bug#9316: AIX and JNI: *.so versus *.a

[Peter O'Gorman]

On Aug 17, 2011, at 4:58 PM, Daniel Richard G. wrote:

> Hello,
> 
> I am using Libtool 2.4 to build Java JNI modules on AIX.

Hi,

If you add -Wl,-brtl to LDFLAGS at configure time, libtool will build plain 
.so's

Peter


> 
> I've noticed that on AIX, a shared library is initially built as an .so
> file via "gcc -shared", but then this .so is packed up into an .a file
> using ar(1). This is the case even if -export-dynamic -module is
> specified.
> 
> When I go to use these JNI modules, however, the JRE makes very clear
> that it doesn't like .a files:
> 
> Exception in thread "main" java.lang.UnsatisfiedLinkError: jni_test (    
> 0509-022 Cannot load module /tmp/jni/libjni_test.a.
>        0509-103   The module has an invalid magic number.)
>        at java.lang.ClassLoader.loadLibraryWithPath(ClassLoader.java:994)
>        at 
> java.lang.ClassLoader.loadLibraryWithClassLoader(ClassLoader.java:958)
>        at java.lang.System.loadLibrary(System.java:453)
>        at com.example.jnitest.JniTest.<clinit>(JniTest.java:21)
>        at java.lang.J9VMInternals.initializeImpl(Native Method)
>        at java.lang.J9VMInternals.initialize(J9VMInternals.java:196)
>        at JniTest.main(JniTest.java:56)
> 
> If I extract the .so files from the .a files, however, the JRE happily
> uses those. Currently, I am using an install-exec-hook rule to perform
> this step during "make install". There does not appear to be a Libtool
> option to skip the use of ar(1), which would be a preferable approach.
> 
> 
> --Daniel
> 
> 
> -- 
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> 
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--
Peter O'Gorman
http://pogma.com