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Re: Cygwin GCC & JNI??
- From: Alan Thompson <athompson at alphatech dot com>
- To: <jim at iconnextion dot com>, <cygwin at cygwin dot com>
- Date: Mon, 17 Feb 2003 23:00:49 -0800
- Subject: Re: Cygwin GCC & JNI??
>Jim - Try the following solution. it worked for me. Write back if it doesn't work and I'll generate a more explicit example from my ant build script.
>From: "Mike Bresnahan" <firstname.lastname@example.org>
>Subject: RE: Using cygwin and JAVA/JNI
>Date: Wed, 5 Feb 2003 22:52:17 -0800
>I have been using Cygwin GCC 3.2 to build JNI DLLs that use <iostream>
>without difficulty. I have done the following things:
>- put -mno-cygwin -D_REENTRANT -D_GNU_SOURCE -D__int64="long long" on the
>compiler command line
>- put -mno-cygwin -Wl,--add-stdcall-alias on the linker command line
>See the Cygwin FAQ at http://cygwin.com/faq/faq.html for info
>> -----Original Message-----
>> From: email@example.com [mailto:firstname.lastname@example.org]On Behalf
>> Of Alan Thompson
>> Sent: Wednesday, February 05, 2003 8:18 PM
>> To: email@example.com
>> Subject: Using cygwin and JAVA/JNI
>> >Hi all - I have been doing some JNI stuff to integrate our
>> legacy software, and I have had very good luck following the
>> examples at http://www.inonit.com/cygwin/jni/helloWorld/ . The
>> only twist is that I've been using g++ instead of gcc, which
>> simplifies the non-java part.
>> >Here's a question, though: I cannot for the life of me figure
>> out how to use the C++ <iostream> in any of the code! For some
>> reason, the "-mno-cygwin" flag kills the ability of g++ to either
>> compile or link any code referring to <iostream>. This means one
>> is stuck using good old printf(), instead of the more modern way.
>> No matter how I break up the complies, it still fails at the
>> linking stage (when -mno-cygwin is still required, according to
>> my experiments).
>> >Does anyone have any ideas? Also, I've been unable to find any
>> documentation on the -mno-cygwin flag in the gcc/g++ man pages.
>> Can anyone point me to where this comes from and/or is documented?
>> >Thanks again for all of the help,
>> >Alan Thompson
>> >P.S. I've been using Cygwin for quite a while now ant it's
>> fantastic when you're chained to a windoze machine....
At 02:24 PM 2/17/2003 -0500, Jim Marshall wrote:
>Sorry if this is a dup, I hit send on the previous message too soon...
> First, I'm fairly new to gcc so if this isn't the right list
>plese direct me to the correct one.
> I have some code which compiles a shared object, it compiles fine
>on Red Hat 8 and even on Solaris for Intel. I'm now attempting to
>compile this same code of Windows XP using Cygwin. This shared
>object calls functions in the java VM (jvm.dll on windows). When I
>compile on Windows I get an error stating that it can't find the
>function JNI_GetCreatedVms function. I'm sure that has to do with
>the way the jvm.dll is compiled n windows and the calling
>convention, but I can;t figure it out. I've looked for the past
>two days and havn't found that much. can anyone lend me a helping
>hand? I have search teh web and found several sources of info
>(inonit.com etc..) but none have solved my problem.
>I'm using g++ 3.2 20020927 (prerelease) which came with
>cygwin (I downloaded cygwin last week). Here is the command I am
>passing to g++ ad the output:
>g++ -Wl,--add-stdcall-alias -mno-cygwin -I. -I../common
>-shared -o Tool.dll Tool.cpp -Lc:/cygwin/usr/java/lib -ljvm
>reference to `_
>reference to `_
>make: *** [NPITool.dll] Error 1
>I needthe DLL to compile with no dependency on cygwin, hence the
>-mno-cygwin. The -Wl,--add-stdcall-alias is something I just added
>after reading information at
>it was just -Wall.
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