Makefile

   1 # Copyright 2010 Google Inc.
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #      http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 #
  15 # $Id$
  16
  17 BUILD_DATE = \"$(shell date -u)\"
  18 BUILD_SHORT_DATE = \"$(shell date -u +%D)\"
  19 BUILD_HOST = \"$(shell hostname)\"
  20 BUILD_USER = \"$(shell whoami)\"
  21
  22 CFLAGS := -Wall -Os -m32 -nostdlib
  23
  24 ASFLAGS := $(CFLAGS)
  25 ASFLAGS += -DBUILD_DATE="$(BUILD_DATE)"
  26 ASFLAGS += -DBUILD_SHORT_DATE="$(BUILD_SHORT_DATE)"
  27 ASFLAGS += -DBUILD_HOST="$(BUILD_HOST)"
  28 ASFLAGS += -DBUILD_USER="$(BUILD_USER)"
  29
  30 LDSCRIPT := rom16.ld
  31 LDFLAGS := -T $(LDSCRIPT) -nostdlib
  32 OBJCOPY := objcopy
  33
  34 ASRCS = sgabios.S
  35
  36 CSRCS =
  37
  38 SRCS = $(CSRCS) $(ASRCS)
  39
  40 OBJS = ${CSRCS:.c=.o} ${ASRCS:.S=.o}
  41 INCS = ${CSRCS:.c=.h} ${ASRCS:.S=.h}
  42
  43 PROGS = sgabios.bin csum8
  44
  45 .SUFFIXES: .bin .elf
  46 .PHONY: buildinfo
  47
  48 all: $(PROGS)
  49
  50 sgabios.bin: sgabios.elf
  51         $(OBJCOPY) -O binary $< $@
  52         ./csum8 $@
  53
  54 sgabios.elf: .depend $(OBJS) $(LDSCRIPT) csum8
  55         $(LD) $(LDFLAGS) $(OBJS) -o $@
  56
  57 csum8: csum8.c
  58         $(CC) -Wall -O2 -o $@ $<
  59
  60 sgabios.o: buildinfo
  61
  62
  63 buildinfo:
  64         touch sgabios.S
  65 clean:
  66         $(RM) $(PROGS) $(OBJS) *.elf *.srec *.com version.h
  67
  68 .depend:: $(INCS) $(SRCS) Makefile
  69         $(RM) .depend
  70         $(CPP) -M $(CFLAGS) $(SRCS) >.tmpdepend && mv .tmpdepend .depend
  71
  72 ifeq (.depend, $(wildcard .depend))
  73 include .depend
  74 else
  75 # if no .depend file existed, add a make clean to the end of building .depend
  76 .depend::
  77         $(MAKE) clean
  78 endif