bpo-19569: Add a macro to suppress deprecation warnings (GH-9004)

Co-authored-by: Arfrever Frehtes Taifersar Arahesis <[email protected]>
(cherry picked from commit de4304d)

Co-authored-by: Zackery Spytz <[email protected]>

Author: miss-islington

Include/pyport.h

@@ -513,6 +513,26 @@ extern "C" {
 #define Py_DEPRECATED(VERSION_UNUSED)
 #endif
 
+#if defined(__clang__)
+#define _Py_COMP_DIAG_PUSH _Pragma("clang diagnostic push")
+#define _Py_COMP_DIAG_IGNORE_DEPR_DECLS \
+    _Pragma("clang diagnostic ignored \"-Wdeprecated-declarations\"")
+#define _Py_COMP_DIAG_POP _Pragma("clang diagnostic pop")
+#elif defined(__GNUC__) \
+    && ((__GNUC__ >= 5) || (__GNUC__ == 4) && (__GNUC_MINOR__ >= 6))
+#define _Py_COMP_DIAG_PUSH _Pragma("GCC diagnostic push")
+#define _Py_COMP_DIAG_IGNORE_DEPR_DECLS \
+    _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#define _Py_COMP_DIAG_POP _Pragma("GCC diagnostic pop")
+#elif defined(_MSC_VER)
+#define _Py_COMP_DIAG_PUSH __pragma(warning(push))
+#define _Py_COMP_DIAG_IGNORE_DEPR_DECLS __pragma(warning(disable: 4996))
+#define _Py_COMP_DIAG_POP __pragma(warning(pop))
+#else
+#define _Py_COMP_DIAG_PUSH
+#define _Py_COMP_DIAG_IGNORE_DEPR_DECLS
+#define _Py_COMP_DIAG_POP
+#endif
 
 /* _Py_HOT_FUNCTION
  * The hot attribute on a function is used to inform the compiler that the

Misc/NEWS.d/next/Core and Builtins/2018-08-29-15-57-07.bpo-19569.RGu2Kb.rst

@@ -0,0 +1,2 @@
+Add the private macros ``_Py_COMP_DIAG_PUSH``,
+``_Py_COMP_DIAG_IGNORE_DEPR_DECLS``, and ``_Py_COMP_DIAG_POP``.