diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 279a3a579..453d802a9 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,13 @@
+Mon Feb 26 10:42:00 2001  Corinna Vinschen <corinna@vinschen.de>
+
+	* strace.cc (strace::vprntf): Move prntf functionality to this function
+	adding an va_list interface to strace.
+	(strace::printf): Calls strace::vprntf now.
+	(strace_printf): New function providing an extern "C" interface to
+	trace output.
+	* include/sys/strace.h: Make plain C clean.
+	(class strace): Add `vprntf' method.
+
 Mon Feb 26  0:10:00 2001  Corinna Vinschen <corinna@vinschen.de>
 
 	* shortcut.c: Remove #include <sys/strace.h>.
diff --git a/winsup/cygwin/include/sys/strace.h b/winsup/cygwin/include/sys/strace.h
index 37e9758dd..66f2c2cff 100644
--- a/winsup/cygwin/include/sys/strace.h
+++ b/winsup/cygwin/include/sys/strace.h
@@ -21,6 +21,8 @@
 
 #include <stdarg.h>
 
+#ifdef __cplusplus
+
 class strace
 {
   int vsprntf (char *buf, const char *func, const char *infmt, va_list ap);
@@ -33,11 +35,14 @@ public:
   int execing;
   strace() : version(1) {}
   void prntf (unsigned, const char *func, const char *, ...);
+  void vprntf (unsigned, const char *func, const char *, va_list ap);
   void wm (int message, int word, int lon);
 };
 
 extern strace strace;
 
+#endif /* __cplusplus */
+
 #define _STRACE_INTERFACE_ACTIVATE_ADDR  -1
 #define _STRACE_INTERFACE_ACTIVATE_ADDR1 -2
 
@@ -63,7 +68,18 @@ extern strace strace;
 #define _STRACE_THREAD	 0x40000 // thread-locking calls
 #define _STRACE_NOTALL	 0x80000 // don't include if _STRACE_ALL
 
-extern "C" void small_printf (const char *, ...);
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void small_printf (const char *, ...);
+void strace_printf (unsigned, const char *func, const char *, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#ifdef __cplusplus
 
 #ifdef NOSTRACE
 #define define_strace(c, f)
@@ -120,4 +136,5 @@ extern "C" void small_printf (const char *, ...);
 #define thread_printf(fmt, args...) strace_printf_wrap1(THREAD, fmt , ## args)
 #endif /*NEW_MACRO_VARARGS*/
 #endif /*NOSTRACE*/
+#endif /* __cplusplus */
 #endif /* _SYS_STRACE_H */
diff --git a/winsup/cygwin/strace.cc b/winsup/cygwin/strace.cc
index d13596ea4..0b908a7d3 100644
--- a/winsup/cygwin/strace.cc
+++ b/winsup/cygwin/strace.cc
@@ -183,17 +183,15 @@ strace::write (unsigned category, const char *buf, int count)
    Warning: DO NOT SET ERRNO HERE! */
 
 void
-strace::prntf (unsigned category, const char *func, const char *fmt, ...)
+strace::vprntf (unsigned category, const char *func, const char *fmt, va_list ap)
 {
   DWORD err = GetLastError ();
   int count;
   char buf[10000];
-  va_list ap;
 
   PROTECT(buf);
   SetLastError (err);
 
-  va_start (ap, fmt);
   count = this->vsprntf (buf, func, fmt, ap);
   CHECK(buf);
   if (category & _STRACE_SYSTEM)
@@ -210,6 +208,27 @@ strace::prntf (unsigned category, const char *func, const char *fmt, ...)
   SetLastError (err);
 }
 
+void
+strace::prntf (unsigned category, const char *func, const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  this->vprntf (category, func, fmt, ap);
+}
+
+extern "C" void
+strace_printf (unsigned category, const char *func, const char *fmt, ...)
+{
+  va_list ap;
+
+  if ((category & _STRACE_SYSTEM) || strace.active)
+    {
+      va_start (ap, fmt);
+      strace.vprntf (category, func, fmt, ap);
+    }
+}
+
 static NO_COPY const struct tab
 {
   int v;