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-rw-r--r--bits/typesizes.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/bits/typesizes.h b/bits/typesizes.h
index 3fd4a2e067..09959f2b45 100644
--- a/bits/typesizes.h
+++ b/bits/typesizes.h
@@ -61,6 +61,13 @@
 #define __SYSCALL_SLONG_TYPE	__SLONGWORD_TYPE
 #define __SYSCALL_ULONG_TYPE	__ULONGWORD_TYPE
 
+#ifdef __LP64__
+/* Tell the libc code that off_t and off64_t are actually the same type
+   for all ABI purposes, even if possibly expressed as different base types
+   for C type-checking purposes.  */
+# define __OFF_T_MATCHES_OFF64_T	1
+#endif
+
 /* Number of descriptors that can fit in an `fd_set'.  */
 #define	__FD_SETSIZE		1024