Date: Wed, 5 Jan 2011 21:03:37 +0000 From: Alexander Best <arundel@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, Doug Barton <dougb@freebsd.org>, Dimitry Andric <dim@freebsd.org>, src-committers@freebsd.org Subject: Re: svn commit: r216977 - in head/libexec/rtld-elf: amd64 i386 Message-ID: <20110105210337.GA60416@freebsd.org> In-Reply-To: <201101051555.45419.jhb@freebsd.org> References: <201101042051.p04KpSGk054564@svn.freebsd.org> <201101051508.40337.jhb@freebsd.org> <20110105203816.GA54929@freebsd.org> <201101051555.45419.jhb@freebsd.org>
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On Wed Jan 5 11, John Baldwin wrote: > On Wednesday, January 05, 2011 3:38:16 pm Alexander Best wrote: > > On Wed Jan 5 11, John Baldwin wrote: > > > On Wednesday, January 05, 2011 2:59:20 pm Doug Barton wrote: > > > > On 01/05/2011 10:59, Alexander Best wrote: > > > > > > > > > judging from the discussion going on right now it seems those flags will be > > > > > grouped together to form a new variable. so things will probably change shortly > > > > > and fixing the order is probably not necessary. > > > > > > > > Much better to fix the problem properly now than to rely on future work > > > > that may or may not happen. I realize that you alluded to this later in > > > > your message, but I think as a general principle this is worth reinforcing. > > > > > > > > > some people have proposed hacking into clang which i personally think is a very > > > > > bad idea. why not contact the clang developers? they might like the idea of a > > > > > switch disabling all advanced extensions for every architecture? > > > > > > > > I agree with this. We have a very awkward situation right now with lots > > > > of local hacks in our version of gcc that in an ideal world we would not > > > > replicate with clang; particularly considering the much lower barrier to > > > > entry when it comes to contributing things back. > > > > > > My suggestion was that we ask clang to add a '-mno-whatever' and hopefully we > > > could convince gcc to follow suit. clang developers seem to be fairly > > > receptive, so I was hoping one of our clang liaisons could suggest it. :) > > > > why gcc? even if they decide to add such a switch it will be gpl3'ed. shouldn't > > gcc with clang at hand be considered legacy software? > > I think a more realistic view is that some folks will want to use a gpl3 > toolchain (e.g. platforms clang doesn't support (or support well) which > need newer binutils, etc.). The gpl3 bits don't have to live in the tree, > but I think our build infrastructure should support using them as an > external toolchain. good point. would be nice to be able to do echo "CC = gcc46" >> /etc/src.conf ... expecially for benchmarking clang vs. a recent gcc for world/kernel. cheers. alex > > -- > John Baldwin -- a13x
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