[openssl-dev] [openssl.org #4479] OS X 10.8 (x86_64): Compile errors when using "no-asm -ansi"

[Jeffrey Walton]

On Fri, Mar 25, 2016 at 12:49 PM, Richard Levitte via RT <rt at openssl.org> wrote:
> Vid Fre, 25 Mar 2016 kl. 16.31.14, skrev noloader at gmail.com:
>> To configure:
>>
>> ./config shared no-asm -ansi -D_DEFAULT_SOURCE=__STRICT_ANSI__
>>
>> I'm not sure if Configure should set _DEFAULT_SOURCE=__STRICT_ANSI__
>> automatically.
>
> Why do you give it the value __STRICT_ANSI__? All documentation I find suggests
> it's enough to simply define it. See man page feature_test_macros(7) on Linux
> (at least)
>
> The alternative is, of course, to define _DEFAULT_SOURCE in the files where
> -ansi becomes a problem.

That was based on examining /usr/include/features.h and the comment
for _DEFAULT_SOURCE:

    _DEFAULT_SOURCE The default set of features (taking precedence
over __STRICT_ANSI__).

How do you convey features by just defining it? It seems like it needs
an argument, like _DEFAULT_SOURCE=__STRICT_ANSI__ or
_DEFAULT_SOURCE=_POSIX_SOURCE.

But its definitely not my area of expertise. I've never had to define to before.

Jeff