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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT on WinXP: System.OS_Lib.Spawn raises Program_Error
Date: Sun, 3 May 2009 03:33:18 -0700 (PDT)
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Date: 2009-05-03T03:33:18-07:00
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On May 2, 11:01=A0pm, "Ed Falis" <fa...@verizon.net> wrote:
> On Sat, 02 May 2009 16:39:57 -0400, anon <a...@anon.org> wrote:
> > GNAT.OS_LIB existed in GNAT 3.15p =A0but since GNAT 2005 it have been
> > moved to System.OS_LIB. =A0And the GNAT.OS_LIB just renames System.OS_L=
IB
> > which makes this package a legacy for older projects and can be avoided=
 =A0
> > for
> > future use. It just causes more work for the compiler which increase th=
e
> > compile time.
>
> You're wrong. =A0GNAT.OS_Lib is the intended interface for users (normall=
y =A0
> you will get a warning about using an implementation unit subject to =A0
> unpredictable change if you use System.OS_Lib). =A0GNAT.OS_Lib is an =A0
> implementation-defined unit provided to users. =A0That it is a renaming o=
f =A0
> System.OS_Lib is irrelevant (and also does not cause any noticable =A0
> compilation overhead).

With GCC 4.3.3 on Mac OS X,

$ gnatmake -f -gnatwaL test
gcc -c -gnatwaL test.adb
test.adb:7:03: warning: "Program_Name" is not modified, could be
declared constant
gnatbind -x test.ali
gnatlink test.ali
gnatlink: warning: executable name "test" may conflict with shell
command

So no warning about implementation-defined units there (I have seen
them, though).