cbfstool is always built with the host compiler and the cross toolchain is completely unsuitable for that.

This error doesn't seem to be related to glibc (which https://review.coreboot.org/38638 fixes), but to a compiler bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19449. It was also reported on the list at https://mail.coreboot.org/hyperkitty/list/coreboot@coreboot.org/message/HY2OB7IN5QU2T6Q7FSY5YMDFRJFXXWDM/, the affected compiler in that case was gcc 4.8.4, and I could reproduce the issue on a centos 7 system.

https://review.coreboot.org/c/coreboot/+/43143 and https://review.coreboot.org/c/coreboot/+/43144 force the creation of the bootstrap compiler for gcc < 4.9 and tell xcompile to look for a host compiler in the cross compiler directory when collecting compilers, which should resolve the issue (after running crossgcc.)

Resolved by https://review.coreboot.org/c/coreboot/+/43143, https://review.coreboot.org/c/coreboot/+/43144 and https://review.coreboot.org/c/coreboot/+/43145: Creating a toolchain with a host compiler older than gcc 4.9 now leads to a bootstrap build, and the bootstrap compiler is picked up as host compiler by default.