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Date: Sun, 27 Apr 2014 22:51:34 -0700
From: Khem Raj <raj.khem@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH 3/3] stddef: Define max_align_t
On Sun, Apr 27, 2014 at 7:03 PM, Rich Felker <dalias@...c.org> wrote:
> On Sun, Apr 27, 2014 at 06:43:54PM -0700, Khem Raj wrote:
>> c++11 defines is and libstdc++ from gcc 4.9 now needs it
>
> Is it also in C11 or just C++11? If it's not in C11 it needs to be
> namespace protected.
yes its for both so may something like
#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
>
>> Signed-off-by: Khem Raj <raj.khem@...il.com>
>>
>> Upstream-Status: Pending
>> ---
>> include/stddef.h | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/include/stddef.h b/include/stddef.h
>> index 0a32919..788227a 100644
>> --- a/include/stddef.h
>> +++ b/include/stddef.h
>> @@ -19,4 +19,9 @@
>> #define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
>> #endif
>>
>> +typedef struct {
>> + long long __max_align_ll __attribute__((__aligned__(__alignof__(long long))));
>> + long double __max_align_ld __attribute__((__aligned__(__alignof__(long double))));
>> +} max_align_t;
>> +
>
> As far as I can tell, there's no reason to use the attribute here.
> What's it there for? Also a union would probably be nicer than a
> struct, but perhaps it doesn't matter.
union does not return correct alignment where as struct did. I just
tried to match
what clang also has
http://reviews.llvm.org/rL201729
>
> Rich
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