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-rw-r--r--stdio-common/printf_fp.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index 0f598d87ef..dc5f47dc99 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -200,6 +200,8 @@ __printf_fp (FILE *fp,
   /* Nonzero if this is output on a wide character stream.  */
   int wide = info->wide;
 
+  auto wchar_t hack_digit (void);
+
   wchar_t hack_digit (void)
     {
       mp_limb_t hi;