On Saturday, 22 February 2020 at 13:20:40 UTC, IGotD- wrote:
I'm trying to find information how to port D, especially the D
runtime to a proprietary OS. The OS support seems to be
scattered around several files with a lot version (OS)
switches. This makes kind of hard to understand what you have
to implement. Also, what happens if you only have partial
support, for example networking is completely left out.
Will there be a future improvement of this so that OS specific
support can be moved to separate files and selected on module
level instead? For example.
void DSpecificLibraryFunction(...)
{
OSDependentLibraryFunction(...)
}
so that there are predefined OS specific functions that are
selected on module level. Also version() switches where
everything is consolidated into one file makes it more
difficult to merge.
Do we have any guide for OS porting?
Best place to start would be without druntime at all, just a
minimal object module, and extern(C) main, then work your way up,
introducing each module one at a time to make sure that it all
works.
There are a few core components that you need to port in order to
get things working, or at least, you need to isolate and verify
that it works, as if they don't then you'll get some very hard to
debug issues.
The two main ones to pay close attention to are rt.sections and
core.thread. If exception handling is not dwarf-based, then
you'll have to implement your own rt.deh too.
