diff --git a/external/gpl3/gcc.old/dist/libstdc++-v3/config/io/basic_file_stdio.cc b/external/gpl3/gcc.old/dist/libstdc++-v3/config/io/basic_file_stdio.cc
index ba830fb9e97d..a6c9a4e249d2 100644
--- a/external/gpl3/gcc.old/dist/libstdc++-v3/config/io/basic_file_stdio.cc
+++ b/external/gpl3/gcc.old/dist/libstdc++-v3/config/io/basic_file_stdio.cc
@@ -190,7 +190,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   { this->close(); }
 
   __basic_file<char>*
-  __basic_file<char>::sys_open(__c_file* __file, ios_base::openmode)
+  __basic_file<char>::sys_open(__c_file* __file, ios_base::openmode __mode)
   {
     __basic_file* __ret = NULL;
     if (!this->is_open() && __file)
@@ -199,7 +199,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	// POSIX guarantees that fflush sets errno on error, but C doesn't.
 	errno = 0;
 	do
-	  __err = fflush(__file);
+	  __err = (__mode == std::ios_base::in ? 0 : fflush(__file));
 	while (__err && errno == EINTR);
 	errno = __save_errno;
 	if (!__err)