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Now this topic came back to my attention. So before we will start
our work I want to ask some questions.
Did in the meantime perhaps somebody already started to add QNX as a
target?
No change on that front afaik.
Would somebody be interested to do it together?
I (and others) have ported Unix targets before. Most of us hang out on irc.freenode.net channel #fpc, and can answer questions etc. I'm not aware of somebody actively working with or on QNX.
Can somebody make an estimation (in man month) how long it could
take?
A skilled person could probably do a basic port to a unix target in a handful of evenings.
I have no QNX experience but use Linux privately and heard that
QNX is relative similar to Linux.
It is unixy yes. But (see below)
Peter Vreman suggested in the old
mail to look into solaris/sunos post. Is this statement still valid?
What is the most similar supported target?
... better copy from more recent Unix ports that are not as evolutionary burdened as the Linux port. So I agree mostly with Peter to have a look at the Sunos port.
How would you start? Try to create a native QNX FreePascal or create
a cross compiler version supporting QNX?
Take a copy of the sunos RTL, and start translating updating/checking that code (constants and structures mostly). Then crosscompile, but not link. Maybe don't even assemble. (-Aas -s) Then transfer all files to QNX, and perform assembling and linking there. (to exclude possible problems with crosslinking/compiling and e.g. mandatory binary identifiers). Later you can verify crosslinking also works, but in the beginning it only adds a possible vector where something can go wrong and can add confusion ).
If you don't have a target yet, temporary modify an existing target (or choose one that matches). If you have a working port, we can talk about adding the target, but that is not necessary in the first stages.
Don't forget to read the buildfaq
(
http://www.stack.nl/~marcov/buildfaq/buildfaq.html or http://www.stack.nl/~marcov/buildfaq.pdf )
for the necessary background info
In the later case can the cross compiler run on Windows or
should it run on Linux?
An unix works faster, but Windows is possible. Specially if you don't crossassemble and crosslink, and thus don't need cross-binutils.
In the forum Carl Eric Codere in 2004 offered to help. Carl, are you
still reading this list?
Carl wanders in from time to time (often years apart), but generally isn't active within FPC anymore since probably the 2003-2004 timeframe.
