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tools/nolibc: stackprotector: mark implicitly used symbols as used
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>
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tools/include/nolibc/stackprotector.h
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tools/include/nolibc/stackprotector.h
···
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* triggering stack protector errors themselves
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*/
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-
__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))
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+
__attribute__((weak,used,noreturn,section(".text.nolibc_stack_chk")))
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void __stack_chk_fail(void)
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{
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pid_t pid;
···
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__stack_chk_fail();
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}
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-
__attribute__((weak,section(".data.nolibc_stack_chk")))
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+
__attribute__((weak,used,section(".data.nolibc_stack_chk")))
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uintptr_t __stack_chk_guard;
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static __no_stack_protector void __stack_chk_init(void)