(A) Qt Creator doesn't seem to parse the C correctly. Things like
designated initializers and a few other C features here and there just
don't get parsed correctly, and the IDE stops being useful. I suspect
this is because things are actually being parsed in C++ mode. Bummer.
Developers: any interest in improving C support in Qt Creator?

(B) There is no way to tell Qt Creator that a particular header file
is included in every file -- that is, that gcc's "-include" is in use.
There is a way of messing with the "C++ Code Model" on a file-by-file
basis, for the duration of the time that the file is open, but no way
to automatically have it included in every file of the project. This
is a major hindrance. It means that every ifdef for every kconfig
option is a grayed out unclickable region, rendering most things
useless. Developers: any interest in fixing this? I spoke to a few of
you in IRC several months ago about this, and there was interest, but
it seems to have evaporated.