lttng-ust: fix do_compile error when PACKAGECONFIG examples is enabled

when PACKAGECONFIG enabled examples, compile failed with error:
fix below compile error during PACKGAGECONFIG examples is enabled:
tmp/work/corei7-64-wrs-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/x86_64-wrs-linux/../../libexec/x86_64-wrs-linux/gcc/x86_64-wrs-linux/11.2.0/ld: warning: liblttng-ust-common.so.1, needed by ../../../src/lib/lttng-ust/.libs/liblttng-ust.so, not found (try using -rpath or -rpath-link)
tmp/work/corei7-64-wrs-linux/lttng-ust/2_2.13.0-r0/recipe-sysroot-native/usr/bin/x86_64-wrs-linux/../../libexec/x86_64-wrs-linux/gcc/x86_64-wrs-linux/11.2.0/ld: warning: liblttng-ust-tracepoint.so.1, needed by ../../../src/lib/lttng-ust/.libs/liblttng-ust.so, not found (try using -rpath or -rpath-link)

(From OE-Core rev: 907ebb5bb3d44dd5f68deb238098fb6f6413e2d4)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 36 insertions, 0 deletions

diff --git a/meta/recipes-kernel/lttng/lttng-ust/0001-Makefile.am-update-rpath-link.patch b/meta/recipes-kernel/lttng/lttng-ust/0001-Makefile.am-update-rpath-link.patch
new file mode 100644
index 0000000000..cbbf1df812
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-ust/0001-Makefile.am-update-rpath-link.patch
@@ -0,0 +1,35 @@
+From 06279f50e924d1d55b43eb3b299f6633ecb1f7a4 Mon Sep 17 00:00:00 2001
+From: Changqing Li <changqing.li@windriver.com>
+Date: Wed, 22 Sep 2021 16:33:10 +0800
+Subject: [PATCH] Makefile.am: update rpath link
+
+since commit 6339062 Move liblttng-ust to 'src/lib/',
+liblttng-ust.so/liblttng-ust-common.so/liblttng-ust-tracepoint.so
+'s location changed from one dir to multiple dirs. which make below
+error:
+ld: warning: liblttng-ust-common.so.1, needed by ../../../src/lib/lttng-ust/.libs/liblttng-ust.so, not found (try using -rpath or -rpath-link)
+ld: warning: liblttng-ust-tracepoint.so.1, needed by ../../../src/lib/lttng-ust/.libs/liblttng-ust.so, not found (try using -rpath or -rpath-link)
+
+Upstream-Status: Submitted [https://github.com/lttng/lttng-ust/pull/61]
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+---
+ doc/examples/Makefile.am | 2 +-
+ 1 file changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/doc/examples/Makefile.am b/doc/examples/Makefile.am
+index 8ee0564..20d246c 100644
+--- a/doc/examples/Makefile.am
++++ b/doc/examples/Makefile.am
+@@ -142,7 +142,7 @@ all-local:
+                                CFLAGS='$(CFLAGS)' \
+                                AM_CFLAGS='$(AM_CFLAGS)' \
+                                LDFLAGS="$(LDFLAGS)" \
+-                               AM_LDFLAGS='$(AM_LDFLAGS) -L../../../src/lib/lttng-ust/.libs -Wl,-rpath="$(PWD)/../../src/lib/lttng-ust/.libs/" -Wl,-rpath-link="$(PWD)/../../src/lib/lttng-ust/.libs/"' \
++                               AM_LDFLAGS='$(AM_LDFLAGS) -L../../../src/lib/lttng-ust/.libs -Wl,-rpath="$(PWD)/../../src/lib/lttng-ust/.libs/" -Wl,-rpath-link="$(PWD)/../../src/lib/lttng-ust/.libs/:$(PWD)/../../src/lib/lttng-ust-tracepoint/.libs:$(PWD)/../../src/lib/lttng-ust-common/.libs/"' \
+                                LTTNG_GEN_TP_PATH="$$rel_src_subdir$(top_srcdir)/tools/" \
+                                AM_V_P="$(AM_V_P)" \
+                                AM_V_at="$(AM_V_at)" \
+-- 
+2.17.1
+
diff --git a/meta/recipes-kernel/lttng/lttng-ust_2.13.0.bb b/meta/recipes-kernel/lttng/lttng-ust_2.13.0.bb
index 3b0e205ab8..4ec92c0683 100644
--- a/meta/recipes-kernel/lttng/lttng-ust_2.13.0.bb
+++ b/meta/recipes-kernel/lttng/lttng-ust_2.13.0.bb
@@ -30,6 +30,7 @@ PE = "2"
 SRC_URI = "https://lttng.org/files/lttng-ust/lttng-ust-${PV}.tar.bz2 \
            file://0001-python-lttngust-Makefile.am-Add-install-lib-to-setup.patch \
            file://0001-lttng-ust-common-link-with-liburcu-explicitly.patch \
+           file://0001-Makefile.am-update-rpath-link.patch \
            "
 
 SRC_URI[sha256sum] = "54e4c933679cf6a07971dc5861ce57fc4876ab740ab612407b30b5fc85371750"