[LTP] [PATCH] configure: add configure checks to compile kernel modules

[Alexey K. <ale...@or...>]

There're new configure options added to tune modules building process.
New m4 function tries to determine if kernel-devel package is available
and sets makefile's variables (WITH_MODULES, ...) accordingly.

Signed-off-by: Alexey Kodanev <ale...@or...>
---
 configure.ac                 |    1 +
 include/mk/config.mk.default |    6 +++
 include/mk/config.mk.in      |    6 +++
 m4/ltp-kernel_devel.m4       |   72 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 85 insertions(+), 0 deletions(-)
 create mode 100644 m4/ltp-kernel_devel.m4

diff --git a/configure.ac b/configure.ac
index f217f50..f0fc6b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -167,5 +167,6 @@ LTP_CHECK_MADVISE
 LTP_CHECK_ACL_SUPPORT
 LTP_CHECK_FS_IOC_FLAGS
 LTP_CHECK_MREMAP_FIXED
+LTP_CHECK_KERNEL_DEVEL
 
 AC_OUTPUT
diff --git a/include/mk/config.mk.default b/include/mk/config.mk.default
index bd364a6..558e856 100644
--- a/include/mk/config.mk.default
+++ b/include/mk/config.mk.default
@@ -73,4 +73,10 @@ LDFLAGS			+= $(WLDFLAGS)
 CFLAGS			+= $(DEBUG_CFLAGS) $(OPT_CFLAGS) $(WCFLAGS)
 CXXFLAGS		+= $(DEBUG_CXXFLAGS) $(OPT_CXXFLAGS) $(WCXXFLAGS)
 
+KBUILD_RELEASE		:=
+KBUILD_DIR		:=
+KBUILD_VERSION		:=
+KBUILD_PATCHLEVEL	:=
+WITH_MODULES		:= no
+
 export datarootdir includedir libdir mandir prefix
diff --git a/include/mk/config.mk.in b/include/mk/config.mk.in
index b835c86..d38e5f1 100644
--- a/include/mk/config.mk.in
+++ b/include/mk/config.mk.in
@@ -75,6 +75,12 @@ LDFLAGS			+= $(WLDFLAGS)
 CFLAGS			+= $(DEBUG_CFLAGS) $(OPT_CFLAGS) $(WCFLAGS)
 CXXFLAGS		+= $(DEBUG_CXXFLAGS) $(OPT_CXXFLAGS) $(WCXXFLAGS)
 
+KBUILD_RELEASE		:= @KBUILD_RELEASE@
+KBUILD_DIR		:= @KBUILD_DIR@
+KBUILD_VERSION		:= @KBUILD_VERSION@
+KBUILD_PATCHLEVEL	:= @KBUILD_PATCHLEVEL@
+WITH_MODULES		:= @WITH_MODULES@
+
 ifeq ($(strip $(prefix)),)
 $(error you are using $$(prefix) incorrectly -- set it to $(abs_top_srcdir) if you want to build in the source tree)
 endif
diff --git a/m4/ltp-kernel_devel.m4 b/m4/ltp-kernel_devel.m4
new file mode 100644
index 0000000..a1fa8ec
--- /dev/null
+++ b/m4/ltp-kernel_devel.m4
@@ -0,0 +1,72 @@
+dnl Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
+dnl
+dnl This program is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU General Public License as
+dnl published by the Free Software Foundation.
+dnl
+dnl This program is distributed in the hope that it would be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write the Free Software Foundation,
+dnl Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+dnl
+dnl Author: Alexey Kodanev <ale...@or...>
+dnl
+
+dnl
+dnl LTP_CHECK_KERNEL_DEVEL
+dnl ----------------------------
+dnl Building kernel modules
+dnl requires kernel-devel installed
+dnl
+
+AC_DEFUN([LTP_CHECK_KERNEL_DEVEL],
+[
+AC_ARG_WITH(
+	    [kbuild-release],
+	    [AC_HELP_STRING([--with-kbuild-release=RELEASE],
+			    [specify the kernel release to build modules for])],
+	    [KBUILD_RELEASE="${withval}"],
+	    [KBUILD_RELEASE=`uname -r`])
+
+AC_SUBST(KBUILD_RELEASE)
+
+AC_ARG_WITH([kbuild-dir],
+	    [AC_HELP_STRING([--with-kbuild-dir=DIR],
+			    [specify path to kernel-devel directory])],
+	    [KBUILD_DIR="${withval}"],
+	    [KBUILD_DIR="/lib/modules/$KBUILD_RELEASE/build"])
+
+AC_SUBST(KBUILD_DIR)
+
+if test -f "$KBUILD_DIR/Makefile"; then
+
+	KBUILD_VERSION=`grep -o '^VERSION = [[0-9]]*' -m 1 \
+"${KBUILD_DIR}/Makefile" | grep -o '[[0-9]]*'`
+
+	KBUILD_PATCHLEVEL=`grep -o "^PATCHLEVEL = [[0-9]]*" -m 1 \
+"${KBUILD_DIR}/Makefile" | grep -o "[[0-9]]*"`
+
+	if [[ -n "$KBUILD_VERSION" ]] && [[ -n "$KBUILD_PATCHLEVEL" ]]; then
+		WITH_MODULES="yes"
+	fi
+else
+	WITH_MODULES="no"
+fi
+
+AC_MSG_RESULT([checking for kernel-devel... $WITH_MODULES])
+
+AC_ARG_WITH(
+	    [modules],
+	    [AC_HELP_STRING([--without-modules],
+			    [disable auto-building kernel modules])],
+			    [WITH_MODULES="no"],
+			    [])
+
+AC_SUBST(KBUILD_VERSION)
+AC_SUBST(KBUILD_PATCHLEVEL)
+AC_SUBST(WITH_MODULES)
+])
-- 
1.7.1