Re: libjava configure error

[Andrew Haley <aph at redhat dot com>]

Bryan Smant writes:
 > On Tue, 2004-08-17 at 04:30, Andrew Haley wrote:
 > > Tom Tromey writes:
 > >  > >>>>> "Bryan" == Bryan Smant <bryan@stg.com> writes:
 > >  > 
 > >  > Bryan> I am trying to build a cross compiler tool chain targeting eCos
 > >  > Bryan> running on an ARM7 processor. When I compile libjava with the
 > >  > Bryan> --with-ecos option, I get the following error message:
 > >  > 
 > >  > The eCos support has bit-rotted over the years.  Also, it was never
 > >  > truly complete, for instance we had a vague plan to let eCos'
 > >  > configurability influence the native parts of libgcj, but that was
 > >  > never implemented.
 > >  > 
 > >  > Bryan> ../../../../src/gcc-3.3.4/libjava/java/io/natFileEcos.cc: File not found
 > >  > 
 > >  > Bryan> Has anyone out there actually built libjava for eCos successfully? Is
 > >  > Bryan> there a work around, or will I have to write my own version of the file?
 > > 
 > > I've done it, and it did work.  However, I never got eCos's thread
 > > support working, and support for files was very rudimentary.
 > 
 > Thanks for the information. Do you know what is would take to implement
 > the threading support for eCos? I eventually need to get threads,
 > sockets, and the javax.comm API for serial ports working. I know that
 > the serial stuff is not included, and I am working on a port for that.
 > Are sockets supported for eCos?

OS functions are concentrated in a few files, and making an eCos
version should be easy enough.  If I had to do it I'd probably
allocate a small number of weeks, given a working eCos environment.
On the other hand, I may be the only person in the world who knows
both gcj and eCos!  :-)

Sockets is a matter of writing an eCos version of natInetAddress,
natNetworkInterface, gnu/java/net/PlainSocketImpl, and
gnu/java/net/PlainDatagramSocketImpl.  There are Windows and GNU/Linux
versions in libjava/java/net.  However, eCos claims to have a "POSIX
compatible API" so it's possible that you could use the POSIX versions
we use with GNU/Linux.

eCos has both native threads and, I believe, POSIX threads.  Again,
you might be able to reuse the POSIX threads stuff we use with
GNU/Linux, but I wouldn't bank on it.  Maybe better to use eCos native
threads.

You'd want to be able to attach the eCos debug output stream to
System.err.

I'm not familiar with javax.comm.

Andrew.