[llvm-bugs] [Bug 42210] New: Regression(r361953): thinlto links take 3-4x as long as before
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Jun 9 12:24:48 PDT 2019
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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