Compilation failure with gperf-3.0.1 and gcc-4.0.1

[Niels Möller]

Probably a known problem, but anyway: When compiling gperf-3.0.1 with
gcc-4.0.1, I get error messages on src/positions.h,

  g++ -O2 -mcpu=v9 -I. -I../../src/../lib -c ../../src/positions.cc
  ../../src/positions.h:74: error: 'PositionIterator' does not name a type
  ../../src/positions.h:77: error: 'PositionIterator' does not name a type
  ../../src/positions.h:79: error: 'PositionReverseIterator' does not name a 
type
  ../../src/positions.h:82: error: 'PositionReverseIterator' does not name a 
type
  ../../src/positions.icc:154: error: no 'PositionIterator
  Positions::iterator() const' member function declared in class 'Positions'

Adding forward declarations (trivial patch below) solves the problem.
In case it matters, this happened on SunOS 5.10.

Best regards,
/Niels


--- positions.h~        2003-04-07 11:48:19.000000000 +0200
+++ positions.h 2005-11-26 22:26:30.780114000 +0100
@@ -26,6 +26,10 @@
 #ifndef positions_h
 #define positions_h 1

+/* Forward declarations */
+class PositionIterator;
+class PositionReverseIterator;
+
 /* This class denotes a set of byte positions, used to access a
keyword.  */

 class Positions