[PATCH 0/2] libm: Changes to errno and math_errhandling

[Corinna Vinschen]

On Aug  3 10:55, Keith Packard via Newlib wrote:
> Here are a couple of related patches that adjust errno and exception
> configuration stuff.
> 
> The first patch makes libm/common use the same configuration value as
> libm/math to decide whether to set errno when exceptions occur. With
> that, users of libm/math get consistent errno reporting across the
> whole math library when using the normal API. When errno is enabled,
> calls to some __ieee754 symbols may end up setting errno still.
> 
> The second patch sets the math_errhandling value based on library and
> hardware configuration so that applications can tell whether
> exceptions and errno are supported. This requires configuration on a
> per-target basis in machine/ieeefp.h; I've added configuration for
> arm, aarch64, x86, x86_64 and RISC-V. I think this could be automated.
> 
> Reporting on whether exceptions are supported suffers from
> inconsistent exception support for hardware that uses a mixture of
> hardware and software for floating point operations. I haven't found
> any standards-conformant mechanism to use though.
> 

Pushed with v2 of patch 2.


Thanks,
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
Red Hat