On 11/4/20 2:06 PM, Tom Stellard wrote:
> On 11/4/20 3:57 PM, Jakub Jelinek wrote:
>> On Wed, Nov 04, 2020 at 03:51:40PM -0500, Neal Gompa wrote:
>>>> Well, gcc really should have either weak or strong dependency on
>>>> make too
>>>> given that -flto is now used everywhere.
>>>
>>> The goal of this change seems to include removal of Make as a
>>> dependency for the LTO wrapper used by GCC.
>>
>> That is definitely not something that really happened in GCC, the only
>> change that has been done is to make sure that gcc -flto doesn't fail
>> because of missing make, but missing make will just mean that the
>> compilation will be significantly slower.
>>
>
> My understanding was that the performance of gcc -flto when using
> something other than make (e.g. ninja) to build was the same whether
> or not you have make installed[1].  Is this correct?
>
> I thought you had to be using make to get the parallelization benefits
> of -flto=auto.

It will fall back to #cpu threads available if the jobserver isn't
available.  At least that's how it's supposed to work.


jeff

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