[llvm-bugs] [Bug 28349] New: "unknown version name ... used as a dependency" error with empty version definition hierarchies

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28349

            Bug ID: 28349
           Summary: "unknown version name ... used as a dependency" error
                    with empty version definition hierarchies
           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
    Classification: Unclassified

In FreeBSD version maps we sometimes have hierarchies that add no new symbols,
for example:

FBSD_1.1 {
global:
        GSS_C_NT_ANONYMOUS;
        ...
} FBSD_1.0;

FBSD_1.2 {
} FBSD_1.1;

FBSD_1.3 {
} FBSD_1.2;

FBSD_1.4 {
} FBSD_1.3;

FBSDprivate_1.0 {
global:
        ...
        _gss_mg_collect_error;
local:
        *;
} FBSD_1.4;

LLD reports errors for this case:
unknown version name FBSD_1.3 used as a dependency
unknown version name FBSD_1.4 used as a dependency

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