For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:osmocom:arm-elf-toolchain/openSUSE_Tumbleweed/home:mnhauke:osmocom:arm-elf-toolchain.repo
zypper refresh
zypper install arm-elf-gcc
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:osmocom:arm-elf-toolchain/16.0/home:mnhauke:osmocom:arm-elf-toolchain.repo
zypper refresh
zypper install arm-elf-gcc
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:osmocom:arm-elf-toolchain/15.6/home:mnhauke:osmocom:arm-elf-toolchain.repo
zypper refresh
zypper install arm-elf-gcc