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...ause many of the > `scope:` chains currently terminate at `MDFile`s or `null` instead of > `MDCompileUnit`s. Why? Because LTO type uniquing needs scope chains > to be identical. > > Ah, right. > > (side note: sometimes need to end in MDFile or we might need an equivalent of DILexicalBlockFile for the CU - to switch files within the same CU (things defined in headers, etc)) Ah, okay. I thought we could just replace them with pointers to the compile unit. Something like `DIFileScope` with `scope:` and `file:` fields would probably work? (Which means I shouldn't have merged the tw...

> On 2015 Apr 14, at 21:46, David Blaikie <dblaikie at gmail.com> wrote: > > On Tue, Apr 14, 2015 at 9:33 PM, Duncan P. N. Exon Smith > <dexonsmith at apple.com> wrote: >> >> `Function` definitions should support `MDNode` attachments, with a >> similar syntax to instructions: >> >> define void @foo() nounwind !attach !0 { >>