https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80196
--- Comment #4 from Roman <roman.morokutti at googlemail dot com> --- Thank you for your quick response. I am using Gentoo. I'll give that option a try. The build system is: /usr/local/bin/gcc --version gcc (GCC) 7.0.1 20170304 (experimental) Copyright (C) 2017 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. I'll report the result, when the build has finished, either by failure, or by success, respectively. Best regards, Roman