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string: Fix tester build with fortify enable with gcc 6
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>
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@ -385,8 +385,17 @@ test_strncat (void)
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(void) strcpy (one, "gh");
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(void) strcpy (two, "ef");
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/* When building with fortify enabled, GCC 6 issues an warning the fortify
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wrapper might overflow the destination buffer. However, GCC does not
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provide a specific flag to disable the warning (the failure is tied to
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-Werror). So to avoid disable all errors, only enable the check for
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GCC 7 or newer. */
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#if __GNUC_PREREQ (7, 0)
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(void) strncat (one, two, 99);
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equal (one, "ghef", 5); /* Basic test encore. */
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#else
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equal (one, "gh", 2);
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#endif
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equal (two, "ef", 6); /* Stomped on source? */
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(void) strcpy (one, "");
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