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Re: Relative expressions and ASSERT
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: "Maciej W. Rozycki" <macro at codesourcery dot com>, Daniel Jacobowitz <dan at codesourcery dot com>, binutils at sourceware dot org, Kazu Hirata <kazu at codesourcery dot com>
- Date: Wed, 19 Jan 2011 04:27:53 -0800
- Subject: Re: Relative expressions and ASSERT
- References: <20101216110243.GD15607@bubble.grove.modra.org> <20101216154855.GT7961@caradoc.them.org> <AANLkTin_6FXTQwGjbbgk9CSc_ceahsYQyS5zVcX11ySJ@mail.gmail.com> <20101216225820.GE15607@bubble.grove.modra.org> <AANLkTikYeeUOs41zH2K7Ef8VzXwXan11OLhn+m7iBk=G@mail.gmail.com> <20101217000136.GF15607@bubble.grove.modra.org> <AANLkTi=5BPNSOw+SFR0baqYq-peS47whyc0P9dhyprMh@mail.gmail.com> <AANLkTi=XGnHQ7Gn_oi+1PwBn34gvFEgr_W11b3Cg=hWh@mail.gmail.com> <20101220125909.GL15607@bubble.grove.modra.org> <alpine.DEB.1.10.1101190615310.5891@tp.orcam.me.uk> <20110119082505.GA11694@bubble.grove.modra.org>
On Wed, Jan 19, 2011 at 12:25 AM, Alan Modra <amodra@gmail.com> wrote:
> On Wed, Jan 19, 2011 at 06:48:51AM +0000, Maciej W. Rozycki wrote:
>> ?Is that intended behaviour? ?From your update to the manual I infer
>> otherwise and it looks to me like a mishandled case that slipped through,
>> but perhaps I'm missing something. ?Either way I find it plain wrong that
>> a difference of two symbols (both coming from/relative to the same
>> section) yields a plain number in GAS, but not in an LD script. ?Hmm...
>
> ld actually does follow the current ld.texinfo description. ?The two
> symbols are in the same section, so the operation (subtraction in this
> case) is performed on their offsets, yielding a result in the same
> section.
>
> Admittedly, this does lead to an odd result. ?Should we special case
> subtraction? ?Exclusive or too?
>
I got a linker regression report on symbol subtraction on x86. I am waiting
for a testcase.
--
H.J.