From: lutz@iks-jena.de (Lutz Donnerhacke)
Subject: Re: How to rename a file?
Date: Fri, 28 Sep 2001 07:39:08 +0000 (UTC)
Date: 2001-09-28T07:39:08+00:00 [thread overview]
Message-ID: <slrn9r8a8r.kv.lutz@taranis.iks-jena.de> (raw)
In-Reply-To: mailman.1001648485.22108.comp.lang.ada@ada.eu.org
* David Botton wrote:
>Ada arrays are passed as C arrays do to the import so the use of String is
>valid, we just need to Zero terminate. Ada record types are also passed as
>pointers, which makes life a lot easier.
There is no guarantee AFAIK. Even GCC (not to mention Ada) has different
ways to do this. Therefore I prefer passing Interfaces.C.Strings.char_p over
Interfaces.C.char_array over Standard.String. Especially, if you look how
Standard.String is implemented: As a small struct, passable in registers or
as a pointer to this struct. In the latter case your C-function may assume
the pointer to the memory area containing the string values and the bounds.
-fpcc-struct-return
Use the same convention for returning struct and
union values that is used by the usual C compiler
on your system. This convention is less efficient
for small structures, and on many machines it fails
to be reentrant; but it has the advantage of allow�
ing intercallability between GCC-compiled code and
PCC-compiled code.
-freg-struct-return
Use the convention that struct and union values are
returned in registers when possible. This is more
efficient for small structures than
-fpcc-struct-return.
If you specify neither -fpcc-struct-return nor
-freg-struct-return, GNU CC defaults to whichever
convention is standard for the target. If there is
no standard convention, GNU CC defaults to
-fpcc-struct-return.
next prev parent reply other threads:[~2001-09-28 7:39 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-27 19:43 How to rename a file? Pi
2001-09-27 23:09 ` tmoran
2001-09-27 23:36 ` Larry Kilgallen
2001-09-28 2:16 ` DuckE
2001-09-28 2:54 ` Pi
2001-09-28 3:41 ` David Botton
2001-09-28 7:39 ` Lutz Donnerhacke [this message]
2001-09-28 17:34 ` Pascal Obry
2001-09-28 18:39 ` Larry Kilgallen
2001-09-30 1:51 ` David Botton
2001-09-30 8:53 ` Pascal Obry
2001-09-30 10:21 ` Florian Weimer
2001-09-30 14:53 ` Pascal Obry
2001-09-29 5:02 ` DuckE
2001-09-28 3:16 ` David Botton
2001-09-28 16:03 ` Jeffrey Carter
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