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 # $(BUILD_COMBOS)/arch/<name>.mk which must contain 23 # makefile variable definitions. Their 24 # purpose is to allow module Android.mk files to selectively compile 25 # different versions of code based upon the funtionality and 26 # instructions available in a given architecture version. 27 # 28 # The blocks also define specific arch_variant_cflags, which 29 # include defines, and compiler settings for the given architecture 30 # version. 31 # 32 ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),) 33 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te 34 endif 35 36 # Decouple NDK library selection with platform compiler version 37 $(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9 38 39 ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),) 40 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9 41 else 42 $(combo_2nd_arch_prefix)TARGET_GCC_VERSION := $(TARGET_GCC_VERSION_EXP) 43 endif 44 45 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk 46 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),) 47 $(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)) 48 endif 49 50 include $(TARGET_ARCH_SPECIFIC_MAKEFILE) 51 include $(BUILD_SYSTEM)/combo/fdo.mk 52 53 # You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else 54 ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)),) 55 $(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION) 56 $(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX := $($(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/bin/arm-linux-androideabi- 57 endif 58 59 $(combo_2nd_arch_prefix)TARGET_CC := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)gcc 60 $(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++ 61 $(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar 62 $(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy 63 $(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld 64 $(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf 65 $(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip 66 $(combo_2nd_arch_prefix)TARGET_NM := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)nm 67 68 define $(combo_var_prefix)transform-shared-lib-to-toc 69 $(call _gen_toc_command_for_elf,$(1),$(2)) 70 endef 71 72 $(combo_2nd_arch_prefix)TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined 73 74 $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS := -O2 \ 75 -fomit-frame-pointer \ 76 -fstrict-aliasing \ 77 -funswitch-loops 78 79 # Modules can choose to compile some source as thumb. 80 $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS := -mthumb \ 81 -Os \ 82 -fomit-frame-pointer \ 83 -fno-strict-aliasing 84 85 # Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk 86 # or in your environment to force a full arm build, even for 87 # files that are normally built as thumb; this can make 88 # gdb debugging easier. Don't forget to do a clean build. 89 # 90 # NOTE: if you try to build a -O0 build with thumb, several 91 # of the libraries (libpv, libwebcore, libkjs) need to be built 92 # with -mlong-calls. When built at -O0, those libraries are 93 # too big for a thumb "BL <label>" to go from one end to the other. 94 ifeq ($(FORCE_ARM_DEBUGGING),true) 95 $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing 96 $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer 97 endif 98 99 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \ 100 -msoft-float \ 101 -ffunction-sections \ 102 -fdata-sections \ 103 -funwind-tables \ 104 -fstack-protector-strong \ 105 -Wa,--noexecstack \ 106 -Werror=format-security \ 107 -D_FORTIFY_SOURCE=2 \ 108 -fno-short-enums \ 109 -no-canonical-prefixes \ 110 -fno-canonical-system-headers \ 111 $(arch_variant_cflags) \ 112 113 # The "-Wunused-but-set-variable" option often breaks projects that enable 114 # "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned 115 # into no-op in some builds while mesg is defined earlier. So we explicitly 116 # disable "-Wunused-but-set-variable" here. 117 ifneq ($(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 -Wl,--no-undefined-version \ 142 $(arch_variant_ldflags) 143 144 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -mthumb-interwork 145 146 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CPPFLAGS += -fvisibility-inlines-hidden 147 148 # More flags/options can be added here 149 $(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \ 150 -DNDEBUG \ 151 -g \ 152 -Wstrict-aliasing=2 \ 153 -fgcse-after-reload \ 154 -frerun-cse-after-loop \ 155 -frename-registers 156 157 libc_root := bionic/libc 158 libm_root := bionic/libm 159 160 161 ## on some hosts, the target cross-compiler is not available so do not run this command 162 ifneq ($(wildcard $($(combo_2nd_arch_prefix)TARGET_CC)),) 163 # We compile with the global cflags to ensure that 164 # any flags which affect libgcc are correctly taken 165 # into account. 166 $(combo_2nd_arch_prefix)TARGET_LIBGCC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 167 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-libgcc-file-name) 168 $(combo_2nd_arch_prefix)TARGET_LIBATOMIC := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 169 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libatomic.a) 170 $(combo_2nd_arch_prefix)TARGET_LIBGCOV := $(shell $($(combo_2nd_arch_prefix)TARGET_CC) \ 171 $($(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS) -print-file-name=libgcov.a) 172 endif 173 174 KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi 175 KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common 176 KERNEL_HEADERS_ARCH := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH) 177 KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH) 178 179 $(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \ 180 $(libc_root)/arch-arm/include \ 181 $(libc_root)/include \ 182 $(KERNEL_HEADERS) \ 183 $(libm_root)/include \ 184 $(libm_root)/include/arm \ 185 186 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o 187 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o 188 $(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o 189 190 $(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o 191 $(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o 192 193 $(combo_2nd_arch_prefix)TARGET_PACK_MODULE_RELOCATIONS := true 194 195 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker 196
