git subrepo clone https://github.com/libopencm3/libopencm3

subrepo:
  subdir:   "libopencm3"
  merged:   "f5813a54"
upstream:
  origin:   "https://github.com/libopencm3/libopencm3"
  branch:   "master"
  commit:   "f5813a54"
git-subrepo:
  version:  "0.4.3"
  origin:   "???"
  commit:   "???"

libopencm3/lib/Makefile.include

@@ -0,0 +1,49 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+## Copyright (C) 2012 Piotr Esden-Tempski <piotr@esden.net>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+# Be silent per default, but 'make V=1' will show all compiler calls.
+ifneq ($(V),1)
+Q := @
+endif
+
+# common objects
+OBJS += vector.o systick.o scb.o nvic.o assert.o sync.o dwt.o
+
+# Slightly bigger .elf files but gains the ability to decode macros
+DEBUG_FLAGS ?= -ggdb3
+STANDARD_FLAGS ?= -std=c99
+
+all: $(SRCLIBDIR)/$(LIBNAME).a
+
+$(SRCLIBDIR)/$(LIBNAME).a: $(OBJS)
+	@printf "  AR      $(LIBNAME).a\n"
+	$(Q)$(AR) $(ARFLAGS) "$@" $(OBJS)
+
+%.o: %.c
+	@printf "  CC      $(<F)\n"
+	$(Q)$(CC) $(TGT_CFLAGS) $(CFLAGS) -o $@ -c $<
+
+clean:
+	$(Q)rm -f *.o *.d ../*.o ../*.d
+	$(Q)rm -f $(SRCLIBDIR)/$(LIBNAME).a
+
+.PHONY: clean
+
+-include $(OBJS:.o=.d)