Date: Wed, 6 Apr 2011 20:15:03 -0600 From: Warner Losh <imp@bsdimp.com> To: Alexander Best <arundel@FreeBSD.org> 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: <D05CD16D-494B-4902-9D1E-F2AA349CE0F3@bsdimp.com> In-Reply-To: <20110406214133.GA66860@freebsd.org> References: <201104062008.p36K8NR0015687@svn.freebsd.org> <20110406210416.GA62173@freebsd.org> <BANLkTik=kCL79VrcWsChoRexjxgdfCAB2Q@mail.gmail.com> <20110406214133.GA66860@freebsd.org>
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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 >>>>=20 >>>> Log: >>>> Complete WITHOUT_CXX support. It implies WITHOUT_GROFF and >>>> WITHOUT_CLANG. >>>=20 >>> is there no way to build clang/llvm without CXX support? >>=20 >> 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? >=20 > 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. > couldn't we install clang *without* C++ support and then do the = following to > build it *with* C++ support: >=20 > 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=
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