Re: [Mingw-users] JNI with gcc

[Allann J. <all...@gm...>]

On Mon, Nov 26, 2012 at 9:54 AM, Earnie Boyd
<ea...@us...>wrote:

> On Sun, Nov 25, 2012 at 6:12 AM, Philipp Kraus wrote:
> > Hello,
> >
> > I try to build a shared library under MinGW (with g++) for using a JNI
> calls.
> > I have found this information http://www.mingw.org/node/41 but I can
> build the DLL, but the JNI call does not work.
> > I get the error "unsatisfied link error". I have checked with procmon,
> if all depend DLLs are found, and alls DLLs
> > are found, so IMHO the problem is the "native call / function name".
> >
> > I'm using the JDK 7 and Swig for generating Java classes & C++ codes.
> The function names within the DLL are:
> > Java_packagename1_packagename2_classnamewithJNIfunction_functionname@
> >
> > The define _JNI_IMPLEMENTATION does not change anything, also the
> --kill-at on the linker command. I'm using
> > g++ 4.7.0 under the MSYS shell.
> >
> > Can anybody send me a tip to solve the problem. IMHO the JRE does not
> find the correct function within my DLL.
>


Hi. This is a minimal example that is compiling and working on
MinGW (updated) at here. Please, modify the paths accordingly.



>
> Do you create a .def file?  You can create a .def file from the gendef
> package (see
> http://mingw.git.sourceforge.net/git/gitweb.cgi?p=mingw/mingw.org-tools;a=tree
> )
> for the source, we're not distributing it yet but it does build.
> You'll need autoconf to create the configure script.  Or you can
> create the .def during the build of the DLL with linker option
> "--output-def <FILE>".
>
>