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Re: [PATCH 06/25] Add struct scratch_buffer and its internal helper functions
- From: Florian Weimer <fweimer at redhat dot com>
- To: Joseph Myers <joseph at codesourcery dot com>
- Cc: Paul Eggert <eggert at cs dot ucla dot edu>, libc-alpha at sourceware dot org
- Date: Mon, 23 Mar 2015 19:48:13 +0100
- Subject: Re: [PATCH 06/25] Add struct scratch_buffer and its internal helper functions
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- References: <cover dot 1425285061 dot git dot fweimer at redhat dot com> <7a6fe503fb764beee3d5b89662d3bbf65242161c dot 1425285061 dot git dot fweimer at redhat dot com> <54F4BB15 dot 7070409 at cs dot ucla dot edu> <550C37F7 dot 10504 at redhat dot com> <550C4AE0 dot 60205 at cs dot ucla dot edu> <55103BEA dot 7070305 at redhat dot com> <5510505B dot 8060209 at cs dot ucla dot edu> <alpine dot DEB dot 2 dot 10 dot 1503231839380 dot 14930 at digraph dot polyomino dot org dot uk> <55105F2C dot 6040400 at redhat dot com> <alpine dot DEB dot 2 dot 10 dot 1503231845410 dot 14930 at digraph dot polyomino dot org dot uk>
On 03/23/2015 07:46 PM, Joseph Myers wrote:
> On Mon, 23 Mar 2015, Florian Weimer wrote:
>
>> On 03/23/2015 07:41 PM, Joseph Myers wrote:
>>
>>>> Since C allows platforms where pointers and/or floating-point values have
>>>> alignments stricter than intmax_t, I suggest using 'max (__alignof__
>>>> (intmax_t), __alignof__ (max_align_t))' along with a comment explaining why
>>>> you don't trust max_align_t here.
>>>
>>> max_align_t was added to stddef.h in GCC 4.7, so we can't rely on it in
>>> glibc without appropriate conditionals.
>>
>> We compile glibc in -std=gnu99 mode, and max_align_t appears available.
>> Suggestions?
>
> It's specifically when compiling with GCC 4.6 (the oldest supported
> version) that it won't be available.
Oh, I misread what you wrote. What I was saying is that we can't get it
easily with GCC 4.9.2, either.
--
Florian Weimer / Red Hat Product Security