externalsrc.bbclass: Make reparsing work for BBCLASSEXTENDed recipes
To make sure changes to any source files are detected when externalsrc
is used, it sets BB_DONT_CACHE to force the recipe to be reparsed
every time. Previously, this was done conditionally based on whether
EXTERNALSRC was set. This worked fine for building the base recipe.
But if one tried to build, e.g., a native version of it (provided via
BBCLASSEXTEND), the recipe would not be reparsed as expected.
To solve the above problem, BB_DONT_CACHE is now set for the base
recipe if EXTERNALSRC is set for it or any of it derivatives.
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
