powertop: Fix build for !uclibc

* EXTRA_LDFLAGS isn't defined for !uclibc and configure fails
  when it reads it unexpanded, see config.log snippet:

  configure:4177: checking whether the C compiler works
  configure:4199: i586-oe-linux-gcc  -m32 -march=i586 --sysroot=/OE/sysroots/qemux86  -O2 -pipe -g -feliminate-unused-debug-types  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed ${EXTRA_LDFLAGS} conftest.c  >&5
  i586-oe-linux-gcc: error: ${EXTRA_LDFLAGS}: No such file or directory
  configure:4203: $? = 1
  configure:4241: result: no

(From OE-Core rev: a3e9b391e1024d6d2e256b75c214d34e6693e332)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/meta/recipes-kernel/powertop/powertop_2.7.bb b/meta/recipes-kernel/powertop/powertop_2.7.bb
index dce5d715fd..5ba07e9ab9 100644
--- a/meta/recipes-kernel/powertop/powertop_2.7.bb
+++ b/meta/recipes-kernel/powertop/powertop_2.7.bb
@@ -14,8 +14,9 @@ SRC_URI[sha256sum] = "8d4b1490e2baad4467c0ded3c423db4472dcbf7b2dd8f8f2a928f54047
 inherit autotools gettext pkgconfig
 
 # we need to explicitly link with libintl in uClibc systems
-LDFLAGS += "${EXTRA_LDFLAGS}"
+EXTRA_LDFLAGS ?= ""
 EXTRA_LDFLAGS_libc-uclibc = "-lintl"
+LDFLAGS += "${EXTRA_LDFLAGS}"
 
 # we do not want libncursesw if we can
 do_configure_prepend() {