Introduce common-debug.h

This introduces common-debug.h.  This holds the functions debug_printf
and debug_vprintf, two functions that the common code can use to print
debugging messages.  Clients of the common code are expected to
implement debug_vprintf; a debug_vprintf function is written from
scratch for GDB, and gdbserver's existing debug_printf is repurposed
as debug_vprintf.

common/agent.c is changed to use debug_vprintf rather than
defining the macro DEBUG_AGENT depending on GDBSERVER.

nat/i386-dregs.c is changed to use the externally-implemented
debug_printf, rather than defining it itself.

gdb/ChangeLog:

	* common/common-debug.h: New file.
	* common/common-debug.c: Likewise.
	* debug.c: Likewise.
	* Makefile.in (SFILES): Add common/common-debug.c.
	(HFILES_NO_SRCDIR): Add common/common-debug.h.
	(COMMON_OBS): Add common-debug.o and debug.o.
	(common-debug.o): New rule.
	* common/common-defs.h: Include common-debug.h.
	* common/agent.c (debug_agent_printf): New function.
	(DEBUG_AGENT): Redefine.
	* nat/i386-dregs.c (debug_printf): Undefine.

gdb/gdbserver/ChangeLog:

	* Makefile.in (SFILES): Add common/common-debug.c.
	(OBS): Add common-debug.o.
	(common-debug.o): New rule.
	* debug.h (debug_printf): Don't declare.
	* debug.c (debug_printf): Renamed and rewritten as...
	(debug_vprintf): New function.

1 files changed, 4 insertions, 7 deletions

diff --git a/gdb/gdbserver/debug.c b/gdb/gdbserver/debug.c
index c50af76..339e33c 100644
--- a/gdb/gdbserver/debug.c
+++ b/gdb/gdbserver/debug.c
@@ -33,9 +33,8 @@ int debug_timestamp;
    previous call ended with "\n".  */
 
 void
-debug_printf (const char *msg, ...)
+debug_vprintf (const char *format, va_list ap)
 {
-  va_list args;
 #if !defined (IN_PROCESS_AGENT)
   /* N.B. Not thread safe, and can't be used, as is, with IPA.  */
   static int new_line = 1;
@@ -53,13 +52,11 @@ debug_printf (const char *msg, ...)
     }
 #endif
 
-  va_start (args, msg);
-  vfprintf (stderr, msg, args);
-  va_end (args);
+  vfprintf (stderr, format, ap);
 
 #if !defined (IN_PROCESS_AGENT)
-  if (*msg)
-    new_line = msg[strlen (msg) - 1] == '\n';
+  if (*format)
+    new_line = format[strlen (format) - 1] == '\n';
 #endif
 }