.

$ sed -i s/CONFIG_UNWINDER_ORC=y// .configs
$ make oldconfig
Choose kernel unwinder
> 1. ORC unwinder (UNWINDER_ORC) (NEW)
   2. Frame pointer unwinder (UNWINDER_FRAME_POINTER)
choice[1-2?]: 2
$ make
Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y,
please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.

With this patch oldconfig and similar targets like
menuconfig call syncconfig to avoid this failure.

Signed-off-by: Bernd Edlinger <bernd.edlinger@...mail.de>
---
  scripts/kconfig/Makefile | 1 +
  1 file changed, 1 insertion(+)

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index a3ac2c9..ef34275 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -62,6 +62,7 @@ PHONY += $(simple-targets)

  $(simple-targets): $(obj)/conf
  	$< $(silent) --$@ $(Kconfig)
+	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig

  PHONY += oldnoconfig silentoldconfig savedefconfig defconfig

-- 
1.9.1