Using built-in specs. COLLECT_GCC=./cc COLLECT_LTO_WRAPPER=/root/gcc72/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ./configure --prefix=/root/gcc72 --enable-checking=release --disable-multilib Thread model: posix gcc version 8.0.0 20170917 (experimental) (GCC)