[patch][rfc] Enabling more optimizations with -ON

Rafael Espíndola rafael.espindola@gmail.com
Mon Nov 10 14:19:00 GMT 2014


On 3 November 2014 11:39, Rafael Espíndola <rafael.espindola@gmail.com> wrote:
> In compilers the -ON options enable various optimizations. Different
> compilers (and compiler versions) have different ones, but the option
> itself is commonly available and selects a somewhat corresponding
> level.
> In both bfd ld and gold very few optimizations are enabled with the
> -ON options. This means that users have to know which optimizations
> are available:
> ld ...-O3 --gc-sections --icf=safe....
> If an optimization is added to one of them, a configure check has to
> be used to find if the program is being linked with gold or bfd (and
> which version).
> As a starting point, the attached patch changes gold to gc sections by
> default if given -O3 or higher. It can still be disabled with an
> explicit --no-gc-sections.
> Cheers,
> Rafael
> 2014-11-03  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>
>         * options.cc (General_options::finalize): Set gc_sections by default
> if -O3 or higher is used.

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