Ah, TARGET_DIRS isn't being pruned anymore when a target is disabled for lack
of accelerator.
Paolo, side effect of 8a19980e3f ("configure: move accelerator logic to
meson")? I guess we should move the setting of TARGET_DIRS to meson as well.
TARGET_DIRS is pruned by Meson, I didn't add any back propagation to make because it is not really needed; qemu-iotests only every uses the "host architecture" QEMU binary (see tests/qemu-iotests/common.config), check-block + --target-list has never worked.
check-tcg could use the pruned TARGET_DIRS, but it is of limited use anyway with --disable-tcg.
At this point it may make sense to establish which config-host.mak variables are available in the Makefile, because there's probably just a handful. I won't have much time in the next couple of weeks though.
Paolo