Date: Sat, 7 Jun 2014 12:33:29 -0400 From: Adrian Chadd <adrian@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Ian Lepore <ian@freebsd.org>, Olavi Kumpulainen <olavi.m.kumpulainen@gmail.com> Subject: Re: C++ exceptions in freebsd-arm doesn't seem to work Message-ID: <CAJ-Vmom%2BaGqwO1r7vxVzS=3oyYe-HphPU2jqUpmnYcAOkgMX7A@mail.gmail.com> In-Reply-To: <0567DA73-DE37-48F0-BD18-F6498D6083A6@bsdimp.com> References: <BEAC4CFB-EC4F-456D-8173-2E34CCE3A2C1@gmail.com> <1402156516.20883.154.camel@revolution.hippie.lan> <CAJ-VmomsNogAzk8j6ob8aA%2BmJeiO5TEF=FQnq=mNzsVPyt23xw@mail.gmail.com> <EEBA06F7-0CF1-4712-BA61-5951323B541B@bsdimp.com> <CAJ-Vmo=7VSZQH8NGBvYN015cV7WGcA=S2ELdpnmk798y98ydSQ@mail.gmail.com> <0567DA73-DE37-48F0-BD18-F6498D6083A6@bsdimp.com>
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On 7 June 2014 12:29, Warner Losh <imp@bsdimp.com> wrote: > > On Jun 7, 2014, at 10:24 AM, Adrian Chadd <adrian@freebsd.org> wrote: > >> On 7 June 2014 12:14, Warner Losh <imp@bsdimp.com> wrote: >>> >>> On Jun 7, 2014, at 10:07 AM, Adrian Chadd <adrian@FreeBSD.org> wrote: >>> >>>>> Sadly, all I can do is confirm what you say: C++ exceptions don't work >>>>> on ARM EABI, not with clang and not with gcc. The only combo that works >>>>> is gcc and OABI, but with that combo you lose hardware floating point. >>>>> >>>>> There are rumours that this may be fixed in clang 3.5, but we apparently >>>>> can't import 3.5 because it can't be bootstrapped using gcc 4.2. I >>>>> haven't had time yet to learn how to build clang 3.5 out-of-tree to >>>>> confirm that exceptions work there. >>>>> >>>> >>>> If only we had a way to tell our build system to build the in-src-tree >>>> compiler suite using an external compiler toolchain. That'd make those >>>> problems go away. >>> >>> We do. It isn’t perfect, and you’d have to bootstrap either a new gcc or a 3.4 clang first to do it though. The automation of the bootstrapping isn’t present, and is what I’m working on… >> >> Cool! The last time I wrangled this, I could only get it to build the >> whole system with the compiler I fed in. It wouldn't build the >> in-source-tree compiler with the external compiler I gave it - using >> the external compiler seemed to totally just negate building the >> toolchain. I'm glad this isn't the case. > > It does take many hand-stands to doit... I may give it another go then. >> I'd personally like to rehash the "build from under Linux" discussion. >> I keep bumping into cases like this where a lot of the work being done >> to make this stuff happen is in line with what we need to be able to >> build FreeBSD under a non-FreeBSD operating system. I'd really like >> _that_ to happen - it'll help migrations _to_ freebsd from other >> projects. > > No. Have that as a separate discussion. That’s a big bike shed of wonder and requires functionality not present in the tree (e.g. actual work). My discussion is “we currently allow X to work, I want to change that to X+Y so we can import Z.” which is much smaller. So go ahead and have your linux discussion, but don’t hijack mine. Absolutely. -ahome | help
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