[llvm-bugs] [Bug 52376] New: wasm64: unimplemented R_WASM_GLOBAL_INDEX_I64 using -generate-arange-section

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Nov 1 14:00:39 PDT 2021


            Bug ID: 52376
           Summary: wasm64: unimplemented R_WASM_GLOBAL_INDEX_I64 using
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: WebAssembly
          Assignee: unassignedbugs at nondot.org
          Reporter: alex at crichton.co
                CC: aardappel at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 25413
  --> https://bugs.llvm.org/attachment.cgi?id=25413&action=edit
reduced bytecode

In compiling some Rust code this is a crash that I've been seeing when enabling
debug information. It looks like the Rust compiler by default will pass the
`-generate-aragne-section` argument to LLVM which causes this crash, and
avoiding passing that flag will work. I've attached the bugpoint-reduced
bitcode here to this issue and can reproduce the crash with:

$ llc -filetype=obj -o foo.o -generate-arange-section
unimplemented R_WASM_GLOBAL_INDEX_I64
UNREACHABLE executed at
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
Stack dump:

I'll be updating the Rust compiler to avoid passing -generate-arange-section
now on the wasm64 target (temporarily), but figured it'd be good to open a bug

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