+#if GNULIB_TEST_LOG2F
+SIGNATURE_CHECK (GNULIB_NAMESPACE::log2f, float, (float));
+#endif
+#if GNULIB_TEST_LOG2
+SIGNATURE_CHECK (GNULIB_NAMESPACE::log2, double, (double));
+#endif
+#if GNULIB_TEST_LOG2L
+SIGNATURE_CHECK (GNULIB_NAMESPACE::log2l, long double, (long double));
+#endif
+
+#if GNULIB_TEST_LOGBF
+SIGNATURE_CHECK (GNULIB_NAMESPACE::logbf, float, (float));
+#endif
+#if GNULIB_TEST_LOGB
+SIGNATURE_CHECK (GNULIB_NAMESPACE::logb, double, (double));
+#endif
+#if GNULIB_TEST_LOGBL
+SIGNATURE_CHECK (GNULIB_NAMESPACE::logbl, long double, (long double));
+#endif
+