Re: Segfault with trivial SWT snippet

[Andrew Haley <aph-gcc at littlepinkcloud dot COM>]

Carl Worth writes:
 > On Tue, 13 Nov 2007 13:26:10 +0100, Mark Wielaard wrote:
 > > On Tue, 2007-11-13 at 11:33 +0000, Andrew Haley wrote:
 > > > Try compiling with -findirect-dispatch -fpic.
 > >
 > > And since swt uses JNI for its native bindings, you might also need to
 > > add -fjni.
 > 
 > Andre and Mark,
 > 
 > Thanks for the help. The extra flags didn't solve the problem. But it
 > did encourage me to try another experiment. I found that even if I
 > used my System.out.println example with the compilation flags I was
 > using that I got the segfault.
 > 
 > So that made it simple to track down the problem to the following
 > linker flags:
 > 
 > 	-lswt -lswt-pi
 > 
 > I found that if I just remove -lswt-pi then everything works great. (I
 > have no idea what the intent of swt-pi might be---I had picked this up
 > from the output of "pkg-config --libs swt-gtk"). So I'll pass that bug
 > report on to the swt/Debian folks.
 > 
 > Anyway, I think I'm on my way now.

OK.

 > Oh, but by the way, I couldn't get things to link when passing the
 > -findirect-dispatch flag. I always got errors like:
 > 
 > 	gcj -I `pkg-config --variable=CLASSPATH swt-gtk`
 > 	-findirect-dispatch -fpic -fjni -c -o Snippet1.o Snippet1.java
 > 	gcj -lswt --main=Snippet1 -o Snippet1 Snippet1.o
 > 	/tmp/cceivJSw.o: In function `main':
 > 	ccUlWBRV.i:(.text+0x2b): undefined reference to `Snippet1::class$'

You seem to have forgotten about -findirect-dispatch -fpic !

Andrew.