[PATCH 3/4] cross.bbclass: add virtclass handler

[Otavio Salvador <otavio@ossystems.com.br>]

Allow use of BBCLASSEXTEND with 'cross' and use of virtclass-cross in
recipes.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
---
 meta/classes/cross.bbclass |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/meta/classes/cross.bbclass b/meta/classes/cross.bbclass
index 5681ab9..a764902 100644
--- a/meta/classes/cross.bbclass
+++ b/meta/classes/cross.bbclass
@@ -55,6 +55,45 @@ libexecdir = "${exec_prefix}/libexec/${CROSS_TARGET_SYS_DIR}"
 
 do_populate_sysroot[sstate-inputdirs] = "${SYSROOT_DESTDIR}/${STAGING_DIR_NATIVE}"
 
+python cross_virtclass_handler () {
+    if not isinstance(e, bb.event.RecipePreFinalise):
+        return
+
+    classextend = e.data.getVar('BBCLASSEXTEND', True) or ""
+    if "cross" not in classextend:
+        return
+
+    pn = e.data.getVar("PN", True)
+    if not pn.endswith("-cross"):
+        return
+
+    def map_dependencies(varname, d, suffix = ""):
+        if suffix:
+            varname = varname + "_" + suffix
+        deps = d.getVar(varname, True)
+        if not deps:
+            return
+        deps = bb.utils.explode_deps(deps)
+        newdeps = []
+        for dep in deps:
+            if dep.endswith("-cross"):
+                newdeps.append(dep)
+            else:
+                newdeps.append(dep + "-cross")
+        bb.data.setVar(varname, " ".join(newdeps), d)
+
+    for pkg in (e.data.getVar("PACKAGES", True).split() + [""]):
+        map_dependencies("RDEPENDS", e.data, pkg)
+        map_dependencies("RRECOMMENDS", e.data, pkg)
+        map_dependencies("RSUGGESTS", e.data, pkg)
+        map_dependencies("RPROVIDES", e.data, pkg)
+        map_dependencies("RREPLACES", e.data, pkg)
+
+    bb.data.setVar("OVERRIDES", e.data.getVar("OVERRIDES", False) + ":virtclass-cross", e.data)
+}
+
+addhandler cross_virtclass_handler
+
 do_install () {
 	oe_runmake 'DESTDIR=${D}' install
 }
-- 
1.7.2.5