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Re: REL vs. RELA: how to choose?

To: Geoff Keating <geoffk at redhat dot com>
Subject: Re: REL vs. RELA: how to choose?
From: Ian Lance Taylor <ian at zembu dot com>
Date: 15 Feb 2001 11:09:11 -0800
Cc: dje at transmeta dot com, nickc at redhat dot com, greg at mcgary dot org, binutils at sources dot redhat dot com
References: <200102150025.QAA00635@elmo.cygnus.com><14987.24180.292835.72344@casey.transmeta.com><200102150823.AAA02226@geoffk.org>

Geoff Keating <geoffk@geoffk.org> writes:

> > From: Doug Evans <dje@transmeta.com>
> > Date: Wed, 14 Feb 2001 20:43:32 -0800 (PST)
> 
> > Note that the mips and m32r ports are REL
> > but they do get the 16 hi + 16 lo case correct.
> 
> They do it by constraining the code sequences that compilers can
> generate, leading to poorer optimisation.  (The actual requirement is
> that a LO reloc to the same address must immediately follow a HI
> reloc, I believe.)

They used to constrain the code sequence, but I believe that they no
longer do, at least when using gas.  The assembler now sorts the
relocs to preserve the properties required in the object file.  See
mips_frob_file in gas/config/tc-mips.c.

Ian

References:
- Re: REL vs. RELA: how to choose?
  - From: Nick Clifton
- Re: REL vs. RELA: how to choose?
  - From: Doug Evans
- Re: REL vs. RELA: how to choose?
  - From: Geoff Keating

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