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make: enable SECONDEXPANSION for module/application builds #12708

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Merged
aabadie merged 1 commit into from
Nov 18, 2019
Merged

make: enable SECONDEXPANSION for module/application builds #12708

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9 changes: 9 additions & 0 deletions Makefile.base
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,15 @@ ifeq (, $(__RIOTBUILD_FLAG))
$(error You cannot build a module on its own. Use "make" in your application's directory instead.)
endif

#
# enable second expansion of prerequisites.
#
# Doing that here enables it globally for all modules and the application.
#
# See https://www.gnu.org/software/make/manual/html_node/Secondary-Expansion.html
# for what it can be used for.
.SECONDEXPANSION:

unexport DIRS
DIRS := $(sort $(abspath $(DIRS)))

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