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 # $(BUILD_COMBOS)/arch/<name>.mk which must contain 23 # makefile variable definitions similar to the preprocessor 24 # defines in build/core/combo/include/arch/<combo>/AndroidConfig.h. Their 25 # purpose is to allow module Android.mk files to selectively compile 26 # different versions of code based upon the funtionality and 27 # instructions available in a given architecture version. 28 # 29 # The blocks also define specific arch_variant_cflags, which 30 # include defines, and compiler settings for the given architecture 31 # version. 32 # 33 ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),) 34 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te 35 endif 36 37 # Decouple NDK library selection with platform compiler version 38 $(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9 39 40 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),) 41 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9 42 else 43 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP) 44 endif 45 46 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk 47 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),) 48 $(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)) 49 endif 50 51 include $(TARGET_ARCH_SPECIFIC_MAKEFILE) 52 include $(BUILD_SYSTEM)/combo/fdo.mk 53 54 # You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else 55 ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)),) 56 $(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION) 57 $(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX := $($(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi- 58 endif 59 60 $(combo_2nd_arch_prefix)TARGET_CC := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)gcc$(HOST_EXECUTABLE_SUFFIX) 61 $(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++$(HOST_EXECUTABLE_SUFFIX) 62 $(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar$(HOST_EXECUTABLE_SUFFIX) 63 $(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy$(HOST_EXECUTABLE_SUFFIX) 64 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld$(HOST_EXECUTABLE_SUFFIX) 65 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf$(HOST_EXECUTABLE_SUFFIX) 66 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip$(HOST_EXECUTABLE_SUFFIX) 67 68 $(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined 69 70 $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS := -O2 \ 71 -fomit-frame-pointer \ 72 -fstrict-aliasing \ 73 -funswitch-loops 74 75 # Modules can choose to compile some source as thumb. 76 $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS := -mthumb \ 77 -Os \ 78 -fomit-frame-pointer \ 79 -fno-strict-aliasing 80 81 # Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk 82 # or in your environment to force a full arm build, even for 83 # files that are normally built as thumb; this can make 84 # gdb debugging easier. Don't forget to do a clean build. 85 # 86 # NOTE: if you try to build a -O0 build with thumb, several 87 # of the libraries (libpv, libwebcore, libkjs) need to be built 88 # with -mlong-calls. When built at -O0, those libraries are 89 # too big for a thumb "BL <label>" to go from one end to the other. 90 ifeq ($(FORCE_ARM_DEBUGGING),true) 91 $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing 92 $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer 93 endif 94 95 android_config_h := $(call select-android-config-h,linux-arm) 96 97 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \ 98 -msoft-float \ 99 -ffunction-sections \ 100 -fdata-sections \ 101 -funwind-tables \ 102 -fstack-protector \ 103 -Wa,--noexecstack \ 104 -Werror=format-security \ 105 -D_FORTIFY_SOURCE=2 \ 106 -fno-short-enums \ 107 -no-canonical-prefixes \ 108 -fno-canonical-system-headers \ 109 $(arch_variant_cflags) \ 110 -include $(android_config_h) \ 111 -I $(dir $(android_config_h)) 112 113 # The "-Wunused-but-set-variable" option often breaks projects that enable 114 # "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned 115 # into no-op in some builds while mesg is defined earlier. So we explicitly 116 # disable "-Wunused-but-set-variable" here. 117 ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8 4.9, $($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)),) 118 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -fno-builtin-sin \ 119 -fno-strict-volatile-bitfields 120 endif 121 122 # This is to avoid the dreaded warning compiler message: 123 # note: the mangling of 'va_list' has changed in GCC 4.4 124 # 125 # The fact that the mangling changed does not affect the NDK ABI 126 # very fortunately (since none of the exposed APIs used va_list 127 # in their exported C++ functions). Also, GCC 4.5 has already 128 # removed the warning from the compiler. 129 # 130 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-psabi 131 132 $(combo_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS += \ 133 -Wl,-z,noexecstack \ 134 -Wl,-z,relro \ 135 -Wl,-z,now \ 136 -Wl,--build-id=md5 \ 137 -Wl,--warn-shared-textrel \ 138 -Wl,--fatal-warnings \ 139 -Wl,--icf=safe \ 140 -Wl,--hash-style=gnu \ 141 $(arch_variant_ldflags) 142 143 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -mthumb-interwork 144 145 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden 146 147 # More flags/options can be added here 148 $(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \ 149 -DNDEBUG \ 150 -g \ 151 -Wstrict-aliasing=2 \ 152 -fgcse-after-reload \ 153 -frerun-cse-after-loop \ 154 -frename-registers 155 156 libc_root := bionic/libc 157 libm_root := bionic/libm 158 159 160 ## on some hosts, the target cross-compiler is not available so do not run this command 161 ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),) 162 # We compile with the global cflags to ensure that 163 # any flags which affect libgcc are correctly taken 164 # into account. 165 $(combo_2nd_arch_prefix)TARGET_LIBGCC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 166 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name) 167 $(combo_2nd_arch_prefix)TARGET_LIBATOMIC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 168 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libatomic.a) 169 $(combo_2nd_arch_prefix)TARGET_LIBGCOV := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 170 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libgcov.a) 171 endif 172 173 KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi 174 KERNEL_HEADERS_ARCH := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH) 175 KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH) 176 177 $(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \ 178 $(libc_root)/arch-arm/include \ 179 $(libc_root)/include \ 180 $(KERNEL_HEADERS) \ 181 $(libm_root)/include \ 182 $(libm_root)/include/arm \ 183 184 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o 185 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o 186 $(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o 187 188 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o 189 $(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o 190 191 $(combo_2nd_arch_prefix)TARGET_PACK_MODULE_RELOCATIONS := true 192 193 $(combo_2nd_arch_prefix)TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libm 194 195 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker 196
