[Google] Fix profiledbootstrap failure

[Rong Xu]

Will do.

The patch was in gcc-4_7 by Dehao.

r194713 | dehao | 2012-12-24 16:49:06 -0800 (Mon, 24 Dec 2012) | 5 lines

Fix the profiled bootstrap:

1. Set the default value of gcov-debug to be 0.
2. Merge profile summaries from different instrumented binaries.

On Tue, Jul 30, 2013 at 12:58 PM, Xinliang David Li <davidxl@google.com> wrote:
> Ok. Rong, can you help commit the parameter default setting patch?
>
> thanks,
>
> David
>
> On Tue, Jul 30, 2013 at 12:48 PM, Rong Xu <xur@google.com> wrote:
>> We have seen the issue before. It does fail the profile boostrap as it
>> reads a wrong gcda file.
>> I thought it had been fixed. (The fix was as David mentioned, setting
>> the default value of the parameter to 0).
>>
>> -Rong
>>
>> On Tue, Jul 30, 2013 at 12:02 PM, Xinliang David Li <davidxl@google.com> wrote:
>>> I need to understand why this affects profile bootstrap -- is this due
>>> to file name conflict?
>>>
>>> The fix is wrong -- please do not remove the parameter. If it is a
>>> problem, a better fix is to change the default parameter value to 0.
>>>
>>> David
>>>
>>>
>>> On Tue, Jul 30, 2013 at 11:56 AM, Teresa Johnson <tejohnson@google.com> wrote:
>>>> cc'ing Rong and David since this came from LIPO support.
>>>>
>>>> The patch as-is removes the one use of PARAM_GCOV_DEBUG (which is on
>>>> by default) without removing the parameter itself. What is the failure
>>>> mode you see from this code?
>>>>
>>>> Thanks,
>>>> Teresa
>>>>
>>>> On Tue, Jul 30, 2013 at 11:50 AM, Dinar Temirbulatov
>>>> <dinar@kugelworks.com> wrote:
>>>>> Hello
>>>>>
>>>>> This change allows to complete profiledbootstrap on the google gcc-4.8
>>>>> branch, tested with make bootstrap with no new regressions.  OK for
>>>>> google 4.8?
>>>>>                    thanks, Dinar.
>>>>
>>>>
>>>>
>>>> --
>>>> Teresa Johnson | Software Engineer | tejohnson@google.com | 408-460-2413