===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/m4/parser.y,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -r1.6 -r1.7
--- src/usr.bin/m4/parser.y	2008/08/21 21:00:14	1.6
+++ src/usr.bin/m4/parser.y	2012/04/12 17:00:11	1.7
@@ -1,5 +1,5 @@
 %{
-/* $OpenBSD: parser.y,v 1.6 2008/08/21 21:00:14 espie Exp $ */
+/* $OpenBSD: parser.y,v 1.7 2012/04/12 17:00:11 espie Exp $ */
 /*
  * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
  *
@@ -15,6 +15,7 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+#include <math.h>
 #include <stdint.h>
 #define YYSTYPE	int32_t
 extern int32_t end_result;
@@ -33,6 +34,7 @@
 %left LSHIFT RSHIFT
 %left '+' '-'
 %left '*' '/' '%'
+%right EXPONENT
 %right UMINUS UPLUS '!' '~'
 
 %%
@@ -41,6 +43,7 @@
 	;
 expr 	: expr '+' expr { $$ = $1 + $3; }
      	| expr '-' expr { $$ = $1 - $3; }
+	| expr EXPONENT expr { $$ = pow($1, $3); }
      	| expr '*' expr { $$ = $1 * $3; }
 	| expr '/' expr {
 		if ($3 == 0) {