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From:	"David P. Caldwell" <inonit AT inonit DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	JNI/gcc problem (solved)
Date:	Tue, 8 Jan 2002 16:02:06 -0500
Message-ID:	<JIEPJODHFFPGJDGMCPBECEFDCHAA.inonit@inonit.com>
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Thanks to Chuck Wilson:

In order for this to work, the --add-stdcall-alias option has to be passed
to the linker on the gcc command line.  So, referring to
http://www.inonit.com/cygwin/jni/helloWorld/c.html, the gcc command line
would need to be changed to:

gcc -mno-cygwin -I$jdk/include -I$jdk/include/win32 -Wl,--add-stdcall-alias 
-shared -o HelloWorld.dll HelloWorld.c

I'll update the online version of the tutorial as soon as I can.

-- David.
David P. Caldwell wrote:

> I was having trouble figuring out how to build Java/JNI programs with
> Cygwin.  There were a number of threads in the mailing list about it, and
> some were helpful, but it still took a great deal of slogging.
>
> After I got it working, I put a tutorial on the web
> (http://www.inonit.com/cygwin/) on how to do it.
>
> If you are an expert on these matters (and don't feel like reading the
> tutorial), one question came up.  I was unable to link my examples into
DLLs
> using gcc.  (Or, more properly, I was able to link it into a DLL, but the
> Java virtual machine would invariably complain that the function it was
> looking for did not exist.)  I ended up using LCC-Win32.  There's some
more
> information about what occurred (and my cygcheck -s output) at
> http://www.inonit.com/cygwin/jni/helloWorld/c.html.


I don't have Java installed on this machine so I can't test this myself.
  But, try the following additional options to gcc:

-Wl,--export-all-symbols

If that doesn't work, then try again with the above option, but in addition:

-Wl,--add-stdcall-alias

Does any of that help?

--Chuck


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