[mirror_zfs.git] / config / kernel.m4

dnl #
dnl # Default ZFS kernel configuration 
dnl #
AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	ZFS_AC_KERNEL
	ZFS_AC_SPL
	ZFS_AC_KERNEL_CONFIG
	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	ZFS_AC_KERNEL_TYPE_FMODE_T
	ZFS_AC_KERNEL_KOBJ_NAME_LEN
	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
	ZFS_AC_KERNEL_BIO_RW_SYNCIO
	ZFS_AC_KERNEL_BLK_END_REQUEST
	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	ZFS_AC_KERNEL_BLK_RQ_BYTES
	ZFS_AC_KERNEL_BLK_RQ_POS
	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	ZFS_AC_KERNEL_GET_DISK_RO
	ZFS_AC_KERNEL_RQ_IS_SYNC
	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT

	if test "$LINUX_OBJ" != "$LINUX"; then
		KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	fi
	AC_SUBST(KERNELMAKE_PARAMS)


	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
	dnl # compiler options are added by the kernel build system.
	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""

	AC_SUBST(KERNELCPPFLAGS)
])

dnl #
dnl # Detect name used for Module.symvers file in kernel
dnl #
AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	modpost=$LINUX/scripts/Makefile.modpost
	AC_MSG_CHECKING([kernel file name for module symbols])
	if test -f "$modpost"; then
		if grep -q Modules.symvers $modpost; then
			LINUX_SYMBOLS=Modules.symvers
		else
			LINUX_SYMBOLS=Module.symvers
		fi
	else
		LINUX_SYMBOLS=NONE
	fi
	AC_MSG_RESULT($LINUX_SYMBOLS)
	AC_SUBST(LINUX_SYMBOLS)
])

dnl #
dnl # Detect the kernel to be built against
dnl #
AC_DEFUN([ZFS_AC_KERNEL], [
	AC_ARG_WITH([linux],
		AS_HELP_STRING([--with-linux=PATH],
		[Path to kernel source]),
		[kernelsrc="$withval"])

	AC_ARG_WITH(linux-obj,
		AS_HELP_STRING([--with-linux-obj=PATH],
		[Path to kernel build objects]),
		[kernelbuild="$withval"])

	AC_MSG_CHECKING([kernel source directory])
	if test -z "$kernelsrc"; then
		headersdir="/lib/modules/$(uname -r)/build"
		if test -e "$headersdir"; then
			sourcelink=$(readlink -f "$headersdir")
		else
			sourcelink=$(ls -1d /usr/src/kernels/* \
				     /usr/src/linux-* \
			             2>/dev/null | grep -v obj | tail -1)
		fi

		if test -n "$sourcelink" && test -e ${sourcelink}; then
			kernelsrc=`readlink -f ${sourcelink}`
		else
			AC_MSG_RESULT([Not found])
			AC_MSG_ERROR([
	*** Please make sure the kernel devel package for your distribution
	*** is installed then try again.  If that fails you can specify the
	*** location of the kernel source with the '--with-linux=PATH' option.])
		fi
	else
		if test "$kernelsrc" = "NONE"; then
			kernsrcver=NONE
		fi
	fi

	AC_MSG_RESULT([$kernelsrc])
	AC_MSG_CHECKING([kernel build directory])
	if test -z "$kernelbuild"; then
		if test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
			kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
		elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
		        kernelbuild=${kernelsrc}-obj/${target_cpu}/default
		elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
			kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
		else
			kernelbuild=${kernelsrc}
		fi
	fi
	AC_MSG_RESULT([$kernelbuild])

	AC_MSG_CHECKING([kernel source version])
	utsrelease1=$kernelbuild/include/linux/version.h
	utsrelease2=$kernelbuild/include/linux/utsrelease.h
	utsrelease3=$kernelbuild/include/generated/utsrelease.h
	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
		utsrelease=linux/version.h
	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
		utsrelease=linux/utsrelease.h
	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
		utsrelease=generated/utsrelease.h
	fi

	if test "$utsrelease"; then
		kernsrcver=`(echo "#include <$utsrelease>";
		             echo "kernsrcver=UTS_RELEASE") |
		             cpp -I $kernelbuild/include |
		             grep "^kernsrcver=" | cut -d \" -f 2`

		if test -z "$kernsrcver"; then
			AC_MSG_RESULT([Not found])
			AC_MSG_ERROR([*** Cannot determine kernel version.])
		fi
	else
		AC_MSG_RESULT([Not found])
		AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
	fi

	AC_MSG_RESULT([$kernsrcver])

	LINUX=${kernelsrc}
	LINUX_OBJ=${kernelbuild}
	LINUX_VERSION=${kernsrcver}

	AC_SUBST(LINUX)
	AC_SUBST(LINUX_OBJ)
	AC_SUBST(LINUX_VERSION)

	ZFS_AC_MODULE_SYMVERS
])

dnl #
dnl # Detect name used for the additional SPL Module.symvers file.  If one
dnl # does not exist this is likely because the SPL has been configured
dnl # but not built.  To allow recursive builds a good guess is made as to
dnl # what this file will be named based on what it is named in the kernel
dnl # build products.  This file will first be used at link time so if
dnl # the guess is wrong the build will fail then.  This unfortunately
dnl # means the ZFS package does not contain a reliable mechanism to
dnl # detect symbols exported by the SPL at configure time.
dnl #
AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
	AC_MSG_CHECKING([spl file name for module symbols])
	if test -r $SPL_OBJ/Module.symvers; then
		SPL_SYMBOLS=Module.symvers
	elif test -r $SPL_OBJ/Modules.symvers; then
		SPL_SYMBOLS=Modules.symvers
	elif test -r $SPL_OBJ/module/Module.symvers; then
		SPL_SYMBOLS=Module.symvers
	elif test -r $SPL_OBJ/module/Modules.symvers; then
		SPL_SYMBOLS=Modules.symvers
	else
		SPL_SYMBOLS=$LINUX_SYMBOLS
	fi

	AC_MSG_RESULT([$SPL_SYMBOLS])
	AC_SUBST(SPL_SYMBOLS)
])

dnl #
dnl # Detect the SPL module to be built against
dnl #
AC_DEFUN([ZFS_AC_SPL], [
	AC_ARG_WITH([spl],
		AS_HELP_STRING([--with-spl=PATH],
		[Path to spl source]),
		[splsrc="$withval"])

	AC_ARG_WITH([spl-obj],
		AS_HELP_STRING([--with-spl-obj=PATH],
		[Path to spl build objects]),
		[splbuild="$withval"])


	AC_MSG_CHECKING([spl source directory])
	if test -z "$splsrc"; then
		sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
		            2>/dev/null | tail -1`

		if test -z "$sourcelink" || test ! -e $sourcelink; then
			sourcelink=../spl
		fi

		if test -e $sourcelink; then
			splsrc=`readlink -f ${sourcelink}`
		else
			AC_MSG_RESULT([Not found])
			AC_MSG_ERROR([
	*** Please make sure the spl devel package for your distribution
	*** is installed then try again.  If that fails you can specify the
	*** location of the spl source with the '--with-spl=PATH' option.])
		fi
	else
		if test "$splsrc" = "NONE"; then
			splbuild=NONE
			splsrcver=NONE
		fi
	fi

	AC_MSG_RESULT([$splsrc])
	AC_MSG_CHECKING([spl build directory])
	if test -z "$splbuild"; then
		splbuild=${splsrc}
	fi
	AC_MSG_RESULT([$splbuild])

	AC_MSG_CHECKING([spl source version])
	if test -r $splbuild/spl_config.h &&
		fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then

		splsrcver=`(echo "#include <spl_config.h>";
		            echo "splsrcver=SPL_META_VERSION") |
		            cpp -I $splbuild |
		            grep "^splsrcver=" | cut -d \" -f 2`
	fi

	if test -z "$splsrcver"; then
		AC_MSG_RESULT([Not found])
		AC_MSG_ERROR([
		*** Cannot determine the version of the spl source.
		*** Please prepare the spl source before running this script])
	fi

	AC_MSG_RESULT([$splsrcver])

	SPL=${splsrc}
	SPL_OBJ=${splbuild}
	SPL_VERSION=${splsrcver}

	AC_SUBST(SPL)
	AC_SUBST(SPL_OBJ)
	AC_SUBST(SPL_VERSION)

	ZFS_AC_SPL_MODULE_SYMVERS
])

dnl #
dnl # There are certain kernel build options which when enabled are
dnl # completely incompatible with non GPL kernel modules.  It is best
dnl # to detect these at configure time and fail with a clear error
dnl # rather than build everything and fail during linking.
dnl #
dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [

	if test "$ZFS_META_LICENSE" = CDDL; then
		ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
		AC_MSG_ERROR([
		*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
		*** incompatible with the CDDL license.  You must rebuild
		*** your kernel without this option.]), [])
	fi

	if test "$ZFS_META_LICENSE" = GPL; then
		AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
			[Define to 1 if licensed under the GPL])
	fi
])

dnl #
dnl # ZFS_LINUX_CONFTEST
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST], [
cat confdefs.h - <<_ACEOF >conftest.c
$1
_ACEOF
])

dnl #
dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
dnl #
m4_define([ZFS_LANG_PROGRAM], [
$1
int
main (void)
{
dnl Do *not* indent the following line: there may be CPP directives.
dnl Don't move the `;' right after for the same reason.
$2
  ;
  return 0;
}
])

dnl #
dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
dnl #
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
	rm -Rf build && mkdir -p build
	echo "obj-m := conftest.o" >build/Makefile
	AS_IF(
		[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
		[$4],
		[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
	)
	rm -Rf build
])

dnl #
dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
dnl #
AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
	[ZFS_LINUX_COMPILE_IFELSE(
	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
	[modules],
	[test -s build/conftest.o],
	[$3], [$4])
])

dnl #
dnl # ZFS_LINUX_CONFIG
dnl #
AC_DEFUN([ZFS_LINUX_CONFIG],
	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
	ZFS_LINUX_TRY_COMPILE([
		#ifndef AUTOCONF_INCLUDED
		#include <linux/config.h>
		#endif
	],[
		#ifndef CONFIG_$1
		#error CONFIG_$1 not #defined
		#endif
	],[
		AC_MSG_RESULT([yes])
		$2
	],[
		AC_MSG_RESULT([no])
		$3
	])
])

dnl #
dnl # ZFS_CHECK_SYMBOL_EXPORT
dnl # check symbol exported or not
dnl #
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
	[AC_MSG_CHECKING([whether symbol $1 is exported])
	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
		$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
	rc=$?
	if test $rc -ne 0; then
		export=0
		for file in $2; do
			grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
			rc=$?
		        if test $rc -eq 0; then
		                export=1
		                break;
		        fi
		done
		if test $export -eq 0; then
			AC_MSG_RESULT([no])
			$4
		else
			AC_MSG_RESULT([yes])
			$3
		fi
	else
		AC_MSG_RESULT([yes])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
	11	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	12	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	13	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	14	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
	15	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
	16	ZFS_AC_KERNEL_BIO_RW_SYNCIO
	17	ZFS_AC_KERNEL_BLK_END_REQUEST
	18	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	19	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	20	ZFS_AC_KERNEL_BLK_RQ_BYTES
	21	ZFS_AC_KERNEL_BLK_RQ_POS
	22	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	23	ZFS_AC_KERNEL_GET_DISK_RO
	24	ZFS_AC_KERNEL_RQ_IS_SYNC
	25	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
	26
6283f55e BB	27	if test "$LINUX_OBJ" != "$LINUX"; then
	28	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	29	fi
	30	AC_SUBST(KERNELMAKE_PARAMS)
	31
	32
c9c0d073 BB	33	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
	34	dnl # compiler options are added by the kernel build system.
	35	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
	36	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
c9c0d073	37
c9c0d073 BB	38	AC_SUBST(KERNELCPPFLAGS)
	39	])
	40
	41	dnl #
	42	dnl # Detect name used for Module.symvers file in kernel
	43	dnl #
	44	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	45	modpost=$LINUX/scripts/Makefile.modpost
	46	AC_MSG_CHECKING([kernel file name for module symbols])
	47	if test -f "$modpost"; then
	48	if grep -q Modules.symvers $modpost; then
	49	LINUX_SYMBOLS=Modules.symvers
	50	else
	51	LINUX_SYMBOLS=Module.symvers
	52	fi
	53	else
	54	LINUX_SYMBOLS=NONE
	55	fi
	56	AC_MSG_RESULT($LINUX_SYMBOLS)
	57	AC_SUBST(LINUX_SYMBOLS)
	58	])
	59
	60	dnl #
	61	dnl # Detect the kernel to be built against
	62	dnl #
	63	AC_DEFUN([ZFS_AC_KERNEL], [
	64	AC_ARG_WITH([linux],
	65	AS_HELP_STRING([--with-linux=PATH],
	66	[Path to kernel source]),
	67	[kernelsrc="$withval"])
	68
	69	AC_ARG_WITH(linux-obj,
	70	AS_HELP_STRING([--with-linux-obj=PATH],
	71	[Path to kernel build objects]),
	72	[kernelbuild="$withval"])
	73
	74	AC_MSG_CHECKING([kernel source directory])
	75	if test -z "$kernelsrc"; then
	76	headersdir="/lib/modules/$(uname -r)/build"
	77	if test -e "$headersdir"; then
	78	sourcelink=$(readlink -f "$headersdir")
	79	else
	80	sourcelink=$(ls -1d /usr/src/kernels/* \
	81	/usr/src/linux-* \
	82	2>/dev/null \| grep -v obj \| tail -1)
	83	fi
	84
	85	if test -n "$sourcelink" && test -e ${sourcelink}; then
	86	kernelsrc=`readlink -f ${sourcelink}`
	87	else
	88	AC_MSG_RESULT([Not found])
	89	AC_MSG_ERROR([
	90	*** Please make sure the kernel devel package for your distribution
	91	*** is installed then try again. If that fails you can specify the
	92	*** location of the kernel source with the '--with-linux=PATH' option.])
	93	fi
	94	else
	95	if test "$kernelsrc" = "NONE"; then
	96	kernsrcver=NONE
	97	fi
	98	fi
	99
	100	AC_MSG_RESULT([$kernelsrc])
	101	AC_MSG_CHECKING([kernel build directory])
102	if test -z "$kernelbuild"; then
103	if test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
104	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
105	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
106	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
107	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
108	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
109	else
110	kernelbuild=${kernelsrc}
111	fi
112	fi
113	AC_MSG_RESULT([$kernelbuild])
114
115	AC_MSG_CHECKING([kernel source version])
116	utsrelease1=$kernelbuild/include/linux/version.h
117	utsrelease2=$kernelbuild/include/linux/utsrelease.h
118	utsrelease3=$kernelbuild/include/generated/utsrelease.h
119	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
120	utsrelease=linux/version.h
121	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
122	utsrelease=linux/utsrelease.h
123	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
124	utsrelease=generated/utsrelease.h
125	fi
126
127	if test "$utsrelease"; then
128	kernsrcver=`(echo "#include <$utsrelease>";
129	echo "kernsrcver=UTS_RELEASE") \|
130	cpp -I $kernelbuild/include \|
131	grep "^kernsrcver=" \| cut -d \" -f 2`
132
133	if test -z "$kernsrcver"; then
134	AC_MSG_RESULT([Not found])
135	AC_MSG_ERROR([*** Cannot determine kernel version.])
136	fi
137	else
138	AC_MSG_RESULT([Not found])
139	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
140	fi
141
142	AC_MSG_RESULT([$kernsrcver])
143
144	LINUX=${kernelsrc}
145	LINUX_OBJ=${kernelbuild}
146	LINUX_VERSION=${kernsrcver}
147
148	AC_SUBST(LINUX)
149	AC_SUBST(LINUX_OBJ)
150	AC_SUBST(LINUX_VERSION)
151
152	ZFS_AC_MODULE_SYMVERS
153	])
154
155	dnl #
156	dnl # Detect name used for the additional SPL Module.symvers file. If one
157	dnl # does not exist this is likely because the SPL has been configured
158	dnl # but not built. To allow recursive builds a good guess is made as to
159	dnl # what this file will be named based on what it is named in the kernel
160	dnl # build products. This file will first be used at link time so if
161	dnl # the guess is wrong the build will fail then. This unfortunately
162	dnl # means the ZFS package does not contain a reliable mechanism to
163	dnl # detect symbols exported by the SPL at configure time.
164	dnl #
165	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
166	AC_MSG_CHECKING([spl file name for module symbols])
167	if test -r $SPL_OBJ/Module.symvers; then
168	SPL_SYMBOLS=Module.symvers
169	elif test -r $SPL_OBJ/Modules.symvers; then
170	SPL_SYMBOLS=Modules.symvers
6283f55e BB	171	elif test -r $SPL_OBJ/module/Module.symvers; then
	172	SPL_SYMBOLS=Module.symvers
	173	elif test -r $SPL_OBJ/module/Modules.symvers; then
	174	SPL_SYMBOLS=Modules.symvers
c9c0d073 BB	175	else
	176	SPL_SYMBOLS=$LINUX_SYMBOLS
	177	fi
	178
	179	AC_MSG_RESULT([$SPL_SYMBOLS])
	180	AC_SUBST(SPL_SYMBOLS)
	181	])
	182
	183	dnl #
	184	dnl # Detect the SPL module to be built against
	185	dnl #
	186	AC_DEFUN([ZFS_AC_SPL], [
	187	AC_ARG_WITH([spl],
	188	AS_HELP_STRING([--with-spl=PATH],
	189	[Path to spl source]),
	190	[splsrc="$withval"])
	191
	192	AC_ARG_WITH([spl-obj],
	193	AS_HELP_STRING([--with-spl-obj=PATH],
	194	[Path to spl build objects]),
	195	[splbuild="$withval"])
	196
	197
	198	AC_MSG_CHECKING([spl source directory])
	199	if test -z "$splsrc"; then
	200	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
	201	2>/dev/null \| tail -1`
	202
	203	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
	204	sourcelink=../spl
	205	fi
	206
	207	if test -e $sourcelink; then
	208	splsrc=`readlink -f ${sourcelink}`
	209	else
	210	AC_MSG_RESULT([Not found])
	211	AC_MSG_ERROR([
	212	*** Please make sure the spl devel package for your distribution
	213	*** is installed then try again. If that fails you can specify the
	214	*** location of the spl source with the '--with-spl=PATH' option.])
	215	fi
	216	else
	217	if test "$splsrc" = "NONE"; then
	218	splbuild=NONE
	219	splsrcver=NONE
	220	fi
	221	fi
	222
	223	AC_MSG_RESULT([$splsrc])
	224	AC_MSG_CHECKING([spl build directory])
	225	if test -z "$splbuild"; then
6283f55e	226	splbuild=${splsrc}
c9c0d073 BB	227	fi
	228	AC_MSG_RESULT([$splbuild])
	229
	230	AC_MSG_CHECKING([spl source version])
5e612145 BB	231	if test -r $splbuild/spl_config.h &&
5e612145 BB	232	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	233
	234	splsrcver=`(echo "#include <spl_config.h>";
	235	echo "splsrcver=SPL_META_VERSION") \|
5e612145	236	cpp -I $splbuild \|
c9c0d073 BB	237	grep "^splsrcver=" \| cut -d \" -f 2`
	238	fi
	239
	240	if test -z "$splsrcver"; then
	241	AC_MSG_RESULT([Not found])
	242	AC_MSG_ERROR([
	243	*** Cannot determine the version of the spl source.
	244	*** Please prepare the spl source before running this script])
	245	fi
	246
	247	AC_MSG_RESULT([$splsrcver])
	248
	249	SPL=${splsrc}
	250	SPL_OBJ=${splbuild}
	251	SPL_VERSION=${splsrcver}
	252
	253	AC_SUBST(SPL)
	254	AC_SUBST(SPL_OBJ)
	255	AC_SUBST(SPL_VERSION)
	256
	257	ZFS_AC_SPL_MODULE_SYMVERS
	258	])
	259
	260	dnl #
	261	dnl # There are certain kernel build options which when enabled are
	262	dnl # completely incompatible with non GPL kernel modules. It is best
	263	dnl # to detect these at configure time and fail with a clear error
	264	dnl # rather than build everything and fail during linking.
	265	dnl #
	266	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	267	dnl #
	268	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	269
	270	if test "$ZFS_META_LICENSE" = CDDL; then
	271	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	272	AC_MSG_ERROR([
	273	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	274	*** incompatible with the CDDL license. You must rebuild
	275	*** your kernel without this option.]), [])
	276	fi
	277
	278	if test "$ZFS_META_LICENSE" = GPL; then
	279	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	280	[Define to 1 if licensed under the GPL])
	281	fi
	282	])
	283
	284	dnl #
	285	dnl # ZFS_LINUX_CONFTEST
	286	dnl #
	287	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	288	cat confdefs.h - <<_ACEOF >conftest.c
	289	$1
	290	_ACEOF
	291	])
	292
	293	dnl #
	294	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	295	dnl #
	296	m4_define([ZFS_LANG_PROGRAM], [
	297	$1
	298	int
	299	main (void)
	300	{
301	dnl Do not indent the following line: there may be CPP directives.
302	dnl Don't move the `;' right after for the same reason.
303	$2
304	;
305	return 0;
306	}
307	])
308
309	dnl #
310	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
311	dnl #
312	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
313	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
314	rm -Rf build && mkdir -p build
315	echo "obj-m := conftest.o" >build/Makefile
316	AS_IF(
317	[AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
318	[$4],
319	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
320	)
321	rm -Rf build
322	])
323
324	dnl #
325	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
326	dnl #
327	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
328	[ZFS_LINUX_COMPILE_IFELSE(
329	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
330	[modules],
331	[test -s build/conftest.o],
332	[$3], [$4])
333	])
334
335	dnl #
336	dnl # ZFS_LINUX_CONFIG
337	dnl #
338	AC_DEFUN([ZFS_LINUX_CONFIG],
339	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
340	ZFS_LINUX_TRY_COMPILE([
341	#ifndef AUTOCONF_INCLUDED
342	#include <linux/config.h>
343	#endif
344	],[
345	#ifndef CONFIG_$1
346	#error CONFIG_$1 not #defined
347	#endif
348	],[
349	AC_MSG_RESULT([yes])
350	$2
351	],[
352	AC_MSG_RESULT([no])
353	$3
354	])
355	])
356
357	dnl #
358	dnl # ZFS_CHECK_SYMBOL_EXPORT
359	dnl # check symbol exported or not
360	dnl #
361	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
362	[AC_MSG_CHECKING([whether symbol $1 is exported])
363	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
364	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
365	rc=$?
366	if test $rc -ne 0; then
367	export=0
368	for file in $2; do
369	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
370	rc=$?
371	if test $rc -eq 0; then
372	export=1
373	break;
374	fi
375	done
376	if test $export -eq 0; then
377	AC_MSG_RESULT([no])
378	$4
379	else
380	AC_MSG_RESULT([yes])
381	$3
382	fi
383	else
384	AC_MSG_RESULT([yes])
385	$3
386	fi
387	])