[Buildroot] [PATCH 1/1] fs/common.mk: enable multithreaded xz compression

[Peter Korsgaard]

>>>>> "Peter" == Peter Korsgaard <peter at korsgaard.com> writes:

 >> Does it matter than the output of -T 0 and -T 1 are identical ?

 > It would cause an extra change in output between buildroot versions
 > using -T 0 and ones using -T 1 - But OK, probably that isn't really
 > important given all the other changes.

 > What I really meant was if the -T 1 option affected the output format,
 > and if so, if the difference involved any tradeoff (E.G. perhaps -T 1
 > compresses slightly worse than -T 0) and if repeated runs with -T 1
 > would generate the same output (on same machine or on another machine
 > with different number of threads).

Sorry, got -T 1 and -T 0 mixed up, I meant -T 0 here.

 >> What matters for BR2_REPRODUCIBLE=y is if the same input, with -T 0,
 >> always provide the exact identical output.

 > With the new patch that only enables -T 1 for !reproducible builds,
 > that is correct.

The assumption is that this is not true, especially between systems with
different number of CPUs.

-- 
Bye, Peter Korsgaard