Date: Tue, 26 Mar 2013 13:33:24 +0200 From: "Andrew W. Nosenko" <andrew.w.nosenko@gmail.com> To: mexas@bristol.ac.uk Cc: gerald@pfeifer.com, freebsd-ports@freebsd.org, bdrewery@freebsd.org Subject: Re: is it a good idea to overwrite GCC_DEFAULT_VERSION= in Mk/bsd.gcc.mk? Message-ID: <CALa-7vx_gHLiMJpZ3P_VgFHDpRof1Azzma3Afa0f8NtNarUi-Q@mail.gmail.com> In-Reply-To: <201303261050.r2QAo9v6041217@mech-cluster241.men.bris.ac.uk> References: <CALa-7vw=e2GkfvReD4-eurUv%2BNaR6nJAT9cZ45tQVT6uac-n7Q@mail.gmail.com> <201303261050.r2QAo9v6041217@mech-cluster241.men.bris.ac.uk>
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On Tue, Mar 26, 2013 at 12:50 PM, Anton Shterenlikht
<mexas@bristol.ac.uk> wrote:
> From andrew.w.nosenko@gmail.com Mon Mar 25 18:09:38 2013
>
> On Mon, Mar 25, 2013 at 5:59 PM, Gerald Pfeifer <gerald@pfeifer.com> wrote:
> > On Mon, 25 Mar 2013, Anton Shterenlikht wrote:
> >> I've now run ia64 with the above change for over 2 weeks,
> >> mostly rebuilding ports, etc.
> >> I didn't see any issues with gcc47.
> >> So, from my very limited testing,
> >> gcc47 can be made default.
> >
> > Thanks for the feedback, Anton! To really make that switch
> > globally, we'll need more extensive testing, a full ports builds
> > run, since there is a chance that some port you are not using may
> > be broken, and I hope to get this done in the coming weeks.
>
> >From my expiriense, devel/glib20 cannot be compiled with gcc47.
>
> Isn't it built with the system default compiler:
>
> configure:3954: checking for C compiler version
> configure:3963: cc --version >&5
> cc (GCC) 4.2.1 20070831 patched [FreeBSD]
>
> I think we are only talking about updating lang/gcc to 4.7.
By default -- yes, it is going to build with base gcc. But topic and,
therefore, my reaction was about overriding compiler to be lang/gcc*
from ports and whether there are ports, which fail in that case. At
least, as I understand it.
Now, why overriding the compiler for Glib seems important to me and
why I tried to do that:
Since
commit aba0f0c38bbfa11ad48b5410ebdbed2a99e68c58
Author: Ryan Lortie <desrt@desrt.ca>
Date: Tue Oct 18 16:21:50 2011 -0400
gatomic: introduce G_ATOMIC_LOCK_FREE
glib atomics implementation depends on gcc predefined macro
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4, which is absent on the base
gcc-4.2 and on Clang (all version, at least at that time).
As consequence, we have a mutex-based implementation of atomics.
Building Glib using more modern GCC (e.g. gcc-4.7) would help, but
gnome-libtool hack prevents us from that.
See also:
Thread "atomic ops broken on mac/xcode"
https://mail.gnome.org/archives/gtk-devel-list/2012-August/msg00089.html
Gnome bugzilla #682818: atomic ops broken on mac/xcode
https://bugzilla.gnome.org/show_bug.cgi?id=682818
LLVM/Clang bugzilla #11174: #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_
http://llvm.org/bugs/show_bug.cgi?id=11174
--
Andrew W. Nosenko <andrew.w.nosenko@gmail.com>
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