xref: /openbmc/u-boot/config.mk (revision 3102274d)
1#
2# (C) Copyright 2000-2013
3# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
5# SPDX-License-Identifier:	GPL-2.0+
6#
7#########################################################################
8
9# Set shell to bash if possible, otherwise fall back to sh
10SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
11	else if [ -x /bin/bash ]; then echo /bin/bash; \
12	else echo sh; fi; fi)
13
14export	SHELL
15
16ifeq ($(CONFIG_TPL_BUILD),y)
17SPL_BIN := u-boot-tpl
18else
19SPL_BIN := u-boot-spl
20endif
21
22ifeq ($(CURDIR),$(SRCTREE))
23dir :=
24else
25dir := $(subst $(SRCTREE)/,,$(CURDIR))
26endif
27
28ifneq ($(OBJTREE),$(SRCTREE))
29# Create object files for SPL in a separate directory
30ifeq ($(CONFIG_SPL_BUILD),y)
31ifeq ($(CONFIG_TPL_BUILD),y)
32obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
33else
34obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
35endif
36else
37obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
38endif
39src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
40
41$(shell mkdir -p $(obj))
42else
43# Create object files for SPL in a separate directory
44ifeq ($(CONFIG_SPL_BUILD),y)
45ifeq ($(CONFIG_TPL_BUILD),y)
46obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
47else
48obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
49
50endif
51$(shell mkdir -p $(obj))
52else
53obj :=
54endif
55src :=
56endif
57
58# clean the slate ...
59PLATFORM_RELFLAGS =
60PLATFORM_CPPFLAGS =
61PLATFORM_LDFLAGS =
62
63#########################################################################
64
65HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
66		  $(HOSTCPPFLAGS)
67HOSTSTRIP	= strip
68
69#
70# Mac OS X / Darwin's C preprocessor is Apple specific.  It
71# generates numerous errors and warnings.  We want to bypass it
72# and use GNU C's cpp.	To do this we pass the -traditional-cpp
73# option to the compiler.  Note that the -traditional-cpp flag
74# DOES NOT have the same semantics as GNU C's flag, all it does
75# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
76#
77# Apple's linker is similar, thanks to the new 2 stage linking
78# multiple symbol definitions are treated as errors, hence the
79# -multiply_defined suppress option to turn off this error.
80#
81
82ifeq ($(HOSTOS),darwin)
83# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
84DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
85DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')
86
87os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
88	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
89
90# Snow Leopards build environment has no longer restrictions as described above
91HOSTCC		 = $(call os_x_before, 10, 5, "cc", "gcc")
92HOSTCFLAGS	+= $(call os_x_before, 10, 4, "-traditional-cpp")
93HOSTLDFLAGS	+= $(call os_x_before, 10, 5, "-multiply_defined suppress")
94else
95HOSTCC		= gcc
96endif
97
98ifeq ($(HOSTOS),cygwin)
99HOSTCFLAGS	+= -ansi
100endif
101
102# We build some files with extra pedantic flags to try to minimize things
103# that won't build on some weird host compiler -- though there are lots of
104# exceptions for files that aren't complaint.
105
106HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
107HOSTCFLAGS	+= -pedantic
108
109#########################################################################
110#
111# Option checker, gcc version (courtesy linux kernel) to ensure
112# only supported compiler options are used
113#
114CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
115CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
116
117-include $(CC_OPTIONS_CACHE_FILE)
118
119cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
120		if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
121		> /dev/null 2>&1; then \
122		echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
123		echo "$(1)"; fi)
124
125ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
126cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
127else
128cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
129		$(if $(call cc-option-sys,$1),$1,$2)))
130endif
131
132# cc-version
133# Usage gcc-ver := $(call cc-version)
134cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
135binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))
136dtc-version = $(shell $(SHELL) $(SRCTREE)/tools/dtc-version.sh $(DTC))
137
138#
139# Include the make variables (CC, etc...)
140#
141AS	= $(CROSS_COMPILE)as
142
143# Always use GNU ld
144LD	= $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
145		then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
146
147CC	= $(CROSS_COMPILE)gcc
148CPP	= $(CC) -E
149AR	= $(CROSS_COMPILE)ar
150NM	= $(CROSS_COMPILE)nm
151LDR	= $(CROSS_COMPILE)ldr
152STRIP	= $(CROSS_COMPILE)strip
153OBJCOPY = $(CROSS_COMPILE)objcopy
154OBJDUMP = $(CROSS_COMPILE)objdump
155RANLIB	= $(CROSS_COMPILE)RANLIB
156DTC	= dtc
157CHECK	= sparse
158
159#########################################################################
160
161# Load generated board configuration
162ifeq ($(CONFIG_TPL_BUILD),y)
163# Include TPL autoconf
164sinclude $(OBJTREE)/include/tpl-autoconf.mk
165else
166ifeq ($(CONFIG_SPL_BUILD),y)
167# Include SPL autoconf
168sinclude $(OBJTREE)/include/spl-autoconf.mk
169else
170# Include normal autoconf
171sinclude $(OBJTREE)/include/autoconf.mk
172endif
173endif
174sinclude $(OBJTREE)/include/config.mk
175
176# Some architecture config.mk files need to know what CPUDIR is set to,
177# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
178# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
179# CPU-specific code.
180CPUDIR=arch/$(ARCH)/cpu/$(CPU)
181ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
182CPUDIR=arch/$(ARCH)/cpu
183endif
184
185sinclude $(TOPDIR)/arch/$(ARCH)/config.mk	# include architecture dependend rules
186sinclude $(TOPDIR)/$(CPUDIR)/config.mk		# include  CPU	specific rules
187
188ifdef	SOC
189sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
190endif
191ifdef	VENDOR
192BOARDDIR = $(VENDOR)/$(BOARD)
193else
194BOARDDIR = $(BOARD)
195endif
196ifdef	BOARD
197sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk	# include board specific rules
198endif
199
200#########################################################################
201
202# We don't actually use $(ARFLAGS) anywhere anymore, so catch people
203# who are porting old code to latest mainline but not updating $(AR).
204ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
205RELFLAGS= $(PLATFORM_RELFLAGS)
206DBGFLAGS= -g # -DDEBUG
207OPTFLAGS= -Os #-fomit-frame-pointer
208
209OBJCFLAGS += --gap-fill=0xff
210
211gccincdir := $(shell $(CC) -print-file-name=include)
212
213CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)		\
214	-D__KERNEL__
215
216# Enable garbage collection of un-used sections for SPL
217ifeq ($(CONFIG_SPL_BUILD),y)
218CPPFLAGS += -ffunction-sections -fdata-sections
219LDFLAGS_FINAL += --gc-sections
220endif
221
222# TODO(sjg@chromium.org): Is this correct on Mac OS?
223
224# MXSImage needs LibSSL
225ifneq ($(CONFIG_MX23)$(CONFIG_MX28),)
226HOSTLIBS	+= -lssl -lcrypto
227# Add CONFIG_MXS into host CFLAGS, so we can check whether or not register
228# the mxsimage support within tools/mxsimage.c .
229HOSTCFLAGS	+= -DCONFIG_MXS
230endif
231
232ifdef CONFIG_FIT_SIGNATURE
233HOSTLIBS	+= -lssl -lcrypto
234
235# This affects include/image.h, but including the board config file
236# is tricky, so manually define this options here.
237HOSTCFLAGS	+= -DCONFIG_FIT_SIGNATURE
238endif
239
240ifneq ($(CONFIG_SYS_TEXT_BASE),)
241CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
242endif
243
244ifeq ($(CONFIG_SPL_BUILD),y)
245CPPFLAGS += -DCONFIG_SPL_BUILD
246ifeq ($(CONFIG_TPL_BUILD),y)
247CPPFLAGS += -DCONFIG_TPL_BUILD
248endif
249endif
250
251# Does this architecture support generic board init?
252ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
253ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
254CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
255Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
256endif
257endif
258
259ifneq ($(OBJTREE),$(SRCTREE))
260CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
261endif
262
263CPPFLAGS += -I$(TOPDIR)/include
264CPPFLAGS += -fno-builtin -ffreestanding -nostdinc	\
265	-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
266
267CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
268
269ifdef BUILD_TAG
270CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
271endif
272
273CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
274CFLAGS += $(CFLAGS_SSP)
275# Some toolchains enable security related warning flags by default,
276# but they don't make much sense in the u-boot world, so disable them.
277CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
278	       $(call cc-option,-Wno-format-security)
279CFLAGS += $(CFLAGS_WARN)
280
281# Report stack usage if supported
282CFLAGS_STACK := $(call cc-option,-fstack-usage)
283CFLAGS += $(CFLAGS_STACK)
284
285BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
286
287ifeq ($(findstring examples/,$(BCURDIR)),)
288ifeq ($(CONFIG_SPL_BUILD),)
289ifdef FTRACE
290CFLAGS += -finstrument-functions -DFTRACE
291endif
292endif
293endif
294
295# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
296# option to the assembler.
297AFLAGS_DEBUG :=
298
299# turn jbsr into jsr for m68k
300ifeq ($(ARCH),m68k)
301ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
302AFLAGS_DEBUG := -Wa,-gstabs,-S
303endif
304endif
305
306AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
307
308LDFLAGS += $(PLATFORM_LDFLAGS)
309LDFLAGS_FINAL += -Bstatic
310
311LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
312ifneq ($(CONFIG_SYS_TEXT_BASE),)
313LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
314endif
315
316LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
317ifneq ($(CONFIG_SPL_TEXT_BASE),)
318LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
319endif
320
321# Linus' kernel sanity checking tool
322CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
323                  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
324
325# Location of a usable BFD library, where we define "usable" as
326# "built for ${HOST}, supports ${TARGET}".  Sensible values are
327# - When cross-compiling: the root of the cross-environment
328# - Linux/ppc (native): /usr
329# - NetBSD/ppc (native): you lose ... (must extract these from the
330#   binutils build directory, plus the native and U-Boot include
331#   files don't like each other)
332#
333# So far, this is used only by tools/gdb/Makefile.
334
335ifeq ($(HOSTOS),darwin)
336BFD_ROOT_DIR =		/usr/local/tools
337else
338ifeq ($(HOSTARCH),$(ARCH))
339# native
340BFD_ROOT_DIR =		/usr
341else
342#BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
343#BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
344BFD_ROOT_DIR =		/opt/powerpc
345endif
346endif
347
348#########################################################################
349
350export	HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
351	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
352export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
353
354#########################################################################
355
356# Allow boards to use custom optimize flags on a per dir/file basis
357ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
358ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
359EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
360ALL_CFLAGS += $(EXTRA_CPPFLAGS)
361
362# The _DEP version uses the $< file target (for dependency generation)
363# See rules.mk
364EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
365		$(CPPFLAGS_$(BCURDIR))
366$(obj)%.s:	%.S
367	$(CPP) $(ALL_AFLAGS) -o $@ $<
368$(obj)%.o:	%.S
369	$(CC)  $(ALL_AFLAGS) -o $@ $< -c
370$(obj)%.o:	%.c
371ifneq ($(CHECKSRC),0)
372	$(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
373endif
374	$(CC)  $(ALL_CFLAGS) -o $@ $< -c
375$(obj)%.i:	%.c
376	$(CPP) $(ALL_CFLAGS) -o $@ $< -c
377$(obj)%.s:	%.c
378	$(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
379
380#########################################################################
381
382# If the list of objects to link is empty, just create an empty built-in.o
383cmd_link_o_target = $(if $(strip $1),\
384		      $(LD) $(LDFLAGS) -r -o $@ $1,\
385		      rm -f $@; $(AR) rcs $@ )
386
387#########################################################################
388