Re: [perl #74864] test suite failure on powerpc with -Duselongdouble

On Mon, May 03, 2010 at 01:30:34AM -0700, Niko Tyni wrote:

> I'm seeing 5.12.0 test failures on the Debian powerpc architecture
> with -Duselongdouble -Duse64bitint (but not with just -Duse64bitint.)

> I assume the 128-bit long doubles on this platform are actually a sum of
> two 64-bit doubles, which "does not conform to the IEEE floating-point
> standard" [1] and "has serious arithmetic anomalies" [2].

That seems a reasonable assumption, given that sparc64 Debian with 16 byte
long doubles does work.

> If this something that can not be supported, perhaps Configure should
> detect such a platform and disable the longdouble setting or error out?

That seems reasonable. Not sure how to do it.

> (This is also http://bugs.debian.org/578295 )
> 
> [1] http://en.wikipedia.org/wiki/Long_double
> [2] http://gcc.gnu.org/ml/gcc-help/2006-10/msg00138.html 

Nicholas Clark

• [perl #74864] test suite failure on powerpc with -Duselongdouble by Niko Tyni
• Re: [perl #74864] test suite failure on powerpc with -Duselongdouble by Nicholas Clark