Fixed compilation with MSVC.

recipes/boost/recipe.py

@@ -1,6 +1,7 @@
 
 
 import json
+import os
 import re
 import requests
 from SCons.Script import *
@@ -20,11 +21,15 @@ def versions(env: Environment, update: bool = False):
                 continue
             result.append((int(match.groups()[0]), int(match.groups()[1]), int(match.groups()[2])))
         with open(versions_file, 'w') as f:
-            json.dump(versions, f)
+            json.dump(result, f)
         return result
     else:
-        with open(versions_file, 'r') as f:
-            return [tuple(v) for v in json.load(f)]
+        try:
+            with open(versions_file, 'r') as f:
+                return [tuple(v) for v in json.load(f)]
+        except:
+            print('boost_versions.json is empty or broken, redownloading.')
+            return versions(env, update=True)
 
 def dependencies(env: Environment, version) -> 'dict':
     return {}
@@ -50,7 +55,12 @@ def cook(env: Environment, version) -> dict:
             libs.append(fname)
     else:
         for lib in set(env['BOOST_LIBS']):
-            libs.append(env.FindLib(f'boost_{lib}', paths=build_result['LIBPATH']))
+            if os.name == 'posix':
+                libs.append(env.FindLib(f'boost_{lib}', paths=build_result['LIBPATH']))
+            elif os.name == 'nt':
+                libs.append(env.FindLib(f'libboost_{lib}-*', paths=build_result['LIBPATH'], use_glob=True))
+            else:
+                raise Exception('Boost not supported on this platform.')
     return {
         'CPPPATH': build_result['CPPPATH'],
         'LIBS': libs