Re: compilation problems with ecj.jar

[Andrew Haley <aph at redhat dot com>]

Marco Trudel writes:
 > Andrew Haley wrote:
 > > Marco Trudel writes:
 > >  > Andrew Haley wrote:
 > >  > gcj: Internal error: Segmentation fault (program jc1)
 > >  > Please submit a full bug report.
 > >  > 
 > >  > Maybe I patched the wrong Makefile.am? I patched the one in the libjava 
 > >  > dir...
 > > 
 > > And you did run automake afterwards?
 > 
 > What is automake for? I tried to do a new gcj compilation.

It makes Makefile.in from Makefile.am.  See http://gcc.gnu.org/install/prerequisites.html.

 > I assume that will automatically use the new Makefile.am.

You do presume things.

 > >  >  >  > BTW,l there are more problems with compiling ecj.jar for
 > >  >  >  > cross-compiling. Creating a host-linux, target-windows GCJ will
 > >  >  >  > create a ecj.exe what is definitely the wrong thing to do.
 > >  >  >
 > >  >  > It's the right thing to do.  You have to build the ecj.exe for
 > >  >  > GNU/Linux as a separate step when building the GNU/Linux native
 > >  >  > compiler.  If you don't want ecj.exe for the target, don't include
 > >  >  > ecj.jar in the build tree.
 > >  > 
 > >  > What do I need a "exe" for on Linux?
 > > 
 > > It's a Windows executable that compiles .java -> .class.  If you're
 > > going to compile Java source on Windows, you'll need it.
 > 
 > But if I'd like to compile Java source on Windows, I would build a 
 > host=Windows target=Windows gcj. In my case, I have no use for ecj.exe 
 > since the a compilation happens on Linux.

As I said, If you don't want ecj.exe for the target, don't include
ecj.jar in the build tree.

 > > If you want to compile Java source on Linux, even if your target is
 > > Windows, you must build a Linux *native* compiler to get ecj.exe.
 > 
 > Isn't that somewhat senseless? If I only need a host=Linux 
 > target=Windows compiler, I also have to compile a host=Linux 
 > target=Linux gcj just to get my ecj and be able to compile .java source 
 > files on Linux?

Yes.

ecj is a program that is written in Java.

To run ecj you will need a native Java library.

This is obviously true regardless of the target.

 > But I get a ecj.exe for Windows that I don't need on Windows since my 
 > gcj only runs on Linux?
 > Where is the advantage of getting ecj for Windows?

So don't build it, then.

 > >  > If I get a ecj.exe, what can I do with it? I wont be able to
 > >  > compile .java files on Linux and its useless on Windows as far as I
 > >  > can see. But I'd be glad to learn better...
 > > 
 > > You need it for the Windows compiler.
 > 
 > Which Windows compiler?

The Windows native compiler.  If you don't intend to build a Windows
native compiler, then you won't need it.

Andrew.