compilation problems with ecj.jar

Mon Jan 15 19:35:00 GMT 2007

Andrew Haley wrote:
> [snip]
>> > > Nevertheless, this command does work for me, producing ecjx. It needs
> > > a lot of memory to compile, though. Perhaps you're running out of
> > > memory.
> > 
> > Yes, I think you're right. I tried a couple of times and sometimes got 
> > "virtual memory exhausted: Cannot allocate memory", even if I removed 
> > optimization. How much RAM do you have? I have 1gb RAM and 2gb swap. I'm 
> > somewhat surprised that that's not enough or at least not enough without 
> > optimization...
>> The compilation process peaks at about 1.5G of RAM on my system.

Strange, how can it then be that 3gb are not enough on mine?
> This
> really only bites on --disable-shared builds. To fix this you can
> either split the compilation into parts or replace ecjx with a simple
> shell script that launches ecj.

The second one seems interesting. Can you explain that further? I have 
no background knowledge of ecj. I would assume that you mean this:
- Compile gcj without the ecj.jar in the source dir (works)
- Create a script that launches ecj.jar, name it ecj and put it into the 
dir of gcj
- gcj will call it automatically for .java source input
Is this more or less correct?
thanks
Marco
PS: I'll try to compile a static GCJ with ecj.jar on a machine with 10gb 
swap. I'll report if that works...