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                                         -pedantic \
  32                                         -pedantic-errors \
  33                                         -Wall \
  34                                         -Wextra \
  35                                         -Wconversion \
  36                                         -Wstrict-prototypes \
  37                                         -Wshadow \
  38                                         -Wundef \
  39                                         -Wdouble-promotion \
  40                                         -Os
  41
  42 LD := arm-none-eabi-ld
  43 LDFLAGS := -nostdlib
  44 LDLIBS :=
  45
  46 OC := arm-none-eabi-objcopy
  47 OCFLAGS := --output-target=binary
  48
  49 #  ---------------------------------------------------------------------------  #
  50
  51 objs := kernel.o
  52 lds := kernel.ld
  53 LDFLAGS += -T $(lds)
  54
  55 elf := kernel.elf
  56 bin := kernel.bin
  57
  58 #  ---------------------------------------------------------------------------  #
  59
  60 all : $(bin)
  61
  62 clean :
  63         rm -f $(bin) $(elf) $(objs)
  64
  65 .PHONY : all clean
  66
  67 $(bin) : $(elf)
  68         $(OC) $(OCFLAGS) $< $@
  69
  70 $(elf) : $(objs) $(lds)
  71         $(LD) $(filter %.o,$^) $(LDFLAGS) $(LDLIBS) -o $@