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From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: GNAT listing file default names (was: Ada95 Strengths/Weaknesses)
Date: 1999/09/29
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In article <1999Sep29.074624.1@eisner>,
  Kilgallen@eisner.decus.org.nospam wrote:
> In article <7srmd7$2dr$1@nnrp1.deja.com>, Robert Dewar
<robert_dewar@my-deja.com> writes:
>
> > Listing file? what's that? Seriously, like most modern
compilers
> > GNAT does not provide an old style listing file. You can if
you
> > like ask for complete listing output, but this is generated
to
> > standard output, and is redirected as required (unlike the
> > situation in VMS, redirection of this kind is very simple in
> > Unix and DOS-like systems).
>
> To me /LISTING=[MYDIR.LISTINGS] doesn't seem complex, but we
digress.

You miss the point, the above VMS quote is NOT about
redirection, but about using a specific parameter. What I
was saying was that in Unix and DOS-like systems, redirection
is so easy that one tends to use it extensively. Since general
redirection is not nearly so easy in VMS, it is less used.

In GNAT, to get a "listing" file, we simply do

  -gnatl >mydir.listings

which is pretty straightforward ...

> Are you saying that if I issue whatever is the GNAT command
> for:
>
> 	"Recompile it all for production and give me a full
>        listing
> 	 for the permanent record of exactly what machine
>        instructions
> 	 shipped to customers for each source line."
>
> the listing from all compilation units ends up in a single
> file ?

Trivial commands can put this in one file, many files etc etc,
but the concept of a "listing file" as such is indeed an
antiquated one, and you will not in general find modern
compilers on modern systems providing this capability in
a VMS-like way -- yes, yes, we know, you *like* the VMS
capabilities in this area :-)

> Yes, I realize that for optimizing compilers the bit about
"for each
> source line" is incredibly difficult for a human to trace, and
one hopes
> to never need it, but it does happen.

A GNAT generated assembly file with embedded line number
information will indeed give you the information you need,
or alternatively you can use a tool like objdump to get
the information you need.



>
> Larry Kilgallen
>


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