[e-lang] E-on-Java works with recent gcj

[Toby Murray]

Toby Murray wrote:

>I've now managed to get a binary up and 
>running that requires no special tweaking of classpath etc. at runtime.
>The binary also uses precompiled versions for classes (which are stored 
>in a shared library) when loading them at runtime, which increases the 
>start-time by about 10% over a version where everything has to be loaded 
>from bytecode.
>  
>
Err. Sorry, that should be "which decreases the start-time by about 10%". :)

>I've attached a Makefile that I was using to build this stuff. I had to 
>transcribe the Makefile from a hardcopy so it might have typos in it. 
>Hopefully  there's enough context to allow someone to fix typos in it etc.
>  
>
I've just done a quick check of that Makefile and found two typos. I've 
attached an updated version that also includes some comments, which I 
left-out of the original.

If anyone else can test this, that'd be great. It shouldn't require more 
than two one-line patches to the sources (as mentioned earlier) and then 
just a 'make -f Makefile.gcj' to build the thing. The binary will end up 
in BUILD/bin/ and be called 'e'.

One main issue is that you can't relocate some of the stuff in 
BUILD/lib, notably 'e.jar' and 'e.jar.so' and 'classmap.db'. This is 
because the binary has references to the full path to 'e.jar' and 
'classmap.db'. 'classmap.db' has a reference to the full path to 'e.jar.so'.
I think the usual trick that's used (at least in Fedora Core 5) is to 
have a /usr/lib/e/ directory, in which lives 'e.jar' and 'e.jar.so' and 
'classmap.db'. Then all full path references point to files in this 
directory. This seems to work OK for a redistributable installable 
package like an RPM and could be a potential option for an E RPM binary 
distribution.


-- 
Toby Murray
Advanced Computer Capabilities Group
Information Networks Division
DSTO, Australia

IMPORTANT: This e-mail remains the property of the Australian Defence
Organisation and is subject to the jurisdiction of section 70 of the
Crimes Act 1914. If you have received this e-mail in error, you are
requested to contact the sender and delete the e-mail.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.eros-os.org/pipermail/e-lang/attachments/20060815/4a4730eb/attachment.html 
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: Makefile.gcj
Url: http://www.eros-os.org/pipermail/e-lang/attachments/20060815/4a4730eb/attachment.pl