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From: Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>
Newsgroups: comp.lang.ada
Subject: Re: Could you write a BSD like os in ADA?
Date: Sun, 28 Aug 2016 01:20:47 -0000 (UTC)
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Date: 2016-08-28T01:20:47+00:00
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On 2016-08-24, Jeffrey R. Carter <spam.jrcarter.not@spam.not.acm.org> wrote:
> On 08/24/2016 10:40 AM, Qun-Ying wrote:
>> 
>> GNAT has support for OpenVMS:
>> http://www.adacore.com/press/gnat-pro-now-available-for-hp-openvms-on-hp-integrity-servers/
>> 
>> 
>> Not sure if FSF GNAT could be cross compiled into VAX OpenVMS.
>
> DEC contracted with AdaCore (then ACT) to provide the DEC Ada-95 compiler. This
> is why GNAT recognizes all the DEC Ada(-83) pragmas, such as Passive.
>

That doesn't mean all the required bits have shown up in the FSF version
of the GCC codebase (don't forget AdaCore maintain their own codebase).

I've tried to build the FSF GCC for a VMS Alpha target and the attempts
failed both times I tried it. (The last attempt was with gcc 4.9.x).

You start with a Linux hosted gcc/binutils cross compiler toolchain
with a VMS target (so it produces VMS executables that can be directly
run on VMS.) The idea AFAICS is that you then use these executables to
build the compiler in native mode on VMS itself, but I never got that
far.

I was able to use the cross compiler to build some C programs which ran
on VMS, but Fortran code fell over at runtime either during the image
activation process or very shortly afterwards (I can't remember which).

Both the C++ and Ada frontends failed to build when building the
cross compiler (GNAT fell over with an ICE during the build and C++ was
some header problem IIRC).

Simon.

-- 
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world