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1# Configuration for Linux on ARM.
2# Included by combo/select.make
3
4# You can set TARGET_ARCH_VARIANT to use an arch version other
5# than ARMv5TE. Each value should correspond to a file named
6# $(BUILD_COMBOS)/arch/<name>.mk which must contain
7# makefile variable definitions similar to the preprocessor
8# defines in system/core/include/arch/<combo>/AndroidConfig.h. Their
9# purpose is to allow module Android.mk files to selectively compile
10# different versions of code based upon the funtionality and
11# instructions available in a given architecture version.
12#
13# The blocks also define specific arch_variant_cflags, which
14# include defines, and compiler settings for the given architecture
15# version.
16#
17ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
18TARGET_ARCH_VARIANT := armv5te
19endif
20
21# TARGET_ARCH_VARIANT used to be called TARGET_ARCH_VERSION
22# to avoid any weirdness, issue an error message if the latter
23# is defined.
24#
25ifneq ($(strip $(TARGET_ARCH_VERSION)),)
26$(info Definition for TARGET_ARCH_VERSION encountered !)
27$(info This variable has been renamed TARGET_ARCH_VARIANT, please update your build files !!)
28$(error Aborting the build.)
29endif
30
31TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
32ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
33$(error Unknown ARM architecture version: $(TARGET_ARCH_VARIANT))
34endif
35
36include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
37
38# You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
39ifeq ($(strip $($(combo_target)TOOLS_PREFIX)),)
40$(combo_target)TOOLS_PREFIX := \
41	prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-eabi-4.4.0/bin/arm-eabi-
42endif
43
44$(combo_target)CC := $($(combo_target)TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
45$(combo_target)CXX := $($(combo_target)TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
46$(combo_target)AR := $($(combo_target)TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
47$(combo_target)OBJCOPY := $($(combo_target)TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
48$(combo_target)LD := $($(combo_target)TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
49
50$(combo_target)NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
51
52TARGET_arm_CFLAGS :=    -O2 \
53                        -fomit-frame-pointer \
54                        -fstrict-aliasing    \
55                        -funswitch-loops     \
56                        -finline-limit=300
57
58# Modules can choose to compile some source as thumb. As
59# non-thumb enabled targets are supported, this is treated
60# as a 'hint'. If thumb is not enabled, these files are just
61# compiled as ARM.
62ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
63TARGET_thumb_CFLAGS :=  -mthumb \
64                        -Os \
65                        -fomit-frame-pointer \
66                        -fno-strict-aliasing \
67                        -finline-limit=64
68else
69TARGET_thumb_CFLAGS := $(TARGET_arm_CFLAGS)
70endif
71
72# Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
73# or in your environment to force a full arm build, even for
74# files that are normally built as thumb; this can make
75# gdb debugging easier.  Don't forget to do a clean build.
76#
77# NOTE: if you try to build a -O0 build with thumb, several
78# of the libraries (libpv, libwebcore, libkjs) need to be built
79# with -mlong-calls.  When built at -O0, those libraries are
80# too big for a thumb "BL <label>" to go from one end to the other.
81ifeq ($(FORCE_ARM_DEBUGGING),true)
82  TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
83  TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
84endif
85
86android_config_h := $(call select-android-config-h,linux-arm)
87arch_include_dir := $(dir $(android_config_h))
88
89$(combo_target)GLOBAL_CFLAGS += \
90			-msoft-float -fpic \
91			-ffunction-sections \
92			-funwind-tables \
93			-fstack-protector \
94			-fno-short-enums \
95			$(arch_variant_cflags) \
96			-include $(android_config_h) \
97			-I $(arch_include_dir)
98
99$(combo_target)GLOBAL_LDFLAGS += \
100			$(arch_variant_ldflags)
101
102# We only need thumb interworking in cases where thumb support
103# is available in the architecture, and just to be sure, (and
104# since sometimes thumb-interwork appears to be default), we
105# specifically disable when thumb support is unavailable.
106ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
107$(combo_target)GLOBAL_CFLAGS +=	-mthumb-interwork
108else
109$(combo_target)GLOBAL_CFLAGS +=	-mno-thumb-interwork
110endif
111
112$(combo_target)GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden
113
114$(combo_target)RELEASE_CFLAGS := \
115			-DSK_RELEASE -DNDEBUG \
116			-g \
117			-Wstrict-aliasing=2 \
118			-finline-functions \
119			-fno-inline-functions-called-once \
120			-fgcse-after-reload \
121			-frerun-cse-after-loop \
122			-frename-registers
123
124libc_root := bionic/libc
125libm_root := bionic/libm
126libstdc++_root := bionic/libstdc++
127libthread_db_root := bionic/libthread_db
128
129
130## on some hosts, the target cross-compiler is not available so do not run this command
131ifneq ($(wildcard $($(combo_target)CC)),)
132# We compile with the global cflags to ensure that
133# any flags which affect libgcc are correctly taken
134# into account.
135$(combo_target)LIBGCC := $(shell $($(combo_target)CC) $($(combo_target)GLOBAL_CFLAGS) -print-libgcc-file-name)
136endif
137
138# unless CUSTOM_KERNEL_HEADERS is defined, we're going to use
139# symlinks located in out/ to point to the appropriate kernel
140# headers. see 'config/kernel_headers.make' for more details
141#
142ifneq ($(CUSTOM_KERNEL_HEADERS),)
143    KERNEL_HEADERS_COMMON := $(CUSTOM_KERNEL_HEADERS)
144    KERNEL_HEADERS_ARCH   := $(CUSTOM_KERNEL_HEADERS)
145else
146    KERNEL_HEADERS_COMMON := $(libc_root)/kernel/common
147    KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/arch-$(TARGET_ARCH)
148endif
149KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
150
151$(combo_target)C_INCLUDES := \
152	$(libc_root)/arch-arm/include \
153	$(libc_root)/include \
154	$(libstdc++_root)/include \
155	$(KERNEL_HEADERS) \
156	$(libm_root)/include \
157	$(libm_root)/include/arch/arm \
158	$(libthread_db_root)/include
159
160TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_static.o
161TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_dynamic.o
162TARGET_CRTEND_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_android.o
163
164TARGET_STRIP_MODULE:=true
165
166$(combo_target)DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm
167
168$(combo_target)CUSTOM_LD_COMMAND := true
169define transform-o-to-shared-lib-inner
170$(TARGET_CXX) \
171	-nostdlib -Wl,-soname,$(notdir $@) -Wl,-T,$(BUILD_SYSTEM)/armelf.xsc \
172	-Wl,--gc-sections \
173	-Wl,-shared,-Bsymbolic \
174	$(TARGET_GLOBAL_LD_DIRS) \
175	$(PRIVATE_ALL_OBJECTS) \
176	-Wl,--whole-archive \
177	$(call normalize-host-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
178	-Wl,--no-whole-archive \
179	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
180	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
181	-o $@ \
182	$(PRIVATE_LDFLAGS) \
183	$(TARGET_GLOBAL_LDFLAGS) \
184	$(TARGET_LIBGCC)
185endef
186
187define transform-o-to-executable-inner
188$(TARGET_CXX) -nostdlib -Bdynamic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
189	-Wl,-dynamic-linker,/system/bin/linker \
190    -Wl,--gc-sections \
191	-Wl,-z,nocopyreloc \
192	-o $@ \
193	$(TARGET_GLOBAL_LD_DIRS) \
194	-Wl,-rpath-link=$(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
195	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
196	$(TARGET_CRTBEGIN_DYNAMIC_O) \
197	$(PRIVATE_ALL_OBJECTS) \
198	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
199	$(PRIVATE_LDFLAGS) \
200	$(TARGET_GLOBAL_LDFLAGS) \
201	$(TARGET_LIBGCC) \
202	$(TARGET_CRTEND_O)
203endef
204
205define transform-o-to-static-executable-inner
206$(TARGET_CXX) -nostdlib -Bstatic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
207    -Wl,--gc-sections \
208	-o $@ \
209	$(TARGET_GLOBAL_LD_DIRS) \
210	$(TARGET_CRTBEGIN_STATIC_O) \
211	$(PRIVATE_LDFLAGS) \
212	$(TARGET_GLOBAL_LDFLAGS) \
213	$(PRIVATE_ALL_OBJECTS) \
214	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
215	$(TARGET_LIBGCC) \
216	$(TARGET_CRTEND_O)
217endef
218