# HG changeset patch
# User adf88@interia.pl
# Date 1500961694 -7200
#      Tue Jul 25 07:48:14 2017 +0200
# Branch trunk
# Node ID c760233b90f1e394a4ef8a9d13b58e5f8eecbda7
# Parent  096954668ebcc43ef2c7ccdfb7c7d42a472df1cc
Fix unresolved 'WinMain' and '_safe_esp' symbols when linking with LTO on MinGW.

diff -r 096954668ebc -r c760233b90f1 src/os/windows/crashlog_win.cpp
--- a/src/os/windows/crashlog_win.cpp	Thu Jul 13 17:45:38 2017 +0000
+++ b/src/os/windows/crashlog_win.cpp	Tue Jul 25 07:48:14 2017 +0200
@@ -487,8 +487,11 @@
 /**
  * Stack pointer for use when 'starting' the crash handler.
  * Not static as gcc's inline assembly needs it that way.
+ *
+ * Mark it as 'used' to prevent optimizing out by LTO.
+ * This was happening e.g. on MinGW-w64 5.0.2 with GCC 7.0.1.
  */
-void *_safe_esp = NULL;
+void *_safe_esp GCC_USED = NULL;
 
 static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
 {
diff -r 096954668ebc -r c760233b90f1 src/os/windows/win32.cpp
--- a/src/os/windows/win32.cpp	Thu Jul 13 17:45:38 2017 +0000
+++ b/src/os/windows/win32.cpp	Tue Jul 25 07:48:14 2017 +0200
@@ -426,10 +426,12 @@
 	}
 }
 
+/* Mark WinMain as "used" to prevent optimizong out by LTO.
+ * This was happening e.g. on MinGW-w64 4.0.6 with GCC 6.2.0. */
 #if defined(WINCE)
-int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
+int GCC_USED APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
 #else
-int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
+int GCC_USED APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
 #endif
 {
 	int argc;
diff -r 096954668ebc -r c760233b90f1 src/stdafx.h
--- a/src/stdafx.h	Thu Jul 13 17:45:38 2017 +0000
+++ b/src/stdafx.h	Tue Jul 25 07:48:14 2017 +0200
@@ -148,6 +148,7 @@
 	#define CDECL
 	#define __int64 long long
 	#define GCC_PACK __attribute__((packed))
+	#define GCC_USED __attribute__ ((used))
 	/* Warn about functions using 'printf' format syntax. First argument determines which parameter
 	 * is the format string, second argument is start of values passed to printf. */
 	#define WARN_FORMAT(string, args) __attribute__ ((format (printf, string, args)))
@@ -162,6 +163,7 @@
 	#define NORETURN
 	#define CDECL
 	#define GCC_PACK
+	#define GCC_USED
 	#define WARN_FORMAT(string, args)
 	#define FINAL
 	#include <malloc.h>
@@ -232,6 +234,7 @@
 	#endif
 
 	#define GCC_PACK
+	#define GCC_USED
 	#define WARN_FORMAT(string, args)
 	#define FINAL sealed