[PATCH] Feature test macros overhaul: C++ TR1

[Craig Howland]

On 03/23/2016 05:22 PM, Yaakov Selkowitz wrote:
> On 2016-03-23 16:19, Yaakov Selkowitz wrote:
>> While C++11 was the first version of the standard to use C99 functionality,
>> TR1 (for C++03) also does, and G++ does not distinguish between C++98 and
>> C++03, or when TR1 is in use.  Therefore, while not strictly correct for
>> "pure" C++98, enabling C99 for all C++ usage is the simplest solution (and
>> much better than always using -D_GNU_SOURCE as on Linux).
>>
>> See thread starting: https://sourceware.org/ml/newlib/2016/msg00297.html
>
> This patch to newlib, along with the attached revised patches to GCC 5.3, 
> allow _GLIBCXX_USE_C99 to be enabled for bare-metal targets.
> Newlib is missing support for long double math (real and complex) when
> it is different from double.  However, AFAICS nothing dependent on just
> _GLIBCXX_USE_C99 requires any complex math.
Complex (the entire complex.h) was added in C99, so it should be gated by it.