[OE-core] [PATCH] lttng-modules: allow building without tracepoints enabled in kernel

[Paul Eggleton]

Avoid a QA failure and instead produce a sensible warning message if no
modules were built.

Fixes [YOCTO #4791].

Signed-off-by: Paul Eggleton <paul.eggleton at linux.intel.com>
---
 meta/recipes-kernel/lttng/lttng-modules_2.1.1.bb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/meta/recipes-kernel/lttng/lttng-modules_2.1.1.bb b/meta/recipes-kernel/lttng/lttng-modules_2.1.1.bb
index 700c4c5..0bbaa81 100644
--- a/meta/recipes-kernel/lttng/lttng-modules_2.1.1.bb
+++ b/meta/recipes-kernel/lttng/lttng-modules_2.1.1.bb
@@ -22,3 +22,14 @@ export KERNEL_SRC="${STAGING_KERNEL_DIR}"
 
 
 S = "${WORKDIR}/git"
+
+do_install_append() {
+	# Delete empty directories to avoid QA failures if no modules were built
+	find ${D}/lib -depth -type d -empty -exec rmdir {} \;
+}
+
+python do_package_prepend() {
+    if not os.path.exists(os.path.join(d.getVar('D', True), 'lib/modules')):
+        bb.warn("%s: no modules were created; this may be due to CONFIG_TRACEPOINTS not being enabled in your kernel." % d.getVar('PN', True))
+}
+
-- 
1.8.1.2