make: no need to invoke shell to get dir name
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@ -4,7 +4,7 @@
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all:
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# set undefined variables
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RIOTBASE ?= $(shell dirname "$(lastword $(MAKEFILE_LIST))")
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RIOTBASE ?= $(dir $(lastword $(MAKEFILE_LIST)))
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CCACHE_BASEDIR ?= $(RIOTBASE)
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RIOTCPU ?= $(RIOTBASE)/cpu
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RIOTBOARD ?= $(RIOTBASE)/boards
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