Output a linker map file for official builds

build/toolchain/android/BUILD.gn

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/clang/clang.gni")
 import("//build/config/sysroot.gni")  # Imports android/config.gni.
 import("//build/toolchain/gcc_toolchain.gni")
 
 # The Android GCC toolchains share most of the same parameters, so we have this
 # wrapper around gcc_toolchain to avoid duplication of logic.
 #
 # Parameters:
 #  - toolchain_root
 #      Path to cpu-specific toolchain within the ndk.
 #  - sysroot
 #      Sysroot for this architecture.
 #  - lib_dir
 #      Subdirectory inside of sysroot where libs go.
 #  - binary_prefix
 #      Prefix of compiler executables.
 template("android_gcc_toolchain") {
   gcc_toolchain(target_name) {
     assert(defined(invoker.toolchain_args),
            "toolchain_args must be defined for android_gcc_toolchain()")
     toolchain_args = invoker.toolchain_args
     toolchain_args.current_os = "android"
 
+    # Output linker map files for binary size analysis.
+    enable_linker_map = true
+
     # Make our manually injected libs relative to the build dir.
     _ndk_lib =
         rebase_path(invoker.sysroot + "/" + invoker.lib_dir, root_build_dir)
 
     libs_section_prefix = "$_ndk_lib/crtbegin_dynamic.o"
     libs_section_postfix = "$_ndk_lib/crtend_android.o"
 
     solink_libs_section_prefix = "$_ndk_lib/crtbegin_so.o"
     solink_libs_section_postfix = "$_ndk_lib/crtend_so.o"
 
@@ skipping 95 matching lines @@
 
 android_gcc_toolchains_helper("mips64el") {
   toolchain_root = mips64_android_toolchain_root
   sysroot = "$android_ndk_root/$mips64_android_sysroot_subdir"
   lib_dir = "usr/lib64"
   binary_prefix = "mips64el-linux-android"
   toolchain_args = {
     current_cpu = "mips64el"
   }
 }