https://llvm.org/bugs/show_bug.cgi?id=27553
Bug ID: 27553
Summary: A lto build of clang with lld has 2624 more symbols
than with gold
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The problem is the handling of linkonce_odr.
The problem is that we set CanOmitFromDynSym for each file. This is a really
nice pattern that would extend naturally to having the same feature in ELF.
The issue is that with lazy loading of bitcode it has to be conservative since
it has not seen all the uses.
The gold plugin solves this problem by instead:
* Storing the name of every potential candidate.
* Checking if there are uses in the merged bitcode.
Probably the nicest way of solving this is adding an attribute that says that
the address of a GV is not taken.
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