On 2012-10-19 20:08, Johannes Pfau wrote:
Druntime might not need file access/etc as long as version(Posix) isn't
defined for your target.
Nobody has used GDC/D/druntime on a system without OS afaik. So you
have to pioneer ;-) I see two solutions:
There are developers who have used D1 to create an operating system, or
kernel.
http://wiki.xomb.org/index.php?title=Main_Page
https://github.com/xomboverlord/xomb
Last update, 4 months ago, I thought it was completely dead.
* Create your own, simple runtime library. There's no real
documentation on the minimum interface a runtime must implement (the
compiler calls back into the runtime), so this would be a little
tricky.
* Adjust druntime. You can probably throw out 90% of the druntime code
(core.sys.*). Make sure the basic code work with ansi C. Forget
about things like threading (core.thread, core.sync), those require
system specific code and can be implemented later on. Your biggest
problem is probably the GC and TLS. If your target libc supports
TLS, things should work just fine. If not, there's some additional
work waiting. You need to reimplement some functions for the GC (get
stack top/bottom...) which shouldn't be too difficult, but getting
the TLS range might be tricky, depending on your system.
You could also try to remove the GC completely, but the language
currently assumes that a GC is available (things like dynamic array
appending, ...). A proper -nogc switch which disables GC features
like array appending would be a solution, but nothing like this is
implemented yet, IIRC. (But I think there was some kind of --betterc
switch which could be a start?)
There are a lot of other features in D that depend on the runtime, which
one needs to be aware of.
--
/Jacob Carlborg
