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From: "Thomas X. Hoban" <thoban AT verbalogic DOT com>
To: <cygwin AT cygwin DOT com>
Subject: Linking with JNI Invoke Using Cygwin gcc
Date: Thu, 5 Jun 2003 16:21:18 -0500
Message-ID: <DLEPIMCBMLJEPMIPNAEDOEFOCAAA.thoban@verbalogic.com>
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I have written a DLL and a test program that uses the JNI api to invoke a
JVM.  When I try to link with a test program, I get an error indicating that
a reference to __imp__JNI_CreateJavaVM AT 12 is undefined.

$ export JAVA_HOME=/cygdrive/c/j2sdk1.4.1_02
$ g++ -c –I$JAVA_HOME/include –I$JAVA_HOME/include/win32 JavaGateway.c++
$ g++ -I$JAVA_HOME/include –I$JAVA_HOME/include/win32 –L$JAVA_HOME/lib \
-ljvm JavaGateway.o -o testGateway testGateway.c++

The link command above produces these errors:

JavaGateway.o(.text+0x171):JavaGateway.c++: undefined reference to
`__imp__JNI_CreateJavaVM AT 12'
JavaGateway.o(.text+0x251):JavaGateway.c++: undefined reference to
`__imp__JNI_CreateJavaVM AT 12'
collect2: ld returned 1 exit status

I assume that the jvm.lib file provided with the sdk was compiled with MS
VC++.  Does the cygwin gcc compiler massage the symbol references
differently from MS?  Does anyone have a suggestion on how I can make this
work?

Thanks,

Tom


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