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=-0.3 required=5.0 tests=BAYES_00, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,85034d1ac78a66eb X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-02-23 09:58:07 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!netnews.com!xfer02.netnews.com!newsfeed2.earthlink.net!newsfeed.earthlink.net!newsfeed0.news.atl.earthlink.net!news.atl.earthlink.net!news.mindspring.net!not-for-mail From: Richard Riehle Newsgroups: comp.lang.ada Subject: Re: Ada Operating System Date: Sat, 23 Feb 2002 10:04:11 -0800 Organization: AdaWorks Software Engineering Message-ID: <3C77D99B.7A5F7176@adaworks.com> References: <5Tzc8.111999$H37.15018616@news2-win.server.ntlworld.com> <3C73F480.5010806@mail.com> <9ff447f2.0202220108.7f14c9bc@posting.google.com> <9ff447f2.0202222044.78c44b25@posting.google.com> Reply-To: richard@adaworks.com NNTP-Posting-Host: 9e.fc.cc.9d Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Server-Date: 23 Feb 2002 18:01:35 GMT X-Mailer: Mozilla 4.7 [en] (Win98; I) X-Accept-Language: en Xref: archiver1.google.com comp.lang.ada:20309 Date: 2002-02-23T18:01:35+00:00 List-Id: Adrian Hoe wrote: > Sometime ago, I was thrown a question while giving talks in > Universities. "What language do they use to build the Ada compiler?" > and an (assumed) answer from the audience was "C". Then raised another > question: "If Ada has many safety features that C does not have and > the Ada compiler was written in C, how exactly safe is Ada?" This is actually quite a good question. In discussing another programming language that uses a C-Path compiler this question came up with regard to certain features of C that are inherently unsafe. It seems that, for the compiler under discussion, things such as integer overflow, etc. were not directly addressed. (Yes, I know GNAT is not a C-Path compiler). Several Ada compilers, other than GNAT, are C-Path technology. For those compilers to pass the conformity tests, they must account for the the issues inherent in C. I recall a conversation with Tucker where he described the amount of effort that went into making certain his company's C-Path compiler covered all the reliability issues before sending it off for validation. Richard Riehle