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-rw-r--r--libio/libioP.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/libio/libioP.h b/libio/libioP.h
index a2800524ec..fe81115094 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -25,6 +25,14 @@
    This exception applies to code released by its copyright holders
    in files containing the exception.  */
 
+/* NOTE: libio is now exclusively used only by glibc since libstdc++ has its
+   own implementation.  As a result, functions that were implemented for C++
+   (like *sputn) may no longer have C++ semantics.  This is of course only
+   relevant for internal callers of these functions since these functions are
+   not intended for external use otherwise.
+
+   FIXME: All of the C++ cruft eventually needs to go away.  */
+
 #include <errno.h>
 #ifndef __set_errno
 # define __set_errno(Val) errno = (Val)