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-rw-r--r--include/stdio.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/stdio.h b/include/stdio.h
index 6718af4108..1c09daf13a 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -2,8 +2,18 @@
 # if !defined _ISOMAC && defined _IO_MTSAFE_IO
 #  include <stdio-lock.h>
 # endif
+
+/* Workaround PR90731 with GCC 9 when using ldbl redirects in C++.  */
+# include <bits/floatn.h>
+# if defined __cplusplus && __LONG_DOUBLE_USES_FLOAT128 == 1
+#  if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
+#    pragma GCC system_header
+#  endif
+# endif
+
 # include <libio/stdio.h>
 # ifndef _ISOMAC
+
 #  define _LIBC_STDIO_H 1
 #  include <libio/libio.h>