Re: stop using P_, __P in header files

[Dan Nicolaescu]

Eli Zaretskii <address@hidden> writes:

>> From: Juanma Barranquero <address@hidden>
>> Date: Mon, 5 Jul 2010 05:38:05 +0200
>> Cc: address@hidden, Ken Raeburn <address@hidden>, address@hidden
>> 
>> On Mon, Jul 5, 2010 at 05:05, Eli Zaretskii <address@hidden> wrote:
>> 
>> > Emacs is compiled not only by GCC.
>> 
>> True, but "register" never was more than a hint to the compiler.
>
> I'm not an expert, so I don't know.  Maybe someone else could chime
> in.  One issue that I'd be interested in is to know whether GCC uses
> this hint at some low optimization level, because I frequently need to
> use -O1 or -O0 to get a binary I can debug without getting older by
> the hour.
>
>> Surely most modern compilers do a better work on optimizing code on
>> their own than relying on naive register declarations...
>
> FWIW, the ones I put in some code I wrote long ago were not naive at
> all.  And I don't think those we have in Emacs are naive, either.  But
> if these hints are not used, it doesn't really matter.

Why don't you try if it makes any difference?
Add 
#define register
at the beginning of a C file, after all the #includes and then check if there's 
any code
generation difference.