[PATCH] D86539: [Debuginfo][llvm-dwarfutil] llvm-dwarfutil dsymutil-like tool for ELF.

Tue Mar 29 03:38:22 PDT 2022

jhenderson added inline comments.

================
Comment at: llvm/docs/CommandGuide/llvm-dwarfutil.rst:31-38
+            Removes pieces of debug information related to the discarded sections.
+            When the linker does garbage collection the abandoned debug info is left
+            behind. That abandoned debug info references address ranges using
+            tombstone value. Thus, when this option is specified, the tool removes
+            debug info which marked with the tombstone value. That cures
+            "overlapping address ranges" errors reported by :program:`llvm-dwarfdump`.
+
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avl wrote:
> jhenderson wrote:
> > jhenderson wrote:
> > > I don't think you need the deleted sentence. Also, if it is enabled by default, how is it disabled, and why does the option actually need to exist?
> > There's no need for such massive indentation. A couple of spaces is sufficient. Same applies throughout.
> It might be disabled in this way:
> 
> ```
> --do-garbage-collection=0
> 
> ```
> 
> So the option assumed to be used to disable the behavior or to enable it explicitly.
This is one of those cl::opt oddities. It's basically undocumented too, so I don't think we should aim to support this approach if switching to tablegen style instead. I would instead add `--no-...` style options to explicitly disable things (there are some good examples of this.

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https://reviews.llvm.org/D86539