[Bug c++/91387] New: Segfault using -flto

[gcc-bugzilla at tobias dot goedderz.info]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91387

            Bug ID: 91387
           Summary: Segfault using -flto
           Product: gcc
           Version: 8.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bugzilla at tobias dot goedderz.info
  Target Milestone: ---

Created attachment 46684
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46684&action=edit
Preprocessed source code

Hi,

I'm experiencing g++ segfaults during compilation. This is a "minimal" example
in terms of command line parameters, using the preprocessed source (which is
not minimal):

> $ /usr/bin/g++-8 -std=c++14 -O2 -flto -fno-devirtualize -c 
> ShapeContainerTest.ii
> during IPA pass: cp
> /home/tobias/Documents/ArangoDB/arangodb/arangodb/tests/Geo/ShapeContainerTest.cpp:
>  In function ‘arangodb::velocypack::Builder::openCompoundValue(unsigned char) 
> [clone .part.119]’:
> /home/tobias/Documents/ArangoDB/arangodb/arangodb/tests/Geo/ShapeContainerTest.cpp:427:2:
>  internal compiler error: Segmentation fault
>  }}
>   ^
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.

This is with g++ (Ubuntu 8.3.0-6ubuntu1~18.04.1) 8.3.0.

I have two other files exhibiting a similar error, if it's of interest. The one
referenced above is attached.

Please tell me if and how I can be of further help.

Best regards,

Tobias