This is a custom built buildroot toolchain based o gcc8.2 for sdm660 with optimisations for the chipset.

Everything on customisations can be found on defconfig.

All the licenses can be found here: http://toolchains.bootlin.com/downloads/releases/licenses/
All the sources can be found here: http://toolchains.bootlin.com/downloads/releases/sources/

PACKAGE        VERSION                     LICENSE
buildroot      2018.08-git-04520-g0184fa3  GPL-2.0+
gcc-final      8.2.0                       unknown
binutils       2.31.1                      GPL-3.0+, libiberty LGPL-2.1+
lzip           1.20                        GPL-2.0+
gmp            6.1.2                       LGPL-3.0+ or GPL-2.0+
m4             1.4.18                      GPL-3.0+
mpc            1.0.3                       LGPL-3.0+
mpfr           3.1.6                       LGPL-3.0+
gcc-initial    8.2.0                       unknown
gdb            8.1                         GPL-2.0+, LGPL-2.0+, GPL-3.0+, LGPL-3.0+
expat          2.2.5                       MIT
pkgconf        0.9.12                      pkgconf license
ncurses        6.1                         MIT with advertising clause
patchelf       0.9                         GPL-3.0+
musl           1.1.19                      MIT
linux-headers  4.4.154                     GPL-2.0
dash           0.5.10.2                    BSD-3-Clause, GPL-2.0+ (mksignames.c)
gdb            8.1                         GPL-2.0+, LGPL-2.0+, GPL-3.0+, LGPL-3.0+