log tests: Avoid test failure with nvc 22.1

[Bruno Haible]

With nvc 22.1, I observe a test failure:

FAIL: test-log
==============

../../gltests/test-log.h:68: assertion 'err > - err_bound / TWO_MANT_DIG && err 
< err_bound / TWO_MANT_DIG' failed

This patch works around it, by allowing a slightly larger error bound.


2022-01-15  Bruno Haible  <bruno@clisp.org>

        log tests: Avoid test failure with nvc 22.1.
        * tests/test-log.h (test_function): With nvc, expect up to 4 ulps error.

diff --git a/tests/test-log.h b/tests/test-log.h
index 7246650217..8b082c629b 100644
--- a/tests/test-log.h
+++ b/tests/test-log.h
@@ -54,7 +54,13 @@ test_function (void)
 #else
        L_(3.0)
 #endif
-       : L_(3.0));
+       :
+#if defined __x86_64__ && defined __EDG__
+       L_(5.0)
+#else
+       L_(3.0)
+#endif
+      );
 
     for (i = 0; i < SIZEOF (RANDOM); i++)
       {