[mirror_zfs-debian.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

	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\\\""
	KERNELCPPFLAGS="$KERNELCPPFLAGS -I$SPL"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -I$SPL/include"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -include $SPL/spl_config.h"
	KERNELCPPFLAGS="$KERNELCPPFLAGS -include $TOPDIR/zfs_config.h"

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

	AC_SUBST(KERNELMAKE_PARAMS)
	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 $SPL_OBJ/Modules.symvers; then
		SPL_SYMBOLS=Modules.symvers
	else
		SPL_SYMBOLS=$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
		if test -d ${splsrc}/module; then
			splbuild=${splsrc}/module
		else
			splbuild=${splsrc}
		fi
	fi
	AC_MSG_RESULT([$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])
		$3
	fi
])
Commit	Line	Data
c9c0d073 BB	1	dnl #
	2	dnl # Default ZFS kernel configuration
	3	dnl #
	4	AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
	5	ZFS_AC_KERNEL
	6	ZFS_AC_SPL
	7	ZFS_AC_KERNEL_CONFIG
	8	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
	9	ZFS_AC_KERNEL_TYPE_FMODE_T
	10	ZFS_AC_KERNEL_KOBJ_NAME_LEN
	11	ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
	12	ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
	13	ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
	14	ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
	15	ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
	16	ZFS_AC_KERNEL_BIO_RW_SYNCIO
	17	ZFS_AC_KERNEL_BLK_END_REQUEST
	18	ZFS_AC_KERNEL_BLK_FETCH_REQUEST
	19	ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
	20	ZFS_AC_KERNEL_BLK_RQ_BYTES
	21	ZFS_AC_KERNEL_BLK_RQ_POS
	22	ZFS_AC_KERNEL_BLK_RQ_SECTORS
	23	ZFS_AC_KERNEL_GET_DISK_RO
	24	ZFS_AC_KERNEL_RQ_IS_SYNC
	25	ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
	26
	27	dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
	28	dnl # compiler options are added by the kernel build system.
	29	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
	30	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
	31	KERNELCPPFLAGS="$KERNELCPPFLAGS -I$SPL"
	32	KERNELCPPFLAGS="$KERNELCPPFLAGS -I$SPL/include"
	33	KERNELCPPFLAGS="$KERNELCPPFLAGS -include $SPL/spl_config.h"
	34	KERNELCPPFLAGS="$KERNELCPPFLAGS -include $TOPDIR/zfs_config.h"
	35
	36	if test "$LINUX_OBJ" != "$LINUX"; then
	37	KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
	38	fi
	39
	40	AC_SUBST(KERNELMAKE_PARAMS)
	41	AC_SUBST(KERNELCPPFLAGS)
	42	])
	43
	44	dnl #
	45	dnl # Detect name used for Module.symvers file in kernel
	46	dnl #
	47	AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
	48	modpost=$LINUX/scripts/Makefile.modpost
	49	AC_MSG_CHECKING([kernel file name for module symbols])
	50	if test -f "$modpost"; then
	51	if grep -q Modules.symvers $modpost; then
	52	LINUX_SYMBOLS=Modules.symvers
	53	else
	54	LINUX_SYMBOLS=Module.symvers
	55	fi
	56	else
	57	LINUX_SYMBOLS=NONE
	58	fi
	59	AC_MSG_RESULT($LINUX_SYMBOLS)
	60	AC_SUBST(LINUX_SYMBOLS)
	61	])
	62
	63	dnl #
	64	dnl # Detect the kernel to be built against
65	dnl #
66	AC_DEFUN([ZFS_AC_KERNEL], [
67	AC_ARG_WITH([linux],
68	AS_HELP_STRING([--with-linux=PATH],
69	[Path to kernel source]),
70	[kernelsrc="$withval"])
71
72	AC_ARG_WITH(linux-obj,
73	AS_HELP_STRING([--with-linux-obj=PATH],
74	[Path to kernel build objects]),
75	[kernelbuild="$withval"])
76
77	AC_MSG_CHECKING([kernel source directory])
78	if test -z "$kernelsrc"; then
79	headersdir="/lib/modules/$(uname -r)/build"
80	if test -e "$headersdir"; then
81	sourcelink=$(readlink -f "$headersdir")
82	else
83	sourcelink=$(ls -1d /usr/src/kernels/* \
84	/usr/src/linux-* \
85	2>/dev/null \| grep -v obj \| tail -1)
86	fi
87
88	if test -n "$sourcelink" && test -e ${sourcelink}; then
89	kernelsrc=`readlink -f ${sourcelink}`
90	else
91	AC_MSG_RESULT([Not found])
92	AC_MSG_ERROR([
93	*** Please make sure the kernel devel package for your distribution
94	*** is installed then try again. If that fails you can specify the
95	*** location of the kernel source with the '--with-linux=PATH' option.])
96	fi
97	else
98	if test "$kernelsrc" = "NONE"; then
99	kernsrcver=NONE
100	fi
101	fi
102
103	AC_MSG_RESULT([$kernelsrc])
104	AC_MSG_CHECKING([kernel build directory])
105	if test -z "$kernelbuild"; then
106	if test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
107	kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
108	elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
109	kernelbuild=${kernelsrc}-obj/${target_cpu}/default
110	elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
111	kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
112	else
113	kernelbuild=${kernelsrc}
114	fi
115	fi
116	AC_MSG_RESULT([$kernelbuild])
117
118	AC_MSG_CHECKING([kernel source version])
119	utsrelease1=$kernelbuild/include/linux/version.h
120	utsrelease2=$kernelbuild/include/linux/utsrelease.h
121	utsrelease3=$kernelbuild/include/generated/utsrelease.h
122	if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
123	utsrelease=linux/version.h
124	elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
125	utsrelease=linux/utsrelease.h
126	elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
127	utsrelease=generated/utsrelease.h
128	fi
129
130	if test "$utsrelease"; then
131	kernsrcver=`(echo "#include <$utsrelease>";
132	echo "kernsrcver=UTS_RELEASE") \|
133	cpp -I $kernelbuild/include \|
134	grep "^kernsrcver=" \| cut -d \" -f 2`
135
136	if test -z "$kernsrcver"; then
137	AC_MSG_RESULT([Not found])
138	AC_MSG_ERROR([*** Cannot determine kernel version.])
139	fi
140	else
141	AC_MSG_RESULT([Not found])
142	AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
143	fi
144
145	AC_MSG_RESULT([$kernsrcver])
146
147	LINUX=${kernelsrc}
148	LINUX_OBJ=${kernelbuild}
149	LINUX_VERSION=${kernsrcver}
150
151	AC_SUBST(LINUX)
152	AC_SUBST(LINUX_OBJ)
153	AC_SUBST(LINUX_VERSION)
154
155	ZFS_AC_MODULE_SYMVERS
156	])
157
158	dnl #
159	dnl # Detect name used for the additional SPL Module.symvers file. If one
160	dnl # does not exist this is likely because the SPL has been configured
161	dnl # but not built. To allow recursive builds a good guess is made as to
162	dnl # what this file will be named based on what it is named in the kernel
163	dnl # build products. This file will first be used at link time so if
164	dnl # the guess is wrong the build will fail then. This unfortunately
165	dnl # means the ZFS package does not contain a reliable mechanism to
166	dnl # detect symbols exported by the SPL at configure time.
167	dnl #
168	AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
169	AC_MSG_CHECKING([spl file name for module symbols])
170	if test -r $SPL_OBJ/Module.symvers; then
171	SPL_SYMBOLS=Module.symvers
172	elif test -r $SPL_OBJ/Modules.symvers; then
173	SPL_SYMBOLS=Modules.symvers
174	else
175	SPL_SYMBOLS=$LINUX_SYMBOLS
176	fi
177
178	AC_MSG_RESULT([$SPL_SYMBOLS])
179	AC_SUBST(SPL_SYMBOLS)
180	])
181
182	dnl #
183	dnl # Detect the SPL module to be built against
184	dnl #
185	AC_DEFUN([ZFS_AC_SPL], [
186	AC_ARG_WITH([spl],
187	AS_HELP_STRING([--with-spl=PATH],
188	[Path to spl source]),
189	[splsrc="$withval"])
190
191	AC_ARG_WITH([spl-obj],
192	AS_HELP_STRING([--with-spl-obj=PATH],
193	[Path to spl build objects]),
194	[splbuild="$withval"])
195
196
197	AC_MSG_CHECKING([spl source directory])
198	if test -z "$splsrc"; then
199	sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
200	2>/dev/null \| tail -1`
201
202	if test -z "$sourcelink" \|\| test ! -e $sourcelink; then
203	sourcelink=../spl
204	fi
205
206	if test -e $sourcelink; then
207	splsrc=`readlink -f ${sourcelink}`
208	else
209	AC_MSG_RESULT([Not found])
210	AC_MSG_ERROR([
211	*** Please make sure the spl devel package for your distribution
212	*** is installed then try again. If that fails you can specify the
213	*** location of the spl source with the '--with-spl=PATH' option.])
214	fi
215	else
216	if test "$splsrc" = "NONE"; then
217	splbuild=NONE
218	splsrcver=NONE
219	fi
220	fi
221
222	AC_MSG_RESULT([$splsrc])
223	AC_MSG_CHECKING([spl build directory])
224	if test -z "$splbuild"; then
225	if test -d ${splsrc}/module; then
226	splbuild=${splsrc}/module
227	else
228	splbuild=${splsrc}
229	fi
230	fi
231	AC_MSG_RESULT([$splbuild])
232
233	AC_MSG_CHECKING([spl source version])
5e612145 BB	234	if test -r $splbuild/spl_config.h &&
5e612145 BB	235	fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
c9c0d073 BB	236
	237	splsrcver=`(echo "#include <spl_config.h>";
	238	echo "splsrcver=SPL_META_VERSION") \|
5e612145	239	cpp -I $splbuild \|
c9c0d073 BB	240	grep "^splsrcver=" \| cut -d \" -f 2`
	241	fi
	242
	243	if test -z "$splsrcver"; then
	244	AC_MSG_RESULT([Not found])
	245	AC_MSG_ERROR([
	246	*** Cannot determine the version of the spl source.
	247	*** Please prepare the spl source before running this script])
	248	fi
	249
	250	AC_MSG_RESULT([$splsrcver])
	251
	252	SPL=${splsrc}
	253	SPL_OBJ=${splbuild}
	254	SPL_VERSION=${splsrcver}
	255
	256	AC_SUBST(SPL)
	257	AC_SUBST(SPL_OBJ)
	258	AC_SUBST(SPL_VERSION)
	259
	260	ZFS_AC_SPL_MODULE_SYMVERS
	261	])
	262
	263	dnl #
	264	dnl # There are certain kernel build options which when enabled are
	265	dnl # completely incompatible with non GPL kernel modules. It is best
	266	dnl # to detect these at configure time and fail with a clear error
	267	dnl # rather than build everything and fail during linking.
	268	dnl #
	269	dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
	270	dnl #
	271	AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
	272
	273	if test "$ZFS_META_LICENSE" = CDDL; then
	274	ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
	275	AC_MSG_ERROR([
	276	*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
	277	*** incompatible with the CDDL license. You must rebuild
	278	*** your kernel without this option.]), [])
	279	fi
	280
	281	if test "$ZFS_META_LICENSE" = GPL; then
	282	AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
	283	[Define to 1 if licensed under the GPL])
	284	fi
	285	])
	286
	287	dnl #
	288	dnl # ZFS_LINUX_CONFTEST
	289	dnl #
	290	AC_DEFUN([ZFS_LINUX_CONFTEST], [
	291	cat confdefs.h - <<_ACEOF >conftest.c
	292	$1
	293	_ACEOF
	294	])
	295
	296	dnl #
	297	dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
	298	dnl #
	299	m4_define([ZFS_LANG_PROGRAM], [
	300	$1
	301	int
	302	main (void)
	303	{
304	dnl Do not indent the following line: there may be CPP directives.
305	dnl Don't move the `;' right after for the same reason.
306	$2
307	;
308	return 0;
309	}
310	])
311
312	dnl #
313	dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
314	dnl #
315	AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
316	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
317	rm -Rf build && mkdir -p build
318	echo "obj-m := conftest.o" >build/Makefile
319	AS_IF(
320	[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])],
321	[$4],
322	[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
323	)
324	rm -Rf build
325	])
326
327	dnl #
328	dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
329	dnl #
330	AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
331	[ZFS_LINUX_COMPILE_IFELSE(
332	[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
333	[modules],
334	[test -s build/conftest.o],
335	[$3], [$4])
336	])
337
338	dnl #
339	dnl # ZFS_LINUX_CONFIG
340	dnl #
341	AC_DEFUN([ZFS_LINUX_CONFIG],
342	[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
343	ZFS_LINUX_TRY_COMPILE([
344	#ifndef AUTOCONF_INCLUDED
345	#include <linux/config.h>
346	#endif
347	],[
348	#ifndef CONFIG_$1
349	#error CONFIG_$1 not #defined
350	#endif
351	],[
352	AC_MSG_RESULT([yes])
353	$2
354	],[
355	AC_MSG_RESULT([no])
356	$3
357	])
358	])
359
360	dnl #
361	dnl # ZFS_CHECK_SYMBOL_EXPORT
362	dnl # check symbol exported or not
363	dnl #
364	AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
365	[AC_MSG_CHECKING([whether symbol $1 is exported])
366	grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
367	$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
368	rc=$?
369	if test $rc -ne 0; then
370	export=0
371	for file in $2; do
372	grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
373	rc=$?
374	if test $rc -eq 0; then
375	export=1
376	break;
377	fi
378	done
379	if test $export -eq 0; then
380	AC_MSG_RESULT([no])
381	$4
382	else
383	AC_MSG_RESULT([yes])
384	$3
385	fi
386	else
387	AC_MSG_RESULT([yes])
388	$3
389	fi
390	])