Do not use a virtual varargs function

This stuff breaks in some compiler (configurations)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/NullOutputFile.h b/src/NullOutputFile.h
index c152f108..ff14ef1b 100644
--- a/src/NullOutputFile.h
+++ b/src/NullOutputFile.h
@@ -43,7 +43,7 @@ class NullOutputFile:public OutputFile {
 public:
   virtual ~NullOutputFile() {}
   virtual size_t write(const char* str) { return 0; }
-  virtual int printf(const char* format, ...) { return 0; }
+  virtual int vprintf(const char* format, va_list va) { return 0; }
   virtual int flush() { return 0; }
   virtual bool supportsColor() { return false; }
 };