> glibc is LGPL, so I don't see how that should change anything?
glibc requires libgcc[0], which is GPLv3 (with runtime exception). The same for libstdc++[1].
[0] https://gcc.gnu.org/onlinedocs/gccint/Libgcc.html [1] https://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html