MB: Set crosscompilation config for Linux ARM bot.

webrtc/build/mb_config.pyl

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # FOR DETAILS ON THIS FILE SEE THE MAIN COPY IN //tools/mb/mb_config.pyl.
 # This is configuration for standalone WebRTC bots. It is used to keep the bot
@@ skipping 12 matching lines @@
       'iOS32 Debug': 'ios_gyp_debug_bot_arm_device',
       'iOS32 Release': 'ios_gyp_release_bot_arm_device',
       'iOS64 Debug': 'ios_gyp_debug_bot_arm64_device',
       'iOS64 Release': 'ios_gyp_release_bot_arm64_device',
       'iOS32 Debug Simulator': 'ios_gyp_debug_bot_x86',
       'iOS64 Debug Simulator': 'ios_gyp_debug_bot_x64',
       'iOS64 Debug (GN)': 'ios_gn_debug_bot_arm64_device',
       'iOS64 Release (GN)': 'ios_gn_release_bot_arm64_device',
 
       # Linux
-      'Linux32 ARM': 'gyp_release_bot_arm',
+      'Linux32 ARM': 'gyp_crosscompile_release_bot_arm',
       'Linux32 Debug': 'gyp_debug_bot_x86',
       'Linux32 Release': 'gyp_release_bot_x86',
       'Linux64 Debug': 'gyp_debug_bot_x64',
       'Linux64 Release': 'gyp_release_bot_x64',
       'Linux Asan': 'gyp_asan_lsan_clang_release_bot_x64',
       'Linux Memcheck': 'gyp_memcheck_release_bot_x64',
       'Linux MSan': 'gyp_msan_clang_release_bot_x64',
       'Linux Tsan v2': 'gyp_tsan_clang_release_bot_x64',
       'Linux UBSan': 'gyp_ubsan_clang_release_bot_x64',
       'Linux UBSan vptr': 'gyp_ubsan_vptr_clang_release_bot_x64',
@@ skipping 30 matching lines @@
       'ios64_gn_dbg': 'ios_gn_debug_bot_arm64_device',
       'ios64_gn_rel': 'ios_gn_release_bot_arm64_device',
 
       # Linux
       'linux_compile_dbg': 'gyp_debug_bot_x64',
       'linux_compile_rel': 'gyp_release_bot_x64',
       'linux_dbg': 'gyp_debug_bot_x64',
       'linux_rel': 'gyp_release_bot_x64',
       'linux_gn_dbg': 'gn_debug_bot_x64',
       'linux_gn_rel': 'gn_release_bot_x64',
-      'linux_arm': 'gyp_release_bot_arm',
+      'linux_arm': 'gyp_crosscompile_release_bot_arm',
       'linux_asan': 'gyp_asan_lsan_clang_release_bot_x64',
       'linux_memcheck': 'gyp_memcheck_release_bot_x64',
       'linux_msan': 'gyp_msan_clang_release_bot_x64',
       'linux_tsan2': 'gyp_tsan_clang_release_bot_x64',
       'linux_ubsan': 'gyp_ubsan_clang_release_bot_x64',
       'linux_ubsan_vptr': 'gyp_ubsan_vptr_clang_release_bot_x64',
       'linux_baremetal': 'gyp_release_bot_x64',
       'linux_swarming': 'swarming_gyp_debug_bot_x64',
 
       # Android
@@ skipping 41 matching lines @@
       'ios', 'gyp', 'ios_release_bot', 'arm64', 'device'
     ],
     'ios_gyp_debug_bot_x86': [
       'ios', 'gyp', 'ios_debug_bot', 'x86'
     ],
     'ios_gyp_debug_bot_x64': [
       'ios', 'gyp', 'ios_release_bot', 'x64'
     ],
 
     # Linux
-    'gyp_release_bot_arm': [
-      'gyp', 'openh264_release_bot', 'arm'
+    'gyp_crosscompile_release_bot_arm': [
+      'gyp', 'crosscompile', 'openh264_release_bot', 'arm'
     ],
     'gyp_debug_bot_x86': [
       'gyp', 'openh264_debug_bot', 'x86'
     ],
     'gyp_release_bot_x86': [
       'gyp', 'openh264_release_bot', 'x86'
     ],
     'gyp_debug_bot_x64': [
       'gyp', 'openh264_debug_bot', 'x64'
     ],
@@ skipping 91 matching lines @@
     'asan': {
       'gn_args': 'is_asan=true',
       'gyp_defines': 'asan=1',
     },
 
     'clang': {
       'gn_args': 'is_clang=true',
       'gyp_defines': 'clang=1',
     },
 
+    'crosscompile': {
+      # This mixin is only needed on GYP bots that are doing cross-compiles
+      # but are *not* targetting Android or iOS (where
+      # webrtc/build/gyp_webrtc.py will set the crosscompile variable
+      # automatically). It is not need in GN at all.
+      'gyp_crosscompile': True,
+    },
+
     'dcheck_always_on': {
       'gn_args': 'dcheck_always_on=true',
       'gyp_defines': 'dcheck_always_on=1',
     },
 
     'debug': {
       'gn_args': 'is_debug=true',
     },
 
     'debug_bot': {
@@ skipping 114 matching lines @@
       'gn_args': 'target_cpu="x64"',
       'gyp_defines': 'target_arch=x64',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
       'gyp_defines': 'target_arch=ia32',
     },
   },
 }