The check for broken GCC should use src/bin/sage-env #24867
Description
The problem is that $SAGE_LOCAL/bin/sage-env is created as part of the build process. There is no guarantee that it exists after building GCC.
Component: build: configure
Author: Jeroen Demeyer
Branch/Commit: 3d62226
Reviewer: Matthias Koeppe
Issue created by migration from https://trac.sagemath.org/ticket/24867