makefile

   1 include conf.mk
   2
   3 .PHONY:all dirs clean am_i_root help check_env
   4
   5 DIRS=\
   6 $(S_DIR) \
   7 $(OBJ_DIR) \
   8 $(MODULES_DIR) \
   9 $(CPIO_DIR)/dev \
  10 $(CPIO_DIR)/newroot
  11
  12 OBJS=\
  13 $(OBJ_DIR)/init.o \
  14 $(OBJ_DIR)/modules.o \
  15 $(OBJ_DIR)/uevents.o \
  16 $(OBJ_DIR)/uevent.o \
  17 $(OBJ_DIR)/ramfs.o
  18
  19 ULINUX_OBJS=\
  20 $(OBJ_DIR)/decimal.o \
  21 $(OBJ_DIR)/string.o \
  22 $(OBJ_DIR)/mem.o
  23 OBJS+= $(ULINUX_OBJS)
  24
  25 ifndef QUIET
  26 ULINUX_NQUIET_OBJS+= \
  27 $(OBJ_DIR)/vsprintf.o
  28 OBJS+= $(ULINUX_NQUIET_OBJS)
  29 endif
  30
  31 #******************************************************************************
  32 help:
  33         @echo "targets are 'all', 'help'(this output), 'clean'"
  34         @echo -e "you can configure the build with the following variables:\\n\
  35         SYSROOT, KERNEL_VERSION (mandatory), ARCH, MODULES, CC, LD, CFLAGS,\\n\
  36         LDFLAGS (you can tune the conf.mk file)"
  37
  38 all:am_i_root check_env dirs ulinux/arch $(BUILD_DIR)/$(KERNEL_VERSION).cpio.xz
  39
  40 check_env:
  41         @if test -z "$${KERNEL_VERSION}";then echo "Missing KERNEL_VERSION";false;fi
  42
  43 am_i_root:
  44         @if [ $$(whoami) != root ];then echo *ERROR* must be root to build;false;fi
  45
  46 dirs:$(DIRS)
  47 $(DIRS):
  48         -mkdir -p $@
  49
  50 ulinux/arch:
  51         ln -s archs/$(ARCH) ulinux/arch
  52
  53 #===============================================================================
  54 ifndef QUIET
  55 $(S_DIR)/vsprintf.s:ulinux/utils/ascii/string/vsprintf.c
  56         $(CC) $(CFLAGS) $< -o $@
  57 $(OBJ_DIR)/vsprintf.o:$(S_DIR)/vsprintf.s
  58         $(AS) $(ASFLAGS) $< -o $@
  59 endif
  60 #===============================================================================
  61
  62 #===============================================================================
  63 #ulinux objets
  64 $(S_DIR)/mem.s:ulinux/arch/utils/mem.c
  65         $(CC) $(CFLAGS) $< -o $@
  66 $(OBJ_DIR)/mem.o:$(S_DIR)/mem.s
  67         $(AS) $(ASFLAGS) $< -o $@
  68
  69 $(S_DIR)/decimal.s:ulinux/utils/ascii/string/conv/decimal/decimal.c
  70         $(CC) $(CFLAGS) $< -o $@
  71 $(OBJ_DIR)/decimal.o:$(S_DIR)/decimal.s
  72         $(AS) $(ASFLAGS) $< -o $@
  73
  74 $(S_DIR)/string.s:ulinux/utils/ascii/string/string.c
  75         $(CC) $(CFLAGS) $< -o $@
  76 $(OBJ_DIR)/string.o:$(S_DIR)/string.s
  77         $(AS) $(ASFLAGS) $< -o $@
  78 #===============================================================================
  79
  80 #the default kernel included initramfs has /dev/console and more
  81 #the external initramfs is an overlay of this internal default initramfs
  82 #see linux/usr
  83 $(CPIO_DIR)/dev/console:
  84         mknod --mode=0600 $(CPIO_DIR)/dev/console c 5 1
  85
  86 $(BUILD_DIR)/$(KERNEL_VERSION).cpio:$(CPIO_DIR)/init $(CPIO_DIR)/dev/console
  87         chown -R 0:0 $(CPIO_DIR)
  88         DEST_FILE=$$(realpath $(BUILD_DIR))/$(KERNEL_VERSION).cpio;\
  89         cd $(CPIO_DIR);\
  90         find . -print | cpio --format=newc --create >$${DEST_FILE}
  91
  92 $(BUILD_DIR)/$(KERNEL_VERSION).cpio.xz:$(BUILD_DIR)/$(KERNEL_VERSION).cpio
  93         xz --force --check=crc32 --extreme --stdout $< >$@
  94
  95 $(S_DIR)/modules.s:modules.c modules_list.h globals.h
  96         $(CC) $(CFLAGS) $< -o $@
  97 $(OBJ_DIR)/modules.o:$(S_DIR)/modules.s
  98         $(AS) $(ASFLAGS) $< -o $@
  99
 100 $(S_DIR)/uevent.s:uevent.c globals.h
 101         $(CC) $(CFLAGS) $< -o $@
 102 $(OBJ_DIR)/uevent.o:$(S_DIR)/uevent.s
 103         $(AS) $(ASFLAGS) $< -o $@
 104
 105 $(S_DIR)/uevents.s:uevents.c globals.h
 106         $(CC) $(CFLAGS) $< -o $@
 107 $(OBJ_DIR)/uevents.o:$(S_DIR)/uevents.s
 108         $(AS) $(ASFLAGS) $< -o $@
 109
 110 $(S_DIR)/ramfs.s:ramfs.c globals.h
 111         $(CC) $(CFLAGS) $< -o $@
 112 $(OBJ_DIR)/ramfs.o:$(S_DIR)/ramfs.s
 113         $(AS) $(ASFLAGS) $< -o $@
 114
 115 $(S_DIR)/init.s:init.c modules.h uevents.h ramfs.h globals.h
 116         $(CC) $(CFLAGS) $< -o $@
 117 $(OBJ_DIR)/init.o:$(S_DIR)/init.s
 118         $(AS) $(ASFLAGS) $< -o $@
 119
 120 $(CPIO_DIR)/init:$(OBJS)
 121         $(LD) $(LDFLAGS) $(OBJS) --output $@
 122
 123 modules_list.h:
 124         ./script/modules_list.sh >$@
 125
 126 clean:
 127         -rm -f ulinux/arch
 128         -rm -Rf $(BUILD_DIR)
 129         -rm -f modules_list.h