From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,6b777a2e4fd60559 X-Google-Attributes: gid103376,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news1.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!wns13feed!worldnet.att.net!204.71.34.3!newsfeed.cwix.com!newsfeed.vmunix.org!newsfeed01.sul.t-online.de!t-online.de!newsfeed.velia.net!newsfeeder.dynfx.net!zen.net.uk!dedekind.zen.co.uk!peer.news.zetnet.net!easynet-quince!easynet.net!xara.net!gxn.net!194.159.246.34.MISMATCH!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!not-for-mail From: Simon Wright Newsgroups: comp.lang.ada Subject: Re: Only one Ada vendor? Date: Sat, 20 Oct 2007 08:39:37 +0100 Organization: Pushface Message-ID: References: <1192806306.892546.73350@q5g2000prf.googlegroups.com> NNTP-Posting-Host: pogner.demon.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: news.demon.co.uk 1192865981 29372 62.49.19.209 (20 Oct 2007 07:39:41 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Sat, 20 Oct 2007 07:39:41 +0000 (UTC) Cancel-Lock: sha1:ZqHn+ZHQr9OaoDI+pWIZ02aYld4= User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (darwin) Xref: g2news2.google.com comp.lang.ada:2511 Date: 2007-10-20T08:39:37+01:00 List-Id: "Nasser Abbasi" writes: > If this was say C or C++ code full of #ifdefs and each C compiler > having its own set of a million different compiler switches I would > understand, but Ada code? So I am just curious why would it be hard > to "switch" Ada compilers? Application code is very likely to depend on compiler-specific extensions and support packages; eg GNAT's 'Unrestricted_Access and GNAT.Sockets. You might say 'so make your own socket binding', but our experience is that that will support an imperfect subset of the underlying library; for example, not providing TCP_NODELAY. Another pressure is the need to avoid re-certification. We have strong resistance to upgrading the version of GNAT we use in case it affects application behaviour. And remember many of the projects that might switch will be in long-term maintenance; if there's a complete set of unit tests it would be less of a risk, but that can be a big IF. --S