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Sender: "Team Ada: Ada Advocacy Issues (83 & 95)" <[log in to unmask]>
From: Jeff Creem <[log in to unmask]>
Date: Mon, 20 Nov 2000 06:50:51 -0500
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Reply-To: Jeff Creem <[log in to unmask]>
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> So what is the difference between "registering files" and "importing
> subsystems/views" from an Ada source code perspective? Very little it
> seems. I haven't used Apex, but how does it handle multi-compilation unit
> Does it have the same restrictions as GNAT (i.e. one compilation unit per
> If this is true, then I would guess that the Apex mechanism is not that
> different to the ada-mode mechanisms for Projects using Emacs and GNAT.
> John

Importing subsystems/views is closer to having a default set of -I lines
to gnatmake (include path) on a per directory basis (this is a
simplification of
the power of subsystems/views but it is the best analogy).
Apex requires one compilation unit per file and also requires that files
follow a
specific naming convention. The big difference between the models is that
Apex holds onto
ASIS and/or other tree data after the compile so that it can be used later
by other
tools (or during other compiles).  This lets them avoid having to re-parse
all the with'd
specs of a file. As to whether or not this is faster than the GNAT
model......Not even close up
to version 3.0.0b (I have heard that the 3.2 series is faster).