===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/m4/parser.y,v
retrieving revision 1.6
retrieving revision 1.7
diff -c -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 ****
  %{
! /* $OpenBSD: parser.y,v 1.6 2008/08/21 21:00:14 espie Exp $ */
  /*
   * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
   *
--- 1,5 ----
  %{
! /* $OpenBSD: parser.y,v 1.7 2012/04/12 17:00:11 espie Exp $ */
  /*
   * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
   *
***************
*** 15,20 ****
--- 15,21 ----
   * 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;
***************
*** 33,38 ****
--- 34,40 ----
  %left LSHIFT RSHIFT
  %left '+' '-'
  %left '*' '/' '%'
+ %right EXPONENT
  %right UMINUS UPLUS '!' '~'
  
  %%
***************
*** 41,46 ****
--- 43,49 ----
  	;
  expr 	: expr '+' expr { $$ = $1 + $3; }
       	| expr '-' expr { $$ = $1 - $3; }
+ 	| expr EXPONENT expr { $$ = pow($1, $3); }
       	| expr '*' expr { $$ = $1 * $3; }
  	| expr '/' expr {
  		if ($3 == 0) {