Add single-toolchain ARM64 build support on Windows

Adds ARM64 targets to generated .sln/.vcxproj files for cross-compiling
node modules to Windows on Arm, 64-bit. To use, run
`set npm_config_arch=arm64` on the command prompt before `npm install`.

Change-Id: Idbe401437e58d13c815c02f7b5b45247daabbe65

gyp/pylib/gyp/MSVSSettings.py

@@ -972,6 +972,7 @@ def _ValidateSettings(validators, settings, stderr):
 _Same(_midl, 'TargetEnvironment',
       _Enumeration(['NotSet',
                     'Win32',  # /env win32
+                    'ARM64',  # /env ARM64
                     'Itanium',  # /env ia64
                     'X64']))  # /env x64
 _Same(_midl, 'EnableErrorChecks',

gyp/pylib/gyp/generator/msvs.py

@@ -1887,6 +1887,8 @@ def _InitNinjaFlavor(params, target_list, target_dicts):
       configuration = '$(Configuration)'
       if params.get('target_arch') == 'x64':
         configuration += '_x64'
+      if params.get('target_arch') == 'arm64':
+        configuration += '_arm64'
       spec['msvs_external_builder_out_dir'] = os.path.join(
           gyp.common.RelativePath(params['options'].toplevel_dir, gyp_dir),
           ninja_generator.ComputeOutputDir(params),

gyp/pylib/gyp/generator/ninja.py

@@ -234,7 +234,7 @@ def __init__(self, hash_for_rules, target_outputs, base_dir, build_dir,
     if flavor == 'win':
       # See docstring of msvs_emulation.GenerateEnvironmentFiles().
       self.win_env = {}
-      for arch in ('x86', 'x64'):
+      for arch in ('x86', 'x64', 'arm64'):
         self.win_env[arch] = 'environment.' + arch
 
     # Relative path from build output dir to base dir.

gyp/pylib/gyp/msvs_emulation.py

@@ -237,7 +237,11 @@ def GetExtension(self):
   def GetVSMacroEnv(self, base_to_build=None, config=None):
     """Get a dict of variables mapping internal VS macro names to their gyp
     equivalents."""
-    target_platform = 'Win32' if self.GetArch(config) == 'x86' else 'x64'
+    target_arch = self.GetArch(config)
+    if target_arch == 'x86':
+      target_platform = 'Win32'
+    else:
+      target_platform = target_arch
     target_name = self.spec.get('product_prefix', '') + \
         self.spec.get('product_name', self.spec['target_name'])
     target_dir = base_to_build + '\\' if base_to_build else ''
@@ -299,7 +303,7 @@ def GetArch(self, config):
     if not platform: # If no specific override, use the configuration's.
       platform = configuration_platform
     # Map from platform to architecture.
-    return {'Win32': 'x86', 'x64': 'x64'}.get(platform, 'x86')
+    return {'Win32': 'x86', 'x64': 'x64', 'ARM64': 'arm64'}.get(platform, 'x86')
 
   def _TargetConfig(self, config):
     """Returns the target-specific configuration."""
@@ -519,7 +523,10 @@ def GetLibFlags(self, config, gyp_to_build_path):
     libflags.extend(self._GetAdditionalLibraryDirectories(
         'VCLibrarianTool', config, gyp_to_build_path))
     lib('LinkTimeCodeGeneration', map={'true': '/LTCG'})
-    lib('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM'},
+    # TODO: These 'map' values come from machineTypeOption enum,
+    # and does not have an official value for ARM64 in VS2017 (yet).
+    # It needs to verify the ARM64 value when machineTypeOption is updated.
+    lib('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM', '18': 'ARM64'},
         prefix='/MACHINE:')
     lib('AdditionalOptions')
     return libflags
@@ -563,7 +570,10 @@ def GetLdflags(self, config, gyp_to_build_path, expand_special,
                           'VCLinkerTool', append=ldflags)
     self._GetDefFileAsLdflags(ldflags, gyp_to_build_path)
     ld('GenerateDebugInformation', map={'true': '/DEBUG'})
-    ld('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM'},
+    # TODO: These 'map' values come from machineTypeOption enum,
+    # and does not have an official value for ARM64 in VS2017 (yet).
+    # It needs to verify the ARM64 value when machineTypeOption is updated.
+    ld('TargetMachine', map={'1': 'X86', '17': 'X64', '3': 'ARM', '18': 'ARM64'},
        prefix='/MACHINE:')
     ldflags.extend(self._GetAdditionalLibraryDirectories(
         'VCLinkerTool', config, gyp_to_build_path))
@@ -860,7 +870,9 @@ def midl(name, default=None):
                  ('iid', iid),
                  ('proxy', proxy)]
     # TODO(scottmg): Are there configuration settings to set these flags?
-    target_platform = 'win32' if self.GetArch(config) == 'x86' else 'x64'
+    target_platform = self.GetArch(config)
+    if target_platform == 'x86':
+      target_platform = 'win32'
     flags = ['/char', 'signed', '/env', target_platform, '/Oicf']
     return outdir, output, variables, flags
 
@@ -1014,7 +1026,7 @@ def GenerateEnvironmentFiles(toplevel_build_dir, generator_flags,
   meet your requirement (e.g. for custom toolchains), you can pass
   "-G ninja_use_custom_environment_files" to the gyp to suppress file
   generation and use custom environment files prepared by yourself."""
-  archs = ('x86', 'x64')
+  archs = ('x86', 'x64', 'arm64')
   if generator_flags.get('ninja_use_custom_environment_files', 0):
     cl_paths = {}
     for arch in archs:

lib/configure.js

@@ -134,6 +134,9 @@ function configure (gyp, argv, callback) {
 
     // set the target_arch variable
     variables.target_arch = gyp.opts.arch || process.arch || 'ia32'
+    if (variables.target_arch == 'arm64') {
+      defaults['msvs_configuration_platform'] = 'ARM64'
+    }
 
     // set the node development directory
     variables.nodedir = nodeDir