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