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kbuild: add comment about grouped target
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GNU Make commit 8c888d95f618 ("[SV 8297] Implement "grouped targets"
for explicit rules.") added the '&:' syntax.

I think '&:' is a perfect fit here, but we cannot use it any time
soon. Just add a TODO comment.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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Masahiro Yamada committed Mar 29, 2020
1 parent 735aab1 commit f463c35
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Expand Up @@ -677,6 +677,7 @@ $(KCONFIG_CONFIG):
#
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
else # !may-sync-config
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