0001-Replace-pow-with-powl-under-x86_64-w64-mingw32.patch

From a9a511fd4a5c7ae5c7570154a6a0eb636e4bc7d5 Mon Sep 17 00:00:00 2001
From: Hiroshi Shirosaki <h.shirosaki@gmail.com>
Date: Sat, 28 Jul 2012 10:00:32 +0900
Subject: [PATCH] Replace pow() with powl() under x86_64-w64-mingw32

Replace pow() implementation because of broken pow() with mingw x64.
---
 win/tcl.m4        | 10 ++++++++++
 win/tclWin32Dll.c |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/win/tcl.m4 b/win/tcl.m4
index 83a4ea3..e20e6af 100644
--- a/win/tcl.m4
+++ b/win/tcl.m4
@@ -521,6 +521,16 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 
 	EXTRA_CFLAGS="${extra_cflags}"
 
+	AC_EGREP_CPP(yes,
+	[#ifdef __MINGW64__
+	  yes
+	#endif
+	], is_mingw64=yes, is_mingw64=no)
+
+	if test "$is_mingw64" = "yes"; then
+	    EXTRA_CFLAGS="-fno-builtin-pow ${extra_cflags}"
+	fi
+
 	CFLAGS_DEBUG=-g
 	CFLAGS_OPTIMIZE="-O2 -fomit-frame-pointer"
 	CFLAGS_WARNING="-Wall"
diff --git a/win/tclWin32Dll.c b/win/tclWin32Dll.c
index 6c863b9..35d0c39 100644
--- a/win/tclWin32Dll.c
+++ b/win/tclWin32Dll.c
@@ -1232,6 +1232,14 @@ TclWinCPUID(
 #endif
     return status;
 }
+
+#ifdef __MINGW64__
+#include <math.h>
+double pow(double x, double y)
+{
+    return powl(x, y);
+}
+#endif
 
 /*
  * Local Variables:
-- 
1.7.11.msysgit.1