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Commit ac2224c0 authored by Fangrui Song's avatar Fangrui Song
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[ELF] --exclude-libs: localize defined libcall symbols referenced by lto.tmp

Fixes PR48681: after LTO, lto.tmp may reference a libcall symbol not in an IR
symbol table of any bitcode file. If such a symbol is defined in an archive
matched by a --exclude-libs, we don't correctly localize the symbol.

Add another `excludeLibs` after `compileBitcodeFiles` to localize such libcall
symbols. Unfortunately we have keep the existing one for D43126.

Using VER_NDX_LOCAL is an implementation detail of `--exclude-libs`, it does not
necessarily tie to the "localize" behavior.  `local:` patterns in a version
script can be omitted.
The `symbol ... has undefined version ...` error should not be exempted.
Ideally we should error as GNU ld does. https://issuetracker.google.com/issues/73020933

Reviewed By: psmith

Differential Revision: https://reviews.llvm.org/D94280
parent be179b99
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