[Libreoffice] gnumake / dependencies 20%+ speedup ...

[Norbert Thiebaud]

On Mon, Sep 5, 2011 at 7:34 AM, Caolán McNamara <caolanm at redhat.com> wrote:
> On Mon, 2011-09-05 at 12:38 +0100, Michael Meeks wrote:
>>       I attach an updated cleanup.pl - that leaves the dummy rules, but
>> removes duplicates in them
>
> Hmm, these dependencies and the pseudo-rules are initially spit out by
> gcc's -MP so...
> a) I'd have expected gcc to list each dependency only once in the first
> place per .c/.cxx file anyway.
> b) And then I'd have expected it to then only emit one dummy rule per
> dependency for those.
>
> Looking at
> workdir/unxlngx6/Dep/CxxObject/sc/source/filter/excel/xepage.d I see
> that for path/to/CxxObject/sc/source/filter/excel/xepage.o there is
> already core/sc/inc/scdllapi.h listed twice as a dependency for
> sc/source/filter/excel/xepage.o and correspondingly two pseudo rules for
> scdllapi.h
>
> Each pseudo-rule I *assume* is spat out by gcc on a one-to-one basis for
> each dependency. So I wonder why gcc for e.g. xepage lists scdllapi.h
> twice ?

could that be a case of
#include "scdllapi.h"
and
#include <scdllapi.h>

?
Norbert