Rework Xenia/premake build scripts to use VsDevCmd for VS2017+ instead

of vcvarsall.bat, this removes Windows Universal CRT SDK as a required
dependency.

tools/build/premake

@@ -139,33 +139,40 @@ def import_vs_environment():
   interesting environment variables into os.environ.
 
   Returns:
-    A version such as 2015 or None if no VS is found.
+  A version such as 2015 or None if no installation is found.
   """
   version = 0
+  install_path = None
+  env_tool_args = None
 
-  candidate_path = subprocess.check_output('../../third_party/vswhere/vswhere.exe -all -version "[15,)" -latest -format value -property installationPath', shell=False, universal_newlines=True)
+  vswhere = subprocess.check_output('third_party/vswhere/vswhere.exe -version "[15,)" -latest -format json', shell=False, universal_newlines=True)
-  candidate_path = candidate_path.strip()
+  if vswhere:
+    vswhere = json.loads(vswhere)
+  if vswhere and len(vswhere) > 0:
+    version = int(vswhere[0].get("catalog", {}).get("productLineVersion", 2017))
+    install_path = vswhere[0].get("installationPath", None)
+
+  if version < 2017:
+    if 'VS140COMNTOOLS' in os.environ:
+      version = 2015
+      vcvars_path = os.environ['VS140COMNTOOLS']
+      vcvars_path = os.path.join(tools_path, '..\\..\\vc\\vcvarsall.bat')
+      env_tool_args = [vcvars_path, 'x64', '&&', 'set']
+  else:
+    vsdevcmd_path = os.path.join(install_path, 'Common7\\Tools\\VsDevCmd.bat')
+    env_tool_args = [vsdevcmd_path, '-arch=amd64', '-host_arch=amd64']
 
-  tools_path = ''
-  if candidate_path:
-    tools_path = os.path.join(candidate_path, 'vc\\auxiliary\\build\\vcvarsall.bat')
-    if os.path.isfile(tools_path) and os.access(tools_path, os.X_OK):
-      version = subprocess.check_output('../../third_party/vswhere/vswhere.exe -version "[15,)" -latest -format value -property catalog_productLineVersion', shell=False, universal_newlines=True)
-      version = version.strip()
-      if version:
-        version = int(version)
-      else:
-        version = 2017
-  if version == 0 and 'VS140COMNTOOLS' in os.environ:
-    version = 2015
-    tools_path = os.environ['VS140COMNTOOLS']
-    tools_path = os.path.join(tools_path, '..\\..\\vc\\vcvarsall.bat')
   if version == 0:
     return None
 
-  args = [tools_path, 'x64', '&&', 'set']
+  import_subprocess_environment(env_tool_args)
+  os.environ['VSVERSION'] = str(version)
+  return version
+
+
+def import_subprocess_environment(args):
   popen = subprocess.Popen(
-      args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
+    args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
   variables, _ = popen.communicate()
   envvars_to_save = (
       'devenvdir',
@@ -188,9 +195,6 @@ def import_vs_environment():
         os.environ[var.upper()] = setting
         break
 
-  os.environ['VSVERSION'] = str(version)
-  return version
-
 def git_submodule_update():
   """Runs a full recursive git submodule init and update.
 

xenia-build

@@ -9,6 +9,7 @@ Run with --help or no arguments for possible commands.
 from __future__ import print_function
 
 import argparse
+import json
 import os
 import re
 import shutil
@@ -89,31 +90,38 @@ def import_vs_environment():
     interesting environment variables into os.environ.
 
     Returns:
-      A version such as 2015 or None if no VS is found.
+      A version such as 2015 or None if no installation is found.
     """
     version = 0
+    install_path = None
+    env_tool_args = None
 
-    candidate_path = subprocess.check_output('third_party/vswhere/vswhere.exe -version "[15,)" -latest -format value -property installationPath', shell=False, universal_newlines=True)
+    vswhere = subprocess.check_output('third_party/vswhere/vswhere.exe -version "[15,)" -latest -format json', shell=False, universal_newlines=True)
-    candidate_path = candidate_path.strip()
+    if vswhere:
+        vswhere = json.loads(vswhere)
+    if vswhere and len(vswhere) > 0:
+        version = int(vswhere[0].get("catalog", {}).get("productLineVersion", 2017))
+        install_path = vswhere[0].get("installationPath", None)
+
+    if version < 2017:
+        if 'VS140COMNTOOLS' in os.environ:
+            version = 2015
+            vcvars_path = os.environ['VS140COMNTOOLS']
+            vcvars_path = os.path.join(tools_path, '..\\..\\vc\\vcvarsall.bat')
+            env_tool_args = [vcvars_path, 'x64', '&&', 'set']
+    else:
+        vsdevcmd_path = os.path.join(install_path, 'Common7\\Tools\\VsDevCmd.bat')
+        env_tool_args = [vsdevcmd_path, '-arch=amd64', '-host_arch=amd64']
 
-    tools_path = ''
-    if candidate_path:
-        tools_path = os.path.join(candidate_path, 'vc\\auxiliary\\build\\vcvarsall.bat')
-        if os.path.isfile(tools_path) and os.access(tools_path, os.X_OK):
-            version = subprocess.check_output('third_party/vswhere/vswhere.exe -version "[15,)" -latest -format value -property catalog_productLineVersion', shell=False, universal_newlines=True)
-            version = version.strip()
-            if version:
-                version = int(version)
-            else:
-                version = 2017
-    if version == 0 and 'VS140COMNTOOLS' in os.environ:
-        version = 2015
-        tools_path = os.environ['VS140COMNTOOLS']
-        tools_path = os.path.join(tools_path, '..\\..\\vc\\vcvarsall.bat')
     if version == 0:
         return None
 
-    args = [tools_path, 'x64', '&&', 'set']
+    import_subprocess_environment(env_tool_args)
+    os.environ['VSVERSION'] = str(version)
+    return version
+
+
+def import_subprocess_environment(args):
     popen = subprocess.Popen(
         args, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True)
     variables, _ = popen.communicate()
@@ -138,10 +146,6 @@ def import_vs_environment():
                 os.environ[var.upper()] = setting
                 break
 
-    os.environ['VSVERSION'] = str(version)
-    return version
-
-
 def has_bin(binary):
     """Checks whether the given binary is present.