SConstruct : Fix building with USD 25.05 on Windows

Author: murraystevenson

SConstruct

@@ -2094,13 +2094,23 @@ else :
 		"work"
 	]
 
+if env["PLATFORM"] == "win32" :
+	pxrVersionHeader = env.FindFile( "pxr/pxr.h", dependencyIncludes )
+	if pxrVersionHeader is not None and "#define PXR_USE_INTERNAL_BOOST_PYTHON\n" in open( str( pxrVersionHeader ) ) :
+		# Windows builds currently require both boost_python and USD's internal library,
+		# ideally we'd only link to one of them...
+		usdLibs.append( "python" )
+
 if usdEnv["USD_LIB_PREFIX"] :
 	usdLibs = [ usdEnv["USD_LIB_PREFIX"] + x for x in usdLibs ]
 
 usdEnvAppends = {
 	"CXXFLAGS" : [
 		"-Wno-deprecated" if env["PLATFORM"] != "win32" else "",
 		"/Zc:inline-" if env["PLATFORM"] == "win32" else "",
+		# This warning is already disabled generally for release builds,
+		# but also requires disabling for debug builds with USD.
+		"/wd4702" if env["PLATFORM"] == "win32" else "",
 		"-DIECoreUSD_EXPORTS",
 		systemIncludeArgument, "$USD_INCLUDE_PATH",
 		systemIncludeArgument, "$PYTHON_INCLUDE_PATH",