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Showing content from http://mail.openjdk.java.net/pipermail/jdk8-dev/2013-April/002307.html below:

Define JNIEXPORT as visibility default with GCC?

Define JNIEXPORT as visibility default with GCC?David DeHaven david.dehaven at oracle.com
Fri Apr 12 08:22:36 PDT 2013
>> I totally agree that the current usage of JNIEXPORT in typedefs in AWT and 2D code is a bug.
>> 
>> My concern, however, is about other code that mistakenly adapted the same pattern. After this fix its compilation will fail.
>> 
> Yup.  Any code that was using JNIEXPORT inappropriately will fail to compile.
> All changes are incompatible changes.
> 
> But ... it's only a source incompatibility, only in native code, and trivial for users to fix. 
> (It would be even better if the semantics of JNIEXPORT were documented somewhere...)
> 
> Just like the JDK native code needs porting whenever a new release of gcc comes out.

Martin's right, this is a concern that's beyond our scope and the problem is easily solvable (the documentation issue aside..). Besides, it's going into 8 which will give it a chance to incubate before it gets out into the wild on production systems, right?

(and I have a patch that will depend on Martin's patch coming shortly... so anything to get this through will help :)

I did find at least a couple places in JavaFX 8.0 where it's being misused. Those should be easy to clean up though, I can file an issue and handle it. I haven't checked JavaFX 2.x yet, but that's not a concern until this gets backported.

-DrD-

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