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Date:	Tue, 12 Apr 2011 16:48:29 +0200
Message-ID:	<BANLkTikh=3DLDE7s-yVOYo=CZ6u9GNvfXw@mail.gmail.com>
Subject:	Re: 64bit (g)fortran JNI
From:	Kai Tietz <ktietz70 AT googlemail DOT com>
To:	mingw-w64-public AT lists DOT sourceforge DOT net
Cc:	Hans Horn <hannes AT 2horns DOT com>, cygwin AT cygwin DOT com
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2011/4/12 Hans Horn <hannes AT 2horns DOT com>:
> Folks,
>
> has anybody got any experience interfacing (g)fortran routines with Java via
> JNI?
>
> I'm on 64bit Windows7 using cygwin
> x86_64-w64-mingw32-gcc and x86_64-w64-mingw32-gfortran, both v4.5.2
>
> Java: jdk-6u24-windows-x64
>
> Even though I can statically link the JNI code successfully (using gfortran
> as linker), calling any native method from Java crashes the JVM - even when
> no fortran code is called at all.
>
> my compiler/linker flags are:
>
> gcc_opt = -O3 -std=c99 -DCYGWIN -Wl,--kill-at -mno-cygwin -shared
> -I${JAVA_HOME}/include/win32 -m64
>
> gfc_opt = -O3 -fno-underscoring -fno-f2c -W -Wunused -Wuninitialized -m64
>
> ld_opt = -luuid -lole32 -m64
>
>
> Any clues?
>
> Thx.,
> H.
>
>
> P.S. I'd posted this on the gfortran list, but the chaps there were too
> busy.

Hans,

this issues you see here might be reasoned by the gcc version you are
using. There is no SEH unwinding information generated for 4.5.2 gcc.
This feature was added to gcc 4.6.0 version for windows x64 target.
But it might help to use here -fno-omit-frame-pointer option.  At
least this helped me once to call JNI via Obj-C in a working way.

For x64 Windows releated target questions it would be better if you
are posting to mingw-w64's ML: I redirect this thread to this list.

Regards,
Kai

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