<div dir="ltr">Someone internally's been dabbling with turning on some of Google's build system's stricter header checking modes - and they caught these (you can check the internal code review 184305506 for the original where I'm pulling things out from).<br><br>& yeah, fair question about the modules builds - I don't fully understand what they catch and don't catch. I suspect it's a matter of whether the headers themselves form a cycle - whereas the Google build system's a bit more structured - knowing about libraries and explicit dependencies between them.<br><br>& I didn't look closely to see if, as I said, MC could depend on DebugInfoCodeView - probably weird/awkward/not what we want (I'm guessing?) but the modules buildbots don't have explicit dependencies, they just fail when they find a cycle. So they can implicitly support all sorts of weird dependencies we might not've expected/planned, so long as it's not an actual cycle (& only within the headers - so the modules system might be like "oh, sure, MC can depend on DebugInfoCodeView" but the library dependency might be the exact opposite (some MC .cpp file could call into DebugInfoCodeView & the modules build wouldn't fail - it knows nothing about .cpp modularity/grouping, just headers))</div><br><div class="gmail_quote"><div dir="ltr">On Wed, Mar 21, 2018 at 11:42 AM Zachary Turner <<a href="mailto:zturner@google.com">zturner@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Yes, some of the headers and stuff that are just raw structure definitions and enums could probably be sunk into BinaryFormat..<div><br></div><div>How'd you find this? Curious why it hasn't been breaking in modules builds for a long time.</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Mar 21, 2018 at 11:31 AM David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I'm looking at fixing some layering violations in LLVM & came across a few in the CodeView handling, specifically:<br><br>lib/MC/MCCodeView includes several llvm/DebugInfo/CodeView headers<br> I guess MC could be made dependent on DebugInfoCodeView? But probably these things should be sunk into BinaryFormat as is the case for DWARF features used by MC?<br><br><div>include/llvm/Object/COFF.h includes include/llvm/DebugInfo/CodeView/CVDebugRecord.h<br> Also seems like this could/should/needs to be sunk into BinaryFormat?<br><br>I'm open to ideas & happy to do the work, or help in any way that might be useful.<br><br>Thanks,<br>- Dave</div></div>
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