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+#
+# LUFA Library
+# Copyright (C) Dean Camera, 2017.
+#
+# dean [at] fourwalledcubicle [dot] com
+# www.lufa-lib.org
+#
+
+# Makefile to build all the LUFA Host Demos. Call with "make all" to
+# rebuild all Host demos.
+
+# Projects are pre-cleaned before each one is built, to ensure any
+# custom LUFA library build options are reflected in the compiled
+# code.
+
+PROJECT_DIRECTORIES := $(shell ls -d */)
+
+# This makefile is potentially infinitely recursive if something really bad
+# happens when determining the set of project directories - hard-abort if
+# more than 10 levels deep to avoid angry emails.
+ifeq ($(MAKELEVEL), 10)
+ $(error EMERGENCY ABORT: INFINITE RECURSION DETECTED)
+endif
+
+# Need to special-case building without a per-project object directory
+ifeq ($(OBJDIR),)
+ # If no target specified, force "clean all" and disallow parallel build
+ ifeq ($(MAKECMDGOALS),)
+ MAKECMDGOALS := clean all
+ .NOTPARALLEL:
+ endif
+
+ # If one of the targets is to build, force "clean" beforehand and disallow parallel build
+ ifneq ($(findstring all, $(MAKECMDGOALS)),)
+ MAKECMDGOALS := clean $(MAKECMDGOALS)
+ .NOTPARALLEL:
+ endif
+endif
+
+%: $(PROJECT_DIRECTORIES)
+ @echo . > /dev/null
+
+$(PROJECT_DIRECTORIES):
+ @$(MAKE) -C $@ $(MAKECMDGOALS)
+
+.PHONY: $(PROJECT_DIRECTORIES)