From: John Carter <john.carter@...>
Date: 2008-01-16T13:28:31+09:00
Subject: Re: any tricks to speed up ruby? -fwhole-program?

It's an old trick, I believe the kde folks do it (I may be wrong)

Instead of creating lots and lots of .o's and linking them...

Pull all the .c files into one stonking great .c file and compile
that with...

`-fwhole-program'
      Assume that the current compilation unit represents whole program
      being compiled.  All public functions and variables with the
      exception of `main' and those merged by attribute
      `externally_visible' become static functions and in a affect gets
      more aggressively optimized by interprocedural optimizers.  While
      this option is equivalent to proper use of `static' keyword for
      programs consisting of single file, in combination with option
      `--combine' this flag can be used to compile most of smaller scale
      C programs since the functions and variables become local for the
      whole combined compilation unit, not for the single source file
      itself.


Takes forever and needs a huge amount of RAM, but it gives the
optimizer more freedom.

I wonder how hard it would be to tweak the ruby Makefile into doing that?


John Carter                             Phone : (64)(3) 358 6639
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