TARGET_linux-arm.mk revision 0cafe839e079f71e4799868d03a39ec82aa277a7 
1#
2# Copyright (C) 2006 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15#
16
17# Configuration for Linux on ARM.
18# Included by combo/select.mk
19
20# You can set TARGET_ARCH_VARIANT to use an arch version other
21# than ARMv5TE. Each value should correspond to a file named
22# $(BUILD_COMBOS)/arch/<name>.mk which must contain
23# makefile variable definitions similar to the preprocessor
24# defines in system/core/include/arch/<combo>/AndroidConfig.h. Their
25# purpose is to allow module Android.mk files to selectively compile
26# different versions of code based upon the funtionality and
27# instructions available in a given architecture version.
28#
29# The blocks also define specific arch_variant_cflags, which
30# include defines, and compiler settings for the given architecture
31# version.
32#
33ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
34TARGET_ARCH_VARIANT := armv5te
35endif
36
37TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
38ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
39$(error Unknown ARM architecture version: $(TARGET_ARCH_VARIANT))
40endif
41
42include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
43
44# You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
45ifeq ($(strip $(TARGET_TOOLS_PREFIX)),)
46TARGET_TOOLS_PREFIX := \
47	prebuilt/$(HOST_PREBUILT_TAG)/toolchain/arm-linux-androideabi-4.4.x/bin/arm-linux-androideabi-
48endif
49
50TARGET_CC := $(TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
51TARGET_CXX := $(TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
52TARGET_AR := $(TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
53TARGET_OBJCOPY := $(TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
54TARGET_LD := $(TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
55TARGET_STRIP := $(TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)
56TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-all $< -o $@
57
58TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined
59
60TARGET_arm_CFLAGS :=    -O2 \
61                        -fomit-frame-pointer \
62                        -fstrict-aliasing    \
63                        -funswitch-loops
64
65# Modules can choose to compile some source as thumb. As
66# non-thumb enabled targets are supported, this is treated
67# as a 'hint'. If thumb is not enabled, these files are just
68# compiled as ARM.
69ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
70TARGET_thumb_CFLAGS :=  -mthumb \
71                        -Os \
72                        -fomit-frame-pointer \
73                        -fno-strict-aliasing
74else
75TARGET_thumb_CFLAGS := $(TARGET_arm_CFLAGS)
76endif
77
78# Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
79# or in your environment to force a full arm build, even for
80# files that are normally built as thumb; this can make
81# gdb debugging easier.  Don't forget to do a clean build.
82#
83# NOTE: if you try to build a -O0 build with thumb, several
84# of the libraries (libpv, libwebcore, libkjs) need to be built
85# with -mlong-calls.  When built at -O0, those libraries are
86# too big for a thumb "BL <label>" to go from one end to the other.
87ifeq ($(FORCE_ARM_DEBUGGING),true)
88  TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
89  TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
90endif
91
92android_config_h := $(call select-android-config-h,linux-arm)
93arch_include_dir := $(dir $(android_config_h))
94
95TARGET_GLOBAL_CFLAGS += \
96			-msoft-float -fpic \
97			-ffunction-sections \
98			-fdata-sections \
99			-funwind-tables \
100			-fstack-protector \
101			-Wa,--noexecstack \
102			-Werror=format-security \
103			-fno-short-enums \
104			$(arch_variant_cflags) \
105			-include $(android_config_h) \
106			-I $(arch_include_dir)
107
108# This is to avoid the dreaded warning compiler message:
109#   note: the mangling of 'va_list' has changed in GCC 4.4
110#
111# The fact that the mangling changed does not affect the NDK ABI
112# very fortunately (since none of the exposed APIs used va_list
113# in their exported C++ functions). Also, GCC 4.5 has already
114# removed the warning from the compiler.
115#
116TARGET_GLOBAL_CFLAGS += -Wno-psabi
117
118TARGET_GLOBAL_LDFLAGS += \
119			-Wl,-z,noexecstack \
120			-Wl,--icf=safe \
121			$(arch_variant_ldflags)
122
123# We only need thumb interworking in cases where thumb support
124# is available in the architecture, and just to be sure, (and
125# since sometimes thumb-interwork appears to be default), we
126# specifically disable when thumb support is unavailable.
127ifeq ($(ARCH_ARM_HAVE_THUMB_SUPPORT),true)
128TARGET_GLOBAL_CFLAGS +=	-mthumb-interwork
129else
130TARGET_GLOBAL_CFLAGS +=	-mno-thumb-interwork
131endif
132
133TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden
134
135# More flags/options can be added here
136TARGET_RELEASE_CFLAGS := \
137			-DNDEBUG \
138			-g \
139			-Wstrict-aliasing=2 \
140			-fgcse-after-reload \
141			-frerun-cse-after-loop \
142			-frename-registers
143
144libc_root := bionic/libc
145libm_root := bionic/libm
146libstdc++_root := bionic/libstdc++
147libthread_db_root := bionic/libthread_db
148
149
150## on some hosts, the target cross-compiler is not available so do not run this command
151ifneq ($(wildcard $(TARGET_CC)),)
152# We compile with the global cflags to ensure that
153# any flags which affect libgcc are correctly taken
154# into account.
155TARGET_LIBGCC := $(shell $(TARGET_CC) $(TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name)
156endif
157
158# Define FDO (Feedback Directed Optimization) options.
159
160TARGET_FDO_CFLAGS:=
161TARGET_FDO_LIB:=
162
163target_libgcov := $(shell $(TARGET_CC) $(TARGET_GLOBAL_CFLAGS) \
164        --print-file-name=libgcov.a)
165ifneq ($(strip $(BUILD_FDO_INSTRUMENT)),)
166  # Set BUILD_FDO_INSTRUMENT=true to turn on FDO instrumentation.
167  # The profile will be generated on /data/local/tmp/profile on the device.
168  TARGET_FDO_CFLAGS := -fprofile-generate=/data/local/tmp/profile -DANDROID_FDO
169  TARGET_FDO_LIB := $(target_libgcov)
170else
171  # If BUILD_FDO_INSTRUMENT is turned off, then consider doing the FDO optimizations.
172  # Set TARGET_FDO_PROFILE_PATH to set a custom profile directory for your build.
173  ifeq ($(strip $(TARGET_FDO_PROFILE_PATH)),)
174    TARGET_FDO_PROFILE_PATH := fdo/profiles/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT)
175  else
176    ifeq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
177      $(warning Custom TARGET_FDO_PROFILE_PATH supplied, but directory does not exist. Turn off FDO.)
178    endif
179  endif
180
181  # If the FDO profile directory can't be found, then FDO is off.
182  ifneq ($(strip $(wildcard $(TARGET_FDO_PROFILE_PATH))),)
183    TARGET_FDO_CFLAGS := -fprofile-use=$(TARGET_FDO_PROFILE_PATH) -DANDROID_FDO
184    TARGET_FDO_LIB := $(target_libgcov)
185  endif
186endif
187
188
189# unless CUSTOM_KERNEL_HEADERS is defined, we're going to use
190# symlinks located in out/ to point to the appropriate kernel
191# headers. see 'config/kernel_headers.make' for more details
192#
193ifneq ($(CUSTOM_KERNEL_HEADERS),)
194    KERNEL_HEADERS_COMMON := $(CUSTOM_KERNEL_HEADERS)
195    KERNEL_HEADERS_ARCH   := $(CUSTOM_KERNEL_HEADERS)
196else
197    KERNEL_HEADERS_COMMON := $(libc_root)/kernel/common
198    KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/arch-$(TARGET_ARCH)
199endif
200KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
201
202TARGET_C_INCLUDES := \
203	$(libc_root)/arch-arm/include \
204	$(libc_root)/include \
205	$(libstdc++_root)/include \
206	$(KERNEL_HEADERS) \
207	$(libm_root)/include \
208	$(libm_root)/include/arm \
209	$(libthread_db_root)/include
210
211TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_static.o
212TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_dynamic.o
213TARGET_CRTEND_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_android.o
214
215TARGET_CRTBEGIN_SO_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtbegin_so.o
216TARGET_CRTEND_SO_O := $(TARGET_OUT_STATIC_LIBRARIES)/crtend_so.o
217
218TARGET_STRIP_MODULE:=true
219
220TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm
221
222TARGET_CUSTOM_LD_COMMAND := true
223
224# Enable the Dalvik JIT compiler if not already specified.
225ifeq ($(strip $(WITH_JIT)),)
226    WITH_JIT := true
227endif
228
229define transform-o-to-shared-lib-inner
230$(hide) $(PRIVATE_CXX) \
231	-nostdlib -Wl,-soname,$(notdir $@) -Wl,-T,$(BUILD_SYSTEM)/armelf.xsc \
232	-Wl,--gc-sections \
233	-Wl,-shared,-Bsymbolic \
234	$(PRIVATE_TARGET_GLOBAL_LD_DIRS) \
235	$(PRIVATE_ALL_OBJECTS) \
236	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTBEGIN_SO_O)) \
237	-Wl,--whole-archive \
238	$(call normalize-target-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
239	-Wl,--no-whole-archive \
240	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
241	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
242	-o $@ \
243	$(PRIVATE_TARGET_GLOBAL_LDFLAGS) \
244	$(PRIVATE_LDFLAGS) \
245	$(PRIVATE_TARGET_FDO_LIB) \
246	$(PRIVATE_TARGET_LIBGCC) \
247	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_SO_O))
248endef
249
250define transform-o-to-executable-inner
251$(hide) $(PRIVATE_CXX) -nostdlib -Bdynamic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
252	-Wl,-dynamic-linker,/system/bin/linker \
253    -Wl,--gc-sections \
254	-Wl,-z,nocopyreloc \
255	-o $@ \
256	$(TARGET_GLOBAL_LD_DIRS) \
257	-Wl,-rpath-link=$(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
258	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
259	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_DYNAMIC_O)) \
260	$(PRIVATE_ALL_OBJECTS) \
261	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
262	$(TARGET_GLOBAL_LDFLAGS) \
263	$(PRIVATE_LDFLAGS) \
264	$(TARGET_FDO_LIB) \
265	$(TARGET_LIBGCC) \
266	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
267endef
268
269define transform-o-to-static-executable-inner
270$(hide) $(PRIVATE_CXX) -nostdlib -Bstatic -Wl,-T,$(BUILD_SYSTEM)/armelf.x \
271    -Wl,--gc-sections \
272	-o $@ \
273	$(TARGET_GLOBAL_LD_DIRS) \
274	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_STATIC_O)) \
275	$(TARGET_GLOBAL_LDFLAGS) \
276	$(PRIVATE_LDFLAGS) \
277	$(PRIVATE_ALL_OBJECTS) \
278	$(call normalize-target-libraries,$(filter-out %libc_nomalloc.a,$(filter-out %libc.a,$(PRIVATE_ALL_STATIC_LIBRARIES)))) \
279	-Wl,--start-group \
280	$(call normalize-target-libraries,$(filter %libc.a,$(PRIVATE_ALL_STATIC_LIBRARIES))) \
281	$(call normalize-target-libraries,$(filter %libc_nomalloc.a,$(PRIVATE_ALL_STATIC_LIBRARIES))) \
282	$(TARGET_FDO_LIB) \
283	$(TARGET_LIBGCC) \
284	-Wl,--end-group \
285	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
286endef
287