Re: Compiling jar file using gcj

[Andrew Haley <aph at redhat dot com>]

Swapnil Jain wrote:
> i am attaching the RXTXcomm.jar that i use
> 
> 
> 
> 
> --------------------------------
> Swapnil Jain
> Indore
> -----------------------------------------------
> 
> 
> 
> On 31-Aug-09, at 4:52 PM, Andrew Haley wrote:
> 
>> Swapnil Jain wrote:
>>> i am using ubuntu 9.04 32 bit desktop edition.
>>>
>>> gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3
>>> gcj (Ubuntu 4.3.3-5ubuntu4) 4.3.3
>>> java version "1.6.0_14"
>>> Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
>>>
>>> i created a java project using netbeans. it uses 2 libraries
>>> RXTXcomm.jar & mysql-connector-java-5.1.7-bin.jar
>>>
>>> after building the project thru netbeans i get the iRemote.jar file in
>>> the dist folder.
>>>
>>> i want to compile it using gcj to create a binary file. i am using the
>>> following command
>>>
>>> gcj -o iRemote.sh --main=iremote.controller.Controller
>>> --classpath=RXTXcomm.jar:mysql-connector-java-5.1.7-bin.jar: iRemote.jar
>>> RXTXcomm.jar mysql-connector-java-5.1.7-bin.jar -v
>>>
>>> i am getting a segmentation fault error (file attached)
>>>
>>>
>>> i am also attaching strace of gcc & gcj
>>>
>>>
>>> kindly let me know if any more information you need.
>>
>> All files.  I need to know how to get the exact same versions you
>> are using.  Of course, this includes RXTXcomm.jar.

You have run into a bug where gcj gets very confused if the same file occurs
more than once on the command line.  I need to look at a way to detect this
and abort with an error message instead of segfaulting.

I cannot compile your example because a chunk of native code seems to be
missing from RXTXcomm.  You need to find this.

However, once you find the native code for RXTXcomm, something like

<compile the RXTX native code to native.o>
gcj -c RXTXcomm.jar -o RXTXcomm.o
gcj -c --classpath=RXTXcomm.jar iRemote.jar -o iRemote.o
gcj --main=iremote.controller.Controller native.o RXTXcomm.o iRemote.o

should work.

Andrew.