[oe] [meta-java] gcc6 support breaks build for gcc < 6

[Khem Raj]

On Mon, Jul 11, 2016 at 6:19 AM, Otavio Salvador
<otavio.salvador at ossystems.com.br> wrote:
> Hello Dobbe,
>
> (Added Khem and Fabio on Cc)
>
> On Mon, Jul 11, 2016 at 8:37 AM, Winfried <winfried_mb2 at xmsnet.nl> wrote:
>> Commit  33ddb28a6428b02ddcc82d1954ecf27cd426fbb5 (openjdk-8: make GCC6
>> happy) adds gcc option -fno-lifetime-dse, which was added in gcc6. This
>> breaks the compilation of openjdk-native on hosts where gcc4 or gcc5 is the
>> default compiler.
>>
>> If this is intentional, I think the README file should mention that
>> meta-java requires gcc6. Better would be to add the '-fno-lifetime-dse'
>> option only if gcc >= 6 is used for native compilation (if that is
>> possible).
>
> This is a non-desired side effect of the patch. Daniel, could you take
> a look on this?

If you are not using default compiler then you have to take some action

add

CFLAGS_remove = " -fno-tree-dse"
CXXFLAGS_remove = " -fno-tree-dse"

via a .bbappend in your layer.

>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
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