From owner-freebsd-java  Fri Dec 31 18:27: 7 1999
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Date: Fri, 31 Dec 1999 20:27:00 -0600 (CST)
From: Tim Zingelman <tez@nova.fnal.gov>
Subject: Re: java JNI compile problems
In-reply-to: <386D454B.694B5093@1connect.com>
To: Keith Wong <keith@1connect.com>
Cc: freebsd-java@FreeBSD.ORG
Reply-To: Tim Zingelman <zingelman@fnal.gov>
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Keywords: java JNI gcc compile build shared undefined main lib library

To build a shared library you will want to use -fpic & -shared

% gcc -fpic -shared -g -I/usr/local/jdk1.1.8/include/
-I/usr/local/jdk1.1.8/include/freebsd HelloWorldImp.c
-o libhello.so

The -g just adds debug info... -fpic makes it position independent and
-shared makes it a shared library.  Also if you are running an older
(non-ELF) machine, you will need to add the -aout flag to build compatible
libraries.

 - Tim

On Fri, 31 Dec 1999, Keith Wong wrote:

> Hi All,
> I want to use the java JNI to integrated with C.  And, i tried to follow
> the example at the java.sun's website.  then I get the problem when I
> try to compile the shared the library using gcc -g, then i get the
> error.
> Keith
> 
> % gcc -g -I/usr/local/jdk1.1.8/include/
> -I/usr/local/jdk1.1.8/include/freebsd HelloWorldImp.c
> -o libhello.so
> /usr/lib/crt1.o: In function `_start':
> /usr/lib/crt1.o(.text+0x69): undefined reference to `main'



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