[llvm-bugs] [Bug 39579] New: clang++ (v. 7.0.0) segfault at -O2 but not -O1

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39579

            Bug ID: 39579
           Summary: clang++ (v. 7.0.0) segfault at -O2 but not -O1
           Product: clang
           Version: 7.0
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mb.hansen at chem.au.dk
                CC: llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Created attachment 21098
  --> https://bugs.llvm.org/attachment.cgi?id=21098&action=edit
clang++ output to stdout

Hi, my clang++ installation crashes when compiling a file c++ source file. 

```
$ clang++ --version
clang version 7.0.0 (tags/RELEASE_700/final)
Target: x86_64-apple-darwin17.7.0
Thread model: posix
InstalledDir: /usr/local/opt/llvm/bin
```

It segfaults with the -O2 flag, but not with -O1.

I'll attach the stdout output from clang++ as well as the three files asked in
the diagnostics message.
Attached file will be from running with -O2.

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