diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -22,6 +22,8 @@
 #include "sanitizer_list.h"
 #include "sanitizer_mutex.h"
 
+#include <stdarg.h>
+
 #if defined(_MSC_VER) && !defined(__clang__)
 extern "C" void _ReadWriteBarrier();
 #pragma intrinsic(_ReadWriteBarrier)
@@ -186,6 +188,7 @@
 bool ColorizeReports();
 void RemoveANSIEscapeSequencesFromString(char *buffer);
 void Printf(const char *format, ...);
+void VariadicPrintf(const char *format, va_list ap);
 void Report(const char *format, ...);
 void SetPrintfAndReportCallback(void (*callback)(const char *));
 #define VReport(level, ...)                                              \
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc b/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
--- a/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
@@ -322,6 +322,10 @@
   va_end(args);
 }
 
+void VariadicPrintf(const char *format, va_list ap) {
+  SharedPrintfCode(false, format, ap);
+}
+
 // Like Printf, but prints the current PID before the output string.
 FORMAT(1, 2)
 void Report(const char *format, ...) {