I have tested this with Ubuntu Bionic host with lxc 3.0.0, the gitian-build for Windows and MacOSX work fine, but there is an issue about it for Linux. Failed at check-symbol:
0test/test_bitcoin: symbol __divmoddi4 from unsupported version GCC_7.0.0
1test/test_bitcoin: symbol log2f from unsupported version GLIBC_2.27
2qt/bitcoin-qt: symbol __divmoddi4 from unsupported version GCC_7.0.0
3qt/bitcoin-qt: symbol log2f from unsupported version GLIBC_2.27
I think this should be fixed in ./configure --enable-glibc-back-compat
Should not be merged before #13177 devrandom/gitian-builder#178
Close #12511