From e33914e0c1df4344a7b2f3bd9f56b4a6f43af445 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Verschelde?= <rverschelde@gmail.com>
Date: Thu, 16 Jan 2020 12:07:58 +0100
Subject: [PATCH] MinGW: Avoid GCC -Wcast-function-type warnings on
 GetProcAddress

Using the same method as GNUlib and various other projects.
https://lists.gnu.org/archive/html/bug-gnulib/2018-08/msg00109.html

The warning is valid, but there's no way around it since the issue
comes from the Windows SDK. It's also harmless in this case.

Part of #29801.
---
 platform/windows/context_gl_windows.cpp | 5 +++++
 platform/windows/joypad_windows.cpp     | 5 +++++
 platform/windows/os_windows.cpp         | 5 +++++
 3 files changed, 15 insertions(+)

diff --git a/platform/windows/context_gl_windows.cpp b/platform/windows/context_gl_windows.cpp
index 434d6852501..ad62e3a3067 100644
--- a/platform/windows/context_gl_windows.cpp
+++ b/platform/windows/context_gl_windows.cpp
@@ -43,6 +43,11 @@
 #define WGL_CONTEXT_PROFILE_MASK_ARB 0x9126
 #define WGL_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
 
+#if defined(__GNUC__)
+// Workaround GCC warning from -Wcast-function-type.
+#define wglGetProcAddress (void *)wglGetProcAddress
+#endif
+
 typedef HGLRC(APIENTRY *PFNWGLCREATECONTEXTATTRIBSARBPROC)(HDC, HGLRC, const int *);
 
 void ContextGL_Windows::release_current() {
diff --git a/platform/windows/joypad_windows.cpp b/platform/windows/joypad_windows.cpp
index c82a90bf7d1..49432435b93 100644
--- a/platform/windows/joypad_windows.cpp
+++ b/platform/windows/joypad_windows.cpp
@@ -37,6 +37,11 @@
 #define __builtin_bswap32 _byteswap_ulong
 #endif
 
+#if defined(__GNUC__)
+// Workaround GCC warning from -Wcast-function-type.
+#define GetProcAddress (void *)GetProcAddress
+#endif
+
 DWORD WINAPI _xinput_get_state(DWORD dwUserIndex, XINPUT_STATE *pState) {
 	return ERROR_DEVICE_NOT_CONNECTED;
 }
diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 3868d0bc63f..a6977a7a86d 100755
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -74,6 +74,11 @@ __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
 #define WM_POINTERUPDATE 0x0245
 #endif
 
+#if defined(__GNUC__)
+// Workaround GCC warning from -Wcast-function-type.
+#define GetProcAddress (void *)GetProcAddress
+#endif
+
 typedef struct {
 	int count;
 	int screen;