[bug #63347] make 4.4 change in behavior for sub-make invoked via $(shell)

[Paul D. Smith]

Follow-up Comment #10, bug #63347 (project make):

The problem in the kernel build system is not related to this change; the
issue can also be seen with the released GNU make 4.4 version.

For example, set *MAKEFLAGS* like this in your environment before invoking the
kernel build:

$ export MAKEFLAGS=-I/usr/local/mk

or this:

$ export MAKEFLAGS=-Orecurse


If you use vanilla GNU make 4.4 without this patch, this will force the kernel
into "silent mode".

Basically any flag that (a) uses a single-letter option to introduce it (so it
won't be caught by the kernel build environment's --% filter) and (b) contains
an "s", will cause this problem.

The best way to check GNU make single-letter command line flags is described
in the GNU make manual:
https://www.gnu.org/software/make/manual/make.html#Testing-Flags



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