The EXTERNALSRC_EXTENSIONS variable holds a list of additional classes
that will be inherited when externalsrc is inherited.

Signed-off-by: Peter Kjellerstedt <[email protected]>
---

We have had a local copy of this class for a long time since we need
to make it suppport a local class when checking BBCLASSEXTEND. And
now we wanted to add some more functionality that should be active
when externalsrc is in use. So instead of forking the class even
more, I thought it would be better to make the upstream class
extendable. The solution was inspired by USERADDEXTENSION in
useradd.bbclass.

 meta/classes/externalsrc.bbclass | 5 +++++
 meta/conf/documentation.conf     | 1 +
 2 files changed, 6 insertions(+)

diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index abfe24bace..488d75760f 100644
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -265,3 +265,8 @@ def srctree_configure_hash_files(d):
     return ' '.join(out_items)
 
 EXPORT_FUNCTIONS do_buildclean
+
+# Use the following to extend externalsrc with custom functionality
+EXTERNALSRC_EXTENSIONS ??= ""
+
+inherit ${EXTERNALSRC_EXTENSIONS}
diff --git a/meta/conf/documentation.conf b/meta/conf/documentation.conf
index 80ad8e10d5..6d5b734b02 100644
--- a/meta/conf/documentation.conf
+++ b/meta/conf/documentation.conf
@@ -160,6 +160,7 @@ EXTENDPE[doc] = "Used with file and pathnames to create a 
prefix for a recipe's
 EXTENDPKGV[doc] = "The full package version specification as it appears on the 
final packages produced by a recipe."
 EXTERNALSRC[doc] = "If externalsrc.bbclass is inherited, this variable points 
to the source tree, which is outside of the OpenEmbedded build system."
 EXTERNALSRC_BUILD[doc] = "If externalsrc.bbclass is inherited, this variable 
points to the directory in which the recipe's source code is built, which is 
outside of the OpenEmbedded build system."
+EXTERNALSRC_EXTENSIONS[doc] = "A list of additional classes that will be 
inherited when externalsrc is inherited."
 EXTRA_IMAGE_FEATURES[doc] = "The list of additional features to include in an 
image. Configure this variable in the conf/local.conf file in the Build 
Directory."
 EXTRA_IMAGEDEPENDS[doc] = "A list of recipes to build that do not provide 
packages for installing into the root filesystem. Use this variable to list 
recipes that are required to build the final image, but not needed in the root 
filesystem."
 EXTRA_OECMAKE[doc] = "Additional cmake options."
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