<AWT Dev> Fix for JDK-8074829 : Resolve disabled warnings for libawt_headless

[Phil Race]

+1 given your off-list confirmation that JPRT built all combinations of 
platforms it can ..

-phil.

On 04/28/2016 05:44 AM, Ajit Ghaisas wrote:
> Hi,
>
>       I tried excluding files under directory : jdk/src/java.desktop/share/native/common/java2d/opengl from libawt_headless.
>       It resulted in compilation errors - as the headers in this directory (and under sub-directory J2D_GL) are used in other places.
>       
>       To Phil's question on - why I mentioned only OGLBlitLoops.c file? - this is the file where warning is reported and build stopped.
>       
>       Hence, I propose not to remove the suppression of warning E_EMPTY_TRANSLATION_UNIT  in make file for Solaris.
>       There is no change in original webrev : http://cr.openjdk.java.net/~aghaisas/8074829/webrev.00/
>
>       Based on Erik's suggestion, I have built it for arm and arm64 with no errors.
>
> Regards,
> Ajit
>
> -----Original Message-----
> From: Phil Race
> Sent: Friday, April 22, 2016 1:43 AM
> To: Ajit Ghaisas
> Cc: Sergey Bylokhov; 2d-dev; build-dev at openjdk.java.net
> Subject: Re: <AWT Dev> Fix for JDK-8074829 : Resolve disabled warnings for libawt_headless
>
>   >  Another solution is to exclude this file from HEADLESS compilation.
>   >  I am not sure how to achieve it. Any suggestion?
>
> I suppose that is possible and I expect we can do that See in the make file, where I think you just need to add entries to
>       LIBAWT_HEADLESS_EXCLUDES := medialib
>
> although I have not tried it.
> Hmm .. I wonder why medialib needs to be explicitly excluded from headless ? .. but that is for another day.
>
> I have another question: why do you mention only OGLBlitLoops.c ?
> I've flicked through a number of the C files in the same location and all look to have the same issue.
>
> -phil.
>
> On 04/21/2016 06:33 AM, Ajit Ghaisas wrote:
>>>> On 04/20/2016 12:27 PM, Sergey Bylokhov wrote:
>>>> 2d-dev added.
>>> In fact all these are 2D. No AWT warnings here.
>>>> I am not sure but why "declaration in the code" is a bad thing and
>>>> we should fix it?
>>>> - DISABLED_WARNINGS_solstudio := E_DECLARATION_IN_CODE
>>>>
>>>> I cannot find the documentation in solaris studio for this warning.
>>> I don't mind fixing it if it is still an issue but does the current compiler actually complain about it ?
>>> The SS11 -> SS12 upgrade might have got a more modern C compiler ..
>> [Ajit ] Yes. The Solaris compiler still complains about this declaration in code. Hence, I have fixed the reported warnings after removing the suppression from makefile.
>>
>>>> On 20.04.16 11:57, Ajit Ghaisas wrote:
>>>>> Hi,
>>>>>
>>>>>        Bug : https://bugs.openjdk.java.net/browse/JDK-8074829
>>>>>        This bug is to remove warning suppressions from makefile and
>>>>> fix the warnings for libawt_headless library.
>>>>>
>>>>>        I have removed following warning suppressions & fixed the
>>>>> warnings for libawt_headless library.
>>>>>        DISABLED_WARNINGS_gcc := maybe-uninitialized
>>>>> int-to-pointer-cast
>>> What made that one go away ??
>> [Ajit]  :  I fixed warnings reported for 'maybe-uninitialized' and 'E_DECLARATION_IN_CODE' warning types in two .c files in webrev.
>> There was no warning after removal of 'int-to-pointer-cast' suppression from makefile. No code change was made for this type of warning.
>>
>>
>>>>>        DISABLED_WARNINGS_solstudio := E_DECLARATION_IN_CODE
>>>>>
>>>>>        Warning suppression that cannot be removed :
>>>>>        DISABLED_WARNINGS_solstudio := E_EMPTY_TRANSLATION_UNIT
>>>>>        This is due to the fact that -
>>>>> jdk/src/java.desktop/share/native/common/java2d/opengl/OGLBlitLoops
>>>>> .c file becomes empty file in case of HEADLESS mode compilation.
>>> Sigh .. there ought to be "informational" warnings as well as "risky practice" warnings and this should be in the former category.
>>> You could move something like the jni.h and jlong.h imports outside to see if that shuts it up.
>>> Not saying that is what we want to do but it would be interesting to check.
>> [Ajit] : Nope. Moving jni.h or jlong.h inclusions outside #ifndef HEADLESS did not help. We still get E_EMPTY_TRANSLATION_UNIT warning.
>> To get rid of this warning, there are suggestions to make a typedef - and not use it anywhere - but, I would rather keep the suppression in makefile than defining a typedef without actual usage.
>> Another solution is to exclude this file from HEADLESS compilation. I am not sure how to achieve it. Any suggestion?
>>
>>
>>> -phil.
>>>>>        Request you to review following webrev :
>>>>>        http://cr.openjdk.java.net/~aghaisas/8074829/webrev.00/
>>>>>
>>>>> Regards,
>>>>> Ajit