[llvm-bugs] [Bug 35751] New: .dynamic relocation entries omitted if output contains only IFUNC relocations

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35751

            Bug ID: 35751
           Summary: .dynamic relocation entries omitted if output contains
                    only IFUNC relocations
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: emaste at freebsd.org
                CC: llvm-bugs at lists.llvm.org

When linking output that contains only ifunc relocations (e.g.
R_X86_64_IRELATIVE) we miss the the DT_PLTREL, DT_JMPREL, DT_PLTGOT,
DT_PLTRELSZ .dynamic entries.

There is a reproducer at https://kib.kiev.ua/kib/kernel.tar. This is a patched
FreeBSD kernel using ifuncs.

We emit DT_PLTREL etc. only if InX::RelaPlt is not empty, but ifunc relocations
are stored in RelaIplt.

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