Visual Studio builds: Allow silencing deprecation warnings

Define XML_IGNORE_DEPRECATION_WARNINGS and the corresponding XML_POP_WARNINGS
for Visual Studio, and consequently define XML_IGNORE_FPTR_CAST_WARNINGS so
that we do not get a compiler warning on Visual Studio by doing a
__pragma(warning(pop)) without a corresponding __pragma(warning(push)).

Also correct the documentation a bit for XML_POP_WARNINGS.

include/libxml/xmlversion.h.in

@@ -499,13 +499,23 @@ XMLPUBFUN void XMLCALL xmlCheckVersion(int version);
  *
  * Macro used to ignore pointer cast warnings that can't be worked around.
  */
-#define XML_IGNORE_FPTR_CAST_WARNINGS
+#if defined (_MSC_VER) && (_MSC_VER >= 1400)
+#  define XML_IGNORE_FPTR_CAST_WARNINGS __pragma(warning(push))
+#else
+#  define XML_IGNORE_FPTR_CAST_WARNINGS
+#endif
 /**
- * LIBXML_POP_WARNINGS:
+ * XML_POP_WARNINGS:
  *
  * Macro used to restore warnings state.
  */
-#define XML_POP_WARNINGS
+#ifndef XML_POP_WARNINGS
+#  if defined (_MSC_VER) && (_MSC_VER >= 1400)
+#    define XML_POP_WARNINGS __pragma(warning(pop))
+#  else
+#    define XML_POP_WARNINGS
+#  endif
+#endif
 #endif /* __GNUC__ */
 
 #ifdef __cplusplus

python/libxml_wrap.h

@@ -68,6 +68,10 @@
 #define XML_IGNORE_DEPRECATION_WARNINGS \
     _Pragma("GCC diagnostic push") \
     _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#elif defined (_MSC_VER) && (_MSC_VER >= 1400)
+#define XML_IGNORE_DEPRECATION_WARNINGS \
+    __pragma(warning(push)) \
+    __pragma(warning(disable : 4996))
 #else
 #define XML_IGNORE_DEPRECATION_WARNINGS
 #endif