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bug#9316: AIX and JNI: *.so versus *.a
From: |
Daniel Richard G. |
Subject: |
bug#9316: AIX and JNI: *.so versus *.a |
Date: |
Wed, 17 Aug 2011 17:58:26 -0400 |
Hello,
I am using Libtool 2.4 to build Java JNI modules on AIX.
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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- bug#9316: AIX and JNI: *.so versus *.a,
Daniel Richard G. <=