Fangrui Song 7c74ce3c68 [ELF] --wrap: don't clear sym->isUsedInRegularObj if real->isUsedInRegularObj; set wrap's initial binding to sym's ...

Fix PR49897: if `__real_foo` has the isUsedInRegularObj bit set, we need to
retain `foo` in .symtab, even if `foo` is undefined. The new behavior will match
GNU ld.

Before the patch, we produced an R_X86_64_JUMP_SLOT relocation referencing the
index 0 undefined symbol, which would be erroed by glibc
(see f96ff3c0f8).

While here, fix another bug: if `__wrap_foo` does not exist, its initial binding
should be `foo`'s.

2021-04-17 00:29:51 -07:00

9.8 KiB

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