[Bug manual/33752] Doc incorrectly says double and long double may not be distinct

Paul Zimmermann Paul.Zimmermann@inria.fr
Sat Jan 3 07:18:49 GMT 2026


       Hi Keith,

the new formulation is much clearer, thanks.

Reviewed-by: Paul Zimmermann <Paul.Zimmermann@inria.fr>

Happy New Year to everybody on this list!

Paul

> From: Keith Thompson <Keith.S.Thompson@gmail.com>
> Date: Fri, 2 Jan 2026 09:43:10 -0800
> Cc: Keith Thompson <Keith.S.Thompson@gmail.com>
> 
> I submitted a documentation bug and patch:
> https://sourceware.org/bugzilla/show_bug.cgi?id=33752
> 
> I was asked to send it to libc-alpha for proper review.
> 
> The patch:
> 
> commit ad55478fceac3dd4aa651eb20b97749b6df366d9 (HEAD ->
> long-double-is-distinct)
> Author: Keith Thompson <Keith.S.Thompson@gmail.com>
> Date:   2025-12-30 03:29:34 -0800
> 
>     long double and double are distinct types
> 
> diff --git manual/math.texi manual/math.texi
> index fbabf37b48..074cf835e3 100644
> --- manual/math.texi
> +++ manual/math.texi
> @@ -50,8 +50,8 @@ situation.  For most calculations, the @code{float}
> functions are the
>  fastest.  On the other hand, the @code{long double} functions have the
>  highest precision.  @code{double} is somewhere in between.  It is
>  usually wise to pick the narrowest type that can accommodate your data.
> -Not all machines have a distinct @code{long double} type; it may be the
> -same as @code{double}.
> +Not all machines have a @code{long double} type that's wider than
> +@code{double}, though they're still distinct types.
> 
>  @Theglibc{} also provides @code{_Float@var{N}} and
>  @code{_Float@var{N}x} types.  These types are defined in @w{ISO/IEC TS
> 
> 
> On Fri, Jan 2, 2026 at 6:20 AM adhemerval.zanella at linaro dot org
> <sourceware-bugzilla@sourceware.org> wrote:
> >
> > https://sourceware.org/bugzilla/show_bug.cgi?id=33752
> >
> > Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
> >
> >            What    |Removed                     |Added
> > ----------------------------------------------------------------------------
> >                  CC|                            |adhemerval.zanella at linaro dot o
> >                    |                            |rg
> >
> > --- Comment #1 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
> > The patch look ok, could you send it to libc-alpha for proper review?
> >
> > --
> > You are receiving this mail because:
> > You reported the bug.
> 


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