linux-kernel - Re: build error

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Date:   Mon, 29 Jul 2019 12:18:28 +0100
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     Will Deacon <will@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: build error

On 29/07/2019 12:12, Matteo Croce wrote:
> On Mon, Jul 29, 2019 at 1:08 PM Vincenzo Frascino
> <vincenzo.frascino@....com> wrote:
>>
>> Hi Matteo,
>>
>> On 29/07/2019 11:25, Matteo Croce wrote:
>>> On Mon, Jul 29, 2019 at 12:16 PM Vincenzo Frascino
>>> <vincenzo.frascino@....com> wrote:
>>>>
>>>> Hi Matteo and Will,
>>>>
>>>>
>>>> If I try to build a fresh kernel on my machine with the standard "make mrproper
>>>> && make defconfig && make" I do not see the reported issue (Please see below
>>>> scissors).
>>>>
>>>> At this point would be interesting to know more about how Matteo is building the
>>>> kernel, and try to reproduce the issue here.
>>>>
>>>> @Matteo, could you please provide the full .config and the steps you used to
>>>> generate it? Is it an 'oldconfig'?
>>>>
>>>
>>> Hi,
>>>
>>> yes, this is an oldconfig from a vanilla 5.2, I attach it
>>> (the non gzipped config was dropped by the ML filter)
>>>
>>>
>>
>> I tried your config file and seems working correctly:
>>
>> # cp ~/config ../linux-out/.config
>> # make oldconfig
>> # make
>>
>> arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT not defined or empty, the compat
>> vDSO will not be built
>>
>> ---
>>
>> Could you please send to me the config file that does not contain:
>> CONFIG_CROSS_COMPILE_COMPAT_VDSO=""
>>
>> The original one I mean, on which you did not run make oldconfig.
>> My suspect at this point is that the string passed to
>> CONFIG_CROSS_COMPILE_COMPAT_VDSO is not completely empty.
>>
>> In fact if I do CONFIG_CROSS_COMPILE_COMPAT_VDSO=" " (single space),
>> I do have a failure similar to the one you reported.
>>
> 
> That's what I initially thought, but the string is effectively empty:
> 
> # make
> arch/arm64/Makefile:58: *** gcc not found, check CROSS_COMPILE_COMPAT.  Stop.
> # grep CROSS_COMPILE_COMPAT_VDSO .config |hexdump -C
> 00000000  43 4f 4e 46 49 47 5f 43  52 4f 53 53 5f 43 4f 4d  |CONFIG_CROSS_COM|
> 00000010  50 49 4c 45 5f 43 4f 4d  50 41 54 5f 56 44 53 4f  |PILE_COMPAT_VDSO|
> 00000020  3d 22 22 0a                                       |="".|
> 00000024
> 
> 

Ok, it is strange though that your config file works in my environment. Could
you please provide to me the starting .config file?

Could you please confirm as well that "make mrproper && make defconfig && make"
builds correctly for you?

Last but not least, are you on any irc channel? Might help speeding up the
debugging if we talk there.

-- 
Regards,
Vincenzo