OpenBSD clang version 10.0.1 
Target: amd64-unknown-openbsd6.8
Thread model: posix
InstalledDir: /usr/bin
Available CPUs for this target:

	amdfam10
	athlon
	athlon-4
	athlon-fx
	athlon-mp
	athlon-tbird
	athlon-xp
	athlon64
	athlon64-sse3
	atom
	barcelona
	bdver1
	bdver2
	bdver3
	bdver4
	bonnell
	broadwell
	btver1
	btver2
	c3
	c3-2
	cannonlake
	cascadelake
	cooperlake
	core-avx-i
	core-avx2
	core2
	corei7
	corei7-avx
	generic
	geode
	goldmont
	goldmont-plus
	haswell
	i386
	i486
	i586
	i686
	icelake-client
	icelake-server
	ivybridge
	k6
	k6-2
	k6-3
	k8
	k8-sse3
	knl
	knm
	lakemont
	nehalem
	nocona
	opteron
	opteron-sse3
	penryn
	pentium
	pentium-m
	pentium-mmx
	pentium2
	pentium3
	pentium3m
	pentium4
	pentium4m
	pentiumpro
	prescott
	sandybridge
	silvermont
	skx
	skylake
	skylake-avx512
	slm
	tigerlake
	tremont
	westmere
	winchip-c6
	winchip2
	x86-64
	yonah
	znver1
	znver2

Use -mcpu or -mtune to specify the target's processor.
For example, clang --target=aarch64-unknown-linux-gui -mcpu=cortex-a35