Make sure GYP supports compiling managed code.

pylib/gyp/msvs_emulation.py

Index: pylib/gyp/msvs_emulation.py
diff --git a/pylib/gyp/msvs_emulation.py b/pylib/gyp/msvs_emulation.py
index c263cfa6d6c77dc670cb85e57c53515dbabe726d..30b4aa45aa1f39d438252e64e5da75e1df58a623 100644
--- a/pylib/gyp/msvs_emulation.py
+++ b/pylib/gyp/msvs_emulation.py
@@ -442,6 +442,9 @@ class MsvsSettings(object):
     cl('FloatingPointModel',
         map={'0': 'precise', '1': 'strict', '2': 'fast'}, prefix='/fp:',
         default='0')
+    cl('CompileAsManaged',
+        map={'false': '', 'true': '/clr', 'Pure': '/clr:pure',
+        'Safe': '/clr:safe', 'OldSyntax': '/clr:oldSyntax'})

[scottmg, 2015/09/04 17:16:41]

VS2015 cl /? lists:

/clr[:option] compile for common language runtime, where option is:
    pure - produce IL-only output file (no native executable code)
    safe - produce IL-only verifiable output file
    initialAppDomain - enable initial AppDomain behavior of Visual C++ 2002
    noAssembly - do not produce an assembly
    nostdlib - ignore the default \clr directory

Maybe we should stick to only (false, true, Pure, Safe)?

     cl('WholeProgramOptimization', map={'true': '/GL'})
     cl('WarningLevel', prefix='/W')
     cl('WarnAsError', map={'true': '/WX'})