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bug#9316: AIX and JNI: *.so versus *.a
From: |
Peter O'Gorman |
Subject: |
bug#9316: AIX and JNI: *.so versus *.a |
Date: |
Fri, 19 Aug 2011 22:55:45 -0500 |
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