https://ftp.gnu.org/gnu/gdb/gdb-10.2.tar.gz
source交叉编译toolchain环境变量
或者
export CC=aarch64-linux-gnu-gcc
export CXX=aarch64-linux-gnu-g++
./configure --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-cross-prefix=aarch64-linux-gnu-
make -j 16