Let package_from_installed write the build env into json files in addition to SetEnv.cmd

win_toolchain/package_from_installed.py

Index: win_toolchain/package_from_installed.py
diff --git a/win_toolchain/package_from_installed.py b/win_toolchain/package_from_installed.py
index e2785d722003ee44c3bc68f793fbc1bc72a441fe..500e51cc1fd8c0166d0b937416b683868c81a37f 100644
--- a/win_toolchain/package_from_installed.py
+++ b/win_toolchain/package_from_installed.py
@@ -21,7 +21,9 @@ useful as the resulting zip can't be redistributed, and most will presumably
 have a Pro license anyway).
 """
 
+import collections
 import glob
+import json
 import optparse
 import os
 import platform
@@ -214,15 +216,15 @@ def GenerateSetEnvCmd(target_dir):
     ['..', '..', 'VC', 'atlmfc', 'include'],
   ])
   # Common to x86 and x64
-  env = [
+  env = collections.OrderedDict([
     # Yuck: These two have a trailing \ character. No good way to represent this
     # in an OS-independent way.
     ('VSINSTALLDIR', [['..', '..\\']]),
     ('VCINSTALLDIR', [['..', '..', 'VC\\']]),
     ('INCLUDE', include_dirs),
-  ]
+  ])
   # x86. Always use amd64_x86 cross, not x86 on x86.
-  env_x86 = [
+  env_x86 = collections.OrderedDict([
     ('PATH', [
       ['..', '..', 'win_sdk', 'bin', 'x86'],
       ['..', '..', 'VC', 'bin', 'amd64_x86'],
@@ -234,9 +236,9 @@ def GenerateSetEnvCmd(target_dir):
       ['..', '..', 'win_sdk', 'Lib', WIN_VERSION, 'ucrt', 'x86'],  # VS 2015
       ['..', '..', 'VC', 'atlmfc', 'lib'],
     ]),
-  ]
+  ])
   # x64.
-  env_x64 = [
+  env_x64 = collections.OrderedDict([
     ('PATH', [
       ['..', '..', 'win_sdk', 'bin', 'x64'],
       ['..', '..', 'VC', 'bin', 'amd64'],
@@ -247,25 +249,32 @@ def GenerateSetEnvCmd(target_dir):
       ['..', '..', 'win_sdk', 'Lib', WIN_VERSION, 'ucrt', 'x64'],  # VS 2015
       ['..', '..', 'VC', 'atlmfc', 'lib', 'amd64'],
     ]),
-  ]
+  ])
   def BatDirs(dirs):
     return ';'.join(['%~dp0' + os.path.join(*d) for d in dirs])
-  with open(os.path.join(target_dir, r'win_sdk\bin\SetEnv.cmd'), 'w') as f:
+  set_env_prefix = os.path.join(target_dir, r'win_sdk\bin\SetEnv')
+  with open(set_env_prefix + '.cmd', 'w') as f:
     f.write('@echo off\n'
             ':: Generated by win_toolchain\\package_from_installed.py.\n')
-    for var, dirs in env:
+    for var, dirs in env.iteritems():
       f.write('set %s=%s\n' % (var, BatDirs(dirs)))
     f.write('if "%1"=="/x64" goto x64\n')
 
-    for var, dirs in env_x86:
+    for var, dirs in env_x86.iteritems():
       f.write('set %s=%s%s\n' % (
           var, BatDirs(dirs), ';%PATH%' if var == 'PATH' else ''))
     f.write('goto :EOF\n')
 
     f.write(':x64\n')
-    for var, dirs in env_x64:
+    for var, dirs in env_x64.iteritems():
       f.write('set %s=%s%s\n' % (
           var, BatDirs(dirs), ';%PATH%' if var == 'PATH' else ''))
+  with open(set_env_prefix + '.x86.json', 'wb') as f:
+    assert not set(env.keys()) & set(env_x86.keys()), 'dupe keys'
+    json.dump(collections.OrderedDict(env.items() + env_x86.items()), f)
+  with open(set_env_prefix + '.x64.json', 'wb') as f:
+    assert not set(env.keys()) & set(env_x64.keys()), 'dupe keys'
+    json.dump(collections.OrderedDict(env.items() + env_x64.items()), f)
 
 
 def AddEnvSetup(files):