Started as bug 632670, but ended with FEATURES="usersandbox" on x86_32. All needed info and logs are in that bugreport. Added FEATURES="${FEATURES} -usersandbox" in /etc/portage/env/nousersandbox.conf and dev-lisp/sbcl ousersandbox.conf sci-mathematics/maxima nousersandbox.conf in /etc/portage/package.env/nousersandbox solved for me merge of sbcl and maxima.
Thanks for the report. I've successfully built =dev-lisp/sbcl-1.4.1 on amd64 with =sys-devel/gcc-7.20 and =sys-libs/glibc-2.26-r2. Don't have access to an x86 arch so I can't reproduce this.
Can you reproduce this on dev-lisp/sbcl-1.4.7? Thanks.
I do not have anymore any x86 machines too.
Ok. Closing.