Re: [Xen-devel] [PATCH v2 4/4] xen: make clear gcov support limitation in Kconfig

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 06/09/16 14:37, Jan Beulich wrote:
>>>> On 06.09.16 at 14:41, <wei.liu2@xxxxxxxxxx> wrote:
>> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> with one possible further request:
>
>> --- a/xen/Kconfig.debug
>> +++ b/xen/Kconfig.debug
>> @@ -33,6 +33,12 @@ config GCOV
>>         ---help---
>>           Enable gcov (a test coverage program in GCC) support.
>>  
>> +         Currently the data structure and hypercall interface are tied
>> +         to GCC 3.4 gcov format. You need to have a version of GCC
>> +         that is compatible with that format to make gcov work.
> Is it known up to which gcc version that format did get used? I ask
> because mentioning 3.4 when our minimum requirement is 4.1 now
> is a little odd. If the format had changed by 4.1, we may want to
> consider to make GCOV depend on BROKEN.

The GCC GCOV version is not the GCC Version.

GCC GCOV version 3.4 is used up until GCC 4.3 or 4.4 (can't remember
which).  The previous GCOV support in Xen definitely did function
properly with GCC 4.1.

~Andrew

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