Re: [PATCH] Makefiles are not built using a Fortran compiler

[Ryan Anderson]

On Tue, Feb 08, 2005 at 03:44:17PM +0000, Matthew Wilcox wrote:
> On Tue, Feb 08, 2005 at 01:23:48PM +0100, Roman Zippel wrote:
> > Enabling the following in the Makefile should have the same effect:
> > 
> > # For maximum performance (+ possibly random breakage, uncomment
> > # the following)
> > 
> > #MAKEFLAGS += -rR
> 
> This reduces the debug output even further (and size of debug output is
> strongly correlated with time taken to do a null build):
> 
> -rw-r--r--  1 willy willy 65582214 2005-02-07 21:13 vanilla.debug
> -rw-r--r--  1 willy willy 51413770 2005-02-07 22:17 nosuffixes.debug
> -rw-r--r--  1 willy willy 37245484 2005-02-08 09:56 maxperf.debug
> 
> Seems like it gets rid of the RCS and SCCS rules -- certainly a big
> improvement, and I'm not sure anyone really uses those rules.  Can we
> perhaps uncomment this line at the beginning of 2.6.12 and see if anyone
> complains?  This should reduce make overhead by 30-40% which is really
> worth doing.

The BitKeeper users sometimes make use of the SCCS rules.

BK installs itself in such a way as to provide the SCCS commands, and
Make will update things if you forget to do a bk -r get -Sq after a
pull.

>From a totally clean tree, this doesn't work (I forget why, offhand, but
I think it's something to do with the *config targets), but it is
helpful at times from partially clean trees to automatically "get" from
the SCCS copy of the file.

-- 

Ryan Anderson
  sometimes Pug Majere
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