[llvm-bugs] [Bug 42898] New: Clang compiler crashes

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42898

            Bug ID: 42898
           Summary: Clang compiler crashes
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: agner at agner.org
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Created attachment 22345
  --> https://bugs.llvm.org/attachment.cgi?id=22345&action=edit
Test case

The attached test case makes clang crash.

The error is detected on Clang version 6.0.0-1ubuntu2 under Windows subsystem
for Linux, Win 10.

The error does not occur under Cygwin64.

clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)

Complete crash report is included as a comment in test.cpp

Command line: clang -m64 -std=c++17 -O2 -mavx  test.cpp

I cannot produce a minimal test case because the error disappears even when I
remove seemingly irrelevant code.

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