callback.h:struct host_callback_struct compilation error on Windows hosts.

On Windows, a recent gnulib update imported the lstat module, and
this caused a remote-sim.c build failure in struct host_callback_struct:

    In file included from /[...]/gdb/remote-sim.c:34:0:
    /[...]/gdb/../include/gdb/callback.h:93:9: error: duplicate member '_stati64'
       int (*lstat) (host_callback *, const char *, struct stat *);
             ^
What happens it that gnulib's stat.h makes the following defines:

     /* Large File Support on native Windows.  */
     #if 1
     # define stat _stati64
     #endif

and then:

    #if 1
    # if ! 0
    /* mingw does not support symlinks, therefore it does not have lstat.  But
       without links, stat does just fine.  */
    #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
    #   define lstat stat
    #  endif

So, the following fields in struct host_callback_struct...

      int (*stat) (host_callback *, const char *, struct stat *);
      int (*fstat) (host_callback *, int, struct stat *);
      int (*lstat) (host_callback *, const char *, struct stat *);

... get translated to...

      int (*_stati64) (host_callback *, const char *, struct _stati64 *);
      int (*_fstati64) (host_callback *, int, struct _stati64 *);
      int (*_stati64) (host_callback *, const char *, struct _stati64 *);

... which causes two fields to have the same name.

This patch fixes the issue by renaming the stat-related fields
by adding a "to_" prefix, similar to what is done in GDB's
target_ops vector.

include/gdb/ChangeLog:

	* callback.h (struct host_callback_struct) <to_stat>: Renamed
	from "stat".
	<to_fstat>: Renamed from "fstat".
	<to_lstat>: Renamed from "lstat".

sim/common/ChangeLog:

	* sim-io.c (sim_io_stat, sim_io_fstat): Adjust calls to "stat"
	and "fstat" callbacks by calls to "to_stat" and "to_fstat" (resp)
	callbacks following renaming in callback.h.
	* syscall.c (cb_syscall): Likewise.  Adjust calls to "lstat"
	callback by call to "to_lstat" callback

sim/cris/ChangeLog:

	* traps.c (cris_break_13_handler): Adjust call to "fstat" callback
	by call to "to_fstat" following renaming in callback.h.

sim/h8300/ChangeLog:

	* compile.c (sim_resume):  Adjust calls to "stat" and "fstat"
	callbacks by calls to "to_stat" and "to_fstat" (resp) callbacks
	following renaming in callback.h.

3 files changed, 13 insertions, 5 deletions

diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog
index 64f2081..3c85626 100644
--- a/sim/common/ChangeLog
+++ b/sim/common/ChangeLog
@@ -1,3 +1,11 @@
+2014-12-03  Joel Brobecker  <brobecker@adacore.com>
+
+	* sim-io.c (sim_io_stat, sim_io_fstat): Adjust calls to "stat"
+	and "fstat" callbacks by calls to "to_stat" and "to_fstat" (resp)
+	callbacks following renaming in callback.h.
+	* syscall.c (cb_syscall): Likewise.  Adjust calls to "lstat"
+	callback by call to "to_lstat" callback
+
 2014-08-28  Gary Benson  <gbenson@redhat.com>
 
 	* sim-trace.h (debug_printf): New define.
diff --git a/sim/common/sim-io.c b/sim/common/sim-io.c
index 918137b..1114ec6 100644
--- a/sim/common/sim-io.c
+++ b/sim/common/sim-io.c
@@ -391,11 +391,11 @@ sim_io_poll_read (SIM_DESC sd,
 int
 sim_io_stat (SIM_DESC sd, const char *path, struct stat *buf)
 {
-  return STATE_CALLBACK (sd)->stat (STATE_CALLBACK (sd), path, buf);
+  return STATE_CALLBACK (sd)->to_stat (STATE_CALLBACK (sd), path, buf);
 }
 
 int
 sim_io_fstat (SIM_DESC sd, int fd, struct stat *buf)
 {
-  return STATE_CALLBACK (sd)->fstat (STATE_CALLBACK (sd), fd, buf);
+  return STATE_CALLBACK (sd)->to_fstat (STATE_CALLBACK (sd), fd, buf);
 }
diff --git a/sim/common/syscall.c b/sim/common/syscall.c
index 397cd80..b5cb1ca 100644
--- a/sim/common/syscall.c
+++ b/sim/common/syscall.c
@@ -455,7 +455,7 @@ cb_syscall (host_callback *cb, CB_SYSCALL *sc)
 	    result = -1;
 	    goto FinishSyscall;
 	  }
-	result = (*cb->stat) (cb, path, &statbuf);
+	result = (*cb->to_stat) (cb, path, &statbuf);
 	free (path);
 	if (result < 0)
 	  goto ErrorFinish;
@@ -488,7 +488,7 @@ cb_syscall (host_callback *cb, CB_SYSCALL *sc)
 	struct stat statbuf;
 	TADDR addr = sc->arg2;
 
-	result = (*cb->fstat) (cb, sc->arg1, &statbuf);
+	result = (*cb->to_fstat) (cb, sc->arg1, &statbuf);
 	if (result < 0)
 	  goto ErrorFinish;
 	buflen = cb_host_to_target_stat (cb, NULL, NULL);
@@ -526,7 +526,7 @@ cb_syscall (host_callback *cb, CB_SYSCALL *sc)
 	    result = -1;
 	    goto FinishSyscall;
 	  }
-	result = (*cb->lstat) (cb, path, &statbuf);
+	result = (*cb->to_lstat) (cb, path, &statbuf);
 	free (path);
 	if (result < 0)
 	  goto ErrorFinish;