[llvm-bugs] [Bug 48827] New: older versions of wasm-ld crashes when when given object files built with llvm trunk

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48827

            Bug ID: 48827
           Summary: older versions of wasm-ld crashes when when given
                    object files built with llvm trunk
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: wasm
          Assignee: unassignedbugs at nondot.org
          Reporter: sbc at chromium.org
                CC: llvm-bugs at lists.llvm.org, sbc at chromium.org

We ran into issues where object files built with trunk version llvm were
causing crashes in older versions of wasm-ld.

I believe that this change added a new symbol type to pretty much all object
files which causes older versions of wasm-ld to crash:

https://reviews.llvm.org/D92215

Clearly we need to be able add new symbol types and relocations types I think
we can take a couple of measures here to make things smoother:

1. Report readable errors rather than crashing when new symbol types or
relocation types are added.

2. In this particular case we should avoid using this new symbol type unless we
truly need it.  i.e. we should revisit the discussion around whether to use a
table symbol for the default call_indirect table.

WDYT andy?   I can take a look at (1) but thats the easy bit.   Revisiting (2)
could be trickier?   I guess it will make the code less clean for longer but
avoiding breaking changes to the object format is also very compelling.

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