Re: [Swig-user] Java and -fvisibility=hidden in SWIG 1.3.29

[Bob M. <rma...@ee...>]

William S Fulton wrote:
> Bob Marinier wrote:
>   
>> Sorry, attached example.java instead of main.java.  Reattaching.
>>
>> Bob
>>
>> Bob Marinier wrote:
>>     
>>> I've been trying to use the new -fvisibility=hidden stuff to improve
>>> my libraries.  It works great in Tcl, but in Java it seems to fail at
>>> runtime when there's a static method in a class.  I've attached a
>>> simple example.  I do the following with it:
>>>
>>> $ swig -c++ -java example.i
>>> $ g++ -c -fpic -fvisibility=hidden example_wrap.cxx
>>> -I/opt/sun-jdk-1.4.2.10/include -I/opt/sun-jdk-1.4.2.10/include/linux
>>> $ g++ -shared  example_wrap.o -o libexample.so
>>> $ javac *.java
>>> $ java main
>>>
>>> This results in this error:
>>>
>>> Creating some objects:
>>> Exception in thread "main" java.lang.UnsatisfiedLinkError:
>>> Shape_CreateShape
>>>        at exampleJNI.Shape_CreateShape(Native Method)
>>>        at Shape.CreateShape(Shape.java:36)
>>>        at main.main(main.java:16)
>>>
>>> If I change -fvisibility=hidden to -fvisibility=default, then it works
>>> fine.
>>>
>>> I'm using g++ 4.1.1 on a Gentoo Linux system with SWIG 1.3.29.
>>>
>>>       
>
>
>   
>>>   
>>> ------------------------------------------------------------------------
>>>
>>> /* File : example.i */
>>> %module example
>>>
>>>       
>
> // Add this in here:
> %{
> #undef JNIEXPORT
> #define JNIEXPORT SWIGEXPORT
> %}
>
>   
>>> %{
>>> #include "example.h"
>>> %}
>>>
>>> /* Let's just grab the original header file here */
>>> %include "example.h"
>>>
>>>   
>>>       
>
> or use the CVS version. I've made the cvs version use SWIGEXPORT instead
> of JNIEXPORT for the generated JNI wrappers. I was a bit hesitant to
> make this change, so if anyone is using an unusual platform, post your
> definition of JNIEXPORT from jni.h or jni_md.h, so we can check for
> differences between SWIGEXPORT and JNIEXPORT. I've got linux, windows
> and solaris covered.
>
> William
>   
It works!  Thanks!

Bob