From: Siddhesh Poyarekar <siddhesh@gotplt.org>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
"H.J. Lu" <hjl.tools@gmail.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Siddhesh Poyarekar <siddhesh@sourceware.org>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH] New option --enable-pie-programs
Date: Thu, 18 Nov 2021 18:56:00 +0530 [thread overview]
Message-ID: <c867421e-398e-d369-2c67-919bce3f6cda@gotplt.org> (raw)
In-Reply-To: <c55b710b-4e56-6aec-00b0-53db94bda09b@linaro.org>
On 11/18/21 18:19, Adhemerval Zanella wrote:
>
>
> On 18/11/2021 09:42, H.J. Lu via Libc-alpha wrote:
>> On Thu, Nov 18, 2021 at 1:24 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>>>
>>> On 11/17/21 15:34, Siddhesh Poyarekar via Libc-alpha wrote:
>>>> I suppose you're right. That is current behaviour with
>>>> --enable-static-pie too; wouldn't a similar argument hold for
>>>> --enable-static-pie=no? Or is the rationale in that case is that
>>>> *static-pie* is disabled, not pie itself and hence the default PIE
>>>> toolchain could get away with building PIE dynamic programs, just not
>>>> static ones?
>>>>
>>>> I wonder if the clearer option is to have a new
>>>> --enable-pie=<no|dynamic|yes/full>, where "no" disables PIE (even on
>>>> default-PIE toolchains), "dynamic" enables PIE for dynamic programs and
>>>> "full" or "yes" enables static-pie on architectures that support it,
>>>> terminating with an error if it's not supported. --enable-static-pie=no
>>>> could then imply --enable-pie=dynamic and could be deprecated. I don't
>>>> remember if we have ever deprecated configure flags before.
>>>>
>>>> Even simpler, we could have just a yes/no option and enable static-pie
>>>> transparently on architectures that support it, making an explicit
>>>> --enable-static-pie=no equivalent to disabling all PIE. It may in
>>>> theory break a use case but I don't know if there's actually a use case
>>>> where one would strictly want only dynamic PIE and not static PIE.
>>>
>>> A third option (as we discussed offlist yesterday) could be to always
>>> build glibc dynamic programs as PIE as long as the toolchain supports
>>> it. Would non-distribution use cases be adversely affected by not
>>> having an option to produce non-PIE glibc programs, e.g. iconvconfig,
>>> getconf, etc.?
>>
>> How about --enable-default-pie?
HJ, could you describe how you'd expect it to behave? Would it map to
any of the options I describe above?
> Another option would be to --enable-pie=<no,auto> where 'no' disables PIE
> for both both static and dynamic installed programs and 'auto' checks
> compiler support and enables for everything. I would like to provide less
> options which results in less permutations to test.
OK, that sounds like the two option alternative I described above.
Siddhesh
next prev parent reply other threads:[~2021-11-18 13:26 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 13:52 Siddhesh Poyarekar
2021-11-16 13:58 ` Florian Weimer
2021-11-16 15:17 ` Siddhesh Poyarekar
2021-11-17 8:39 ` Florian Weimer
2021-11-17 8:50 ` Siddhesh Poyarekar
2021-11-17 9:10 ` Florian Weimer
2021-11-17 10:04 ` Siddhesh Poyarekar
2021-11-18 9:24 ` Siddhesh Poyarekar
2021-11-18 12:42 ` H.J. Lu
2021-11-18 12:49 ` Adhemerval Zanella
2021-11-18 13:26 ` Siddhesh Poyarekar [this message]
2021-11-18 13:41 ` H.J. Lu
2021-11-18 16:36 ` Siddhesh Poyarekar
2021-11-18 16:44 ` H.J. Lu
2021-11-18 16:49 ` Siddhesh Poyarekar
2021-11-18 16:56 ` H.J. Lu
2021-11-18 17:54 ` Siddhesh Poyarekar
2021-11-18 17:58 ` H.J. Lu
2021-11-18 18:09 ` Siddhesh Poyarekar
2021-11-18 18:18 ` H.J. Lu
2021-11-22 23:40 ` Fangrui Song
2021-11-24 1:04 ` Fāng-ruì Sòng
2021-11-24 1:27 ` Siddhesh Poyarekar
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