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Subject: Re: EPICS build system DESTDIR support
From: Matt Newville <newville@cars.uchicago.edu>
To: Michael Davidsaver <mdavidsaver@gmail.com>
Cc: EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Thu, 6 Jul 2017 11:27:19 -0500


On Thu, Jul 6, 2017 at 3:31 AM, Michael Davidsaver <mdavidsaver@gmail.com> wrote:
On 07/05/2017 06:45 PM, Andrew Johnson wrote:
> There are tools which can edit the RPATH setting in an ELF binary, but
> IIRC they can only shorten the path, never make it longer.

There is at least one utility 'patchelf' which does not have this
limitation.

> That's an
> indication to me that what they are doing probably isn't completely
> kosher,

ELF is a fairly complicated format with lots of cross linking between
sections.  My guess is that other/older tools don't go to the trouble of
making all the necessary changes to re-layout the section holding the
rpath string.

> and I would rather not rely on arbitrary limits such as the
> length of the RPATH that we first compile in. Until the standard GNU
> binutils programs (objcopy and/or elfedit) provide a way to change an
> RPATH I would be reluctant to use this approach in Base itself.

I won't argue with this reluctance.  I also don't like the idea of
supporting something like patchelf.  One reason being that this doesn't
help with OSX and Mach binaries.

FWIW, Mac OSX has a utility called install_name_tool that can modify RPATH.

I haven't seen that patchelf is limited to making RPATH shorter.  But I completely understand the reluctance to rely on a 3rd party utility like patchelf.

--Matt Newville


References:
Re: EPICS build system DESTDIR support J. Lewis Muir
Re: EPICS build system DESTDIR support Andrew Johnson
Re: EPICS build system DESTDIR support Michael Davidsaver

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