diff --git a/misc/tst-ldbl-error.c b/misc/tst-ldbl-error.c
index 76b2c8f784..37ac9b65db 100644
--- a/misc/tst-ldbl-error.c
+++ b/misc/tst-ldbl-error.c
@@ -85,14 +85,15 @@ do_one_test (void *callback, const char *expected, ...)
   /* Call 'callback', which fills in the output and error buffers.  */
   result = support_capture_subprocess (callback, NULL);
 
-  /* The functions err, errx, verr, and verrx print just the program
-     name followed by a colon, whereas error and error_at_line print the
-     whole path to the program.  Since the whole path depends on the
-     working directory used to build and test glibc, remove it from the
-     comparison against the expected result.  */
-  const char *needle = "tst-ldbl-error:";
+  /* Filter out the name of the program (which should always end with
+     -error), so that the test case can be reused by ldbl-opt and
+     ldbl-128ibm-compat.  */
+  const char *needle = "-error:";
   char *message;
   message = strstr (result.err.buffer, needle);
+  if (message == NULL)
+    FAIL_EXIT1 ("test case error");
+  message += strlen (needle);
 
   /* Verify that the output message is as expected.  */
   TEST_COMPARE_STRING (message, expected);
@@ -104,12 +105,12 @@ static int
 do_test (void)
 {
   struct tests tests[] = {
-    { &callback_err, "tst-ldbl-error: -1.000000: Success\n" },
-    { &callback_errx, "tst-ldbl-error: -1.000000\n" },
-    { &callback_verr, "tst-ldbl-error: -1.000000: Success\n" },
-    { &callback_verrx, "tst-ldbl-error: -1.000000\n" },
-    { &callback_error, "tst-ldbl-error: -1.000000\n" },
-    { &callback_error_at_line, "tst-ldbl-error::0: -1.000000\n" }
+    { &callback_err, " -1.000000: Success\n" },
+    { &callback_errx, " -1.000000\n" },
+    { &callback_verr, " -1.000000: Success\n" },
+    { &callback_verrx, " -1.000000\n" },
+    { &callback_error, " -1.000000\n" },
+    { &callback_error_at_line, ":0: -1.000000\n" }
   };
 
   for (int i = 0; i < sizeof (tests) / sizeof (tests[0]); i++)
diff --git a/misc/tst-ldbl-warn.c b/misc/tst-ldbl-warn.c
index 69a528755c..f452d34f24 100644
--- a/misc/tst-ldbl-warn.c
+++ b/misc/tst-ldbl-warn.c
@@ -59,9 +59,21 @@ do_one_test (int select, const char *format, va_list args,
 
   stderr = old_stderr;
 
-  /* Close the in-memory stream and check the output buffer.  */
+  /* Close the in-memory stream.  */
   xfclose_memstream (&stream);
-  TEST_COMPARE_STRING (stream.buffer, expected);
+
+  /* Filter out the name of the program (which should always end with
+     warn), so that the test case can be reused by ldbl-opt and
+     ldbl-128ibm-compat.  */
+  const char *needle = "warn: ";
+  char *message;
+  message = strstr (stream.buffer, needle);
+  if (message == NULL)
+    FAIL_EXIT1 ("test case error");
+  message += strlen (needle);
+
+  /* Check that the rest of the output is as expected.  */
+  TEST_COMPARE_STRING (message, expected);
 
   if (stream.buffer != NULL)
     free (stream.buffer);
@@ -74,13 +86,11 @@ do_test_call_varg (const char *format, ...)
 
   va_start (args, format);
   do_one_test (VWARN, format, args, 0, 0, 0, 0,
-	       "tst-ldbl-warn: "
 	       "-1.000000 - -2.000000 - -3.000000 - -4.000000: Success\n");
   va_end (args);
 
   va_start (args, format);
   do_one_test (VWARNX, format, args, 0, 0, 0, 0,
-	       "tst-ldbl-warn: "
 	       "-1.000000 - -2.000000 - -3.000000 - -4.000000\n");
   va_end (args);
 }
@@ -92,10 +102,8 @@ do_test_call_rarg (const char *format, long double arg1, double arg2,
   va_list args;
   memset (&args, 0, sizeof (args));
   do_one_test (WARN, format, args, arg1, arg2, arg3, arg4,
-	       "tst-ldbl-warn: "
 	       "-1.000000 - -2.000000 - -3.000000 - -4.000000: Success\n");
   do_one_test (WARNX, format, args, arg1, arg2, arg3, arg4,
-	       "tst-ldbl-warn: "
 	       "-1.000000 - -2.000000 - -3.000000 - -4.000000\n");
 }
 
diff --git a/sysdeps/ieee754/ldbl-opt/Makefile b/sysdeps/ieee754/ldbl-opt/Makefile
index 8a2c129f5f..791a5eabd2 100644
--- a/sysdeps/ieee754/ldbl-opt/Makefile
+++ b/sysdeps/ieee754/ldbl-opt/Makefile
@@ -189,3 +189,19 @@ $(objpfx)tst-nldbl-argp.c: tst-ldbl-argp.c
 
 CFLAGS-tst-nldbl-argp.c += -mlong-double-64
 endif
+
+# Tests for err.h and error.h functions (reusing the relevant tests from
+# misc/).
+ifeq ($(subdir), misc)
+tests-internal += tst-nldbl-warn
+tests-internal += tst-nldbl-error
+
+$(objpfx)tst-nldbl-warn.c: tst-ldbl-warn.c
+	cp $< $@
+
+$(objpfx)tst-nldbl-error.c: tst-ldbl-error.c
+	cp $< $@
+
+CFLAGS-tst-nldbl-warn.c += -mlong-double-64
+CFLAGS-tst-nldbl-error.c += -mlong-double-64
+endif
