perf: Add LDFLAGS to allow build of old kernels without patching

The LDFLAGS is required or some old kernels fails due missing
symbols and this is preferred than requiring patches to every old
supported kernel.

Fixes [YOCTO: #5221]

(From OE-Core rev: 0eccbf2016e89e6f1c3796f138b02a508d2edbcf)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/meta/recipes-kernel/perf/perf.bb b/meta/recipes-kernel/perf/perf.bb
index 4a815ff2f8..269069f3af 100644
--- a/meta/recipes-kernel/perf/perf.bb
+++ b/meta/recipes-kernel/perf/perf.bb
@@ -60,6 +60,11 @@ B = "${WORKDIR}/${BPN}-${PV}"
 SCRIPTING_DEFINES = "${@perf_feature_enabled('perf-scripting', '', 'NO_LIBPERL=1 NO_LIBPYTHON=1',d)}"
 TUI_DEFINES = "${@perf_feature_enabled('perf-tui', '', 'NO_NEWT=1',d)}"
 
+# The LDFLAGS is required or some old kernels fails due missing
+# symbols and this is preferred than requiring patches to every old
+# supported kernel.
+LDFLAGS="-ldl -lutil"
+
 EXTRA_OEMAKE = \
                 '-C ${S}/tools/perf \
                 O=${B} \
@@ -88,13 +93,13 @@ PARALLEL_MAKE = ""
 
 do_compile() {
         # Linux kernel build system is expected to do the right thing
-        unset CFLAGS LDFLAGS
+        unset CFLAGS
         oe_runmake all
 }
 
 do_install() {
         # Linux kernel build system is expected to do the right thing
-        unset CFLAGS LDFLAGS
+        unset CFLAGS
         oe_runmake DESTDIR=${D} install
         # we are checking for this make target to be compatible with older perf versions
         if [ "${@perf_feature_enabled('perf-scripting', 1, 0, d)}" = "1" -a $(grep install-python_ext ${S}/tools/perf/Makefile) = "0"]; then