RFR: JDK-8149479: Fix compare.sh to have a clean baseline with COMPARE_BUILD

[Tim Bell]

Erik:

Looks good to me as well.

Tim

> Updated in place.
>
> /Erik
>
> On 2016-02-10 14:16, Magnus Ihse Bursie wrote:
>> On 2016-02-10 14:11, Erik Joelsson wrote:
>>> Hello Tim,
>>>
>>> New webrev: http://cr.openjdk.java.net/~erikj/8149479/webrev.02/
>>>
>>> I agree about 1, so I started looking at it. Got confused why any 
>>> changes to it didn't seem to have any effect until I realized the 
>>> docs are no longer compared, which is what that was added for. So I 
>>> fixed comparing of docs and reduced the sed expressions to what is 
>>> actually necessary today, which was much less.
>>>
>>> 2 was indeed a typo and it could have hidden compare failures in my 
>>> JPRT runs. Luckily, it was still clean.
>>>
>>> I also fixed the comment Magnus pointed out.
>> Almost, at least. ;-)
>>
>> You lost a colon:
>>
>> - # Syntax: COMPARE_BUILD=CONF=<configure options>:PATCH=<patch file>:
>> + # Syntax: COMPARE_BUILD=CONF=<configure options>:PATCH=<patch file>
>>
>>
>> If you just restore that colon, I'm fine with the new version.
>>
>> /Magnus
>>
>>>
>>> /Erik
>>>
>>> On 2016-02-10 07:13, Tim Bell wrote:
>>>> Erik:
>>>>
>>>>> Please review these fixes for compare.sh and the COMPARE_BUILD 
>>>>> flag for make.
>>>>>
>>>>> The rather new feature COMPARE_BUILD, which builds twice, applying 
>>>>> some kind of change between them, is really neat. Especially when 
>>>>> run through JPRT to check all platforms at once. The problem is 
>>>>> that compare.sh currently isn't clean on all these platforms. 
>>>>> There are also some special peculiarities particular to when JPRT 
>>>>> is running the build which confuses compare.sh.
>>>>>
>>>>> Given that COMPARE_BUILD uses the exact same output directory, and 
>>>>> JPRT sets the version-opt string to a fix value for both builds, 
>>>>> we should be able to achieve a clean and stable baseline for an 
>>>>> empty patch file. Which I now have.
>>>>>
>>>>> I also changed COMPARE_BUILD to fail the build when differences 
>>>>> are found and added an option to COMPARE_BUILD to disable failing.
>>>>>
>>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8149479
>>>>> Webrev: http://cr.openjdk.java.net/~erikj/8149479/webrev.01/
>>>>
>>>> 1) Regarding common/bin/compare.sh lines 336...341 and lines 
>>>> 344...349 in the new version - this is not directly related to 
>>>> 8149479 but I wish those regexes were only coded once. If they ever 
>>>> get out of sync the results will be puzzling.
>>>>
>>>> 2) make/InitSupport.gmk line 366 in the new version - typo? 
>>>> COMPARE_BUILD_FAILE is COMPARE_BUILD_FAIL elsewhere
>>>>
>>>> Looks good otherwise.
>>>>
>>>> Tim
>>>>
>>>
>>
>