Makefile

   1 # GNU 'make'
   2 #
   3 # 10.2 Catalogue of Built-In Rules
   4 # ================================
   5 #
   6 # Compiling C programs
   7 #      'N.o' is made automatically from 'N.c' with a recipe of the form
   8 #      '$(CC) $(CPPFLAGS) $(CFLAGS) -c'.
   9 #
  10 # Assembling and preprocessing assembler programs
  11 #      'N.o' is made automatically from 'N.s' by running the assembler,
  12 #      'as'.  The precise recipe is '$(AS) $(ASFLAGS)'.
  13 #
  14 #      'N.s' is made automatically from 'N.S' by running the C
  15 #      preprocessor, 'cpp'.  The precise recipe is '$(CPP) $(CPPFLAGS)'.
  16
  17 CPP := arm-none-eabi-cpp
  18 CPPFLAGS :=
  19
  20 AS := arm-none-eabi-as
  21 ASFLAGS :=
  22
  23 CC := arm-none-eabi-gcc
  24 CFLAGS := -march=armv7e-m+fp \
  25                                         -mtune=cortex-m4 \
  26                                         -mthumb \
  27                                         -mfloat-abi=hard \
  28                                         -std=gnu90 \
  29                                         -ffreestanding \
  30                                         -fsingle-precision-constant \
  31                                         -Wall \
  32                                         -Wextra \
  33                                         -Wconversion \
  34                                         -Wstrict-prototypes \
  35                                         -Wshadow \
  36                                         -Wundef \
  37                                         -Wdouble-promotion \
  38                                         -Os
  39
  40 LD := arm-none-eabi-ld
  41 LDFLAGS := -nostdlib
  42 LDLIBS :=
  43
  44 OC := arm-none-eabi-objcopy
  45 OCFLAGS := --output-target=binary
  46
  47 #  ---------------------------------------------------------------------------  #
  48
  49 objs := kernel.o kentry.o
  50 lds := kernel.ld
  51 LDFLAGS += -T $(lds)
  52
  53 elf := kernel.elf
  54 bin := kernel.bin
  55
  56 #  ---------------------------------------------------------------------------  #
  57
  58 all : $(bin)
  59
  60 clean :
  61         rm -f $(bin) $(elf) $(objs)
  62
  63 .PHONY : all clean
  64
  65 $(bin) : $(elf)
  66         $(OC) $(OCFLAGS) $< $@
  67
  68 $(elf) : $(objs) $(lds)
  69         $(LD) $(filter %.o,$^) $(LDFLAGS) $(LDLIBS) -o $@