phobos unittests not passing with dmd built by clang

[Jacob Carlborg]

On 2012-01-31 19:56, Martin Nowak wrote:
> On Tue, 31 Jan 2012 18:13:29 +0100, Trass3r <un at known.com> wrote:
>
>>> Can anyone confirm this?
>>> If yes, bug in clang, dmd or phobos?
>>
>> Note that the dmd testsuite passes for me.
>
> Clang behaves differently, but it's probably not a bug.
>
> ----
> #include <stdio.h>
> #include <math.h>
>
> int main()
> {
> long double foo = NAN;
> double a = foo;
> double b = NAN;
> double c = fabs(NAN);
> printf("%Lf %d\n", foo, (int)signbit(foo));
> printf("%f %d\n", a, (int)signbit(a));
> printf("%f %d\n", b, (int)signbit(b));
> printf("%f %d\n", c, (int)signbit(c));
> }
> ----
>
> double a = foo; // seems like "FSTP m64fp" doesn't preserve the sign bit
>
> We need to fix the code in PortInitializer::PortInitializer() which
> relies on
> sign preserving of NaN size conversions.

I thought Clang would be compatible with GCC.

-- 
/Jacob Carlborg