linker script hack - can it be made to work ?

From: jim.cromie@gmail.com
Date: 2021-01-14 21:48:18

Im attempting to conditionally link an input section.
if the just linked similarly named section wasnt empty.

__start___dyndbg = .; \
_ = .; \ \
KEEP(*(__dyndbg (.-_)? gnu.linkonce.d.__dyndbg)) \
__stop___dyndbg = .;

it gives me an unspecified linker syntax error
ld:./arch/x86/kernel/vmlinux.lds:46: syntax error

its pretty clear that this experiment is failing,
is there another way to do this ?

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