Using built-in specs.
COLLECT_GCC=./arm-cortexa9_neon-linux-uclibcgnueabihf-gcc
COLLECT_LTO_WRAPPER=/opt/toolchains/arm-cortexa9_neon-linux-uclibcgnueabihf-gcc-7.4.0/bin/../libexec/gcc/arm-cortexa9_neon-linux-uclibcgnueabihf/7.4.0/lto-wrapper
Target: