Fix "undefined reference to '__atomic_is_lock_free'" errors on Linux

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 161 matching lines @@
         'enable_viewport%': '<(enable_viewport)',
         'enable_hidpi%': '<(enable_hidpi)',
         'enable_topchrome_md%': '<(enable_topchrome_md)',
         'enable_wayland_server%': '<(enable_wayland_server)',
         'enable_wifi_display%': '<(enable_wifi_display)',
         'buildtype%': '<(buildtype)',
         'branding%': '<(branding)',
         'branding_path_component%': '<(branding)',
         'host_arch%': '<(host_arch)',
         'target_arch%': '<(target_arch)',
+        'use_sysroot%': '<(use_sysroot)',
 
         # Set to true to instrument the code with function call logger.
         # See src/third_party/cygprofile/cyg-profile.cc for details.
         'order_profiling%': 0,
 
         'target_subarch%': '',
 
         # The channel to build on Android: stable, beta, dev, canary, or
         # default. "default" should be used on non-official builds.
         'android_channel%': 'default',
@@ skipping 176 matching lines @@
       'android_channel%': '<(android_channel)',
       'use_goma%': '<(use_goma)',
       'gomadir%': '<(gomadir)',
       'enable_app_list%': '<(enable_app_list)',
       'use_default_render_theme%': '<(use_default_render_theme)',
       'buildtype%': '<(buildtype)',
       'branding%': '<(branding)',
       'branding_path_component%': '<(branding_path_component)',
       'arm_version%': '<(arm_version)',
       'sysroot%': '<(sysroot)',
+      'use_sysroot%': '<(use_sysroot)',
       'chroot_cmd%': '<(chroot_cmd)',
       'system_libdir%': '<(system_libdir)',
       'order_profiling%': '<(order_profiling)',
 
       # TODO(zforman): Remove as soon as no bots depend on this.
       'dont_embed_build_metadata%': 0,
 
       # Set to 1 to force Visual C++ to use legacy debug information format /Z7.
       # This is useful for parallel compilation tools which can't support /Zi.
       # Only used on Windows.
@@ skipping 785 matching lines @@
     'image_loader_extension%': '<(image_loader_extension)',
     'fastbuild%': '<(fastbuild)',
     'win_z7%': '<(win_z7)',
     'dcheck_always_on%': '<(dcheck_always_on)',
     'tracing_like_official_build%': '<(tracing_like_official_build)',
     'fieldtrial_testing_like_official_build%': '<(fieldtrial_testing_like_official_build)',
     'arm_version%': '<(arm_version)',
     'arm_neon%': '<(arm_neon)',
     'arm_neon_optional%': '<(arm_neon_optional)',
     'sysroot%': '<(sysroot)',
+    'use_sysroot%': '<(use_sysroot)',
     'pkg-config%': '<(pkg-config)',
     'chroot_cmd%': '<(chroot_cmd)',
     'system_libdir%': '<(system_libdir)',
     'component%': '<(component)',
     'win_analyze%': '<(win_analyze)',
     'win_fastlink%': '<(win_fastlink)',
     'enable_resource_whitelist_generation%': '<(enable_resource_whitelist_generation)',
     'use_titlecase_in_grd%': '<(use_titlecase_in_grd)',
     'remoting%': '<(remoting)',
     'enable_one_click_signin%': '<(enable_one_click_signin)',
@@ skipping 5188 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',
   },
 }