tree fc3b711bb77640ba7e1ec3377f80574561e283f2
parent b5962abb3d4ad90aca107d88e8ab8abd5db3e4db
author Gabe Black <gabe.black@gmail.com> 1614046629 -0800
committer Gabe Black <gabe.black@gmail.com> 1614066760 +0000

scons: Check for "make" when using LTO with gcc.

gcc uses "make" to parallelize LTO. If we're using gcc and make isn't
found, we have to use single threaded LTO instead. A warning will let
the user know what's happening and that they might want to correct the
situation.

Technically gcc can use the MAKE environment variable to override the
program it uses, although I assume it still has to be "make" compatible.
Given the fairly low likelihood that someone will need that override and
the fact that scons won't pipe that variable through unless we plumb it
up, we'll just ignore that for now.

Change-Id: I891b213ece2a75bd8a915ee91f4130458dab397b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41773
Reviewed-by: Earl Ou <shunhsingou@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>