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During LTO the references from the compiler-generated prologue and epilogues to the stack protector symbols are not visible and the symbols are removed. This will then lead to errors during linking. As those symbols are already #ifdeffed-out if unused mark them as "used" to prevent their removal. Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20240812-nolibc-lto-v2-2-736af7bbefa8@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>