From owner-freebsd-arm@FreeBSD.ORG  Fri May 17 12:49:26 2013
Return-Path: <owner-freebsd-arm@FreeBSD.ORG>
Delivered-To: freebsd-arm@freebsd.org
Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115])
 by hub.freebsd.org (Postfix) with ESMTP id 27E96A08;
 Fri, 17 May 2013 12:49:26 +0000 (UTC)
 (envelope-from andrew@fubar.geek.nz)
Received: from nibbler.fubar.geek.nz (nibbler.fubar.geek.nz [199.48.134.198])
 by mx1.freebsd.org (Postfix) with ESMTP id 0CC0EA74;
 Fri, 17 May 2013 12:49:25 +0000 (UTC)
Received: from bender (176-35-57-122.xdsl.murphx.net [176.35.57.122])
 by nibbler.fubar.geek.nz (Postfix) with ESMTPSA id 1A1495E1F1;
 Fri, 17 May 2013 12:39:50 +0000 (UTC)
Date: Fri, 17 May 2013 13:39:27 +0100
From: Andrew Turner <andrew@fubar.geek.nz>
To: Tim Kientzle <kientzle@freebsd.org>
Subject: Re: clear_cache and clang (was Re: Git crash on EABI system.)
Message-ID: <20130517133927.62575abe@bender>
In-Reply-To: <6FEBBFCD-C698-48E6-B9CA-D9FCB6A5AD5A@freebsd.org>
References: <A44A52E5-E878-45CD-B032-F111E5E244BA@freebsd.org>
 <51949698.80205@thieprojects.ch>
 <2290084B-D302-4489-BB01-817497901E2B@freebsd.org>
 <5195F2CA.2090103@thieprojects.ch>
 <6FEBBFCD-C698-48E6-B9CA-D9FCB6A5AD5A@freebsd.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: freebsd-arm <freebsd-arm@freebsd.org>
X-BeenThere: freebsd-arm@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Porting FreeBSD to the StrongARM Processor <freebsd-arm.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm>
List-Post: <mailto:freebsd-arm@freebsd.org>
List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 17 May 2013 12:49:26 -0000

On Fri, 17 May 2013 08:22:14 -0400
Tim Kientzle <kientzle@freebsd.org> wrote:

> 
> On May 17, 2013, at 5:05 AM, Werner Thie wrote:
> 
> > Tim
> > 
> > Maybe you or somebody else can shed some light onto how compiler-rt
> > is used for the ARM platform, specifically why am I getting a
> > 
> > missing symbol __clear_cache
> 
> I suspect it's somehow related to this (from libcompiler_rt/Makefile):
> 
> # Don't build clear_cache on ARM with clang as it is a builtin there.
> .if ${MACHINE_CPUARCH} != "arm" || ${COMPILER_TYPE} != "clang"
> SRCF+=  clear_cache
> .endif
> 
> Do you know what code in ctypes for Python is referring to
> that symbol?   There may be some oddity in how that symbol is
> being referenced that's incompatible with the clang built-in.

__clear_cache is a builtin function in clang and it will complain if
we have a function with it's name because of this.

There may be issues when linking with objects built with gcc, however I
don't know the state of gcc from the ports tree. The only known working
version of gcc for FreeBSD ARM EABI is in base.

Andrew