core/combo/TARGET_linux-arm.mk - platform/build - Git at Google

 #
 # Copyright (C) 2006 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #

 # Configuration for Linux on ARM.
 # Included by combo/select.mk

 # You can set TARGET_ARCH_VARIANT to use an arch version other
 # than ARMv5TE. Each value should correspond to a file named
 # $(BUILD_COMBOS)/arch/<name>.mk which must contain
 # makefile variable definitions similar to the preprocessor
 # defines in build/core/combo/include/arch/<combo>/AndroidConfig.h. Their
 # purpose is to allow module Android.mk files to selectively compile
 # different versions of code based upon the funtionality and
 # instructions available in a given architecture version.
 #
 # The blocks also define specific arch_variant_cflags, which
 # include defines, and compiler settings for the given architecture
 # version.
 #
 ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
 endif

 # Decouple NDK library selection with platform compiler version
 $(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9

 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9
 else
 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
 endif

 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
 $(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
 endif

 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk

 # You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
 ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)),)
 $(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
 $(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX := $($(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi-
 endif

 $(combo_2nd_arch_prefix)TARGET_CC := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)

 $(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined

 $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS :=    -O2 \
                         -fomit-frame-pointer \
                         -fstrict-aliasing    \
                         -funswitch-loops

 # Modules can choose to compile some source as thumb.
 $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS :=  -mthumb \
                         -Os \
                         -fomit-frame-pointer \
                         -fno-strict-aliasing

 # Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
 # or in your environment to force a full arm build, even for
 # files that are normally built as thumb; this can make
 # gdb debugging easier.  Don't forget to do a clean build.
 #
 # NOTE: if you try to build a -O0 build with thumb, several
 # of the libraries (libpv, libwebcore, libkjs) need to be built
 # with -mlong-calls.  When built at -O0, those libraries are
 # too big for a thumb "BL <label>" to go from one end to the other.
 ifeq ($(FORCE_ARM_DEBUGGING),true)
   $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
   $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
 endif

 android_config_h := $(call select-android-config-h,linux-arm)

 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \
 			-msoft-float \
 			-ffunction-sections \
 			-fdata-sections \
 			-funwind-tables \
 			-fstack-protector \
 			-Wa,--noexecstack \
 			-Werror=format-security \
 			-D_FORTIFY_SOURCE=2 \
 			-fno-short-enums \
 			-no-canonical-prefixes \
 			-fno-canonical-system-headers \
 			$(arch_variant_cflags) \
 			-include $(android_config_h) \
 			-I $(dir $(android_config_h))

 # The "-Wunused-but-set-variable" option often breaks projects that enable
 # "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned
 # into no-op in some builds while mesg is defined earlier. So we explicitly
 # disable "-Wunused-but-set-variable" here.
 ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8 4.9, $($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)),)
 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -fno-builtin-sin \
 			-fno-strict-volatile-bitfields
 endif

 # This is to avoid the dreaded warning compiler message:
 #   note: the mangling of 'va_list' has changed in GCC 4.4
 #
 # The fact that the mangling changed does not affect the NDK ABI
 # very fortunately (since none of the exposed APIs used va_list
 # in their exported C++ functions). Also, GCC 4.5 has already
 # removed the warning from the compiler.
 #
 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-psabi

 $(combo_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS += \
 			-Wl,-z,noexecstack \
 			-Wl,-z,relro \
 			-Wl,-z,now \
 			-Wl,--build-id=md5 \
 			-Wl,--warn-shared-textrel \
 			-Wl,--fatal-warnings \
 			-Wl,--icf=safe \
 			-Wl,--hash-style=gnu \
 			$(arch_variant_ldflags)

 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -mthumb-interwork

 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden

 # More flags/options can be added here
 $(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \
 			-DNDEBUG \
 			-g \
 			-Wstrict-aliasing=2 \
 			-fgcse-after-reload \
 			-frerun-cse-after-loop \
 			-frename-registers

 libc_root := bionic/libc
 libm_root := bionic/libm


 ## on some hosts, the target cross-compiler is not available so do not run this command
 ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),)
 # We compile with the global cflags to ensure that
 # any flags which affect libgcc are correctly taken
 # into account.
 $(combo_2nd_arch_prefix)TARGET_LIBGCC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
         $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name)
 $(combo_2nd_arch_prefix)TARGET_LIBATOMIC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
         $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libatomic.a)
 $(combo_2nd_arch_prefix)TARGET_LIBGCOV := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
         $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libgcov.a)
 endif

 KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
 KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH)
 KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)

 $(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
 	$(libc_root)/arch-arm/include \
 	$(libc_root)/include \
 	$(KERNEL_HEADERS) \
 	$(libm_root)/include \
 	$(libm_root)/include/arm \

 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
 $(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o

 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
 $(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o

 $(combo_2nd_arch_prefix)TARGET_STRIP_MODULE:=true

 $(combo_2nd_arch_prefix)TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libm

 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker
	#
	# Copyright (C) 2006 The Android Open Source Project
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	#

	# Configuration for Linux on ARM.
	# Included by combo/select.mk

	# You can set TARGET_ARCH_VARIANT to use an arch version other
	# than ARMv5TE. Each value should correspond to a file named
	# $(BUILD_COMBOS)/arch/<name>.mk which must contain
	# makefile variable definitions similar to the preprocessor
	# defines in build/core/combo/include/arch/<combo>/AndroidConfig.h. Their
	# purpose is to allow module Android.mk files to selectively compile
	# different versions of code based upon the funtionality and
	# instructions available in a given architecture version.
	#
	# The blocks also define specific arch_variant_cflags, which
	# include defines, and compiler settings for the given architecture
	# version.
	#
	ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
	TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
	endif

	# Decouple NDK library selection with platform compiler version
	$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9

	ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
	$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9
	else
	$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP)
	endif

	TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk
	ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
	$(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
	endif

	include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
	include $(BUILD_SYSTEM)/combo/fdo.mk

	# You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
	ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)),)
	$(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
	$(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX := $($(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi-
	endif

	$(combo_2nd_arch_prefix)TARGET_CC := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX)
	$(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX)

	$(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined

	$(combo_2nd_arch_prefix)TARGET_arm_CFLAGS := -O2 \
	-fomit-frame-pointer \
	-fstrict-aliasing \
	-funswitch-loops

	# Modules can choose to compile some source as thumb.
	$(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS := -mthumb \
	-Os \
	-fomit-frame-pointer \
	-fno-strict-aliasing

	# Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
	# or in your environment to force a full arm build, even for
	# files that are normally built as thumb; this can make
	# gdb debugging easier. Don't forget to do a clean build.
	#
	# NOTE: if you try to build a -O0 build with thumb, several
	# of the libraries (libpv, libwebcore, libkjs) need to be built
	# with -mlong-calls. When built at -O0, those libraries are
	# too big for a thumb "BL <label>" to go from one end to the other.
	ifeq ($(FORCE_ARM_DEBUGGING),true)
	$(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
	$(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
	endif

	android_config_h := $(call select-android-config-h,linux-arm)

	$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \
	-msoft-float \
	-ffunction-sections \
	-fdata-sections \
	-funwind-tables \
	-fstack-protector \
	-Wa,--noexecstack \
	-Werror=format-security \
	-D_FORTIFY_SOURCE=2 \
	-fno-short-enums \
	-no-canonical-prefixes \
	-fno-canonical-system-headers \
	$(arch_variant_cflags) \
	-include $(android_config_h) \
	-I $(dir $(android_config_h))

	# The "-Wunused-but-set-variable" option often breaks projects that enable
	# "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned
	# into no-op in some builds while mesg is defined earlier. So we explicitly
	# disable "-Wunused-but-set-variable" here.
	ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8 4.9, $($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)),)
	$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -fno-builtin-sin \
	-fno-strict-volatile-bitfields
	endif

	# This is to avoid the dreaded warning compiler message:
	# note: the mangling of 'va_list' has changed in GCC 4.4
	#
	# The fact that the mangling changed does not affect the NDK ABI
	# very fortunately (since none of the exposed APIs used va_list
	# in their exported C++ functions). Also, GCC 4.5 has already
	# removed the warning from the compiler.
	#
	$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-psabi

	$(combo_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS += \
	-Wl,-z,noexecstack \
	-Wl,-z,relro \
	-Wl,-z,now \
	-Wl,--build-id=md5 \
	-Wl,--warn-shared-textrel \
	-Wl,--fatal-warnings \
	-Wl,--icf=safe \
	-Wl,--hash-style=gnu \
	$(arch_variant_ldflags)

	$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -mthumb-interwork

	$(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden

	# More flags/options can be added here
	$(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \
	-DNDEBUG \
	-g \
	-Wstrict-aliasing=2 \
	-fgcse-after-reload \
	-frerun-cse-after-loop \
	-frename-registers

	libc_root := bionic/libc
	libm_root := bionic/libm


	## on some hosts, the target cross-compiler is not available so do not run this command
	ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),)
	# We compile with the global cflags to ensure that
	# any flags which affect libgcc are correctly taken
	# into account.
	$(combo_2nd_arch_prefix)TARGET_LIBGCC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
	$($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name)
	$(combo_2nd_arch_prefix)TARGET_LIBATOMIC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
	$($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libatomic.a)
	$(combo_2nd_arch_prefix)TARGET_LIBGCOV := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \
	$($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libgcov.a)
	endif

	KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
	KERNEL_HEADERS_ARCH := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH)
	KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)

	$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
	$(libc_root)/arch-arm/include \
	$(libc_root)/include \
	$(KERNEL_HEADERS) \
	$(libm_root)/include \
	$(libm_root)/include/arm \

	$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
	$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
	$(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o

	$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
	$(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o

	$(combo_2nd_arch_prefix)TARGET_STRIP_MODULE:=true

	$(combo_2nd_arch_prefix)TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libm

	$(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker