[Bug target/101241] Internal compiler error from MathFunctions.h in the eigen library

[r.langer at itv dot rwth-aachen.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101241

--- Comment #8 from Raymond Langer <r.langer at itv dot rwth-aachen.de> ---
I didn't configure gcc myself. I run gcc in a Clean Linux docker container:

docker run -it clearlinux /bin/bash

In the docker container, I run:

swupd bundle-add c-basic

gcc --version

gcc (Clear Linux OS for Intel Architecture) 11.1.1 20210617
releases/gcc-11.1.0-303-ge86ad5ad01
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The uploaded file does not compile with: 

g++ -c a-eigen_bug.ii -Ofast