From: "H.J. Lu" <hjl.tools@gmail.com>
To: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Wilco Dijkstra via Libc-alpha <libc-alpha@sourceware.org>,
Richard Henderson <richard.henderson@linaro.org>
Subject: Re: [RESEND PATCH] Makeconfig: Set pie-ccflag to -fPIE by default
Date: Mon, 29 Aug 2022 12:43:34 -0700 [thread overview]
Message-ID: <CAMe9rOrwTuucuMEKrTizYSJ92B5JBf7n7rTNhgOWcLPUhKvCYA@mail.gmail.com> (raw)
In-Reply-To: <AS4PR08MB7901F6D180527AC29A0A57DB83769@AS4PR08MB7901.eurprd08.prod.outlook.com>
On Mon, Aug 29, 2022 at 8:27 AM Wilco Dijkstra <Wilco.Dijkstra@arm.com> wrote:
>
> Hi Florian,
>
> * Wilco Dijkstra via Libc-alpha:
> >> However this leads to the question is why aren't all symbols marked as
> >> hidden in the static PIE build? Ie. are there any symbols that must be
> >> shared with a DSO loaded by a dl_open?
> >
> > The static main executable does not have a dynamic symbol table, so such
> > sharing cannot happen (except through function pointers being passed
> > around, but symbol visibility of course does not matter there).
>
> Right, so it should be safe then to mark all symbols as hidden.
>
> We could also teach GCC to never emit GOT indirections with -fPIE -static
> (the only reason to use a GOT indirection is to avoid copy relocations in
> dynamically linked binaries).
>
But -static isn't passed to cc1.
--
H.J.
next prev parent reply other threads:[~2022-08-29 19:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 18:39 Wilco Dijkstra
2022-08-26 19:02 ` H.J. Lu
2022-08-26 19:45 ` Richard Henderson
2022-08-26 20:11 ` H.J. Lu
2022-08-29 11:49 ` Wilco Dijkstra
2022-08-29 13:10 ` Florian Weimer
2022-08-29 15:27 ` Wilco Dijkstra
2022-08-29 15:27 ` Wilco Dijkstra
2022-08-29 19:43 ` H.J. Lu [this message]
2022-08-29 19:57 ` Fangrui Song
2022-09-05 8:58 ` Wilco Dijkstra
2022-09-15 21:45 ` Fangrui Song
2022-09-20 13:59 ` Wilco Dijkstra
2022-09-20 14:12 ` Florian Weimer
2022-09-20 16:00 ` Wilco Dijkstra
2022-09-20 22:02 ` Fangrui Song
-- strict thread matches above, loose matches on Subject: below --
2022-08-25 21:01 Richard Henderson
2022-08-26 12:32 ` Adhemerval Zanella Netto
2022-08-26 17:29 ` Richard Henderson
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