[OE-core] Quick question about OE-core/bitbake's re-building

[Joel Fernandes]

Hi,

How does it figure out when it needs to rebuild a package?

For example if I modify the file:
 ../meta/recipes-core/systemd/systemd-serialgetty/serial-getty at .service

Does it track the modification time to know it needs to rebuild
"systemd-serialgetty"?

Because doing such a modification didn't cause it to rebuild.

Even if I modify the recipe by simply opening it and writing to it, it
doesn't do any rebuild of the recipe. How is it normally supposed to work?

I have PRSERV turned on, I'm hoping that any modification to the recipe
itself or the files it installs should be enough to rebuild. So far, the
rebuild doesn't always happen.

thanks,
-Joel