linux-kernel - Re: [PATCH] gcov: Support for >=gcc-6 missing

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Date:	Fri, 1 Jul 2016 11:05:35 +0200
From:	Florian Meier <Florian.Meier@...ormatik.uni-erlangen.de>
To:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gcov: Support for >=gcc-6 missing

On 30 June 2016 at 14:13, Peter Oberparleiter
<oberpar@...ux.vnet.ibm.com> wrote:
> On 29.06.2016 16:58, Florian Meier wrote:
>> Hello!
>>
>> I've noticed problems ("not executed"/ "file empty") with the gcov
>> kernel support, when I'm using a gcc version >=6.
>> For me, it seems like this is no technical reason, gcc 6 just was
>> forgotten in the #ifdefs :).
>>
>> The following patch was tested with kernel 4.6.3 and gcc-6.1.1.
>>
>> I'm not 100% sure, that CGOV_COUNTERS=10 is correct, but the gcov
>> output seemed reasonable.
>
> Looking at the source of GCC 6's gcc/gcov-counter.def I don't see any
> new counters added compared to GCC 5.1.0, so GCOV_COUNTERS=10 should
> still be correct.
>
> Given that the same situation could again arise with a potential GCC
> 7.x, adding a "__GNUC__ > 5 ||" to the condition of the existing #if
> would be a longer-term solution. Could you re-post the patch with this
> change?
>

Yes, I'll change the patch.
Thanks for your replay.

>>
>> --- a/kernel/gcov/gcc_4_7.c 2016-05-16 00:43:13.000000000 +0200
>> +++ b/kernel/gcov/gcc_4_7.c 13:41:41.726666665 +0200
>> @@ -18,7 +18,9 @@
>>  #include <linux/vmalloc.h>
>>  #include "gcov.h"
>>
>> -#if __GNUC__ == 5 && __GNUC_MINOR__ >= 1
>> +#if __GNUC__ == 6
>> +#define GCOV_COUNTERS 10
>> +#elif __GNUC__ == 5 && __GNUC_MINOR__ >= 1
>>  #define GCOV_COUNTERS 10
>>  #elif __GNUC__ == 4 && __GNUC_MINOR__ >= 9
>>  #define GCOV_COUNTERS 9
>>
>> Regards
>> Florian Meier
>>
>
> --
> Peter Oberparleiter
> Linux on z Systems Development - IBM Germany
>