Date: Sun, 1 Sep 2002 11:30:43 -0700 From: "David O'Brien" <obrien@FreeBSD.ORG> To: leimy2k@mac.com Cc: Terry Lambert <tlambert2@mindspring.com>, freebsd-current@FreeBSD.ORG, Alexander Langer <alex@big.endian.de>, Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at> Subject: Re: gcc 3.1 / streambuf.h broken with "using namespace std;" Message-ID: <20020901183043.GF94999@dragon.nuxi.com> In-Reply-To: <1FFDCCFF-BDA8-11D6-9DF6-0003937E39E0@mac.com> References: <3D714B7F.CE386B65@mindspring.com> <1FFDCCFF-BDA8-11D6-9DF6-0003937E39E0@mac.com>
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On Sun, Sep 01, 2002 at 07:41:24AM -0500, leimy2k@mac.com wrote: > >I thought it was the general consensus that the 3.1 version of > >the compiler was broken, and generated bad code, and that the 3.2 > >compiler had a lot of these problems corrected, but destroyed > >binary compatability with 3.1. > > Yes but if you go through and read gcc.gnu.org you will see that 3.2 > can be configured on linux to use the "multi-vendor ABI standard". The "multi-vendor ABI standard" (agreed upon by all that care about IA-64), was supposed to be properly implemented in 3.1.x. Due to a bug in the implementation 3.1.x wasn't compliant to the new "multi-vendor ABI standard". THAT IS THE ONLY REASON 3.2 CAME INTO EXISTENCE. FreeBSD, SuSE, RedHat, Mandrake all have new OS releases coming out this Fall and did not want to go thru an ABI change between 3.1.1 and what was then 3.2 (and is now 3.3). I led the push, strongly supported by some SuSE folks to create a 3.2 which was exactly 3.1.1 + "multi-vendor ABI standard" compliance fixes. Along the way to 3.2.0 a few other bugs got fixed that would have been in 3.1.2 had the 3.2 we have today not been created. The "multi-vendor ABI standard" fixes could not go into 3.1.1 or 3.1.2 because the GCC developers have a rule that ABI changes cannot happen in mid-branch. We have the same with our RELENG_X branches. It is *that* simple. Rather than bitch that 3.1.1 "sucks"; we should thanking the GCC Steering Committee that after much thought they were willing to take the vendors' needs into account. I am not sure FreeBSD would have done the same. > Actually they have been trying to make this work all along and is > probably why they break ABI compatibility. 3.1 has issues with > template classes that use functions containing static variables [at > least a pre-release of it did on Darwin/OS X]. Apple highly modifies the GCC sources. So any bugs/problems/issues you find in their compiler you cannot blame on the GCC developers w/o researching the bug/problem/issue. > 3.2 necessary for some people [though I hope every time the fix > something that their test-cases increases by one.... that would be > smart anyway]. The test suite does. We should be so lucky to have such a test suite. > 3.2 is the "more confident" ABI and while there are no guarantees that > 3.3 will work with 3.2... there seems to be better feelings about it. Correct. Not only "better feelings" but "fully intended". But as we saw with 3.1.0, bugs happen. > >It was my understanding that FreeBSD 5.0 release was not going > >to be GCC 3.3 (because GCC 3.3 would not be released in time for > >FreeBSD to not be "pulling a RedHat" if they shipped a beta and > >called it 3.3) , might be GCC 3.2, and was currently down-rev > >from there. 3.3.0 will be released before FreeBSD 5.1. It is my advice to FreeBSD'ville that we go with a GCC 3.3 snapshot for FBSD 5.0 and a GCC 3.3.0 release for FBSD 5.1. That way we can get the new features of 3.3 into our 5.x branch. AND get bug fixes by importing 3.3.1 and 3.3.2 into later FBSD 5.x releases. > RedHat actually created a release that never occurred [2.96] in the gcc > release chain... and if you use it, its actually a pretty nice > compiler.... I know the ABI doesn't work with anything but 2.96 though. The ABI was in flux during those times -- the "2.96" ABI is compatabile with nothing else. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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