Status of fenv.h header and floating point environment support in newlib

[Vaibhav Gupta]

On Mon, Feb 17, 2020, 3:07 PM Ayush Dwivedi <21cencturyayush at gmail.com>
wrote:

> Hello Joel,
> This is regarding the open project #2966 POSIX-Compliance #2971( Add
> fenv.h to newlib). The task is about adding the floating point environment
> header to the newlib library but the source code of the library already has
> the header with the listed function declarations and data struct as needed.
> The implementations for the following architectures are available in the
> newlib-cygwin repository:
> >RISCV
> >i386
> >x86_64
> As pointed out in the POSIX Compliance project sub-task page the
> implementations for following architectures are yet to be added:
> >ARM(software float implementation for this exists but no fenv
> implementation)
> >AArch64(software float implementation for this exists but no fenv
> implementation)
> >SPARC and SPARC64(directories for these architectures are missing from
> libm/machine/ so no implementation of any sort)
>
> I would like to try and implement the functions declared in the header
> using BSD libc of FreeBSD as reference for the ARM and SPARC architectures.
>
> Following is the output after running test for posix fenv
> header(psxfenv01.exe) for SPARC using sparc-rtems5-sis and
> sparc-rtems5-gdb.(The Test failed)
>
Yes because testsuite needs modifications and moreover fenv on SPARC is not
yet supported. Since the support for RISCV and x86_64 is present, you can
make a testsuite for them. You can use qemu for running riscv files.

--Vaibhav

>
> Regards,
> Ayush Dwivedi
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