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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Bug or feature?
Date: Wed, 14 May 2014 18:35:05 -0400
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Date: 2014-05-14T18:35:05-04:00
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"Randy Brukardt" <randy@rrsoftware.com> writes:

> gnatmake 
> C457003.adb -eS -gnat12 -O0 -gnatE -gnato -gnatv -gnatws -gnatd7 -bargs - T0

Of those, only "-gnatE", "-gnato", and "-bargs -T0" are needed for
standards conformance.  And as I said, "-gnato" is no longer, or soon
will no longer be needed.

The above options are definitely not what the OP should be using.
For example, don't use -gnatE unless you are porting a large program
to GNAT and it won't work otherwise.

> Some of these are about warnings and disabling of optimizations, and of 
> course -gnat12 sets Ada 2012 mode (which I think is the default these days). 

Right, Ada 2012 is now the default.

> [B-Tests also need -gnatf and -gnatq, but that's not important to most since 
> they're not worried about broken programs.]
>
> I use that set of options anytime I'm compiling test programs from GNAT 
> (including the ones that appear here), because several of them are needed to 
> get standard behavior. GNAT's default behavior might be "better" in some 
> ways, but it's confusing because it doesn't necessarily do what you'll find 
> in an Ada book.

Yes, it is confusing.

- Bob