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-rw-r--r--math/bits/mathcalls.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/math/bits/mathcalls.h b/math/bits/mathcalls.h
index 951a3d0090..4fc18659f8 100644
--- a/math/bits/mathcalls.h
+++ b/math/bits/mathcalls.h
@@ -380,6 +380,9 @@ __END_NAMESPACE_C99
 #endif
 
 #if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Test equality.  */
+__MATHDECL_1 (int, __iseqsig,, (_Mdouble_ __x, _Mdouble_ __y));
+
 /* Test for signaling NaN.  */
 __MATHDECL_1 (int, __issignaling,, (_Mdouble_ __value))
      __attribute__ ((__const__));