[erlang-questions] Cross compiling R13B04 for MIPS CPU running linux works
Rickard Green
rickard@REDACTED
Tue Mar 2 22:54:44 CET 2010
2010/3/1 Matthias Lang <matthias@REDACTED>:
> Hi,
>
> R13B04 has brand-new support for cross-compiling. Big thanks to
> Rickard Green for tackling that ugly job.
>
> Compiling R13B for a MIPS-32 big endian CPU running linux worked first
> try (!), all I did was make an erl-xcomp file with three lines changed
> from the template:
>
> erl_xcomp_build=guess
> erl_xcomp_host=mips-linux
> CFLAGS=-Os
>
Always nice to hear that it works.
> Questions:
>
> 1. Do you want the erl-xcomp file I made?
>
> On one hand: I don't know of anyone else running Erlang on that
> CPU (an Au1000, which runs the control system on Corelatus' GTH
> hardware).
>
> On the other hand: the next person with a weird target would probably
> be happy to see that they're not setting off into "only OTP have
> done this" territory.
>
Yes, please. I think it's good with example configurations that people
can have a look at when creating their own configurations.
> 2. On targets where disk space is precious, it's nice if the .beams
> are compressed. On earlier releases, I did that that by including
> +compressed in ERL_COMPILE_FLAGS (by patching the makefile).
>
> Is there a better way to do that now?
>
> I had a quick look, couldn't find one, thought I'd ask before
> I invent my own method, possibly putting the .beams in an archive
> while I'm at it.
>
I haven't looked at this, but this is of course interesting for small
embedded systems.
I had a look in beam_lib and it seems that the strip_release/1
function also compresses the result, so invoking the following after
building the system should get you a slim system:
$ERL_TOP/bootstrap/bin/erl -noshell -noinput -eval
"beam_lib:strip_release(\"$ERL_TOP\"),init:stop()"
This will however remove the debug info too, which perhaps isn't what
you wanted. I think it would be nice to be able to add the +compressed
flag without having to patch the makefiles, so I'll try to have a look
at it before R14.
Regards,
Rickard
> Matt
>
>
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