Enable the kernel-yocto bbclass to use enhanced capabilities from
the kern-tools symbol_why.pl.
We bump the kern-tools SRCREV to pickup the reworking of symbol_why,
which uses Kconfiglib to provide analysis on configuration values.
This is useful for debugging why a symbol specified in a fragment
did not end up in the final .config.
We introduce two ways to interact with the new symbol_why:
1) a replacement of the existing kconf_check script
2) a dedicated task that is explicitly invoked to dump details
on the configuration.
The kconf_check replacement is transparent to the user, and is
run in exactly the same way as it was previously. But we get better
output and more detailed diagnostics if there are symbols that
don't make it into the final .config
The second way to interact with symbol why is via the new task
do_config_analysis. This is invoked like any other task, and by
default will provide a full configuration analysis and point the
user at files to look at for details.
If a more targetted analysis is desired, then specific symbols
can be set in the CONFIG_ANALYSIS variable. When this variable
is set, the task will only run for the given symbols and provide
per-variable links to the user. This variable can be set like
any other, including specification in the local.conf:
