Re: i370 port - constructing compile script

["Paul Edwards" <mutazilah at gmail dot com>]

> > Would you be able to give me the two suggested configure
> > commands so that I can find out the answer to the above, one
> > way or another?
>
> For step 2 (building the cross-compiler), you'd need something
> along the lines of
>
> .../configure --target=i370-mvs --prefix=... --with-sysroot=...  \
>               --enable-languages=c
>
> where prefix points to the directory where the cross-compiler
> should be installed, and sysroot points to the directory where
> the MVS libraries and header are installed.

I tried to action this today.

But first I tried to get the normal make process working, ie without
the --prefix and --with-sysroot above, and just using defaults.  I had
some surprising success, but also one failure.

The failure (on 3.4.6, but not on 3.2.3) is that after the successful
build, when I do an xgcc -S, it produces the assembler file, and then 
hangs.  I traced this to gcc.c which was in a loop doing this:

pid = pwait (commands[i].pid, &status, 0);

getting a return of 0 all the time, while the process (cc1) that it is
waiting on is showing up as being <defunct>.

Not sure what that is about.  I have gcc 3.2.3 working without that
problem, so I'll spend some time comparing how the two pexecutes
work differently.

Of course I don't have system-related problems like this on MVS,
because I have a single executable and a simple function call.  :-)

In the meantime, I have a question.  You said above that I have to
point sysroot to the MVS libraries and headers.  What libraries?
And why, at the point of building a cross-compiler, do I need any
of those things?  The normal way I build a cross-compiler I just
do the above configure without prefix or with-sysroot, and it
builds an xgcc executable as expected, using the Linux headers,
as expected.

I would certainly like an option to force it to use my C90-only
Linux headers and my C90-only libraries, but that should be
strictly optional, and if I did do that, I would expect to see
configure saying things like "no you don't have fork, or getrusage,
or sys/types" etc etc.

I think I am still failing to understand some major aspect of the
build process.

BFN.  Paul.