refs #140. Fixed zdot incompatibility ABI issue with GCC 4.7 on Win 32.

GCC 4.7 uses MSVC ABI on Win 32. This means the caller pops the hidden pointer for returning
aggregate structures larger than 8 bytes.

Author: xianyi

Makefile.system

@@ -149,6 +149,26 @@ EXTRALIB        += -defaultlib:advapi32
 SUFFIX  = obj
 PSUFFIX = pobj
 LIBSUFFIX = lib
+ifeq ($(C_COMPILER), GCC)
+#Test for supporting MS_ABI
+GCCVERSIONGTEQ4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 4)
+GCCVERSIONGT4 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \> 4)
+GCCMINORVERSIONGTEQ7 := $(shell expr `$(CC) -dumpversion | cut -f2 -d.` \>= 7)
+ifeq ($(GCCVERSIONGT4), 1)
+# GCC Majar version > 4
+# It is compatible with MSVC ABI. 
+CCOMMON_OPT	+= -DMS_ABI
+endif
+
+ifeq ($(GCCVERSIONGTEQ4), 1)
+ifeq ($(GCCMINORVERSIONGTEQ7), 1)
+# GCC Version >=4.7
+# It is compatible with MSVC ABI. 
+CCOMMON_OPT	+= -DMS_ABI
+endif
+endif
+
+endif
 endif
 
 ifeq ($(OSNAME), Interix)

kernel/x86/zdot_sse2.S

@@ -1541,6 +1541,16 @@
 	popl	%ebx
 	popl	%esi
 	popl	%edi
-/*remove the hidden return value address from the stack.*/
+#if defined(OS_WINNT) || defined(OS_CYGWIN_NT) || defined(OS_INTERIX)
+#ifdef MS_ABI
+/* For MingW GCC >= 4.7. It is compatible with MSVC ABI. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36834 */
+	ret
+#else
+/* remove the hidden return value address from the stack. For MingW GCC < 4.7 */
 	ret	$0x4
+#endif
+#else
+/*remove the hidden return value address from the stack on Linux.*/
+	ret $0x4
+#endif
 	EPILOGUE