build: support apple silicon (arm64 darwin) builds (#49)

* build: support apple silicon (arm64 darwin) builds

* Update CHANGELOG.md

Author: MarshallOfSound

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 
 - Fixed a bug on Solaris where copying archives failed.
+- Added support for passing arbitrary architectures to Xcode builds, enables `arm64` builds.
 
 ## [0.3.0] - 2020-06-06
 

pylib/gyp/generator/make.py

@@ -1342,7 +1342,7 @@ def WriteSources(
             )
 
             if self.flavor == "mac":
-                cflags = self.xcode_settings.GetCflags(configname)
+                cflags = self.xcode_settings.GetCflags(configname, arch=config.get('xcode_configuration_platform'))
                 cflags_c = self.xcode_settings.GetCflagsC(configname)
                 cflags_cc = self.xcode_settings.GetCflagsCC(configname)
                 cflags_objc = self.xcode_settings.GetCflagsObjC(configname)
@@ -1637,6 +1637,7 @@ def WriteTarget(
                         configname,
                         generator_default_variables["PRODUCT_DIR"],
                         lambda p: Sourceify(self.Absolutify(p)),
+                        arch=config.get('xcode_configuration_platform')
                     )
 
                     # TARGET_POSTBUILDS_$(BUILDTYPE) is added to postbuilds later on.