[PATCH] libc: Replace i386/sys/fenv.h symlink with an #include shim

[Joel Sherrill]

On Sat, Mar 13, 2021, 12:11 PM David Macek via Newlib <newlib@sourceware.org>
wrote:

> > > More to the point, how big of an issue would be to duplicate the file?
> >
> > I'm not hot on duplicating an identical file, it just raises maintenance
> > cost.  I'm currently looking into a solution to share the file without
> > duplicating it.
>
> Something like a Makefile rule?
>

The include file set for newlib already merges files from multiple
directories in a specific order and I recall (maybe incorrectly) that they
aren't merged during the build but the include path is carefully managed.

Is there a place put a shared file and have a one liner in both targets?
The problem I see here is that this is an odd case where two architectures
share the same code and you need a common include directory. For RTEMS,
this isn't unusual and our build system accounts for this well. But this is
an outlier for newlib.

Maybe a mix of a unique shared filename that is included and a secondary
machine directory being added to the include processing.

Just thinking out loud. There is an overarching pattern to how the shared,
machine, and system include directories are processed and I think any
solution to avoid symbolic links across architectures is going to have to
account for that.

--joel

>
> --
> David Macek
>