Demos/Host/LowLevel/makefile

   1 #
   2 #             LUFA Library
   3 #     Copyright (C) Dean Camera, 2013.
   4 #
   5 #  dean [at] fourwalledcubicle [dot] com
   6 #           www.lufa-lib.org
   7 #
   8
   9 # Makefile to build all the LUFA Host Demos. Call with "make all" to
  10 # rebuild all Host demos.
  11
  12 # Projects are pre-cleaned before each one is built, to ensure any
  13 # custom LUFA library build options are reflected in the compiled
  14 # code.
  15
  16 PROJECT_DIRECTORIES := $(shell ls -d */)
  17
  18 # This makefile is potentially infinitely recursive if something really bad
  19 # happens when determining the set of project directories - hard-abort if
  20 # more than 10 levels deep to avoid angry emails.
  21 ifeq ($(MAKELEVEL), 10)
  22    $(error EMERGENCY ABORT: INFINITE RECURSION DETECTED)
  23 endif
  24
  25 # Need to special-case building without a per-project object directory
  26 ifeq ($(OBJDIR),)
  27    # If no target specified, force "clean all" and disallow parallel build
  28    ifeq ($(MAKECMDGOALS),)
  29       MAKECMDGOALS := clean all
  30       .NOTPARALLEL:
  31    endif
  32
  33    # If one of the targets is to build, force "clean" beforehand and disallow parallel build
  34    ifneq ($(findstring all, $(MAKECMDGOALS)),)
  35       MAKECMDGOALS := clean $(MAKECMDGOALS)
  36       .NOTPARALLEL:
  37    endif
  38 endif
  39
  40 %: $(PROJECT_DIRECTORIES)
  41         @echo . > /dev/null
  42
  43 $(PROJECT_DIRECTORIES):
  44         @$(MAKE) -C $@ $(MAKECMDGOALS)
  45
  46 .PHONY: $(PROJECT_DIRECTORIES)