tree bf591236fa58ffeca22413a5e02f0a3437074634
parent 75915044cf21fffa1b6444cb1f50cad71e237c20
author Fangrui Song <i@maskray.me> 1618644591 -0700
committer Copybara-Service <copybara-worker@google.com> 1618719916 -0700

[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 f96ff3c0f8ebd941b3f6b345164c3d858b781484).

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

GitOrigin-RevId: 7c74ce3c686938e95a08a05ea1e2a714eac43167