From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1034314AbcJaUqq (ORCPT <rfc822;w@1wt.eu>);
        Mon, 31 Oct 2016 16:46:46 -0400
Received: from mail-vk0-f52.google.com ([209.85.213.52]:36619 "EHLO
        mail-vk0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1030295AbcJaUqo (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 31 Oct 2016 16:46:44 -0400
MIME-Version: 1.0
From: Ken Moffat <zarniwhoop73@googlemail.com>
Date: Mon, 31 Oct 2016 20:46:42 +0000
Message-ID: <CANVEwpYybigr3NcLA2TyoLZ4OkY1-7AcbL5t4vFyNpF488kFvQ@mail.gmail.com>
Subject: Makefile race in 4.9-rc3 (generated/autoksyms.h: No such file or directory)
To: linux-kernel@vger.kernel.org
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id u9VKkndg031672

I just tried to build 4.9 (rc3) for the first time (x86_64, i7 haswell)
 After making my choices in make oldconfig, make -j8 failed in
less than 2 sec.

   CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
  HOSTCC  scripts/sortextable
  CC      scripts/mod/devicetable-offsets.s
In file included from ./include/linux/linkage.h:6:0,
                 from ./include/linux/kernel.h:6,
                 from ./include/asm-generic/bug.h:13,
                 from ./arch/x86/include/asm/bug.h:35,
                 from ./include/linux/bug.h:4,
                 from ./include/linux/jump_label.h:170,
                 from ./arch/x86/include/asm/string_64.h:5,
                 from ./arch/x86/include/asm/string.h:4,
                 from ./include/linux/string.h:18,
                 from ./include/uapi/linux/uuid.h:21,
                 from ./include/linux/uuid.h:19,
                 from ./include/linux/mod_devicetable.h:12,
                 from scripts/mod/devicetable-offsets.c:2:
./include/linux/export.h:81:33: fatal error: generated/autoksyms.h: No
such file or directory
 #include <generated/autoksyms.h>
                                 ^
compilation terminated.
make[2]: *** [scripts/Makefile.build:154:
scripts/mod/devicetable-offsets.s] Error 1
make[1]: *** [scripts/Makefile.build:475: scripts/mod] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:559: scripts] Error 2
make: *** Waiting for unfinished jobs....

I then ran make clean and gave it another try, again using -j8.
This time i t worked, so I guess there is a race in a Makefile.

ĸen