Change dynwind flag enums to #defines, for greater portability

Thanks to Inge Gutheil for raising this problem.

* doc/ref/api-control.texi (Dynamic Wind): Remove doc for
  scm_t_dynwind_flags, and change uses of scm_t_dynwind_flags to int.
  Mention possible flags inside doc for scm_dynwind_begin instead.
  Similarly for scm_t_wind_flags.  In this case the doc on possible
  flags is moved to after the four functions that can use them.

* libguile/dynwind.c (scm_dynwind_begin): Change scm_t_dynwind_flags
  to int.
  (scm_dynwind_unwind_handler): Change scm_t_wind_flags to int.
  (scm_dynwind_rewind_handler): Ditto.
  (scm_dynwind_unwind_handler_with_scm): Ditto.
  (scm_dynwind_rewind_handler_with_scm): Ditto.

* libguile/dynwind.h (SCM_F_DYNWIND_REWINDABLE): Use #define instead
  of typedef enum.
  (SCM_F_WIND_EXPLICITLY): Ditto.
  (function declarations): Change scm_t_dynwind_flags and
  scm_t_wind_flags to int.

* test-suite/standalone/test-unwind.c (check_cont_body): Change
  scm_t_dynwind_flags to int.

doc/ref/api-control.texi

@@ -1276,21 +1276,7 @@ a-cont
 @end lisp
 @end deffn
 
-@deftp {C Type} scm_t_dynwind_flags
+@deftypefn {C Function} void scm_dynwind_begin (int flags)
-This is an enumeration of several flags that modify the behavior of
-@code{scm_dynwind_begin}.  The flags are listed in the following
-table.
-
-@table @code
-@item SCM_F_DYNWIND_REWINDABLE
-The dynamic context is @dfn{rewindable}.  This means that it can be
-reentered non-locally (via the invokation of a continuation).  The
-default is that a dynwind context can not be reentered non-locally.
-@end table
-
-@end deftp
-
-@deftypefn {C Function} void scm_dynwind_begin (scm_t_dynwind_flags flags)
 The function @code{scm_dynwind_begin} starts a new dynamic context and
 makes it the `current' one.
 
@@ -1315,6 +1301,14 @@ or explicitly with @code{scm_dynwind_end}.  You must make sure that a
 dynwind context is indeed ended properly.  If you fail to call
 @code{scm_dynwind_end} for each @code{scm_dynwind_begin}, the behavior
 is undefined.
+
+Possible flags are:
+@table @code
+@item SCM_F_DYNWIND_REWINDABLE
+The dynamic context is @dfn{rewindable}.  This means that it can be
+reentered non-locally (via the invokation of a continuation).  The
+default is that a dynwind context can not be reentered non-locally.
+@end table
 @end deftypefn
 
 @deftypefn {C Function} void scm_dynwind_end ()
@@ -1322,22 +1316,8 @@ End the current dynamic context explicitly and make the previous one
 current.
 @end deftypefn
 
-@deftp {C Type} scm_t_wind_flags
+@deftypefn {C Function} void scm_dynwind_unwind_handler (void (*func)(void *), void *data, int flags)
-This is an enumeration of several flags that modify the behavior of
+@deftypefnx {C Function} void scm_dynwind_unwind_handler_with_scm (void (*func)(SCM), SCM data, int flags)
-@code{scm_dynwind_unwind_handler} and
-@code{scm_dynwind_rewind_handler}.  The flags are listed in the
-following table.
-
-@table @code
-@item SCM_F_WIND_EXPLICITLY
-@vindex SCM_F_WIND_EXPLICITLY
-The registered action is also carried out when the dynwind context is
-entered or left locally.
-@end table
-@end deftp
-
-@deftypefn {C Function} void scm_dynwind_unwind_handler (void (*func)(void *), void *data, scm_t_wind_flags flags)
-@deftypefnx {C Function} void scm_dynwind_unwind_handler_with_scm (void (*func)(SCM), SCM data, scm_t_wind_flags flags)
 Arranges for @var{func} to be called with @var{data} as its arguments
 when the current context ends implicitly.  If @var{flags} contains
 @code{SCM_F_WIND_EXPLICITLY}, @var{func} is also called when the
@@ -1347,8 +1327,8 @@ The function @code{scm_dynwind_unwind_handler_with_scm} takes care that
 @var{data} is protected from garbage collection.
 @end deftypefn
 
-@deftypefn {C Function} void scm_dynwind_rewind_handler (void (*func)(void *), void *data, scm_t_wind_flags flags)
+@deftypefn {C Function} void scm_dynwind_rewind_handler (void (*func)(void *), void *data, int flags)
-@deftypefnx {C Function} void scm_dynwind_rewind_handler_with_scm (void (*func)(SCM), SCM data, scm_t_wind_flags flags)
+@deftypefnx {C Function} void scm_dynwind_rewind_handler_with_scm (void (*func)(SCM), SCM data, int flags)
 Arrange for @var{func} to be called with @var{data} as its argument when
 the current context is restarted by rewinding the stack.  When @var{flags}
 contains @code{SCM_F_WIND_EXPLICITLY}, @var{func} is called immediately
@@ -1358,6 +1338,15 @@ The function @code{scm_dynwind_rewind_handler_with_scm} takes care that
 @var{data} is protected from garbage collection.
 @end deftypefn
 
+The possible flags for the preceding four functions are as follows.
+
+@table @code
+@item SCM_F_WIND_EXPLICITLY
+@vindex SCM_F_WIND_EXPLICITLY
+The registered action is also carried out when the dynwind context is
+entered or left locally.
+@end table
+
 @deftypefn {C Function} void scm_dynwind_free (void *mem)
 Arrange for @var{mem} to be freed automatically whenever the current
 context is exited, whether normally or non-locally.

libguile/dynwind.c

@@ -154,7 +154,7 @@ static scm_t_bits tc16_winder;
 #define WINDER_MARK_P(w)     (SCM_SMOB_FLAGS(w) & WINDER_F_MARK)
 
 void
-scm_dynwind_begin (scm_t_dynwind_flags flags)
+scm_dynwind_begin (int flags)
 {
   SCM f;
   SCM_NEWSMOB (f, tc16_frame, 0);
@@ -192,8 +192,7 @@ scm_dynwind_end (void)
 }
 
 void
-scm_dynwind_unwind_handler (void (*proc) (void *), void *data,
+scm_dynwind_unwind_handler (void (*proc) (void *), void *data, int flags)
-			    scm_t_wind_flags flags)
 {
   SCM w;
   SCM_NEWSMOB2 (w, tc16_winder,	(scm_t_bits) proc, (scm_t_bits) data);
@@ -203,8 +202,7 @@ scm_dynwind_unwind_handler (void (*proc) (void *), void *data,
 }
 
 void
-scm_dynwind_rewind_handler (void (*proc) (void *), void *data,
+scm_dynwind_rewind_handler (void (*proc) (void *), void *data, int flags)
-			    scm_t_wind_flags flags)
 {
   SCM w;
   SCM_NEWSMOB2 (w, tc16_winder,	(scm_t_bits) proc, (scm_t_bits) data);
@@ -215,8 +213,7 @@ scm_dynwind_rewind_handler (void (*proc) (void *), void *data,
 }
 
 void
-scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data,
+scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data, int flags)
-				     scm_t_wind_flags flags)
 {
   SCM w;
   scm_t_bits fl = ((flags&SCM_F_WIND_EXPLICITLY)? WINDER_F_EXPLICIT : 0);
@@ -226,8 +223,7 @@ scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data,
 }
 
 void
-scm_dynwind_rewind_handler_with_scm (void (*proc) (SCM), SCM data,
+scm_dynwind_rewind_handler_with_scm (void (*proc) (SCM), SCM data, int flags)
-				     scm_t_wind_flags flags)
 {
   SCM w;
   SCM_NEWSMOB2 (w, tc16_winder, (scm_t_bits) proc, SCM_UNPACK (data));

libguile/dynwind.h

@@ -43,26 +43,21 @@ SCM_INTERNAL void scm_init_dynwind (void);
 
 SCM_API void scm_swap_bindings (SCM vars, SCM vals);
 
-typedef enum {
+/* Flags for scm_dynwind_begin. */
-  SCM_F_DYNWIND_REWINDABLE = (1 << 0)
+#define SCM_F_DYNWIND_REWINDABLE 1
-} scm_t_dynwind_flags;
 
-typedef enum {
+/* Flags for scm_dynwind_unwind_handler(_with_scm) and
-  SCM_F_WIND_EXPLICITLY = (1 << 0)
+   scm_dynwind_rewind_handler(_with_scm). */
-} scm_t_wind_flags;
+#define SCM_F_WIND_EXPLICITLY 1
 
-SCM_API void scm_dynwind_begin (scm_t_dynwind_flags);
+SCM_API void scm_dynwind_begin (int);
 SCM_API void scm_dynwind_end (void);
 
-SCM_API void scm_dynwind_unwind_handler (void (*func) (void *), void *data,
+SCM_API void scm_dynwind_unwind_handler (void (*) (void *), void *, int);
-					 scm_t_wind_flags);
+SCM_API void scm_dynwind_rewind_handler (void (*) (void *), void *, int);
-SCM_API void scm_dynwind_rewind_handler (void (*func) (void *), void *data,
-					 scm_t_wind_flags);
 
-SCM_API void scm_dynwind_unwind_handler_with_scm (void (*func) (SCM), SCM data,
+SCM_API void scm_dynwind_unwind_handler_with_scm (void (*) (SCM), SCM, int);
-						  scm_t_wind_flags);
+SCM_API void scm_dynwind_rewind_handler_with_scm (void (*) (SCM), SCM, int);
-SCM_API void scm_dynwind_rewind_handler_with_scm (void (*func) (SCM), SCM data,
-						  scm_t_wind_flags);
 
 SCM_API void scm_dynwind_free (void *mem);
 

test-suite/standalone/test-unwind.c

@@ -136,7 +136,7 @@ check_flag1 (const char *tag, void (*func)(void), int val)
 SCM
 check_cont_body (void *data)
 {
-  scm_t_dynwind_flags flags = (data? SCM_F_DYNWIND_REWINDABLE : 0);
+  int flags = (data? SCM_F_DYNWIND_REWINDABLE : 0);
   int first;
   SCM val;