[PATCH] D144008: [DebugMetadata][DwarfDebug] Support function-local static variables in lexical block scopes (7/7)

[Kristina Bessonova via Phabricator via llvm-commits]

krisb added a comment.

@dblaikie

In D144008#4185551 <https://reviews.llvm.org/D144008#4185551>, @dblaikie wrote:

> @krisb - how's this handle cases of old IR being used in a newer compiler/linker?

There is no backward compatibility, old IR may cause DwarfDebug crash (it asserts that old IR is no longer supported) or miscompilation.
Implementing AutoUpgrade seems to be quite easy, but as far as I can see almost all the changes in debug metadata before were done w/o backward compatibility, so I haven't considered it yet.


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