linux-kernel - [BUG] Build error for 4.15-rc3 kernel caused by patch "kbuild: Add a cache for generated variables"

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Message-ID: <8d9a5c09-23e2-253b-860d-7bc9d20f5317@alibaba-inc.com>
Date:   Sun, 17 Dec 2017 06:35:24 +0800
From:   "Yang Shi" <yang.s@...baba-inc.com>
To:     dianders@...omium.org
Cc:     Arnd Bergmann <arnd@...db.de>, mingo@...nel.org,
        linux@...ck-us.net, yamada.masahiro@...ionext.com,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [BUG] Build error for 4.15-rc3 kernel caused by patch "kbuild: Add a
 cache for generated variables"

Hi folks,

I just upgraded gcc to 6.4 on my centos 7 machine by Arnd's suggestion. 
But, I ran into the below compile error with 4.15-rc3 kernel:

In file included from ./include/uapi/linux/uuid.h:21:0,
                  from ./include/linux/uuid.h:19,
                  from ./include/linux/mod_devicetable.h:12,
                  from scripts/mod/devicetable-offsets.c:2:
./include/linux/string.h:8:20: fatal error: stdarg.h: No such file or 
directory
  #include <stdarg.h>

I bisected to commit 3298b690b21cdbe6b2ae8076d9147027f396f2b1 ("kbuild: 
Add a cache for generated variables"). Once I revert this commit, kernel 
build is fine.

gcc 4.8.5 is fine to build kernel with this commit.

I'm not quite sure if this is a bug or my gcc install is skewed although 
it can build kernel without that commit since that commit might 
exacerbate the case.

Any hint is appreciated

Regards,
Yang