I thought Linux did LTO but not PGO?

On Tue, Apr 5, 2016 at 3:53 PM, Mike Hommey <m...@glandium.org> wrote:
> On Tue, Apr 05, 2016 at 09:02:09PM +0100, David Burns wrote:
>> Below is a highlight of all work the build peers have done in the last 2
>> weeks as part of their work to modernise the build infrastructure.
>>
>> Since the last report[1] a large number of improvements have landed in
>> Mozilla Central.
>>
>> The build system now lazily installs test files. Before, the build copied
>> tens of thousands of test and support files. This could take dozens of
>> seconds on Windows or machines with slow I/O. Now, the build system defers
>> installing test files until they are needed there (e.g. when running tests
>> or creating test packages). Furthermore, only the test files relevant to
>> the action performed are installed. Mach commands running tests should be
>> significantly faster, as they no longer examine the state of tens of
>> thousands of files on every invocation.
>>
>> After upgrading build machines to use VS2015, we have seen a decrease in
>> build times[2] for PGO on Windows by around 100 minutes. This brings PGO
>> times on Windows in line with that of PGO(Strictly speaking this is LTO)
>> times on Linux.
>
> Just a nit: strictly speaking Windows builds do PGO+LTO, Linux builds do
> PGO, but not LTO.
>
> Mike
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