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To: Daniel Jacobowitz <drow@false.org>
Cc: Kevin Buettner <kevinb@redhat.com>, gdb-patches@sources.redhat.com
Subject: Re: RFA: correct size of long double on PPC Linux
References: <vt2u10ew1ye.fsf@zenia.home> <20040325222358.1e0ccbe8@saguaro>
	<20040326151957.GA15739@nevyn.them.org>
From: Jim Blandy <jimb@redhat.com>
Date: Fri, 26 Mar 2004 15:45:00 -0000
In-Reply-To: <20040326151957.GA15739@nevyn.them.org>
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Daniel Jacobowitz <drow@false.org> writes:

> On Thu, Mar 25, 2004 at 10:23:58PM -0700, Kevin Buettner wrote:
> > On 24 Mar 2004 13:10:33 -0500
> > Jim Blandy <jimb@redhat.com> wrote:
> > 
> > > 2004-03-24  Jim Blandy  <jimb@redhat.com>
> > > 
> > > 	* ppc-linux-tdep.c (ppc_linux_init_abi): Long doubles are eight
> > > 	bytes long on PPC Linux.
> > 
> > Can you provide the ABI reference for this?
> > 
> > According to the documentation that I have (which is the System V ABI
> > PowerPC Processor Supplement), the size of a long double is 16 bytes.
> 
> Yes - this is one of the known warts in the PPC GNU/Linux ABI.  People
> have been talking for years about fixing it to match the SysV ABI.  GCC
> only recently got 128-bit long double support on PPC, so it may be
> changing soon; but for all existing PPC GNU/Linux systems I know of,
> eight bytes is correct.

I went to the Linux Standards Base, and it said that programs that use
'long double' on PPC Linux are non-conformant.  So I figured the best
I could do was to make GDB match GCC.