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bitbake

What is the difference between ":=" and ".=" assignment in BitBake?

I saw in a BitBake .conf file:

BBPATH := "${TOPDIR}"

and

BBPATH .= ":${LAYERDIR}"

What is the difference between := and .=?

Solution

  • According to the BitBake manual:

    The := operator results in a variable's contents being expanded immediately.
    If you want to append or prepend values without an inserted space, use the .= and =. operators.