gdb merge fails on arm64-musl-llvm

[necktwi]

$ sudo wgetpaste -s dpaste -c "emerge --info '=sys-devel/gdb-13.2-r1::gentoo'"
Your paste can be seen here: http://dpaste.com/B4Z3PNJWG
$ sudo wgetpaste -s dpaste -c "emerge -pqv '=sys-devel/gdb-13.2-r1::gentoo'"
Your paste can be seen here: http://dpaste.com/3PZAWZ5L9
$ sudo wgetpaste -s dpaste /var/tmp/portage/sys-devel/gdb-13.2-r1/temp/build.log
Pasting > 250 kB often tend to fail with dpaste. Use --verbose or --debug to see the
error output from wget if it fails. Alternatively use another pastebin service.
Your paste can be seen here: http://dpaste.com/8SW8ADUA7
$ sudo wgetpaste -s dpaste /var/tmp/portage/sys-devel/gdb-13.2-r1/temp/environment
Your paste can be seen here: http://dpaste.com/6Z3B6VJNN