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string: Fix tester build with fortify enable with gcc 6

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When building with fortify enabled, GCC 6 issues an warning the fortify
wrapper might overflow the destination buffer.  However, GCC does not
provide a specific flag to disable the warning (the failure is tied to
-Werror).  So to avoid disable all errors, only enable the check for
GCC 7 or newer.

Checked on i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella Netto 2023-07-25 12:16:41 -03:00 committed by Adhemerval Zanella
parent dbc4b032dc
commit 784ae96811
1 changed files with 9 additions and 0 deletions
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9
string/tester.c
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@ -385,8 +385,17 @@ test_strncat (void)
(void) strcpy (one, "gh");
(void) strcpy (two, "ef");
/* When building with fortify enabled, GCC 6 issues an warning the fortify
wrapper might overflow the destination buffer. However, GCC does not
provide a specific flag to disable the warning (the failure is tied to
-Werror). So to avoid disable all errors, only enable the check for
GCC 7 or newer. */
#if __GNUC_PREREQ (7, 0)
(void) strncat (one, two, 99);
equal (one, "ghef", 5); /* Basic test encore. */
#else
equal (one, "gh", 2);
#endif
equal (two, "ef", 6); /* Stomped on source? */
(void) strcpy (one, "");