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kbuild: ensure Make >= 3.82 is used

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Documentation/process/changes.rst notes the minimal GNU Make version,
but it is not checked anywhere.

We could check $(MAKE_VERSION), but another simple way is to check
$(.FEATURES) since the feature list always grows.

GNU Make 3.81 expands $(.FEATURES) to:
  target-specific order-only second-expansion else-if archives jobserver check-symlink

GNU Make 3.82 expands $(.FEATURES) to:
  target-specific order-only second-expansion else-if shortest-stem undefine archives jobserver check-symlink

To ensure Make >= 3.82, you can check either 'shortest-stem' or
'undefine'.

This way is not always possible. For example, Make 4.0 through 4.2 have
the same set of $(.FEATURES). At that point, we will need to come up
with a different approach.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada 2022-12-13 20:24:20 +09:00
parent 3d57e1b7b1
commit 87d599fc39
1 changed files with 4 additions and 0 deletions
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4
Makefile
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@ -11,6 +11,10 @@ NAME = Hurr durr I'ma ninja sloth
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
ifeq ($(filter undefine,$(.FEATURES)),)
$(error GNU Make >= 3.82 is required. Your Make version is $(MAKE_VERSION))
endif
$(if $(filter __%, $(MAKECMDGOALS)), \
$(error targets prefixed with '__' are only for internal use))