[llvm-bugs] [Bug 38570] New: [WebAssembly] DWARF sections are invalid when LEB compression is applied (-O2)

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https://bugs.llvm.org/show_bug.cgi?id=38570

            Bug ID: 38570
           Summary: [WebAssembly] DWARF sections are invalid when LEB
                    compression is applied (-O2)
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ydelendik at mozilla.com
                CC: llvm-bugs at lists.llvm.org

(Created from https://reviews.llvm.org/D47901)

Currently, when -O2 linker optimization applied, the function bodies in the
code section are transformed (due to LEB compression). Which makes .debug_line
invalid -- data/references point to wrong location, and by its nature,
.debug_line section references is not easy to "relocate" since it is using
delta compression scheme.

The proposed in D47901 seems to complex. The workarounds now:
- don't use -O2 option (and rely on external tools to do compression),
- strip incorrect debug/DWARF sections

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