core/combo/TARGET_linux-x86.mk

#
# 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 x86 as a target.
# Included by combo/select.mk

# Provide a default variant.
ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
TARGET_ARCH_VARIANT := x86
endif

# You can set TARGET_TOOLS_PREFIX to get gcc from somewhere else
ifeq ($(strip $(TARGET_TOOLS_PREFIX)),)
TARGET_TOOLS_PREFIX := \
	prebuilts/gcc/$(HOST_PREBUILT_TAG)/x86/i686-android-linux-4.4.3/bin/i686-android-linux-
endif

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

ifeq ($(TARGET_BUILD_VARIANT),user)
TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@
else
TARGET_STRIP_COMMAND = $(TARGET_STRIP) --strip-debug $< -o $@ && \
	$(TARGET_OBJCOPY) --add-gnu-debuglink=$< $@
endif

ifneq ($(wildcard $(TARGET_CC)),)
TARGET_LIBGCC := \
	$(shell $(TARGET_CC) -m32 -print-file-name=libgcc.a)
endif

TARGET_NO_UNDEFINED_LDFLAGS := -Wl,--no-undefined

libc_root := bionic/libc
libm_root := bionic/libm
libstdc++_root := bionic/libstdc++
libthread_db_root := bionic/libthread_db

# unless CUSTOM_KERNEL_HEADERS is defined, we're going to use
# symlinks located in out/ to point to the appropriate kernel
# headers. see 'config/kernel_headers.make' for more details
#
ifneq ($(CUSTOM_KERNEL_HEADERS),)
    KERNEL_HEADERS_COMMON := $(CUSTOM_KERNEL_HEADERS)
    KERNEL_HEADERS_ARCH   := $(CUSTOM_KERNEL_HEADERS)
else
    KERNEL_HEADERS_COMMON := $(libc_root)/kernel/common
    KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/arch-$(TARGET_ARCH)
endif
KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)

TARGET_GLOBAL_CFLAGS += \
			-O2 \
			-Ulinux \
			-Wa,--noexecstack \
			-Werror=format-security \
			-Wstrict-aliasing=2 \
			-fPIC \
			-ffunction-sections \
			-finline-functions \
			-finline-limit=300 \
			-fno-inline-functions-called-once \
			-fno-short-enums \
			-fstrict-aliasing \
			-funswitch-loops \
			-funwind-tables \
			-include $(call select-android-config-h,target_linux-x86)

# Needs to be fixed later
#TARGET_GLOBAL_CFLAGS += \
#			-fstack-protector

# Needs to be added for RELEASE
#TARGET_GLOBAL_CFLAGS += \
#			-DNDEBUG

TARGET_GLOBAL_CPPFLAGS += \
			-fno-use-cxa-atexit

ifeq ($(TARGET_ARCH_VARIANT),x86-atom)
    # Basic ATOM flags.
    TARGET_GLOBAL_CFLAGS += -march=atom -mstackrealign -mfpmath=sse

    # There are various levels of ATOM processors out there. Different ones have different
    # capabilities. This first define matches the NDK's minimum ABI requirements.
    # Note: Not all of the flags set here are actually used in Android. They are provided
    # to allow for the addition of corresponding optimizations.
    TARGET_GLOBAL_CFLAGS += -DUSE_MMX -DUSE_SSE -DUSE_SSE2 -DUSE_SSE3

    # If you wish to build a BSP that will only be used on hardware that has additional
    # available instructions, enable them here. By default, this is commented off so that
    # the default images can run on all processors that are NDK ABI compliant.
    # TARGET_GLOBAL_CFLAGS += -DUSE_SSSE3
else
    # Plain 'x86' - lowest common denominator. This should run pretty much on any hardware.
    #
    # Note: The NDK's ABI (see the NDK ABI documentation) requires many of the more recent
    # instruction set additions. You can build an "x86" BSP that will run on very old hardware,
    # but it won't be able to run much of the x86 NDK compliant code.
    TARGET_GLOBAL_CFLAGS += -march=i686
endif

TARGET_GLOBAL_CFLAGS += -mbionic
TARGET_GLOBAL_CFLAGS += -D__ANDROID__

TARGET_GLOBAL_LDFLAGS += -m32
TARGET_GLOBAL_LDFLAGS += -Wl,-z,noexecstack
TARGET_GLOBAL_LDFLAGS += -Wl,--gc-sections

TARGET_C_INCLUDES := \
	$(libc_root)/arch-x86/include \
	$(libc_root)/include \
	$(libstdc++_root)/include \
	$(KERNEL_HEADERS) \
	$(libm_root)/include \
	$(libm_root)/include/i387 \
	$(libthread_db_root)/include

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

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

TARGET_STRIP_MODULE:=true

TARGET_DEFAULT_SYSTEM_SHARED_LIBRARIES := libc libstdc++ libm

TARGET_CUSTOM_LD_COMMAND := true
define transform-o-to-shared-lib-inner
$(hide) $(PRIVATE_CXX) \
	$(PRIVATE_TARGET_GLOBAL_LDFLAGS) \
	 -nostdlib -Wl,-soname,$(notdir $@) \
	 -shared -Bsymbolic \
	$(TARGET_GLOBAL_CFLAGS) \
	$(PRIVATE_TARGET_GLOBAL_LD_DIRS) \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTBEGIN_SO_O)) \
	$(PRIVATE_ALL_OBJECTS) \
	-Wl,--whole-archive \
	$(call normalize-target-libraries,$(PRIVATE_ALL_WHOLE_STATIC_LIBRARIES)) \
	-Wl,--no-whole-archive \
	$(if $(PRIVATE_GROUP_STATIC_LIBRARIES),-Wl$(comma)--start-group) \
	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
	$(if $(PRIVATE_GROUP_STATIC_LIBRARIES),-Wl$(comma)--end-group) \
	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
	-o $@ \
	$(PRIVATE_LDFLAGS) \
	$(PRIVATE_TARGET_LIBGCC) \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(PRIVATE_TARGET_CRTEND_SO_O))
endef


define transform-o-to-executable-inner
$(hide) $(PRIVATE_CXX) \
	$(TARGET_GLOBAL_LDFLAGS) \
	-nostdlib -Bdynamic \
	-Wl,-dynamic-linker,/system/bin/linker \
	-Wl,-z,nocopyreloc \
	-o $@ \
	$(TARGET_GLOBAL_LD_DIRS) \
	-Wl,-rpath-link=$(TARGET_OUT_INTERMEDIATE_LIBRARIES) \
	$(call normalize-target-libraries,$(PRIVATE_ALL_SHARED_LIBRARIES)) \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_DYNAMIC_O)) \
	$(PRIVATE_ALL_OBJECTS) \
	$(if $(PRIVATE_GROUP_STATIC_LIBRARIES),-Wl$(comma)--start-group) \
	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
	$(if $(PRIVATE_GROUP_STATIC_LIBRARIES),-Wl$(comma)--end-group) \
	$(PRIVATE_LDFLAGS) \
	$(TARGET_LIBGCC) \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
endef

define transform-o-to-static-executable-inner
$(hide) $(PRIVATE_CXX) \
	$(TARGET_GLOBAL_LDFLAGS) \
	-nostdlib -Bstatic \
	-o $@ \
	$(TARGET_GLOBAL_LD_DIRS) \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTBEGIN_STATIC_O)) \
	$(PRIVATE_LDFLAGS) \
	$(PRIVATE_ALL_OBJECTS) \
	-Wl,--start-group \
	$(call normalize-target-libraries,$(PRIVATE_ALL_STATIC_LIBRARIES)) \
	$(TARGET_LIBGCC) \
	-Wl,--end-group \
	$(if $(filter true,$(PRIVATE_NO_CRT)),,$(TARGET_CRTEND_O))
endef