Fangrui Song 52fc6ffcda [ELF] Refine isExported/isPreemptible condition ...

Reland 994cea3f0a after bolt tests no
longer rely on -pie --unresolved-symbols=ignore-all with no input DSO
generating PLT entries.

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Commit f10441ad00 , while dropping a
special case for isUndefWeak and --no-dynamic-linking, made
--export-dynamic ineffective when -pie is used without any input DSO.

This change restores --export-dynamic and unifies -pie and -pie
--no-dynamic-linker when there is no input DSO.

* -pie with no input DSO suppresses undefined symbols in .dynsym.
  Previously this only appied to -pie --no-dynamic-linker.
* As a side effect, -pie with no input DSO suppresses PLT.

2025-02-05 21:16:00 -08:00

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