bios-tables-test and iasl

[Ani Sinha]

So I was working late scratching my head yesterday on why I was not getting my 
ASL diff on mismatched blobs! Turns out there were two things:

(a) iasl was not installed and I completely forgot about it because my old 
setup is gone and the new box is, well new and I did not get to mess around 
with tables up until now. This was easy to figure out.
(b) I recalled that previously all I had to do was install iasl and the binary 
would just produce the diff because it would discover iasl was in the PATH. Now 
it seemed no matter what I did I was not able to get the diff until I rebased 
and it triggered a clean build of qemu tree. Turns out, now we check iasl 
existence from meson and CONFIG_IASL is set from the build time (if not set, 
*iasl is NULL and no diff is generated).

So I wonder if we have made our lives any easier? Why should we need to rebuild 
the entire tree if all we wanted was to debug a test breakage? Sure we could 
always run iasl manually but isn’t it easier to simply run "V=1 make 
check-qtest” and let the test spit it out for us?

A