[yocto] Does PACKAGECONFIG only apply to autotools recipes

[Alan Martinovic]

Hi,
is it true that that PACKAGECONFIG is only used
 for recipes that inherit autoconf?

Was trying to understand what they do in a recipe:
    https://git.yoctoproject.org/cgit.cgi/poky/plain/meta/recipes-connectivity/bluez5/bluez5.inc
and didn't really get what this was about until found
the autoconf reference mentioned in a book.

So "features" as referenced in the mega manual:
    https://www.yoctoproject.org/docs/2.4/mega-manual/mega-manual.html#var-PACKAGECONFIG
are the flags that will end up being passed to ./configure?

However later in the recipe it's used to populate other variables

    NOINST_TOOLS = " \
        ${@bb.utils.contains('PACKAGECONFIG', 'readline',
'${NOINST_TOOLS_READLINE}', '', d)} \
        ${@bb.utils.contains('PACKAGECONFIG', 'testing',
'${NOINST_TOOLS_TESTING}', '', d)} \
        ${@bb.utils.contains('PACKAGECONFIG', 'tools',
'${NOINST_TOOLS_BT}', '', d)} \
    "

Is the original assumption true (that it's an autoconf only thing)?
Is there a way to test that by grepping the code (didn't found
autoconf references when greping for PACKAGECONFIG in
bitbake -e bluez5)?

Be Well :)