linuxptp: Fix cross build

Adjust incdefs.sh to use cross tools to poke for system functionality
Re-enable using incdefs.sh
export KBUILD_OUTPUT to point to recipe sysroot

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-connectivity/linuxptp/linuxptp/Use-cross-cpp-in-incdefs.patch

@@ -0,0 +1,26 @@
+From 8a4cad5e2f2cbb6a34bdc6e877fe499502b8c4c8 Mon Sep 17 00:00:00 2001
+From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
+Date: Fri, 23 Dec 2016 18:12:29 +0100
+Subject: [PATCH] linuxptp: Use cross cpp in incdefs
+
+Use cross cpp incdefs.sh shell script since we are doing cross compiling
+we need to ensure we use correct setttings from toolchain
+
+Upstream-Status: Inappropriate [OE-Specific]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+
+ makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/incdefs.sh
++++ b/incdefs.sh
+@@ -27,7 +27,7 @@ user_flags()
+ 	printf " -D_GNU_SOURCE"
+ 
+ 	# Get list of directories searched for header files.
+-	dirs=$(echo "" | ${CROSS_COMPILE}cpp -Wp,-v 2>&1 >/dev/null | grep ^" /")
++	dirs=$(${CPP} -Wp,-v -xc /dev/null 2>&1 >/dev/null | grep ^" /")
+ 
+ 	# Look for clock_adjtime().
+ 	for d in $dirs; do

meta-oe/recipes-connectivity/linuxptp/linuxptp/no-incdefs-using-host-headers.patch

@@ -1,29 +0,0 @@
-From 8a4cad5e2f2cbb6a34bdc6e877fe499502b8c4c8 Mon Sep 17 00:00:00 2001
-From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
-Date: Fri, 23 Dec 2016 18:12:29 +0100
-Subject: [PATCH] linuxptp: no incdefs using host headers
-
-Avoid using host headers via incdefs.sh shell script.
-
-Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
----
-
- makefile | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/makefile b/makefile
-index 8cdbd15..85174b8 100644
---- a/makefile
-+++ b/makefile
-@@ -33,7 +33,7 @@ OBJECTS	= $(OBJ) hwstamp_ctl.o phc2sys.o phc_ctl.o pmc.o pmc_common.o \
- SRC	= $(OBJECTS:.o=.c)
- DEPEND	= $(OBJECTS:.o=.d)
- srcdir	:= $(dir $(lastword $(MAKEFILE_LIST)))
--incdefs := $(shell $(srcdir)/incdefs.sh)
-+#incdefs := $(shell $(srcdir)/incdefs.sh)
- version := $(shell $(srcdir)/version.sh $(srcdir))
- VPATH	= $(srcdir)
- 
--- 
-2.9.3
-

meta-oe/recipes-connectivity/linuxptp/linuxptp_3.0.bb

@@ -4,14 +4,15 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
 SRC_URI = "http://sourceforge.net/projects/linuxptp/files/v${PV}/linuxptp-${PV}.tgz \
            file://build-Allow-CC-and-prefix-to-be-overriden.patch \
-           file://no-incdefs-using-host-headers.patch \
+           file://Use-cross-cpp-in-incdefs.patch \
            "
 
 SRC_URI[md5sum] = "1318805702eb6d59f9f247e1dd5ce12a"
 SRC_URI[sha256sum] = "d74ceca722c75bfff53c633425f926dd48eb04f4a089451b855155c016d15785"
 
-EXTRA_OEMAKE = "ARCH=${TARGET_ARCH} \
+EXTRA_OEMAKE = "ARCH=${TARGET_ARCH} EXTRA_CFLAGS='${CFLAGS}'"
-    EXTRA_CFLAGS='-D_GNU_SOURCE -DHAVE_CLOCK_ADJTIME -DHAVE_POSIX_SPAWN -DHAVE_ONESTEP_SYNC ${CFLAGS}'"
+
+export KBUILD_OUTPUT="${RECIPE_SYSROOT}"
 
 do_install () {
     install -d ${D}/${bindir}