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# Based on "http://iany.me/wiki/Makefile/" by "Ian Yang" licensed under "CC by 3.0"
BUILD_FOLDER := _build
CUSTOM_TARGETS := cmake
# Do not try to use custom target when invoking external makefile
EXTERNAL_TARGETS := $(filter-out $(CUSTOM_TARGETS), $(MAKECMDGOALS))
# Call all targets using `Makefile` in build directory in one `make` command.
$(or $(lastword $(EXTERNAL_TARGETS)),all):
$(MAKE) -C $(BUILD_FOLDER) $(EXTERNAL_TARGETS)
# If no targets are specified, use the dummy `all` target
.PHONY: $(EXTERNAL_TARGETS) all
# Do nothing for all targets but last. Also quiet the message "Noting to be done on xxx"
$(filter-out $(lastword $(EXTERNAL_TARGETS)), $(EXTERNAL_TARGETS)):
@cd .
cmake: $(BUILD_FOLDER)
cd $(BUILD_FOLDER) && cmake ..
$(BUILD_FOLDER):
mkdir $(BUILD_FOLDER)
.PHONY: cmake
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