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