extboot/Makefile

   1 OBJCOPY=objcopy
   2
   3 # from kernel sources - scripts/Kbuild.include
   4 # try-run
   5 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
   6 # Exit code chooses option. "$$TMP" is can be used as temporary file and
   7 # is automatically cleaned up.
   8 try-run = $(shell set -e;               \
   9         TMP="$(TMPOUT).$$$$.tmp";       \
  10         if ($(1)) >/dev/null 2>&1;      \
  11         then echo "$(2)";               \
  12         else echo "$(3)";               \
  13         fi;                             \
  14         rm -f "$$TMP")
  15
  16 # cc-option-yn
  17 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
  18 cc-option-yn = $(call try-run,\
  19         $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n)
  20
  21 CFLAGS = -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin
  22 ifeq ($(call cc-option-yn,-fno-stack-protector),y)
  23 CFLAGS += -fno-stack-protector
  24 endif
  25
  26 all: extboot.bin
  27
  28 %.o: %.S
  29         $(CC) $(CFLAGS) -o $@ -c $<
  30
  31 extboot.img: extboot.o
  32         $(LD) --oformat binary -Ttext 0 -o $@ $<
  33
  34 extboot.bin: extboot.img signrom
  35         ./signrom extboot.img extboot.bin
  36
  37 signrom: signrom.c
  38         $(CC) -o $@ -g -Wall $^
  39
  40 clean:
  41         $(RM) *.o *.img *.bin signrom *~