[PATCH] Add wcharP.h to hide internal wchar functions [BZ #18822]

[Florian Weimer]

On 11/25/2017 01:13 AM, H.J. Lu wrote:

> diff --git a/sysdeps/generic/wcharP.h b/sysdeps/generic/wcharP.h
> new file mode 100644
> index 0000000000..1a37283bf1
> --- /dev/null
> +++ b/sysdeps/generic/wcharP.h
> @@ -0,0 +1,18 @@
> +/* Internal prototrypes for multibyte and wide character functions.

Typo (in all files).

I think this is architecturally wrong.

We should enhance the toolchain to do this kind of optimization 
automatically (maybe using LTO?).  Or find another way to implement the 
markup in a more centralized fashion, so that once you define an IFUNC 
resolver, the necessary arrangements to avoid a direct call are 
performed automatically.

In any case, these files need documentation what exactly you are trying 
to do.  The wcharP.h name does not match existing usage of *P.h headers. 
  The intent here seems to be not to add any new declarations to 
wcharP.h, only optimize existing declarations.

It's also not clear why you need to replicate ___atribute_pure__ in 
those declarations.

Thanks,
Florian