From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 119144 invoked by alias); 7 Oct 2016 08:31:21 -0000 Mailing-List: contact java-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: java-patches-owner@gcc.gnu.org Received: (qmail 119120 invoked by uid 89); 7 Oct 2016 08:31:20 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy=klose, Klose, dokoubuntucom, D*ubuntu.com X-Spam-User: qpsmtpd, 2 recipients X-HELO: relay1.mentorg.com Received: from relay1.mentorg.com (HELO relay1.mentorg.com) (192.94.38.131) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 07 Oct 2016 08:31:09 +0000 Received: from nat-ies.mentorg.com ([192.94.31.2] helo=SVR-IES-MBX-04.mgc.mentorg.com) by relay1.mentorg.com with esmtp id 1bsQYb-00001r-7G from Iain_Sandoe@mentor.com ; Fri, 07 Oct 2016 01:31:05 -0700 Received: from [127.0.0.1] (137.202.0.87) by SVR-IES-MBX-04.mgc.mentorg.com (139.181.222.4) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Fri, 7 Oct 2016 09:30:59 +0100 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Subject: Re: [PATCH] Delete GCJ From: Iain Sandoe In-Reply-To: <10704c8f-fd72-8d13-17a1-f522e88345b2@ubuntu.com> Date: Fri, 07 Oct 2016 08:31:00 -0000 CC: Mike Stump , Rainer Orth , Jeff Law , Andrew Haley , GCC Patches , GCJ-patches Content-Transfer-Encoding: quoted-printable Message-ID: References: <78f841e7-808b-58d0-7913-3ec0d19630a0@redhat.com> <4deb7e45-e428-d819-aabc-748abe8f7686@redhat.com> <0E421C5A-7EF5-4182-A13B-BF9AEAF90215@comcast.net> <6DA7C7D0-314E-4A5E-8B35-5A8EA2F74CD8@mentor.com> <2b5de569-1efd-f407-49c2-c9fa84cc5315@ubuntu.com> <4964955d-4de1-618c-de41-835ca19f9932@ubuntu.com> <4FBA6B16-460A-4EBB-8809-0883A84ABEB7@mentor.com> <0bf14402-d4e6-5fb0-8a63-479903ed2141@ubuntu.com> <01B885DF-4340-43C6-A784-21326A9CA8CF@comcast.net> <10704c8f-fd72-8d13-17a1-f522e88345b2@ubuntu.com> To: Matthias Klose X-ClientProxiedBy: svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) To SVR-IES-MBX-04.mgc.mentorg.com (139.181.222.4) X-SW-Source: 2016-q4/txt/msg00015.txt.bz2 > On 7 Oct 2016, at 00:58, Matthias Klose wrote: >=20 > On 06.10.2016 20:00, Mike Stump wrote: >> On Oct 6, 2016, at 9:56 AM, Rainer Orth wr= ote: >>> I wouldn't hard-fail, but completely disable objc-gc with an appropriate >>> warning. The Objective-C maintainers may have other preferences, thoug= h. >=20 > I think I can't do that in the top level make file very well (currently I= only > have the pkg-config check there for an early failure, but that check does= n't > tell me if the library is present for all multilib variants). And I can't= check > for multilibs because I don't know if the bootstrap compiler is multilib = aware. hrm, so perhaps we need a =E2=80=94with-target-boehm-gc=3D type arrangement= , and it=E2=80=99s the configurer=E2=80=99s responsibility to provide a pat= h with appropriate headers/libs for the multi-lib configuration being attem= pted. >=20 >> gcc historically is fairly weak at complex configurations. I need the 3= 2 bit libraries to support -m32, but, those libraries might not be present,= but do I build all the rest of my libraries, and if i do, do I test them o= nce build, but what is other dependent external libraries are missing. Do = I turn off the multilib, or do I not? >>=20 >> I used to manage some of this by passing in configure flags to control m= ultilibbing based upon what libraries were install and then run testing bas= ed upon that. Of course, that's all external to gcc proper. Doesn't really= make gcc any easier to configure and build or advance gcc. >>=20 >> We could smell the system at configure time, and turn on and off multili= b variants and things like objc gc. Target specific, but I think it helps t= o ponder this in a target independent way. This can then turn on and off o= bjc gc support directly. To get it on, one would need to install the neede= d libraries, and reconfigure and rebuild gcc. I think I might like that th= e best. Has a nice easy of use about it, and then everything gcc does is r= ather sane (no funny build errors when a needed library isn't present). >>=20 >>=20 >> So, I think, if I understand what you propose, I'm fine with that. >=20 > So your proposal is to replace the ": dnl ..." line in libobjc/configure.= ac with > a hard error message and leave it to the user to correctly configure GCC?= That > would rely on the compiler to find the library in a system wide multilib = aware > directory (e.g. /usr/lib/i386-linux-gnu, or /usr/lib32). Is this the cas= e for > Solaris and Darwin? for Darwin, it=E2=80=99s not a default install (but then neither are the ho= st deps such as gmp & friends) - so the toolchain builder on Darwin already= needs to make some provisions outside the system. It=E2=80=99s just that = the only target provisions to date have been the sysroot (we haven=E2=80=99= t yet made use of add-on target libs). > I'm fine with that, it wouldn't affect configurations like x86_64-linux-g= nu > where multilib is the default (but objc-gc is not). >=20 > Looking back at libjava, I think everybody disabled multilibs for libjava, > because nobody had a complete gtk2 stack for multilibs, however that was a > complete subdir, not just a certain configuration in that subdir. Looking= back > at libffi and separate released libffi's I first built multilib'ed libffi > libraries from the libffi source for Debian/Ubuntu, then dropped these be= cause > they were not used, and until today GCC internal and external libffi are > hopelessly out of sync, so you couldn't use an external libffi to build l= ibjava. Becase Darwin=E2=80=99s libjava does not depend on the gtk2 stack, actually= normally libjava (and libffi, gc) were generally built and tested (by thos= e who cared to do it) as multilibs [the default]. >=20 > In the past I looked at updating boehm-gc to recent sources but never fin= ished > because libjava relied on internals. Afaics this is not the case for obj= c-gc, > so maybe you could update boehm-gc. But I don't want to go this road myse= lf =E2=80=A6 .. and I don=E2=80=99t have cycles to volunteer to try this at present eith= er. Iain >=20 > Matthias