-dnl as-linux.m4 0.0.1
+dnl as-linux.m4 0.2.0
+
dnl autostars m4 macro for detecting a Linux source tree (or
dnl equivalent) for compiling modules.
-dnl
+
dnl David Schleef <ds@schleef.org>
dnl Frank Mori Hess <fmhess@users.sourceforge.net>
-dnl thomas@apestaart.org
-dnl
+dnl Thomas Vander Stichele <thomas@apestaart.org>
+
+dnl $Id$
+
dnl AS_LINUX()
dnl
-dnl this macro adds the options --with-linuxdir and --with-linux-config.
+dnl this macro adds the options
+dnl --with-linuxdir to specify a kernel build tree location
+dnl --with-linuxconfig to specify a kernel .config file
+dnl --with-kernel-release to specify an alternative uname -r
+dnl --with-machine to specify an alternative uname -m
+dnl --with-rpm-target to specify to match the given rpm --target option
+dnl --with-extraversion to specify an EXTRAVERSION override
+dnl --with-modulesdir to specify the base install location of modules
+dnl --with-modulesdeveldir to specify the base install location of build stuff
+
dnl this macro defines:
dnl LINUX_DIR
dnl The directory where the Linux source resides.
dnl Assembler used by Linux.
dnl LINUX_MODULE_EXT
dnl Module extension (.o or .ko)
-dnl
+dnl LINUX_MODPOST
+dnl path to modpost script
+dnl modulesdir
+dnl base install path for kernel modules
+dnl modulesdeveldir
+dnl base install path for kernel module development files
dnl
dnl End of search list.
+dnl main entry point
+dnl checks the version, and figures out all flags to use to make modules.
+AC_DEFUN([AS_LINUX],
+[
+ dnl check if user supplied a uname -r, and if not use the running one
+ AS_LINUX_KERNEL_RELEASE()
+ dnl check if user supplied a uname -m, and if not use the running one
+ AS_LINUX_MACHINE()
+ dnl check if the user supplied an rpm target arch
+ dnl override the LINUX_MACHINE value if he did
+ AS_LINUX_RPM_TARGET($LINUX_KERNEL_RELEASE)
+
+ dnl find the kernel source tree for the given uname -r
+ AS_LINUX_DIR($LINUX_KERNEL_RELEASE)
+ dnl check if user supplied an EXTRAVERSION, and if not get from uname -r
+ AS_LINUX_EXTRAVERSION($LINUX_KERNEL_RELEASE)
+ dnl check if user supplied a config file; if not, guess a good one
+ AS_LINUX_CONFIG($LINUX_DIR, $LINUX_KERNEL_RELEASE, $LINUX_MACHINE)
+ dnl check if we're building on pre-FC2 Red Hat/Fedora,
+ dnl and add some flags if we are
+ AS_CHECK_REDHAT_PRE_FC2()
+ dnl check for where to install modules
+ AS_LINUX_MODULESDIR($LINUX_KERNEL_RELEASE)
+ dnl check for where to install module development files
+ AS_LINUX_MODULESDEVELDIR($LINUX_DIR)
+ dnl check for the MAJOR/MINOR version of Linux
+ AS_LINUX_VERSION_MAJOR_MINOR($LINUX_DIR)
+
+ dnl now call the correct macro to get compiler flags
+ dnl the versioned AS_LINUX macros just use the global variables
+ dnl this could be cleaned up later on if we feel like it
+ case $LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR in
+ 2.6)
+ AS_LINUX_2_6()
+ ;;
+ 2.[[01234]])
+ AS_LINUX_2_4()
+ ;;
+ *)
+ AC_MSG_ERROR([Unknown Linux major.minor $LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR])
+ ;;
+ esac
+])
dnl check if we can find a source dir for the Linux kernel
AC_MSG_RESULT($result)
])
+dnl allow for specifying a kernel release (uname -r) to build for
+dnl use uname -r of running one if not specified
+dnl store result in LINUX_KERNEL_RELEASE
+AC_DEFUN([AS_LINUX_KERNEL_RELEASE],
+[
+ AC_ARG_WITH([kernel-release],
+ [AC_HELP_STRING([--with-kernel-release=RELEASE],
+ [specify the "uname -r"-value to build for])],
+ [LINUX_KERNEL_RELEASE="${withval}"],
+ [LINUX_KERNEL_RELEASE=`uname -r`])
+ if test "x$LINUX_KERNEL_RELEASE" = "xyes";
+ then
+ LINUX_KERNEL_RELEASE=`uname -r`
+ fi
+ AC_MSG_NOTICE([Using $LINUX_KERNEL_RELEASE as the uname -r value])
+])
+
+dnl allow for specifying a machine (uname -m) to build for
+dnl use uname -, of running one if not specified
+dnl store result in LINUX_MACHINE
+AC_DEFUN([AS_LINUX_MACHINE],
+[
+ AC_ARG_WITH([machine],
+ [AC_HELP_STRING([--with-machine=MACHINE],
+ [specify the "uname -m"-value to build for])],
+ [LINUX_MACHINE="${withval}"],
+ [LINUX_MACHINE=`uname -m`])
+ if test "x$LINUX_MACHINE" = "xyes";
+ then
+ LINUX_MACHINE=`uname -r`
+ fi
+ AC_MSG_NOTICE([Using $LINUX_MACHINE as the uname -m value])
+])
+dnl allow for specifying an rpm target arch
+dnl if none specified, try to guess one from running rpm querying for
+dnl the kernel with the uname -r
+dnl this is so configure without arguments works out of the box
+dnl FIXME: investigate if uname -p is a correct guess for this, and if
+dnl we should have a flag for specifying it instead
+
+dnl this macro possibly overrides LINUX_MACHINE
+
+dnl first argument is the kernel release building for
+AC_DEFUN([AS_LINUX_RPM_TARGET],
+[
+ RELEASE=$1
+ AC_ARG_WITH([rpm-target],
+ [AC_HELP_STRING([--with-rpm-target=TARGET],
+ [specify the target arch to build for])],
+ [LINUX_RPM_TARGET="${withval}"],
+ [LINUX_RPM_TARGET=])
+ if test "x$LINUX_RPM_TARGET" = "x"
+ then
+ dnl if we have rpm, try to guess the target of the kernel
+ dnl we want to build for using rpm
+ AC_PATH_PROG(RPM, rpm, yes, no)
+ if test "x$RPM" = "xyes"
+ then
+ if rpm -q kernel-$RELEASE > /dev/null
+ then
+ LINUX_RPM_TARGET=`rpm -q --queryformat %{arch} kernel-$RELEASE`
+ else
+ AC_MSG_NOTICE([Cannot guess target arch, consider setting it using --with-rpm-target])
+ fi
+ fi
+ fi
+
+ dnl now override LINUX_MACHINE if LINUX_RPM_TARGET is set
+ if test "x$LINUX_RPM_TARGET" != "x"
+ then
+ dnl override LINUX_MACHINE based on this
+ dnl FIXME: add other possible Red Hat/Fedora/rpm targets here
+ LINUX_MACHINE=
+ case "$LINUX_RPM_TARGET" in
+ i?86) LINUX_MACHINE=i386;;
+ athlon) LINUX_MACHINE=i386;;
+ x86_64) LINUX_MACHINE=x86_64;;
+ esac
+ if test "x$LINUX_MACHINE" = "x"
+ then
+ AC_MSG_ERROR(Could not guess uname -m value from target $LINUX_RPM_TARGET)
+ fi
+ fi
+])
+
+
+dnl allow for specifying an override for EXTRAVERSION
+dnl if none specified, make it from the passed-in KERNEL_RELEASE (uname -r)
+dnl resulting value is stored in LINUX_EXTRAVERSION
+dnl first argument is the uname -r string to use as a fallback
+AC_DEFUN([AS_LINUX_EXTRAVERSION],
+[
+ KERNEL_RELEASE=[$1]
+ dnl extract the default by getting everything after first -
+ LINUX_EXTRAVERSION="-`echo $KERNEL_RELEASE | cut -d- -f 2-`"
+ AC_ARG_WITH([extraversion],
+ [AC_HELP_STRING([--with-extraversion=FILE],
+ [specify override for kernel EXTRAVERSION])],
+ [LINUX_EXTRAVERSION="${withval}"],)
+])
+
+
dnl check if we can find a config file for the Linux kernel
-dnl defines CONFIG_FILE to the absolute location of a usable kernel source tree
-dnl uses LINUX_DIR to find either .config or decent configs in configs/
-AC_DEFUN([AS_CONFIG_FILE],
+dnl defines LINUX_CONFIG to the absolute location of a usable
+dnl kernel source config file
+
+dnl for rpm distros, it can try and guess the correct config file by
+dnl checking the global LINUX_RPM_TARGET variable set somewhere else
+dnl (FIXME: move this to an argument instead ?)
+
+dnl first argument is LINUX_DIR to check for possible configs
+dnl second argument is kernel-release (uname -r)
+dnl third argument is machine (uname -m)
+
+AC_DEFUN([AS_LINUX_CONFIG],
[
- AC_ARG_WITH([linux-config],
- [AC_HELP_STRING([--with-linux-config=FILE],
+ LINUX_DIR=[$1]
+ KERNEL_RELEASE=[$2]
+ MACHINE=[$3]
+ AC_ARG_WITH([linuxconfig],
+ [AC_HELP_STRING([--with-linuxconfig=FILE],
[specify path to Linux configuration file])],
- [CONFIG_FILE="${withval}"],
- [CONFIG_FILE=default])
+ [LINUX_CONFIG="${withval}"],
+ [LINUX_CONFIG=default])
- if test "${CONFIG_FILE}" != "default" ; then
- AS_TRY_CONFIG_FILE([${CONFIG_FILE}], , AC_MSG_ERROR([Linux config not found]) )
+ dnl if a file got specified, try it as a linux config file
+ if test "${LINUX_CONFIG}" != "default" ; then
+ AS_TRY_LINUX_CONFIG($LINUX_CONFIG, $MACHINE,
+ ,, AC_MSG_ERROR([Linux config not found]) )
fi
- dnl if default specified, first check for the regular .config file
+ dnl if no file specified, first check for the regular .config file
dnl in LINUX_DIR created by manual configuration
- if test "${CONFIG_FILE}" = "default" ; then
+ if test "${LINUX_CONFIG}" = "default" ; then
file="$LINUX_DIR/.config";
- AS_TRY_CONFIG_FILE([${file}], [CONFIG_FILE=${file}], )
+ AS_TRY_LINUX_CONFIG($file, $MACHINE,
+ [LINUX_CONFIG=${file}], )
fi
dnl second, try to guess what config file to use for the current kernel
- if test "${CONFIG_FILE}" = "default" ; then
+ dnl FIXME: the possible arch is from rpmbuild --target, and is
+ dnl different from the value of ARCH (Makefile) or MACHINE (uname -m)
+ dnl so we should have a redhat flag to specify the target to find
+ dnl the correct config file
+ if test "${LINUX_CONFIG}" = "default" && test "x$LINUX_RPM_TARGET" != "x"; then
dnl Red Hat stores configuration files for their built kernels
dnl named kernel-(version)-(arch)(extra).config
dnl where arch is athlon, i386, i586, i686, x86_64
dnl and (extra) is empty or -smp, -BOOT, -bigmem
dnl haven't seen combinations of extra yet as of FC1
- version=`uname -r | cut -d- -f1`
- machine=`uname -m`
+ KVERSION=`echo $KERNEL_RELEASE | cut -d- -f1`
extra=
- uname -r | grep smp && extra="-smp"
- uname -r | grep bigmem && extra="-bigmem"
- uname -r | grep BOOT && extra="-BOOT"
- file="$LINUX_DIR/configs/kernel-$version-$machine$extra.config"
- AS_TRY_CONFIG_FILE([${file}], [CONFIG_FILE=${file}], )
+ echo $KERNEL_RELEASE | grep smp && EXTRA="-smp"
+ echo $KERNEL_RELEASE | grep bigmem && EXTRA="-bigmem"
+ echo $KERNEL_RELEASE | grep BOOT && EXTRA="-BOOT"
+ file="$LINUX_DIR/configs/kernel-$KVERSION-$LINUX_RPM_TARGET$EXTRA.config"
+ AS_TRY_LINUX_CONFIG($file, $MACHINE,
+ [LINUX_CONFIG=${file}], )
fi
- if test "${CONFIG_FILE}" = "default" ; then
+ if test "${LINUX_CONFIG}" = "default" ; then
AC_MSG_ERROR([
The kernel source tree at ${LINUX_DIR} is not configured,
and no configuration files in config/ matching your kernel were found.
-Fix before continuing or specify a config file using --with-linux-config.])
+Fix before continuing or specify a config file using --with-configfile.])
fi
- AC_SUBST(CONFIG_FILE)
+ AC_SUBST(LINUX_CONFIG)
])
dnl check if the given candidate config file is usable
-AC_DEFUN([AS_TRY_CONFIG_FILE],
- [AC_MSG_CHECKING(for configuration in $1)
+dnl FIXME: it would be nice if it could check if it matches the
+dnl given machine (uname -m)
+AC_DEFUN([AS_TRY_LINUX_CONFIG],
+[
+ CFG=[$1]
+ MACHINE=[$2]
+ AC_MSG_CHECKING($CFG)
- if test -f "$1" ; then
+ if test -f "$CFG" ; then
result=yes
- $2
+ ifelse([$3], , :, [$3])
else
result="not found"
- $3
+ ifelse([$4], , :, [$4])
fi
-
AC_MSG_RESULT($result)
])
dnl check if RED_HAT_LINUX_KERNEL is defined
-dnl RH/Fedora defines this in linux/rhconfig.h, included from linux/version.h
+dnl pre-FC2 RH/Fedora defines this in linux/rhconfig.h
+dnl included from linux/version.h
dnl if this is present, a few extra defines need to be present to make sure
dnl symbol versioning is correct
dnl uses LINUX_DIR to find rhconfig.h
-AC_DEFUN([AS_CHECK_REDHAT],
+AC_DEFUN([AS_CHECK_REDHAT_PRE_FC2],
[
- AC_MSG_CHECKING(Red Hat/Fedora kernel)
+ AC_MSG_CHECKING(Pre-FC2 Red Hat/Fedora kernel)
HAVE_REDHAT_KERNEL=false
ac_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -I${LINUX_DIR}/include/linux"
HUGEMEM='0'
dnl get variables from the currently running kernel as default
- KERNEL_TYPE=`uname -r | sed 's_^.*\(smp\|enterprise\|bigmem\|hugemem\)$_-\1_;t;s_.*__;'`
+ KERNEL_TYPE=`uname -r | sed 's_^.*\(smp\|enterprise\|bigmem\|hugemem\)$_\1_;t;s_.*__;'`
KERNEL_RELEASE=`uname -r | sed 's|smp\|enterprise\|bigmem\|hugemem||g'`
KERNEL_ARCH=`uname -m`
AS_CHECK_LINUX_CONFIG_OPTION(CONFIG_MK7, KERNEL_ARCH=athlon)
dnl check the config file and override KERNEL_TYPE
- AS_CHECK_LINUX_CONFIG_OPTION(CONFIG_SMP, KERNEL_TYPE=-smp)
+ AS_CHECK_LINUX_CONFIG_OPTION(CONFIG_SMP, KERNEL_TYPE=smp)
dnl bigmem is also smp, so this check is done after smp to override
- AS_CHECK_LINUX_CONFIG_OPTION(CONFIG_HIGHMEM64G, KERNEL_TYPE=-bigmem)
+ AS_CHECK_LINUX_CONFIG_OPTION(CONFIG_HIGHMEM64G, KERNEL_TYPE=bigmem)
dnl FIXME: need to check hugemem and enterprise config files, which
dnl aren't provided in Fedora Core 1 !
case "$KERNEL_TYPE" in
- -smp) SMP='1';;
- -enterprise) ENTERPRISE='1';;
- -bigmem) BIGMEM='1';;
- -hugemem) HUGEMEM='1';;
+ smp) SMP='1';;
+ enterprise) ENTERPRISE='1';;
+ bigmem) BIGMEM='1';;
+ hugemem) HUGEMEM='1';;
*) UP='1';;
esac
REDHAT_CFLAGS="-D__MODULE_KERNEL_$KERNEL_ARCH=1"
REDHAT_CFLAGS="$REDHAT_CFLAGS -D__BOOT_KERNEL_SMP=$SMP"
REDHAT_CFLAGS="$REDHAT_CFLAGS -D__BOOT_KERNEL_BIGMEM=$BIGMEM"
REDHAT_CFLAGS="$REDHAT_CFLAGS -D__BOOT_KERNEL_HUGEMEM=$HUGEMEM"
-])
-dnl main entry point
-dnl checks the version, and figures out all flags to use to make modules.
-AC_DEFUN([AS_LINUX],
-[
- AS_LINUX_DIR()
- AS_CONFIG_FILE()
- AS_CHECK_REDHAT()
+ LINUX_REDHAT_CFLAGS="$REDHAT_CFLAGS"
- AC_MSG_CHECKING([Linux major/minor version])
+ AC_SUBST(LINUX_KERNEL_TYPE, "$KERNEL_TYPE")
+])
- if [[ ! -f "${LINUX_DIR}/include/linux/version.h" ]];then
- AC_MSG_ERROR([The header file include/linux/version.h does not exist.
-For 2.6 kernels, it can be generated by running 'make prepare' in
-the kernel source directory.])
+dnl add an argument to specify/override the module install path
+dnl if nothing specified, it will be /lib/modules/(kernelrel)
+AC_DEFUN([AS_LINUX_MODULESDIR],
+[
+ KERNEL_RELEASE=[$1]
+ AC_ARG_WITH([modulesdir],
+ [AC_HELP_STRING([--with-modulesdir=DIR],
+ [specify path to kernel-specific modules install directory])],
+ [MODULESDIR="${withval}"],
+ [MODULESDIR=default])
+
+ if test "${MODULESDIR}" = "default" ; then
+ MODULESDIR="/lib/modules/${KERNEL_RELEASE}"
fi
- dnl the next set of tests is for figuring out version major/minor
- dnl we make sure we have the right version.h by faking out CFLAGS
- ac_save_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS -I${LINUX_DIR}/include/linux"
- dnl make sure we find version.h and it contains LINUX_VERSION_CODE
- AC_COMPILE_IFELSE(AC_LANG_PROGRAM([
-#include "version.h"
-int code = LINUX_VERSION_CODE;
-]),
- :, AC_MSG_ERROR([${LINUX_DIR}/include/linux/version.h does not contain LINUX_VERSION_CODE]))
-
-
- dnl figure out the linux kernel version major and minor
- dnl using the LINUX_VERSION_CODE defined in include/linux/version.h
- AC_RUN_IFELSE(AC_LANG_PROGRAM([
-#include "version.h"
-#define KERNEL_VERSION_MAJOR(code) ((code) >> 16)
-],[
- return KERNEL_VERSION_MAJOR(LINUX_VERSION_CODE);
-]),
- LINUX_VERSION_MAJOR=0,
- LINUX_VERSION_MAJOR=$?)
- AC_RUN_IFELSE(AC_LANG_PROGRAM([
-#include "version.h"
-#define KERNEL_VERSION_MINOR(code) (((code) >> 8) & 0xff)
-],[
- return KERNEL_VERSION_MINOR(LINUX_VERSION_CODE);
-]),
- LINUX_VERSION_MINOR=0,
- LINUX_VERSION_MINOR=$?)
- AC_MSG_RESULT($LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR)
- dnl restore CFLAGS
- CFLAGS="$ac_save_CFLAGS"
+ dnl make it available to Makefiles so it can be used in ...dir
+ AC_SUBST(modulesdir, $MODULESDIR)
+ AC_MSG_NOTICE([Putting kernel modules under ${MODULESDIR}])
+])
- case $LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR in
- 2.6)
- AS_LINUX_2_6()
- ;;
- 2.[[01234]])
- AS_LINUX_2_4()
- ;;
- *)
- AC_MSG_ERROR([Unknown Linux major.minor $LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR])
- ;;
- esac
+dnl add an argument to specify/override the module devel install path
+dnl if nothing specified, it will be the passed in LINUXDIR)
+AC_DEFUN([AS_LINUX_MODULESDEVELDIR],
+[
+ LINUXDIR=[$1]
+ AC_ARG_WITH([modulesdeveldir],
+ [AC_HELP_STRING([--with-modulesdeveldir=DIR],
+ [specify path to kernel-specific module development install directory])],
+ [MODULESDEVELDIR="${withval}"],
+ [MODULESDEVELDIR=default])
+
+ if test "${MODULESDEVELDIR}" = "default" ; then
+ MODULESDEVELDIR="${LINUXDIR}"
+ fi
+ dnl make it available to Makefiles so it can be used in ...dir
+ AC_SUBST(modulesdeveldir, $MODULESDEVELDIR)
+ AC_MSG_NOTICE([Putting kernel module development files under ${MODULESDEVELDIR}])
])
AC_DEFUN([AS_LINUX_2_6],
.PHONY: flags
flags:
echo LINUX_ARCH=\"\$(ARCH)\" >>\$(obj)/flags
- echo LINUX_AFLAGS=\"\$(AFLAGS)\" | sed 's_Iinclude_I"\$(LINUXDIR)/include"_g'>>\$(obj)/flags
+ echo LINUX_AFLAGS=\"\$(AFLAGS)\" | sed 's,include,"\$(LINUXDIR)/include",g'>>\$(obj)/flags
echo LINUX_LDFLAGS=\"\" >>\$(obj)/flags
echo LINUX_ARFLAGS=\"\$(ARFLAGS)\" >>\$(obj)/flags
echo LINUX_CROSS_COMPILE=\"\$(CROSS_COMPILE)\" >>\$(obj)/flags
echo LINUX_KERNELRELEASE=\"\$(KERNELRELEASE)\" >>\$(obj)/flags
- echo LINUX_CFLAGS=\"\$(CFLAGS)\" | sed 's_Iinclude_I"\$(LINUXDIR)/include"_g'>>\$(obj)/flags
+ echo LINUX_CFLAGS=\"\$(CFLAGS) \$(CPPFLAGS)\" | sed 's,Iinclude,I\$(LINUXDIR)/include,g' >>\$(obj)/flags
echo LINUX_CFLAGS_MODULE=\"\$(CFLAGS_MODULE)\" >>\$(obj)/flags
echo LINUX_CC=\"\$(CC)\" >>\$(obj)/flags
echo LINUX_LD=\"\$(LD) \$(LDFLAGS) \$(LDFLAGS_MODULE)\" >>\$(obj)/flags
LINUX_MODULE_EXT=".ko"
LINUX_CFLAGS="$LINUX_CFLAGS $LINUX_CFLAGS_MODULE"
+ LINUX_MODPOST="$LINUX_DIR/scripts/modpost"
AC_SUBST(LINUX_ARCH)
AC_SUBST(LINUX_AFLAGS)
AC_SUBST(LINUX_LD)
AC_SUBST(LINUX_AS)
AC_SUBST(LINUX_MODULE_EXT)
+ AC_SUBST(LINUX_MODPOST)
- AC_MSG_RESULT([ok])
+ AC_MSG_RESULT([$LINUX_CFLAGS])
])
[
AC_MSG_CHECKING([Linux config option $1])
- if grep '^$1=y$' ${CONFIG_FILE} >/dev/null 2>/dev/null; then
+ if grep '^$1=y$' ${LINUX_CONFIG} >/dev/null 2>/dev/null; then
result=yes
$2
- else if grep '^$1=m$' ${CONFIG_FILE} >/dev/null 2>/dev/null; then
+ else if grep '^$1=m$' ${LINUX_CONFIG} >/dev/null 2>/dev/null; then
result=module
$3
else
AM_CONDITIONAL([$1],[test "${$1}" = yes -o "${$1}" = module])
])
+dnl check for the major/minor version of the Linux source by checking
+dnl the headers
+dnl first argument is the linux directory
+dnl sets LINUX_VERSION_MAJOR and LINUX_VERSION_MINOR
+AC_DEFUN([AS_LINUX_VERSION_MAJOR_MINOR],
+[
+ LINUX_DIR=[$1]
+ AC_MSG_CHECKING([Linux major/minor version])
+
+ if [[ ! -f "${LINUX_DIR}/include/linux/version.h" ]];then
+ AC_MSG_ERROR([The header file include/linux/version.h does not exist.
+For 2.6 kernels, it can be generated by running 'make prepare' in
+the kernel source directory.])
+ fi
+ dnl the next set of tests is for figuring out version major/minor
+ dnl we make sure we have the right version.h by faking out CFLAGS
+ dnl since we want to avoid including linux/version.h and acidentally
+ dnl pick up /usr/include/linux
+ dnl we still add ${LINUX_DIR}/include so the Red Hat version can pick
+ dnl up linux/rhversion.h
+ ac_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -I${LINUX_DIR}/include/linux -I${LINUX_DIR}/include"
+ dnl make sure we find version.h and it contains LINUX_VERSION_CODE
+ AC_COMPILE_IFELSE(AC_LANG_PROGRAM([
+#include "version.h"
+int code = LINUX_VERSION_CODE;
+]),
+ :, AC_MSG_ERROR([${LINUX_DIR}/include/linux/version.h does not contain LINUX_VERSION_CODE]))
+
+
+ dnl figure out the linux kernel version major and minor
+ dnl using the LINUX_VERSION_CODE defined in include/linux/version.h
+ AC_RUN_IFELSE(AC_LANG_PROGRAM([
+#include "version.h"
+#define KERNEL_VERSION_MAJOR(code) ((code) >> 16)
+],[
+ return KERNEL_VERSION_MAJOR(LINUX_VERSION_CODE);
+]),
+ LINUX_VERSION_MAJOR=0,
+ LINUX_VERSION_MAJOR=$?)
+ AC_RUN_IFELSE(AC_LANG_PROGRAM([
+#include "version.h"
+#define KERNEL_VERSION_MINOR(code) (((code) >> 8) % (2 << 8))
+],[
+ return KERNEL_VERSION_MINOR(LINUX_VERSION_CODE);
+]),
+ LINUX_VERSION_MINOR=0,
+ LINUX_VERSION_MINOR=$?)
+ AC_MSG_RESULT($LINUX_VERSION_MAJOR.$LINUX_VERSION_MINOR)
+ dnl restore CFLAGS
+ CFLAGS="$ac_save_CFLAGS"
+])
+
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