ref-manual: Add documentation for INCOMPATIBLE_LICENSE_EXCEPTIONS

(From yocto-docs rev: 2a7732bce71b4a493f6bb081b545de6ac586b88a)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/migration-guides/migration-4.0.rst

@@ -45,7 +45,7 @@ The following variables have changed their names:
 - ``SSTATE_DUPWHITELIST`` became ``SSTATE_ALLOW_OVERLAP_FILES``
 - ``SYSROOT_DIRS_BLACKLIST`` became :term:`SYSROOT_DIRS_IGNORE`
 - ``UNKNOWN_CONFIGURE_WHITELIST`` became :term:`UNKNOWN_CONFIGURE_OPT_IGNORE`
-- ``WHITELIST_<license>`` became ``INCOMPATIBLE_LICENSE_EXCEPTIONS``
+- ``WHITELIST_<license>`` became :term:`INCOMPATIBLE_LICENSE_EXCEPTIONS`
 
 In addition, ``BB_STAMP_WHITELIST``, ``BB_STAMP_POLICY``, ``INHERIT_BLACKLIST``,
 ``TUNEABI``, ``TUNEABI_WHITELIST``, and ``TUNEABI_OVERRIDE`` have been removed.

documentation/ref-manual/variables.rst

@@ -3547,6 +3547,14 @@ system and gives an overview of their function and contents.
          remove dependencies on or provide alternatives to components that
          are required to produce a functional system image.
 
+   :term:`INCOMPATIBLE_LICENSE_EXCEPTIONS`
+      Specifies a space-separated list of package and license pairs that
+      are allowed to be used even if the license is specified in
+      :term:`INCOMPATIBLE_LICENSE`. The package and license pairs are
+      separated using a colon. Example::
+
+         INCOMPATIBLE_LICENSE_EXCEPTIONS = "gdbserver:GPL-3.0-only gdbserver:LGPL-3.0-only"
+
    :term:`INHERIT`
       Causes the named class or classes to be inherited globally. Anonymous
       functions in the class or classes are not executed for the base