[glibc] string: Fix tester build with fortify enable with gcc < 12

[Rajalakshmi Srinivasaraghavan <raji@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f1c7ed0859a45929136836341741c7cd70f428cb

commit f1c7ed0859a45929136836341741c7cd70f428cb
Author: Mahesh Bodapati <bmahi496@linux.ibm.com>
Date:   Fri Aug 11 10:38:25 2023 -0500

    string: Fix tester build with fortify enable with gcc < 12
    
    When building with fortify enabled, GCC < 12 issues a warning on the
    fortify strncat wrapper might overflow the destination buffer (the
    failure is tied to -Werror).
    
    Checked on ppc64 and x86_64.
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 string/tester.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/string/tester.c b/string/tester.c
index f7d4bac5a8..824cf315ff 100644
--- a/string/tester.c
+++ b/string/tester.c
@@ -34,6 +34,14 @@
 DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-truncation");
 #endif
 
+/* When building with fortify enabled, GCC < 12 issues a warning on the
+   fortify strncat wrapper might overflow the destination buffer (the
+   failure is tied to -Werror).
+   Triggered by strncat fortify wrapper when it is enabled.  */
+#if __GNUC_PREREQ (11, 0)
+DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
+#endif
+
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -52,9 +60,6 @@ DIAG_IGNORE_NEEDS_COMMENT (5.0, "-Wmemset-transposed-args");
 DIAG_IGNORE_NEEDS_COMMENT (9, "-Wrestrict");
 DIAG_IGNORE_NEEDS_COMMENT (7, "-Wstringop-overflow=");
 #endif
-#if __GNUC_PREREQ (11, 0)
-DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
-#endif
 
 
 #define	STREQ(a, b)	(strcmp((a), (b)) == 0)