linux-kernel - Re: Makefile race in 4.9-rc3 (generated/autoksyms.h: No such file or directory)

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Date:   Mon, 7 Nov 2016 11:11:18 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ken Moffat <zarniwhoop73@...glemail.com>,
        linux-kernel@...r.kernel.org,
        linux-kbuild <linux-kbuild@...r.kernel.org>,
        Michal Marek <mmarek@...e.cz>
Subject: Re: Makefile race in 4.9-rc3 (generated/autoksyms.h: No such file or
 directory)

[adding linux-kbuild and Michal]
[trying again]

On 10/31/16 13:46, Ken Moffat wrote:
> 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.


-- 
~Randy