re PR target/33774 (Cygwin/mingw do not support 16 byte alignment of struct/union fields)

	PR target/33774
	* config/i386/cygming.h (BIGGEST_FIELD_ALIGNMENT): Define only if
	IN_TARGET_LIBS.

From-SVN: r130024

gcc/ChangeLog

+2007-11-08  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	PR target/33774
+	* config/i386/cygming.h (BIGGEST_FIELD_ALIGNMENT): Define only if
+	IN_TARGET_LIBS.
+
 2007-11-07  Kenneth Zadeck <zadeck@naturalbridge.com>
 
 	PR middle-end/33826

gcc/config/i386/cygming.h

@@ -332,9 +332,13 @@ do {							\
 #undef MAX_OFILE_ALIGNMENT
 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 
-/* Native complier aligns internal doubles in structures on dword boundaries.  */
+/* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
+   align internal doubles in structures on dword boundaries. Otherwise,
+   support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h.  */
+#ifdef IN_TARGET_LIBS
 #undef	BIGGEST_FIELD_ALIGNMENT
 #define BIGGEST_FIELD_ALIGNMENT 64
+#endif
 
 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 #undef PCC_BITFIELD_TYPE_MATTERS