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From: Cary Coutant <ccoutant@gmail.com>
To: Alan Modra <amodra@gmail.com>
Cc: "H.J. Lu" <hjl.tools@gmail.com>, Michael Matz <matz@suse.de>,
	Rich Felker <dalias@libc.org>,
		"Carlos O'Donell" <carlos@redhat.com>,
	Florian Weimer <fweimer@redhat.com>,
	nsz@port70.net, 	Jan Beulich <JBeulich@suse.com>,
	Binutils <binutils@sourceware.org>,
	gnu-gabi@sourceware.org
Subject: Re: RFC: Add GNU_PROPERTY_NEED_PHDRS
Date: Mon, 01 Jan 2018 00:00:00 -0000	[thread overview]
Message-ID: <CAJimCsETK4udsPG9LYL2Qn5X5nN7NjCbiyuGirUGvgA4MM_qHg@mail.gmail.com> (raw)
In-Reply-To: <20181004021457.GE3179@bubble.grove.modra.org>

> If you specify PHDRS in a script, ld uses exactly those program
> headers, and I believe it should continue to operate that way.  So to
> add PT_GNU_EH_FRAME, say, when an executable has .eh_frame_hdr, you'd
> need a script with PT_GNU_EH_FRAME specified in PHDRS.  And another
> without PT_GNU_EH_FRAME when the executable doesn't have
> .eh_frame_hdr.  That soon becomes impractial considering the number of
> optional headers, requiring auto-generation of the PHDRS script
> snippet.

Oh, I see. Yeah, that does make it impractical.

Still, I'd like to understand why HJ claims it's intrusive to have ld
create a PT_LOAD segment for the headers. I haven't tried it yet in
gold (don't support -z separate-code), but it doesn't seem like it
would be at all difficult or intrusive.

-cary

  reply	other threads:[~2018-10-04 15:10 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-01  0:00 H.J. Lu
2018-01-01  0:00 ` Michael Matz
2018-01-01  0:00   ` H.J. Lu
2018-01-01  0:00     ` Michael Matz
2018-01-01  0:00       ` H.J. Lu
2018-01-01  0:00         ` Michael Matz
2018-01-01  0:00           ` H.J. Lu
2018-01-01  0:00             ` Michael Matz
2018-01-01  0:00               ` H.J. Lu
2018-01-01  0:00                 ` Cary Coutant
2018-01-01  0:00                   ` Alan Modra
2018-01-01  0:00                     ` Cary Coutant
2018-01-01  0:00                       ` Alan Modra
2018-01-01  0:00                         ` Cary Coutant [this message]
2018-01-01  0:00                           ` H.J. Lu
2018-01-01  0:00                             ` Rich Felker
2018-01-01  0:00                               ` H.J. Lu
2018-01-01  0:00                                 ` Alan Modra

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