[Numpy-discussion] test for long double support

[Lisandro Dalcin]

On 14 September 2010 12:47, Neal Becker <ndbecker2 at gmail.com> wrote:
> Neal Becker wrote:
>
>> What is the recommended way to test for long double and clongdouble?
>>
>> Is it:
>> #if NPY_SIZEOF_LONGDOUBLE == NPY_SIZEOF_DOUBLE
>
> I guess I found it?
>
> #if HAVE_LONG_DOUBLE            // defined in pyconfig.h
>

I think these two are different things. For example, MSVC do support
'long double', it is a different type than 'double', but sizeof(long
double) == sizeof(double).

Also look at CPython's objimpl.h, union _gc_head, you will see an
unprotected usage of 'long double', so it seems that CPython requires
that the C compiler to support 'long double'.


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Lisandro Dalcin
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