xref: /openbmc/u-boot/config.mk (revision d4562e09) 
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
26ifneq ($(OBJTREE),$(SRCTREE))
27ifeq ($(CURDIR),$(SRCTREE))
28dir :=
29else
30dir := $(subst $(SRCTREE)/,,$(CURDIR))
31endif
32
33obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
34src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
35
36$(shell mkdir -p $(obj))
37else
38obj :=
39src :=
40endif
41
42# clean the slate ...
43PLATFORM_RELFLAGS =
44PLATFORM_CPPFLAGS =
45PLATFORM_LDFLAGS =
46
47#########################################################################
48
49HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
50		  $(HOSTCPPFLAGS)
51HOSTSTRIP	= strip
52
53#
54# Mac OS X / Darwin's C preprocessor is Apple specific.  It
55# generates numerous errors and warnings.  We want to bypass it
56# and use GNU C's cpp.  To do this we pass the -traditional-cpp
57# option to the compiler.  Note that the -traditional-cpp flag
58# DOES NOT have the same semantics as GNU C's flag, all it does
59# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
60#
61# Apple's linker is similar, thanks to the new 2 stage linking
62# multiple symbol definitions are treated as errors, hence the
63# -multiply_defined suppress option to turn off this error.
64#
65
66ifeq ($(HOSTOS),darwin)
67# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
68DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
69DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')
70
71os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
72	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
73
74# Snow Leopards build environment has no longer restrictions as described above
75HOSTCC		 = $(call os_x_before, 10, 5, "cc", "gcc")
76HOSTCFLAGS	+= $(call os_x_before, 10, 4, "-traditional-cpp")
77HOSTLDFLAGS	+= $(call os_x_before, 10, 5, "-multiply_defined suppress")
78else
79HOSTCC		= gcc
80endif
81
82ifeq ($(HOSTOS),cygwin)
83HOSTCFLAGS	+= -ansi
84endif
85
86# We build some files with extra pedantic flags to try to minimize things
87# that won't build on some weird host compiler -- though there are lots of
88# exceptions for files that aren't complaint.
89
90HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
91HOSTCFLAGS	+= -pedantic
92
93#########################################################################
94#
95# Option checker (courtesy linux kernel) to ensure
96# only supported compiler options are used
97#
98cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
99		> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
100
101#
102# Include the make variables (CC, etc...)
103#
104AS	= $(CROSS_COMPILE)as
105LD	= $(CROSS_COMPILE)ld
106CC	= $(CROSS_COMPILE)gcc
107CPP	= $(CC) -E
108AR	= $(CROSS_COMPILE)ar
109NM	= $(CROSS_COMPILE)nm
110LDR	= $(CROSS_COMPILE)ldr
111STRIP	= $(CROSS_COMPILE)strip
112OBJCOPY = $(CROSS_COMPILE)objcopy
113OBJDUMP = $(CROSS_COMPILE)objdump
114RANLIB	= $(CROSS_COMPILE)RANLIB
115
116#########################################################################
117
118# Load generated board configuration
119sinclude $(OBJTREE)/include/autoconf.mk
120
121# Some architecture config.mk files need to know what CPUDIR is set to,
122# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
123# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
124# CPU-specific code.
125CPUDIR=arch/$(ARCH)/cpu/$(CPU)
126ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
127CPUDIR=arch/$(ARCH)/cpu
128endif
129
130sinclude $(TOPDIR)/arch/$(ARCH)/config.mk	# include architecture dependend rules
131sinclude $(TOPDIR)/$(CPUDIR)/config.mk		# include  CPU	specific rules
132
133ifdef	SOC
134sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
135endif
136ifdef	VENDOR
137BOARDDIR = $(VENDOR)/$(BOARD)
138else
139BOARDDIR = $(BOARD)
140endif
141ifdef	BOARD
142sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk	# include board specific rules
143endif
144
145#########################################################################
146
147ifneq (,$(findstring s,$(MAKEFLAGS)))
148ARFLAGS = cr
149else
150ARFLAGS = crv
151endif
152RELFLAGS= $(PLATFORM_RELFLAGS)
153DBGFLAGS= -g # -DDEBUG
154OPTFLAGS= -Os #-fomit-frame-pointer
155ifndef LDSCRIPT
156#LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
157ifeq ($(CONFIG_NAND_U_BOOT),y)
158LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
159else
160LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
161endif
162endif
163OBJCFLAGS += --gap-fill=0xff
164
165gccincdir := $(shell $(CC) -print-file-name=include)
166
167CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)		\
168	-D__KERNEL__
169ifneq ($(TEXT_BASE),)
170CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
171endif
172
173ifneq ($(RESET_VECTOR_ADDRESS),)
174CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
175endif
176
177ifneq ($(OBJTREE),$(SRCTREE))
178CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
179endif
180
181CPPFLAGS += -I$(TOPDIR)/include
182CPPFLAGS += -fno-builtin -ffreestanding -nostdinc	\
183	-isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
184
185ifdef BUILD_TAG
186CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
187	-DBUILD_TAG='"$(BUILD_TAG)"'
188else
189CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
190endif
191
192CFLAGS += $(call cc-option,-fno-stack-protector)
193
194# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
195# option to the assembler.
196AFLAGS_DEBUG :=
197
198# turn jbsr into jsr for m68k
199ifeq ($(ARCH),m68k)
200ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
201AFLAGS_DEBUG := -Wa,-gstabs,-S
202endif
203endif
204
205AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
206
207LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
208ifneq ($(TEXT_BASE),)
209LDFLAGS += -Ttext $(TEXT_BASE)
210endif
211
212# Location of a usable BFD library, where we define "usable" as
213# "built for ${HOST}, supports ${TARGET}".  Sensible values are
214# - When cross-compiling: the root of the cross-environment
215# - Linux/ppc (native): /usr
216# - NetBSD/ppc (native): you lose ... (must extract these from the
217#   binutils build directory, plus the native and U-Boot include
218#   files don't like each other)
219#
220# So far, this is used only by tools/gdb/Makefile.
221
222ifeq ($(HOSTOS),darwin)
223BFD_ROOT_DIR =		/usr/local/tools
224else
225ifeq ($(HOSTARCH),$(ARCH))
226# native
227BFD_ROOT_DIR =		/usr
228else
229#BFD_ROOT_DIR =		/LinuxPPC/CDK		# Linux/i386
230#BFD_ROOT_DIR =		/usr/pkg/cross		# NetBSD/i386
231BFD_ROOT_DIR =		/opt/powerpc
232endif
233endif
234
235#########################################################################
236
237export	HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
238	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
239export	TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
240
241#########################################################################
242
243# Allow boards to use custom optimize flags on a per dir/file basis
244BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
245$(obj)%.s:	%.S
246	$(CPP) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \
247		-o $@ $<
248$(obj)%.o:	%.S
249	$(CC)  $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \
250		-o $@ $< -c
251$(obj)%.o:	%.c
252	$(CC)  $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
253		-o $@ $< -c
254$(obj)%.i:	%.c
255	$(CPP) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
256		-o $@ $< -c
257$(obj)%.s:	%.c
258	$(CC)  $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
259		-o $@ $< -c -S
260
261#########################################################################
262