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build/core/combo/TARGET_linux-arm.mk
Shinichiro Hamaji 0e7587a9ea Use .KATI_RESTAT to reduce unnecessary rebuilds of binaries 
When a shared object is rebuilt, all dependent libraries and
executables are rebuilt. Such rebuild is unnecessary when there
is no interface change. With this patch, .toc files will be
generated for all .so files. The rule which generates .toc files
has ninja's restat=1 and .toc files are not changed ninja won't
rebuild dependent targets.

Performance:

$ m && touch bionic/libc/stdio/stdio.c && time m
Before: 1m03s (2563 targets)
After: 21s (90 targets)

Bug: 24597504
Change-Id: Ia5dd950273d143f4e99eee8bef7478f1a94cd138
2015-11-04 15:23:59 +09:00

195 lines
8.2 KiB
Makefile
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#
# 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
# $(BUILD_COMBOS)/arch/<name>.mk which must contain
# makefile variable definitions. Their
# purpose is to allow module Android.mk files to selectively compile
# different versions of code based upon the funtionality and
# instructions available in a given architecture version.
#
# The blocks also define specific arch_variant_cflags, which
# include defines, and compiler settings for the given architecture
# version.
#
ifeq ($(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
$(combo_2nd_arch_prefix)TARGET_CXX := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)g++
$(combo_2nd_arch_prefix)TARGET_AR := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ar
$(combo_2nd_arch_prefix)TARGET_OBJCOPY := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)objcopy
$(combo_2nd_arch_prefix)TARGET_LD := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)ld
$(combo_2nd_arch_prefix)TARGET_READELF := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)readelf
$(combo_2nd_arch_prefix)TARGET_STRIP := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)strip
$(combo_2nd_arch_prefix)TARGET_NM := $($(combo_2nd_arch_prefix)TARGET_TOOLS_PREFIX)nm
define $(combo_var_prefix)transform-shared-lib-to-toc
$(call _gen_toc_command_for_elf,$(1),$(2))
endef
$(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
$(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 \
$(arch_variant_cflags) \
# The "-Wunused-but-set-variable" option often breaks projects that enable
# "-Wall -Werror" due to a commom idiom "ALOGV(mesg)" where ALOGV is turned
# into no-op in some builds while mesg is defined earlier. So we explicitly
# disable "-Wunused-but-set-variable" here.
ifneq ($(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_COMMON += $(libc_root)/kernel/common
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_PACK_MODULE_RELOCATIONS := true
$(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker
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