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

Rafael Espíndola rafael.espindola@gmail.com
Wed Nov 19 00:01:00 GMT 2014

ping 2

On 10 November 2014 09:19, Rafael Espíndola <rafael.espindola@gmail.com> wrote:
> ping
> 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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