xref: /openbmc/u-boot/config.mk (revision 04735e9c5578dd4f3584be5454b9779e8e5c2af9)
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#########################################################################
25
26# Set shell to bash if possible, otherwise fall back to sh
27SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
28	else if [ -x /bin/bash ]; then echo /bin/bash; \
29	else echo sh; fi; fi)
30
31export	SHELL
32
33ifeq ($(CURDIR),$(SRCTREE))
34dir :=
35else
36dir := $(subst $(SRCTREE)/,,$(CURDIR))
37endif
38
39ifneq ($(OBJTREE),$(SRCTREE))
40# Create object files for SPL in a separate directory
41ifeq ($(CONFIG_SPL_BUILD),y)
42obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
43else
44obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
45endif
46src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
47
48$(shell mkdir -p $(obj))
49else
50# Create object files for SPL in a separate directory
51ifeq ($(CONFIG_SPL_BUILD),y)
52obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
53
54$(shell mkdir -p $(obj))
55else
56obj :=
57endif
58src :=
59endif
60
61# clean the slate ...
62PLATFORM_RELFLAGS =
63PLATFORM_CPPFLAGS =
64PLATFORM_LDFLAGS =
65
66#########################################################################
67
68HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
69		  $(HOSTCPPFLAGS)
70HOSTSTRIP	= strip
71
72#
73# Mac OS X / Darwin's C preprocessor is Apple specific.  It
74# generates numerous errors and warnings.  We want to bypass it
75# and use GNU C's cpp.	To do this we pass the -traditional-cpp
76# option to the compiler.  Note that the -traditional-cpp flag
77# DOES NOT have the same semantics as GNU C's flag, all it does
78# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
79#
80# Apple's linker is similar, thanks to the new 2 stage linking
81# multiple symbol definitions are treated as errors, hence the
82# -multiply_defined suppress option to turn off this error.
83#
84
85ifeq ($(HOSTOS),darwin)
86# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
87DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
88DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')
89
90os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
91	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
92
93# Snow Leopards build environment has no longer restrictions as described above
94HOSTCC		 = $(call os_x_before, 10, 5, "cc", "gcc")
95HOSTCFLAGS	+= $(call os_x_before, 10, 4, "-traditional-cpp")
96HOSTLDFLAGS	+= $(call os_x_before, 10, 5, "-multiply_defined suppress")
97else
98HOSTCC		= gcc
99endif
100
101ifeq ($(HOSTOS),cygwin)
102HOSTCFLAGS	+= -ansi
103endif
104
105# We build some files with extra pedantic flags to try to minimize things
106# that won't build on some weird host compiler -- though there are lots of
107# exceptions for files that aren't complaint.
108
109HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
110HOSTCFLAGS	+= -pedantic
111
112#########################################################################
113#
114# Option checker, gcc version (courtesy linux kernel) to ensure
115# only supported compiler options are used
116#
117CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
118CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
119
120-include $(CC_OPTIONS_CACHE_FILE)
121
122cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
123		if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
124		> /dev/null 2>&1; then \
125		echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
126		echo "$(1)"; fi)
127
128ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
129cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
130else
131cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
132		$(if $(call cc-option-sys,$1),$1,$2)))
133endif
134
135# cc-version
136# Usage gcc-ver := $(call cc-version)
137cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
138binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))
139
140#
141# Include the make variables (CC, etc...)
142#
143AS	= $(CROSS_COMPILE)as
144
145# Always use GNU ld
146LD	= $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
147		then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
148
149CC	= $(CROSS_COMPILE)gcc
150CPP	= $(CC) -E
151AR	= $(CROSS_COMPILE)ar
152NM	= $(CROSS_COMPILE)nm
153LDR	= $(CROSS_COMPILE)ldr
154STRIP	= $(CROSS_COMPILE)strip
155OBJCOPY = $(CROSS_COMPILE)objcopy
156OBJDUMP = $(CROSS_COMPILE)objdump
157RANLIB	= $(CROSS_COMPILE)RANLIB
158DTC	= dtc
159CHECK	= sparse
160
161#########################################################################
162
163# Load generated board configuration
164sinclude $(OBJTREE)/include/autoconf.mk
165sinclude $(OBJTREE)/include/config.mk
166
167# Some architecture config.mk files need to know what CPUDIR is set to,
168# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
169# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
170# CPU-specific code.
171CPUDIR=arch/$(ARCH)/cpu/$(CPU)
172ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
173CPUDIR=arch/$(ARCH)/cpu
174endif
175
176sinclude $(TOPDIR)/arch/$(ARCH)/config.mk	# include architecture dependend rules
177sinclude $(TOPDIR)/$(CPUDIR)/config.mk		# include  CPU	specific rules
178
179ifdef	SOC
180sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
181endif
182ifdef	VENDOR
183BOARDDIR = $(VENDOR)/$(BOARD)
184else
185BOARDDIR = $(BOARD)
186endif
187ifdef	BOARD
188sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk	# include board specific rules
189endif
190
191#########################################################################
192
193# We don't actually use $(ARFLAGS) anywhere anymore, so catch people
194# who are porting old code to latest mainline but not updating $(AR).
195ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
196RELFLAGS= $(PLATFORM_RELFLAGS)
197DBGFLAGS= -g # -DDEBUG
198OPTFLAGS= -Os #-fomit-frame-pointer
199
200OBJCFLAGS += --gap-fill=0xff
201
202gccincdir := $(shell $(CC) -print-file-name=include)
203
204CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)		\
205	-D__KERNEL__
206
207# Enable garbage collection of un-used sections for SPL
208ifeq ($(CONFIG_SPL_BUILD),y)
209CPPFLAGS += -ffunction-sections -fdata-sections
210LDFLAGS_FINAL += --gc-sections
211endif
212
213# TODO(sjg@chromium.org): Is this correct on Mac OS?
214ifdef CONFIG_FIT_SIGNATURE
215HOSTLIBS	+= -lssl -lcrypto
216endif
217
218ifneq ($(CONFIG_SYS_TEXT_BASE),)
219CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
220endif
221
222ifneq ($(CONFIG_SPL_TEXT_BASE),)
223CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE)
224endif
225
226ifneq ($(CONFIG_SPL_PAD_TO),)
227CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
228endif
229
230ifneq ($(CONFIG_UBOOT_PAD_TO),)
231CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO)
232endif
233
234ifeq ($(CONFIG_SPL_BUILD),y)
235CPPFLAGS += -DCONFIG_SPL_BUILD
236endif
237
238# Does this architecture support generic board init?
239ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
240ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
241CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
242Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
243endif
244endif
245
246ifneq ($(RESET_VECTOR_ADDRESS),)
247CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
248endif
249
250ifneq ($(OBJTREE),$(SRCTREE))
251CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
252endif
253
254CPPFLAGS += -I$(TOPDIR)/include
255CPPFLAGS += -fno-builtin -ffreestanding -nostdinc	\
256	-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
257
258CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
259
260ifdef BUILD_TAG
261CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
262endif
263
264CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
265CFLAGS += $(CFLAGS_SSP)
266# Some toolchains enable security related warning flags by default,
267# but they don't make much sense in the u-boot world, so disable them.
268CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
269	       $(call cc-option,-Wno-format-security)
270CFLAGS += $(CFLAGS_WARN)
271
272# Report stack usage if supported
273CFLAGS_STACK := $(call cc-option,-fstack-usage)
274CFLAGS += $(CFLAGS_STACK)
275
276BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
277
278ifeq ($(findstring examples/,$(BCURDIR)),)
279ifeq ($(CONFIG_SPL_BUILD),)
280ifdef FTRACE
281CFLAGS += -finstrument-functions -DFTRACE
282endif
283endif
284endif
285
286# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
287# option to the assembler.
288AFLAGS_DEBUG :=
289
290# turn jbsr into jsr for m68k
291ifeq ($(ARCH),m68k)
292ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
293AFLAGS_DEBUG := -Wa,-gstabs,-S
294endif
295endif
296
297AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
298
299LDFLAGS += $(PLATFORM_LDFLAGS)
300LDFLAGS_FINAL += -Bstatic
301
302LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
303ifneq ($(CONFIG_SYS_TEXT_BASE),)
304LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
305endif
306
307LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
308ifneq ($(CONFIG_SPL_TEXT_BASE),)
309LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
310endif
311
312# Linus' kernel sanity checking tool
313CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
314                  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
315
316# Location of a usable BFD library, where we define "usable" as
317# "built for ${HOST}, supports ${TARGET}".  Sensible values are
318# - When cross-compiling: the root of the cross-environment
319# - Linux/ppc (native): /usr
320# - NetBSD/ppc (native): you lose ... (must extract these from the
321#   binutils build directory, plus the native and U-Boot include
322#   files don't like each other)
323#
324# So far, this is used only by tools/gdb/Makefile.
325
326ifeq ($(HOSTOS),darwin)
327BFD_ROOT_DIR =		/usr/local/tools
328else
329ifeq ($(HOSTARCH),$(ARCH))
330# native
331BFD_ROOT_DIR =		/usr
332else
333#BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
334#BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
335BFD_ROOT_DIR =		/opt/powerpc
336endif
337endif
338
339#########################################################################
340
341export	HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
342	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
343export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
344
345#########################################################################
346
347# Allow boards to use custom optimize flags on a per dir/file basis
348ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
349ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
350EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
351ALL_CFLAGS += $(EXTRA_CPPFLAGS)
352
353# The _DEP version uses the $< file target (for dependency generation)
354# See rules.mk
355EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
356		$(CPPFLAGS_$(BCURDIR))
357$(obj)%.s:	%.S
358	$(CPP) $(ALL_AFLAGS) -o $@ $<
359$(obj)%.o:	%.S
360	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
361$(obj)%.o:	%.c
362ifneq ($(CHECKSRC),0)
363	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
364endif
365	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
366$(obj)%.i:	%.c
367	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
368$(obj)%.s:	%.c
369	$(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
370
371#########################################################################
372
373# If the list of objects to link is empty, just create an empty built-in.o
374cmd_link_o_target = $(if $(strip $1),\
375		      $(LD) $(LDFLAGS) -r -o $@ $1,\
376		      rm -f $@; $(AR) rcs $@ )
377
378#########################################################################
379