config.mk 7.9 KB

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  1. #
  2. # (C) Copyright 2000-2006
  3. # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. #
  5. # See file CREDITS for list of people who contributed to this
  6. # project.
  7. #
  8. # This program is free software; you can redistribute it and/or
  9. # modify it under the terms of the GNU General Public License as
  10. # published by the Free Software Foundation; either version 2 of
  11. # the License, or (at your option) any later version.
  12. #
  13. # This program is distributed in the hope that it will be useful,
  14. # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. # GNU General Public License for more details.
  17. #
  18. # You should have received a copy of the GNU General Public License
  19. # along with this program; if not, write to the Free Software
  20. # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. # MA 02111-1307 USA
  22. #
  23. #########################################################################
  24. ifneq ($(OBJTREE),$(SRCTREE))
  25. ifeq ($(CURDIR),$(SRCTREE))
  26. dir :=
  27. else
  28. dir := $(subst $(SRCTREE)/,,$(CURDIR))
  29. endif
  30. obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  31. src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  32. $(shell mkdir -p $(obj))
  33. else
  34. obj :=
  35. src :=
  36. endif
  37. # clean the slate ...
  38. PLATFORM_RELFLAGS =
  39. PLATFORM_CPPFLAGS =
  40. PLATFORM_LDFLAGS =
  41. #########################################################################
  42. HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
  43. $(HOSTCPPFLAGS)
  44. HOSTSTRIP = strip
  45. #
  46. # Mac OS X / Darwin's C preprocessor is Apple specific. It
  47. # generates numerous errors and warnings. We want to bypass it
  48. # and use GNU C's cpp. To do this we pass the -traditional-cpp
  49. # option to the compiler. Note that the -traditional-cpp flag
  50. # DOES NOT have the same semantics as GNU C's flag, all it does
  51. # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
  52. #
  53. # Apple's linker is similar, thanks to the new 2 stage linking
  54. # multiple symbol definitions are treated as errors, hence the
  55. # -multiply_defined suppress option to turn off this error.
  56. #
  57. ifeq ($(HOSTOS),darwin)
  58. # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
  59. DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
  60. DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')
  61. os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
  62. $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
  63. # Snow Leopards build environment has no longer restrictions as described above
  64. HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
  65. HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
  66. HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
  67. else
  68. HOSTCC = gcc
  69. endif
  70. ifeq ($(HOSTOS),cygwin)
  71. HOSTCFLAGS += -ansi
  72. endif
  73. # We build some files with extra pedantic flags to try to minimize things
  74. # that won't build on some weird host compiler -- though there are lots of
  75. # exceptions for files that aren't complaint.
  76. HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
  77. HOSTCFLAGS += -pedantic
  78. #########################################################################
  79. #
  80. # Option checker (courtesy linux kernel) to ensure
  81. # only supported compiler options are used
  82. #
  83. cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
  84. > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
  85. #
  86. # Include the make variables (CC, etc...)
  87. #
  88. AS = $(CROSS_COMPILE)as
  89. LD = $(CROSS_COMPILE)ld
  90. CC = $(CROSS_COMPILE)gcc
  91. CPP = $(CC) -E
  92. AR = $(CROSS_COMPILE)ar
  93. NM = $(CROSS_COMPILE)nm
  94. LDR = $(CROSS_COMPILE)ldr
  95. STRIP = $(CROSS_COMPILE)strip
  96. OBJCOPY = $(CROSS_COMPILE)objcopy
  97. OBJDUMP = $(CROSS_COMPILE)objdump
  98. RANLIB = $(CROSS_COMPILE)RANLIB
  99. #########################################################################
  100. # Load generated board configuration
  101. sinclude $(OBJTREE)/include/autoconf.mk
  102. sinclude $(OBJTREE)/include/config.mk
  103. # Some architecture config.mk files need to know what CPUDIR is set to,
  104. # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
  105. # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
  106. # CPU-specific code.
  107. CPUDIR=arch/$(ARCH)/cpu/$(CPU)
  108. ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
  109. CPUDIR=arch/$(ARCH)/cpu
  110. endif
  111. sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules
  112. sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules
  113. ifdef SOC
  114. sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
  115. endif
  116. ifdef VENDOR
  117. BOARDDIR = $(VENDOR)/$(BOARD)
  118. else
  119. BOARDDIR = $(BOARD)
  120. endif
  121. ifdef BOARD
  122. sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
  123. endif
  124. #########################################################################
  125. ifneq (,$(findstring s,$(MAKEFLAGS)))
  126. ARFLAGS = cr
  127. else
  128. ARFLAGS = crv
  129. endif
  130. RELFLAGS= $(PLATFORM_RELFLAGS)
  131. DBGFLAGS= -g # -DDEBUG
  132. OPTFLAGS= -Os #-fomit-frame-pointer
  133. OBJCFLAGS += --gap-fill=0xff
  134. gccincdir := $(shell $(CC) -print-file-name=include)
  135. CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
  136. -D__KERNEL__
  137. ifneq ($(CONFIG_SYS_TEXT_BASE),)
  138. CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
  139. endif
  140. ifneq ($(RESET_VECTOR_ADDRESS),)
  141. CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
  142. endif
  143. ifneq ($(OBJTREE),$(SRCTREE))
  144. CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
  145. endif
  146. CPPFLAGS += -I$(TOPDIR)/include
  147. CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \
  148. -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
  149. ifdef BUILD_TAG
  150. CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
  151. -DBUILD_TAG='"$(BUILD_TAG)"'
  152. else
  153. CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
  154. endif
  155. CFLAGS += $(call cc-option,-fno-stack-protector)
  156. # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
  157. # option to the assembler.
  158. AFLAGS_DEBUG :=
  159. # turn jbsr into jsr for m68k
  160. ifeq ($(ARCH),m68k)
  161. ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
  162. AFLAGS_DEBUG := -Wa,-gstabs,-S
  163. endif
  164. endif
  165. AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
  166. LDFLAGS += $(PLATFORM_LDFLAGS)
  167. LDFLAGS_FINAL += -Bstatic
  168. LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
  169. ifneq ($(CONFIG_SYS_TEXT_BASE),)
  170. LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
  171. endif
  172. # Location of a usable BFD library, where we define "usable" as
  173. # "built for ${HOST}, supports ${TARGET}". Sensible values are
  174. # - When cross-compiling: the root of the cross-environment
  175. # - Linux/ppc (native): /usr
  176. # - NetBSD/ppc (native): you lose ... (must extract these from the
  177. # binutils build directory, plus the native and U-Boot include
  178. # files don't like each other)
  179. #
  180. # So far, this is used only by tools/gdb/Makefile.
  181. ifeq ($(HOSTOS),darwin)
  182. BFD_ROOT_DIR = /usr/local/tools
  183. else
  184. ifeq ($(HOSTARCH),$(ARCH))
  185. # native
  186. BFD_ROOT_DIR = /usr
  187. else
  188. #BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386
  189. #BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386
  190. BFD_ROOT_DIR = /opt/powerpc
  191. endif
  192. endif
  193. #########################################################################
  194. export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
  195. AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
  196. export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
  197. #########################################################################
  198. # Allow boards to use custom optimize flags on a per dir/file basis
  199. BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
  200. ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
  201. ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
  202. $(obj)%.s: %.S
  203. $(CPP) $(ALL_AFLAGS) -o $@ $<
  204. $(obj)%.o: %.S
  205. $(CC) $(ALL_AFLAGS) -o $@ $< -c
  206. $(obj)%.o: %.c
  207. $(CC) $(ALL_CFLAGS) -o $@ $< -c
  208. $(obj)%.i: %.c
  209. $(CPP) $(ALL_CFLAGS) -o $@ $< -c
  210. $(obj)%.s: %.c
  211. $(CC) $(ALL_CFLAGS) -o $@ $< -c -S
  212. #########################################################################
  213. # If the list of objects to link is empty, just create an empty built-in.o
  214. cmd_link_o_target = $(if $(strip $1),\
  215. $(LD) $(LDFLAGS) -r -o $@ $1,\
  216. rm -f $@; $(AR) rcs $@ )
  217. #########################################################################