Date: Thu, 7 Apr 2011 07:31:14 +0000 From: Alexander Best <arundel@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: Juli Mallett <jmallett@FreeBSD.org>, svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, Ulrich Spoerlein <uqs@FreeBSD.org> Subject: Re: svn commit: r220401 - in head: . share/mk tools/build/mk tools/build/options Message-ID: <20110407073114.GA15050@freebsd.org> In-Reply-To: <D05CD16D-494B-4902-9D1E-F2AA349CE0F3@bsdimp.com> References: <201104062008.p36K8NR0015687@svn.freebsd.org> <20110406210416.GA62173@freebsd.org> <BANLkTik=kCL79VrcWsChoRexjxgdfCAB2Q@mail.gmail.com> <20110406214133.GA66860@freebsd.org> <D05CD16D-494B-4902-9D1E-F2AA349CE0F3@bsdimp.com>
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On Wed Apr 6 11, Warner Losh wrote: > > On Apr 6, 2011, at 3:41 PM, Alexander Best wrote: > > > On Wed Apr 6 11, Juli Mallett wrote: > >> On Wed, Apr 6, 2011 at 14:04, Alexander Best <arundel@freebsd.org> wrote: > >>> On Wed Apr 6 11, Ulrich Spoerlein wrote: > >>>> Author: uqs > >>>> Date: Wed Apr 6 20:08:23 2011 > >>>> New Revision: 220401 > >>>> URL: http://svn.freebsd.org/changeset/base/220401 > >>>> > >>>> Log: > >>>> Complete WITHOUT_CXX support. It implies WITHOUT_GROFF and > >>>> WITHOUT_CLANG. > >>> > >>> is there no way to build clang/llvm without CXX support? > >> > >> Clang and LLVM are written in C++. Even if their support for > >> compiling C++ could be disabled, you'd still need a C++ cross-compiler > >> to build them, which ought to be disabled by WITHOUT_CXX, right? > > > > good point. is it even possible to build a world *with* C++ support, if the > > installed world *doesn't* have C++ support? is the C++ part of gcc written in > > C? if that's the case it's possible. > > Yes. We don't need c++ to bootstrap g++ or anything else in the base system. Once we build the compilers, we can build the c++ that's in the tree. however that means that FreeBSD can never get rid of gcc. so clang can never become the main and only base compiler. > > > couldn't we install clang *without* C++ support and then do the following to > > build it *with* C++ support: > > > > 1) use gcc to build a bootstrap gcc *with* C++ support > > 2) use the bootstrap gcc to build clang > > I suppose you could do that, but I'm unsure how much that buys you... > > Warner -- a13x
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