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make: enable SECONDEXPANSION for module/application builds

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This commit is contained in:
Kaspar Schleiser 2019-11-14 12:12:18 +01:00
parent 57e791fcc9
commit 1ca277d914
1 changed files with 9 additions and 0 deletions
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9
Makefile.base
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@ -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)))