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# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//build/config/android/rules.gni")
import("//build/config/c++/c++.gni")
import("//build/config/compiler/compiler.gni")
import("//build/config/sanitizers/sanitizers.gni")
if (current_toolchain == default_toolchain) {
import("//build/toolchain/concurrent_links.gni")
}
assert(is_android)
# This is included by reference in the //build/config/compiler config that
# is applied to all targets. It is here to separate out the logic that is
# Android-only.
config("compiler") {
cflags = [
"-ffunction-sections",
"-fno-short-enums",
]
defines = [
"ANDROID",
# The NDK has these things, but doesn't define the constants to say that it
# does. Define them here instead.
"HAVE_SYS_UIO_H",
# Forces full rebuilds on NDK rolls. To rebuild everything when NDK version
# stays the same, increment the suffix number.
"ANDROID_NDK_VERSION_ROLL=${android_ndk_version}_1",
]
if (android_64bit_current_cpu) {
_max_page_size = 16384
} else {
_max_page_size = 4096
}
ldflags = [
# Don't allow visible symbols from libraries that contain
# assembly code with symbols that aren't hidden properly.
# http://crbug.com/448386
"-Wl,--exclude-libs=libvpx_assembly_arm.a",
# Reduce the page size from 65536 in order to reduce binary size slightly
# by shrinking the alignment gap between segments. This also causes all
# segments to be mapped adjacently, which breakpad relies on.
"-Wl,-z,max-page-size=$_max_page_size",
]
if (current_cpu == "arm64") {
if (arm_control_flow_integrity == "standard") {
cflags += [ "-mbranch-protection=standard" ]
rustflags = [ "-Zbranch-protection=bti" ]
} else if (arm_control_flow_integrity == "pac") {
cflags += [ "-mbranch-protection=pac-ret" ]
rustflags = [ "-Zbranch-protection=pac-ret" ]
}
}
# $compile_api_level corresponds to the API level used for the sysroot path
# calculation in //build/config/android/config.gni
if (android_64bit_target_cpu) {
compile_api_level = android64_ndk_api_level
} else {
compile_api_level = android32_ndk_api_level
}
cflags += [ "--target=$android_abi_target$compile_api_level" ]
ldflags += [ "--target=$android_abi_target$compile_api_level" ]
# Assign any flags set for the C compiler to asmflags so that they are sent
# to the assembler.
asmflags = cflags
}
# This is included by reference in the //build/config/compiler:runtime_library
# config that is applied to all targets. It is here to separate out the logic
# that is Android-only. Please see that target for advice on what should go in
# :runtime_library vs. :compiler.
config("runtime_library") {
libs = []
ldflags = []
# On 64-bit platforms, the only symbols provided by libandroid_support.a are
# strto{d,f,l,ul}_l. These symbols are not used by our libc++, and newer NDKs
# don't provide a libandroid_support.a on 64-bit platforms, so we only depend
# on this library on 32-bit platforms.
if (current_cpu == "arm" || current_cpu == "x86") {
libs += [ "android_support" ]
}
if (current_cpu == "arm" && arm_version == 6) {
libs += [ "atomic" ]
}
}
config("hide_all_but_jni_onload") {
ldflags = [ "-Wl,--version-script=" + rebase_path(
"//build/android/android_only_explicit_jni_exports.lst",
root_build_dir) ]
}
config("hide_all_but_jni") {
ldflags = [ "-Wl,--version-script=" +
rebase_path("//build/android/android_only_jni_exports.lst",
root_build_dir) ]
}
config("lld_pack_relocations") {
ldflags = [ "-Wl,--pack-dyn-relocs=android" ]
}
config("lld_relr_relocations") {
# RELR supported API 30+, but supported 28+ with --use-android-relr-tags.
# https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#relative-relocations-relr
ldflags = [ "-Wl,--pack-dyn-relocs=relr,--use-android-relr-tags" ]
}
config("lld_branch_target_hardening") {
# Config opts a shared library into BTI linker hardening. This
# is an opt-in config (rather than default-enabled) to avoid
# interfering with the V8 CFI bots (crbug.com/1334614).
if (current_cpu == "arm64") {
if (arm_control_flow_integrity == "standard") {
# Linking objects without GNU_PROPERTY_AARCH64_FEATURE_1_BTI
# in their .gnu.note section implicitly results in the final
# binary losing Branch Target Identification (BTI) support.
# Issue a warning if this happens.
ldflags = [ "-Wl,-z,force-bti" ]
}
}
}
# Used for instrumented build to generate the orderfile.
config("default_orderfile_instrumentation") {
if (use_order_profiling) {
cflags = [ "-finstrument-function-entry-bare" ]
if (use_thin_lto) {
# TODO(pcc): This should not be necessary. Remove once
# https://reviews.llvm.org/D50016 lands and gets rolled in.
ldflags = [ "-Wl,-u,__cyg_profile_func_enter_bare" ]
}
}
}
if (current_toolchain == default_toolchain) {
# nocompile tests share output directory to avoid them all needing to rebuild
# things. But this also means they can't run in parallel.
pool("nocompile_pool") {
depth = 1
}
# When defined, this pool should be used instead of link_pool for command
# that need 1-2GB of RAM. https://crbug.com/1078460
if (defined(java_cmd_pool_size)) {
pool("java_cmd_pool") {
depth = java_cmd_pool_size
}
}
}
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