Watch this:
$ rm qapi/qapi-types-error.h
$ make
Generating qemu-version.h with a meson_exe.py custom command
Compiling C object qom/libqom.fa.p/object_interfaces.c.o
In file included from ../qom/object_interfaces.c:4:
/work/armbru/qemu/include/qapi/error.h:275:10: fatal error: qapi/qapi-types-error.h: No such file or directory
275 | #include "qapi/qapi-types-error.h"
| ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile.ninja:348: qom/libqom.fa.p/object_interfaces.c.o] Error 1
To recover, I have to run qapi-gen.py manually and exactly right, or
blow away the build tree and start over.
The old build system did what a build system should: it remade the files
that are missing or out of date.
I'm still too clueless about Meson to debug this, but I hope I can learn
from watching you fix it.
It looks like the ninja build handles that fine, so this is most likely a ninja2make conversion issue.