GYP changes for arm64 linux build

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 285 matching lines @@
           }],
 
           # The system root for linux builds.
           ['OS=="linux" and chromeos==0 and use_sysroot==1', {
             # sysroot needs to be an absolute path otherwise it generates
             # incorrect results when passed to pkg-config
             'conditions': [
               ['target_arch=="arm"', {
                 'sysroot%': '<!(cd <(DEPTH) && pwd -P)/build/linux/debian_wheezy_arm-sysroot',
               }],
+              ['target_arch=="arm64"', {
+                'sysroot%': '<!(cd <(DEPTH) && pwd -P)/build/linux/debian_jessie_arm64-sysroot',
+              }],
               ['target_arch=="x64"', {
                 'sysroot%': '<!(cd <(DEPTH) && pwd -P)/build/linux/debian_wheezy_amd64-sysroot',
               }],
               ['target_arch=="ia32"', {
                 'sysroot%': '<!(cd <(DEPTH) && pwd -P)/build/linux/debian_wheezy_i386-sysroot',
               }],
               ['target_arch=="mipsel"', {
                 'sysroot%': '<!(cd <(DEPTH) && pwd -P)/build/linux/debian_wheezy_mips-sysroot',
               }],
             ],
@@ skipping 1562 matching lines @@
           }],
           # TODO(dalecurtis): What audio codecs does Chromecast want here?  Sort
           # out and add configs if necessary.  http://crbug.com/570754
           ['OS!="android"', {
             'ffmpeg_branding%': 'ChromeOS',
           }],
         ],
       }],
       ['OS=="linux"', {
         'clang%': 1,
+        'conditions': [
+          ['target_arch=="arm64"', {
+            # Temporarily disable nacl and tcmalloc on arm64 linux to get
+            # rid of compilation errors.
+            'disable_nacl%': 1,
+            'use_allocator%': 'none',
+          }],
+        ],
       }],  # OS=="mac"
       ['OS=="mac"', {
         'conditions': [
           # All Chrome builds have breakpad symbols, but only process the
           # symbols from official builds.
           ['(branding=="Chrome" and buildtype=="Official")', {
             'mac_strip_release%': 1,
           }],
         ],
       }],  # OS=="mac"
@@ skipping 2203 matching lines @@
           }],
           ['target_arch=="arm64"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'conditions': [
                   ['OS=="android"', {
                     'cflags!': [
                        '-fstack-protector',  # stack protector is always enabled on arm64.
                     ],
                   }],
+                  ['clang==1 and arm_arch!="" and OS!="android"', {
+                    'cflags': [
+                      '-target aarch64-linux-gnu',
+                     ],
+                     'ldflags': [
+                       '-target aarch64-linux-gnu',
+                     ],
+                 }],
                 ],
               }],
             ],
           }],
           ['target_arch=="mipsel"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'conditions': [
                   ['mips_arch_variant=="r6"', {
                     'conditions': [
@@ skipping 2205 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }