Add README to clarify relation to U-Boot and ACube's version
[u-boot-sam460ex.git] / config.mk
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 ifneq ($(OBJTREE),$(SRCTREE))
27 ifeq ($(CURDIR),$(SRCTREE))
28 dir :=
29 else
30 dir := $(subst $(SRCTREE)/,,$(CURDIR))
31 endif
32
33 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
34 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
35
36 $(shell mkdir -p $(obj))
37 else
38 obj :=
39 src :=
40 endif
41
42 # clean the slate ...
43 PLATFORM_RELFLAGS =
44 PLATFORM_CPPFLAGS =
45 PLATFORM_LDFLAGS =
46
47 #########################################################################
48
49 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
50 $(HOSTCPPFLAGS)
51 HOSTSTRIP = strip
52
53 #
54 # Mac OS X / Darwin's C preprocessor is Apple specific. It
55 # generates numerous errors and warnings. We want to bypass it
56 # and use GNU C's cpp. To do this we pass the -traditional-cpp
57 # option to the compiler. Note that the -traditional-cpp flag
58 # DOES NOT have the same semantics as GNU C's flag, all it does
59 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
60 #
61 # Apple's linker is similar, thanks to the new 2 stage linking
62 # multiple symbol definitions are treated as errors, hence the
63 # -multiply_defined suppress option to turn off this error.
64 #
65
66 ifeq ($(HOSTOS),darwin)
67 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
68 DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
69 DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')
70
71 before-snow-leopard = $(shell if [ $(DARWIN_MAJOR_VERSION) -le 10 -a \
72 $(DARWIN_MINOR_VERSION) -le 5 ] ; then echo "$(1)"; else echo "$(2)"; fi ;)
73
74 # Snow Leopards build environment has no longer restrictions as described above
75 HOSTCC = $(call before-snow-leopard, "cc", "gcc")
76 HOSTCFLAGS += $(call before-snow-leopard, "-traditional-cpp")
77 HOSTLDFLAGS += $(call before-snow-leopard, "-multiply_defined suppress")
78 else
79 HOSTCC = gcc
80 endif
81
82 ifeq ($(HOSTOS),cygwin)
83 HOSTCFLAGS += -ansi
84 endif
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
90 HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
91 HOSTCFLAGS += -pedantic
92
93 #########################################################################
94 #
95 # Option checker (courtesy linux kernel) to ensure
96 # only supported compiler options are used
97 #
98 cc-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 #
104 AS = $(CROSS_COMPILE)as
105 LD = $(CROSS_COMPILE)ld
106 CC = $(CROSS_COMPILE)gcc
107 CPP = $(CC) -E
108 AR = $(CROSS_COMPILE)ar
109 NM = $(CROSS_COMPILE)nm
110 LDR = $(CROSS_COMPILE)ldr
111 STRIP = $(CROSS_COMPILE)strip
112 OBJCOPY = $(CROSS_COMPILE)objcopy
113 OBJDUMP = $(CROSS_COMPILE)objdump
114 RANLIB = $(CROSS_COMPILE)RANLIB
115
116 #########################################################################
117
118 # Load generated board configuration
119 sinclude $(OBJTREE)/include/autoconf.mk
120
121 # Some architecture config.mk files need to know what CPUDIR is set to,
122 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
123 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
124 # CPU-specific code.
125 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
126 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
127 CPUDIR=arch/$(ARCH)/cpu
128 endif
129
130 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules
131 sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules
132
133 ifdef SOC
134 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
135 endif
136 ifdef VENDOR
137 BOARDDIR = $(VENDOR)/$(BOARD)
138 else
139 BOARDDIR = $(BOARD)
140 endif
141 ifdef BOARD
142 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
143 endif
144
145 #########################################################################
146
147 ifneq (,$(findstring s,$(MAKEFLAGS)))
148 ARFLAGS = cr
149 else
150 ARFLAGS = crv
151 endif
152 RELFLAGS= $(PLATFORM_RELFLAGS)
153 DBGFLAGS= -g # -DDEBUG
154 OPTFLAGS= -Os #-fomit-frame-pointer
155 ifndef LDSCRIPT
156 #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
157 ifeq ($(CONFIG_NAND_U_BOOT),y)
158 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
159 else
160 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
161 endif
162 endif
163 OBJCFLAGS += --gap-fill=0xff
164
165 gccincdir := $(shell $(CC) -print-file-name=include)
166
167 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
168 -D__KERNEL__
169 ifneq ($(TEXT_BASE),)
170 CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
171 endif
172
173 ifneq ($(RESET_VECTOR_ADDRESS),)
174 CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
175 endif
176
177 ifneq ($(OBJTREE),$(SRCTREE))
178 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
179 endif
180
181 CPPFLAGS += -I$(TOPDIR)/include
182 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \
183 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
184
185 ifdef BUILD_TAG
186 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
187 -DBUILD_TAG='"$(BUILD_TAG)"'
188 else
189 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
190 endif
191
192 CFLAGS += $(call cc-option,-fno-stack-protector)
193
194 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
195 # option to the assembler.
196 AFLAGS_DEBUG :=
197
198 # turn jbsr into jsr for m68k
199 ifeq ($(ARCH),m68k)
200 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
201 AFLAGS_DEBUG := -Wa,-gstabs,-S
202 endif
203 endif
204
205 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
206
207 LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
208 ifneq ($(TEXT_BASE),)
209 LDFLAGS += -Ttext $(TEXT_BASE)
210 endif
211
212 # Location of a usable BFD library, where we define "usable" as
213 # "built for ${HOST}, supports ${TARGET}". Sensible values are
214 # - When cross-compiling: the root of the cross-environment
215 # - Linux/ppc (native): /usr
216 # - NetBSD/ppc (native): you lose ... (must extract these from the
217 # binutils build directory, plus the native and U-Boot include
218 # files don't like each other)
219 #
220 # So far, this is used only by tools/gdb/Makefile.
221
222 ifeq ($(HOSTOS),darwin)
223 BFD_ROOT_DIR = /usr/local/tools
224 else
225 ifeq ($(HOSTARCH),$(ARCH))
226 # native
227 BFD_ROOT_DIR = /usr
228 else
229 #BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386
230 #BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386
231 BFD_ROOT_DIR = /opt/powerpc
232 endif
233 endif
234
235 #########################################################################
236
237 export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
238 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
239 export 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
244 BCURDIR = $(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 #########################################################################