[PATCH] Add -disable-opt option to LTO

[Cristiano Giuffrida]

Thanks. Yes, I think having a uniform interface across tools (opt,
libLTO, etc.) to selectively enable/disable individual passes (or
"macroconfigurations" like opt's -std-compile-opts) would be really
useful for a variety of reasons. But I think this patch is a good
start in that direction (if anything, you can use the gold plugin to
do optimization-free linking and later use, say, opt to run the passes
you want).

Any chance somebody can commit this patch in time for the upcoming 3.3 release?

Thanks,

Cristiano

On Wed, Feb 27, 2013 at 8:17 PM, Bill Wendling <wendling at apple.com> wrote:
> This patch LGTM. What would be really nice is a way to disable individual passes, but that's beyond the scope of this patch.
>
> -bw
>
> On Feb 26, 2013, at 6:13 PM, Cristiano Giuffrida <giuffrida at cs.vu.nl> wrote:
>
>> Hi,
>> the attached patch adds the -disable-opt option to LTO. The effect is
>> self-explanatory. I think this should be considered for merging
>> (hopefully for the upcoming 3.3 release) for the following reasons:
>>
>> - Consistency with opt (which supports the same option with the same
>> meaning and description).
>> - Debugging gold plugin-based linking without optimizations getting in the way.
>> - Debugging programs linked with the gold plugin while preserving the
>> original debug info.
>> - Fine-grained control over LTO passes using the gold plugin in
>> combination with opt (or clang/dragonegg).
>>
>> Thanks,
>>
>> Cristiano
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