https://sourceware.org/bugzilla/show_bug.cgi?id=22269
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
elfxx-x86.h has
/* Is a undefined weak symbol which is resolved to 0. Reference to an
undefined weak symbol is resolved to 0 when building executable if
it isn't dynamic and
1. Has non-GOT/non-PLT relocations in text section. Or
2. Has no GOT/PLT relocation.
Local undefined weak symbol is always resolved to 0.
*/
#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
((EH)->elf.root.type == bfd_link_hash_undefweak \
&& (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \
|| (bfd_link_executable (INFO) \
&& (!(EH)->has_got_reloc \
|| (EH)->has_non_got_reloc))))
It may be useful for other targets.
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