From 6eba6c092b2507ece525f61b15f6b57dd018a269 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Fri, 11 Dec 2020 10:07:29 +0100
Subject: [PATCH] Suppress -Wunused-function about _import_array when compiling
 tkagg.cpp.

Per
https://numpy.org/doc/1.17/reference/c-api.array.html#c.NO_IMPORT_ARRAY

Other extension modules in Matplotlib already use the same mechanism.
---
 src/_tkagg.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/_tkagg.cpp b/src/_tkagg.cpp
index d74800d5241d..3e5793f03ce8 100644
--- a/src/_tkagg.cpp
+++ b/src/_tkagg.cpp
@@ -33,6 +33,9 @@
 #define dlsym GetProcAddress
 #else
 #include <dlfcn.h>
+// Suppress -Wunused-function on POSIX, but not on Windows where that would
+// lead to PY_ARRAY_UNIQUE_SYMBOL being an unresolved external.
+#define NO_IMPORT_ARRAY
 #endif
 
 // Include our own excerpts from the Tcl / Tk headers