useless definition of _SV_RULER_CXX ?

[Eike Rathke]

Hi Miklos,

On Friday, 2013-02-15 11:05:37 +0100, Miklos Vajna wrote:

> On Thu, Feb 14, 2013 at 02:43:16PM +0000, Caolán McNamara <caolanm at redhat.com> wrote:
> > My best theory is that it was intended to speed up builds by having less
> > "stuff" in the headers for compilers to parse by having the preprocessor
> > strip out the stuff includers didn't need to see. Which would suggest
> > that it will only be found around private methods, i.e. not
> > protected/public methods or anything that takes up space.
> 
> I think they tried to avoid including headers for enumerations this way
> -- given that in C++ it's not possible to declare enumerations as an
> incomplete type, AFAIK.

No, the actual reason indeed was to speed up compilation. Not having to
include various header files in such cases was welcomed.

Plus the additional benefit that the less symbols the compiler
encountered if these headers were included in other sources the lesser
was the chance to encounter the dreaded "compiler limit: out of keys"
(aka CLOOK, grep for it ;-) error..  That was your source could have
IIRC 64k symbols (identifiers, variable names, classes, methods, values,
...) after that compilation broke, forcing you to split sources into
pieces. Which again is the reason that there are some xxx[1-9a-j].cxx
implementing one class in some modules.

  Eike

(tales from the past teller)

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