[llvm-bugs] [Bug 42210] New: Regression(r361953): thinlto links take 3-4x as long as before

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https://bugs.llvm.org/show_bug.cgi?id=42210

            Bug ID: 42210
           Summary: Regression(r361953): thinlto links take 3-4x as long
                    as before
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

In Chromium, our builds using thinlto went from ~90 min to timing out after 4h
after r972373. This is because verifying all IR types is very expensive
apparently, see https://crbug.com/972373 comment 15.

See comment 16 for a repro case, but I'm guessing you can repro by linking any
larger executable with thinlto.

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