Kbuild updates for v4.14

- Use Make-builtin $(abspath ...) helper to get absolute path
 
 - Add W=2 extra warning option to detect unused macros
 
 - Use more KCONFIG_CONFIG instead hard-coded .config
 
 - Fix bugs of tar*-pkg targets
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJZupWLAAoJED2LAQed4NsGVEEQAItJ0y1uxDr0cjJNE46N6p6+
 EMCWKWC2H0XR9oFRY1y5utYWIwRauIaESgGg1qMU6Lbg5qZamggpNrYVH207tCz1
 gNkU8wwc2SXpxJy2eG2asxY9L2mL0a5fFFOgxIxoz+hCTgr4Yk1IGnTH9+GPQKtW
 thduXxTvcB4/oNTOgUHNj/7j9ydn7ETTOjsCoaEwBZqtBaaEBj20h6EOhgX+ouMd
 5P9YoCbfk28KHKlnMd8sNHV5SLKb94wCwoM/QIOLl42rwIAc81dUgOmaMGeflXF9
 zBH1exi4ID9SyQyuMZemJNe0bD6YR2qG0Sf1t2eDnhxmcav7Vwk+WV7Pdpr8UWw8
 Lot9yPJQA43kfYj6pfCJFXzWEduNT48zGGBJb30WyGkBkidNNGkujdSeI36swEQD
 fPV9tHPk48OSNPqJWZXehezBqN9U5Sa1M9dk5TNA69mzdZgNp052flxywBQ/SGTO
 +h17SREP9Mm6CQ9ApfHaOlMr40/mpCCDq+p8pfem5ZtnBby9k4uNp2P9hAMTJdw8
 5AOdwB0MdzvMQgF5UO0kklk6HGUZTAGHi91k5k3e+DPydt9+2ntZFZoVwVYaD756
 E55KKrQZqSO758gnN9Wbr8ihgOhNI3ZA320nCjfwQdnUqQ496KAkLpgVALF8pEVi
 /xIBawfQNj9BlDc3Y3jo
 =Tam1
 -----END PGP SIGNATURE-----

Merge tag 'kbuild-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Use Make-builtin $(abspath ...) helper to get absolute path

 - Add W=2 extra warning option to detect unused macros

 - Use more KCONFIG_CONFIG instead hard-coded .config

 - Fix bugs of tar*-pkg targets

* tag 'kbuild-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: buildtar: do not print successful message if tar returns error
  kbuild: buildtar: fix tar error when CONFIG_MODULES is disabled
  kbuild: Use KCONFIG_CONFIG in buildtar
  Kbuild: enable -Wunused-macros warning for "make W=2"
  kbuild: use $(abspath ...) instead of $(shell cd ... && /bin/pwd)

scripts/Makefile.extrawarn

@@ -37,6 +37,7 @@ warning-2 += $(call cc-option, -Wlogical-op)
 warning-2 += $(call cc-option, -Wmissing-field-initializers)
 warning-2 += $(call cc-option, -Wsign-compare)
 warning-2 += $(call cc-option, -Wmaybe-uninitialized)
+warning-2 += $(call cc-option, -Wunused-macros)
 
 warning-3 := -Wbad-function-cast
 warning-3 += -Wcast-qual

scripts/gdb/linux/Makefile

@@ -1,6 +1,6 @@
 always := gdb-scripts
 
-SRCTREE := $(shell cd $(srctree) && /bin/pwd)
+SRCTREE := $(abspath $(srctree))
 
 $(obj)/gdb-scripts:
 ifneq ($(KBUILD_SRC),)

scripts/package/buildtar

@@ -24,20 +24,19 @@ tarball="${objtree}/linux-${KERNELRELEASE}-${ARCH}.tar"
 #
 case "${1}" in
 	tar-pkg)
-		compress="cat"
-		file_ext=""
+		opts=
 		;;
 	targz-pkg)
-		compress="gzip"
-		file_ext=".gz"
+		opts=--gzip
+		tarball=${tarball}.gz
 		;;
 	tarbz2-pkg)
-		compress="bzip2"
-		file_ext=".bz2"
+		opts=--bzip2
+		tarball=${tarball}.bz2
 		;;
 	tarxz-pkg)
-		compress="xz"
-		file_ext=".xz"
+		opts=--xz
+		tarball=${tarball}.xz
 		;;
 	*)
 		echo "Unknown tarball target \"${1}\" requested, please add it to ${0}." >&2
@@ -51,13 +50,14 @@ esac
 #
 rm -rf -- "${tmpdir}"
 mkdir -p -- "${tmpdir}/boot"
-
+dirs=boot
 
 #
 # Try to install modules
 #
-if grep -q '^CONFIG_MODULES=y' "${objtree}/.config"; then
+if grep -q '^CONFIG_MODULES=y' "${KCONFIG_CONFIG}"; then
 	make ARCH="${ARCH}" O="${objtree}" KBUILD_SRC= INSTALL_MOD_PATH="${tmpdir}" modules_install
+	dirs="$dirs lib"
 fi
 
 
@@ -65,7 +65,7 @@ fi
 # Install basic kernel files
 #
 cp -v -- "${objtree}/System.map" "${tmpdir}/boot/System.map-${KERNELRELEASE}"
-cp -v -- "${objtree}/.config" "${tmpdir}/boot/config-${KERNELRELEASE}"
+cp -v -- "${KCONFIG_CONFIG}" "${tmpdir}/boot/config-${KERNELRELEASE}"
 cp -v -- "${objtree}/vmlinux" "${tmpdir}/boot/vmlinux-${KERNELRELEASE}"
 
 
@@ -124,14 +124,12 @@ esac
 #
 # Create the tarball
 #
-(
-	opts=
-	if tar --owner=root --group=root --help >/dev/null 2>&1; then
-		opts="--owner=root --group=root"
-	fi
-	tar cf - -C "$tmpdir" boot/ lib/ $opts | ${compress} > "${tarball}${file_ext}"
-)
+if tar --owner=root --group=root --help >/dev/null 2>&1; then
+	opts="$opts --owner=root --group=root"
+fi
 
-echo "Tarball successfully created in ${tarball}${file_ext}"
+tar cf $tarball -C $tmpdir $opts $dirs
+
+echo "Tarball successfully created in $tarball"
 
 exit 0