[openssl-dev] [openssl.org #4583] AutoReply: Debian X32 and "fatal error: sys/cdefs.h: No such file or directory"

[noloader@gmail.com via RT]

On Thu, Jun 23, 2016 at 7:10 AM, Andy Polyakov via RT <rt at openssl.org> wrote:
>>>> A quick question about this configuration... Should Linux-x32 enable
>>>> ec_nistp_64_gcc_128 by default? Does anything prohibit
>>>> ec_nistp_64_gcc_128 in this configuration?
>>>>
>>>> # ./Configure linux-x32
>>>> Configuring OpenSSL version 1.1.0-pre6-dev (0x0x10100006L)
>>>>     no-asan         [default]  OPENSSL_NO_ASAN (skip dir)
>>>>     ...
>>>>     no-ec_nistp_64_gcc_128 [default]  OPENSSL_NO_EC_NISTP_64_GCC_128 (skip dir)
>>>>     ...
>>>>
>>>> I believe it meets the three criteria for ec_nistp_64_gcc_128.
>>>
>>> What are "the three criteria"? I mean I'm not really sure. Nor am I sure
>>> that they are perfect. I mean maybe they need some adjustment in x32
>>> context. To either allow or prevent erroneous compilation. Bottom line
>>> is that I don't actually know at this point...
>>
>> My bad... According to my notes, one can use ec_nistp_64_gcc_128 when
>> these three conditions are met:
>>
>>   * Little endian CPU
>>   * CPU allows unaligned data access
>>   * Compiler supports  __uint128_t
>
> Correct. But there still might be nuances. For example first two
> criteria were not actually formulated originally....

Gotcha, thanks.


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