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H A D | Makefile | 87d599fc3955e59b1ed30f350321a4be5353f945 Tue Dec 13 05:24:20 CST 2022 Masahiro Yamada <masahiroy@kernel.org> kbuild: ensure Make >= 3.82 is used
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>
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