Re: [Qemu-devel] [PATCH v1 10/10] linux-user: add gcov support to preexit_cleanup

["Alex Bennée" <alex.bennee@linaro.org>]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> Hi Alex,
>
> On 06/25/2018 08:19 AM, Alex Bennée wrote:
>> As we don't always take the normal exit path when running a guest we
>> can skip the normal exit destructors where gcov normally dumps it's
>> info. The GCC manual suggests long running programs use __gcov_dump()
>> to flush out the coverage state periodically so we use that here.
>
> Shouldn't we also check for this symbol in the ./configure script?

Sure - I couldn't find it exported anywhere - just mentioned in the
documentation. I think it has been there a while though.
>
>>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>
>> ---
>>  linux-user/exit.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/linux-user/exit.c b/linux-user/exit.c
>> index aed8713fae..14e94e28fa 100644
>> --- a/linux-user/exit.c
>> +++ b/linux-user/exit.c
>> @@ -19,10 +19,17 @@
>>  #include "qemu/osdep.h"
>>  #include "qemu.h"
>>
>> +#ifdef CONFIG_GCOV
>> +extern void __gcov_dump(void);
>> +#endif
>> +
>>  void preexit_cleanup(CPUArchState *env, int code)
>>  {
>>  #ifdef TARGET_GPROF
>>          _mcleanup();
>> +#endif
>> +#ifdef CONFIG_GCOV
>> +        __gcov_dump();
>>  #endif
>>          gdb_exit(env, code);
>>  }
>>


--
Alex Bennée