merge from gcc

include/floatformat.h

@@ -23,6 +23,10 @@ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
 
 #include "ansidecl.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* A floatformat consists of a sign bit, an exponent and a mantissa.  Once the
    bytes are concatenated according to the byteorder flag, then each of those
    fields is contiguous.  We number the bits with 0 being the most significant
@@ -149,4 +153,8 @@ floatformat_from_double (const struct floatformat *, const double *, void *);
 extern int
 floatformat_is_valid (const struct floatformat *fmt, const void *from);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif	/* defined (FLOATFORMAT_H) */