2 dnl # Default ZFS kernel configuration
4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
9 ZFS_AC_KERNEL_DECLARE_EVENT_CLASS
10 ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
11 ZFS_AC_KERNEL_BLOCK_DEVICE_OPERATIONS_RELEASE_VOID
12 ZFS_AC_KERNEL_TYPE_FMODE_T
13 ZFS_AC_KERNEL_KOBJ_NAME_LEN
14 ZFS_AC_KERNEL_3ARG_BLKDEV_GET
15 ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
16 ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
17 ZFS_AC_KERNEL_LOOKUP_BDEV
18 ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
19 ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
20 ZFS_AC_KERNEL_BDEV_PHYSICAL_BLOCK_SIZE
21 ZFS_AC_KERNEL_BIO_BVEC_ITER
22 ZFS_AC_KERNEL_BIO_FAILFAST
23 ZFS_AC_KERNEL_BIO_FAILFAST_DTD
24 ZFS_AC_KERNEL_REQ_FAILFAST_MASK
25 ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
26 ZFS_AC_KERNEL_BIO_RW_SYNC
27 ZFS_AC_KERNEL_BIO_RW_SYNCIO
28 ZFS_AC_KERNEL_REQ_SYNC
29 ZFS_AC_KERNEL_BLK_END_REQUEST
30 ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
31 ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
32 ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
33 ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
34 ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
35 ZFS_AC_KERNEL_BLK_QUEUE_NONROT
36 ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
37 ZFS_AC_KERNEL_BLK_FETCH_REQUEST
38 ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
39 ZFS_AC_KERNEL_BLK_RQ_BYTES
40 ZFS_AC_KERNEL_BLK_RQ_POS
41 ZFS_AC_KERNEL_BLK_RQ_SECTORS
42 ZFS_AC_KERNEL_GET_DISK_RO
43 ZFS_AC_KERNEL_GET_GENDISK
44 ZFS_AC_KERNEL_RQ_IS_SYNC
45 ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
46 ZFS_AC_KERNEL_DISCARD_GRANULARITY
47 ZFS_AC_KERNEL_CONST_XATTR_HANDLER
48 ZFS_AC_KERNEL_XATTR_HANDLER_GET
49 ZFS_AC_KERNEL_XATTR_HANDLER_SET
50 ZFS_AC_KERNEL_XATTR_HANDLER_LIST
51 ZFS_AC_KERNEL_INODE_OWNER_OR_CAPABLE
52 ZFS_AC_KERNEL_POSIX_ACL_FROM_XATTR_USERNS
53 ZFS_AC_KERNEL_POSIX_ACL_RELEASE
54 ZFS_AC_KERNEL_POSIX_ACL_CHMOD
55 ZFS_AC_KERNEL_POSIX_ACL_CACHING
56 ZFS_AC_KERNEL_POSIX_ACL_EQUIV_MODE_WANTS_UMODE_T
57 ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION
58 ZFS_AC_KERNEL_INODE_OPERATIONS_PERMISSION_WITH_NAMEIDATA
59 ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL
60 ZFS_AC_KERNEL_INODE_OPERATIONS_CHECK_ACL_WITH_FLAGS
61 ZFS_AC_KERNEL_INODE_OPERATIONS_GET_ACL
62 ZFS_AC_KERNEL_CURRENT_UMASK
63 ZFS_AC_KERNEL_SHOW_OPTIONS
65 ZFS_AC_KERNEL_EVICT_INODE
66 ZFS_AC_KERNEL_DIRTY_INODE_WITH_FLAGS
67 ZFS_AC_KERNEL_NR_CACHED_OBJECTS
68 ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
69 ZFS_AC_KERNEL_FALLOCATE
70 ZFS_AC_KERNEL_MKDIR_UMODE_T
71 ZFS_AC_KERNEL_LOOKUP_NAMEIDATA
72 ZFS_AC_KERNEL_CREATE_NAMEIDATA
73 ZFS_AC_KERNEL_TRUNCATE_RANGE
74 ZFS_AC_KERNEL_AUTOMOUNT
75 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
76 ZFS_AC_KERNEL_COMMIT_METADATA
77 ZFS_AC_KERNEL_CLEAR_INODE
78 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
79 ZFS_AC_KERNEL_D_MAKE_ROOT
80 ZFS_AC_KERNEL_D_OBTAIN_ALIAS
81 ZFS_AC_KERNEL_D_SET_D_OP
82 ZFS_AC_KERNEL_D_REVALIDATE_NAMEIDATA
83 ZFS_AC_KERNEL_CONST_DENTRY_OPERATIONS
84 ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
85 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
86 ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
87 ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
88 ZFS_AC_KERNEL_MOUNT_NODEV
90 ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
93 ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
94 ZFS_AC_KERNEL_SET_NLINK
95 ZFS_AC_KERNEL_ELEVATOR_CHANGE
96 ZFS_AC_KERNEL_5ARG_SGET
97 ZFS_AC_KERNEL_LSEEK_EXECUTE
98 ZFS_AC_KERNEL_VFS_ITERATE
100 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
101 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
103 AC_SUBST(KERNELMAKE_PARAMS)
106 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
107 dnl # compiler options are added by the kernel build system.
108 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
109 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
110 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
112 AC_SUBST(KERNELCPPFLAGS)
116 dnl # Detect name used for Module.symvers file in kernel
118 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
119 modpost=$LINUX/scripts/Makefile.modpost
120 AC_MSG_CHECKING([kernel file name for module symbols])
121 AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
122 AS_IF([grep -q Modules.symvers $modpost], [
123 LINUX_SYMBOLS=Modules.symvers
125 LINUX_SYMBOLS=Module.symvers
128 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
130 *** Please make sure the kernel devel package for your distribution
131 *** is installed. If you are building with a custom kernel, make sure the
132 *** kernel is configured, built, and the '--with-linux=PATH' configure
133 *** option refers to the location of the kernel source.])
138 AC_MSG_RESULT($LINUX_SYMBOLS)
139 AC_SUBST(LINUX_SYMBOLS)
143 dnl # Detect the kernel to be built against
145 AC_DEFUN([ZFS_AC_KERNEL], [
147 AS_HELP_STRING([--with-linux=PATH],
148 [Path to kernel source]),
149 [kernelsrc="$withval"])
151 AC_ARG_WITH(linux-obj,
152 AS_HELP_STRING([--with-linux-obj=PATH],
153 [Path to kernel build objects]),
154 [kernelbuild="$withval"])
156 AC_MSG_CHECKING([kernel source directory])
157 AS_IF([test -z "$kernelsrc"], [
158 AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
159 headersdir="/lib/modules/$(uname -r)/source"
160 sourcelink=$(readlink -f "$headersdir")
161 ], [test -e "/lib/modules/$(uname -r)/build"], [
162 headersdir="/lib/modules/$(uname -r)/build"
163 sourcelink=$(readlink -f "$headersdir")
165 sourcelink=$(ls -1d /usr/src/kernels/* \
167 2>/dev/null | grep -v obj | tail -1)
170 AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
171 kernelsrc=`readlink -f ${sourcelink}`
173 kernelsrc="[Not found]"
176 AS_IF([test "$kernelsrc" = "NONE"], [
181 AC_MSG_RESULT([$kernelsrc])
182 AS_IF([test ! -d "$kernelsrc"], [
184 *** Please make sure the kernel devel package for your distribution
185 *** is installed and then try again. If that fails, you can specify the
186 *** location of the kernel source with the '--with-linux=PATH' option.])
189 AC_MSG_CHECKING([kernel build directory])
190 AS_IF([test -z "$kernelbuild"], [
191 AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
192 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
193 ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
194 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
195 ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
196 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
197 ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
198 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
200 kernelbuild=${kernelsrc}
203 AC_MSG_RESULT([$kernelbuild])
205 AC_MSG_CHECKING([kernel source version])
206 utsrelease1=$kernelbuild/include/linux/version.h
207 utsrelease2=$kernelbuild/include/linux/utsrelease.h
208 utsrelease3=$kernelbuild/include/generated/utsrelease.h
209 AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
210 utsrelease=linux/version.h
211 ], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
212 utsrelease=linux/utsrelease.h
213 ], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
214 utsrelease=generated/utsrelease.h
217 AS_IF([test "$utsrelease"], [
218 kernsrcver=`(echo "#include <$utsrelease>";
219 echo "kernsrcver=UTS_RELEASE") |
220 cpp -I $kernelbuild/include |
221 grep "^kernsrcver=" | cut -d \" -f 2`
223 AS_IF([test -z "$kernsrcver"], [
224 AC_MSG_RESULT([Not found])
225 AC_MSG_ERROR([*** Cannot determine kernel version.])
228 AC_MSG_RESULT([Not found])
229 if test "x$enable_linux_builtin" != xyes; then
230 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
233 *** Cannot find UTS_RELEASE definition.
234 *** Please run 'make prepare' inside the kernel source tree.])
238 AC_MSG_RESULT([$kernsrcver])
241 LINUX_OBJ=${kernelbuild}
242 LINUX_VERSION=${kernsrcver}
246 AC_SUBST(LINUX_VERSION)
248 ZFS_AC_MODULE_SYMVERS
253 dnl # Detect the SPL module to be built against
255 AC_DEFUN([ZFS_AC_SPL], [
257 AS_HELP_STRING([--with-spl=PATH],
258 [Path to spl source]),
261 AC_ARG_WITH([spl-obj],
262 AS_HELP_STRING([--with-spl-obj=PATH],
263 [Path to spl build objects]),
264 [splbuild="$withval"])
266 AC_ARG_WITH([spl-timeout],
267 AS_HELP_STRING([--with-spl-timeout=SECS],
268 [Wait SECS for SPL header and symver file @<:@default=0@:>@]),
269 [timeout="$withval"], [timeout=0])
272 dnl # The existence of spl.release.in is used to identify a valid
273 dnl # source directory. In order of preference:
275 splsrc0="/var/lib/dkms/spl/${VERSION}/build"
276 splsrc1="/usr/local/src/spl-${VERSION}/${LINUX_VERSION}"
277 splsrc2="/usr/local/src/spl-${VERSION}"
278 splsrc3="/usr/src/spl-${VERSION}/${LINUX_VERSION}"
279 splsrc4="/usr/src/spl-${VERSION}"
283 AC_MSG_CHECKING([spl source directory])
284 AS_IF([test -z "${splsrc}"], [
285 AS_IF([ test -e "${splsrc0}/spl.release.in"], [
287 ], [ test -e "${splsrc1}/spl.release.in"], [
289 ], [ test -e "${splsrc2}/spl.release.in"], [
291 ], [ test -e "${splsrc3}/spl.release.in"], [
292 splsrc=$(readlink -f "${splsrc3}")
293 ], [ test -e "${splsrc4}/spl.release.in" ], [
295 ], [ test -e "${splsrc5}/spl.release.in"], [
296 splsrc=$(readlink -f "${splsrc5}")
297 ], [ test -e "${splsrc6}/spl.release.in" ], [
303 AS_IF([test "$splsrc" = "NONE"], [
309 AC_MSG_RESULT([$splsrc])
310 AS_IF([ test ! -e "$splsrc/spl.release.in"], [
312 *** Please make sure the kmod spl devel package for your distribution
313 *** is installed then try again. If that fails you can specify the
314 *** location of the spl source with the '--with-spl=PATH' option.])
318 dnl # The existence of the spl_config.h is used to identify a valid
319 dnl # spl object directory. In many cases the object and source
320 dnl # directory are the same, however the objects may also reside
321 dnl # is a subdirectory named after the kernel version.
323 dnl # This file is supposed to be available after DKMS finishes
324 dnl # building the SPL kernel module for the target kernel. The
325 dnl # '--with-spl-timeout' option can be passed to pause here,
326 dnl # waiting for the file to appear from a concurrently building
329 AC_MSG_CHECKING([spl build directory])
331 AS_IF([test -z "$splbuild"], [
332 AS_IF([ test -e "${splsrc}/${LINUX_VERSION}/spl_config.h" ], [
333 splbuild="${splsrc}/${LINUX_VERSION}"
334 ], [ test -e "${splsrc}/spl_config.h" ], [
337 splbuild="[Not found]"
340 AS_IF([test -e "$splbuild/spl_config.h" -o $timeout -le 0], [
344 timeout=$((timeout-1))
348 AC_MSG_RESULT([$splbuild])
349 AS_IF([ ! test -e "$splbuild/spl_config.h"], [
351 *** Please make sure the kmod spl devel <kernel> package for your
352 *** distribution is installed then try again. If that fails you
353 *** can specify the location of the spl objects with the
354 *** '--with-spl-obj=PATH' option.])
357 AC_MSG_CHECKING([spl source version])
358 AS_IF([test -r $splbuild/spl_config.h &&
359 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
361 splsrcver=`(echo "#include <spl_config.h>";
362 echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
364 grep "^splsrcver=" | tr -d \" | cut -d= -f2`
367 AS_IF([test -z "$splsrcver"], [
368 AC_MSG_RESULT([Not found])
370 *** Cannot determine the version of the spl source.
371 *** Please prepare the spl source before running this script])
374 AC_MSG_RESULT([$splsrcver])
378 SPL_VERSION=${splsrcver}
382 AC_SUBST(SPL_VERSION)
385 dnl # Detect the name used for the SPL Module.symvers file. If one
386 dnl # does not exist this is likely because the SPL has been configured
387 dnl # but not built. The '--with-spl-timeout' option can be passed
388 dnl # to pause here, waiting for the file to appear from a concurrently
389 dnl # building SPL package. If the file does not appear in time, a good
390 dnl # guess is made as to what this file will be named based on what it
391 dnl # is named in the kernel build products. This file will first be
392 dnl # used at link time so if the guess is wrong the build will fail
393 dnl # then. This unfortunately means the ZFS package does not contain a
394 dnl # reliable mechanism to detect symbols exported by the SPL at
395 dnl # configure time.
397 AC_MSG_CHECKING([spl file name for module symbols])
401 AS_IF([test -r $SPL_OBJ/Module.symvers], [
402 SPL_SYMBOLS=Module.symvers
403 ], [test -r $SPL_OBJ/Modules.symvers], [
404 SPL_SYMBOLS=Modules.symvers
405 ], [test -r $SPL_OBJ/module/Module.symvers], [
406 SPL_SYMBOLS=Module.symvers
407 ], [test -r $SPL_OBJ/module/Modules.symvers], [
408 SPL_SYMBOLS=Modules.symvers
411 AS_IF([test $SPL_SYMBOLS != NONE -o $timeout -le 0], [
415 timeout=$((timeout-1))
419 AS_IF([test "$SPL_SYMBOLS" = NONE], [
420 SPL_SYMBOLS=$LINUX_SYMBOLS
423 AC_MSG_RESULT([$SPL_SYMBOLS])
424 AC_SUBST(SPL_SYMBOLS)
428 dnl # Basic toolchain sanity check.
430 AC_DEFUN([ZFS_AC_TEST_MODULE], [
431 AC_MSG_CHECKING([whether modules can be built])
432 ZFS_LINUX_TRY_COMPILE([],[],[
436 if test "x$enable_linux_builtin" != xyes; then
437 AC_MSG_ERROR([*** Unable to build an empty module.])
440 *** Unable to build an empty module.
441 *** Please run 'make scripts' inside the kernel source tree.])
447 dnl # Certain kernel build options are not supported. These must be
448 dnl # detected at configure time and cause a build failure. Otherwise
449 dnl # modules may be successfully built that behave incorrectly.
451 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
454 #include "$LINUX/include/linux/license.h"
456 return !license_is_gpl_compatible("$ZFS_META_LICENSE");
459 AC_DEFINE([ZFS_IS_GPL_COMPATIBLE], [1],
460 [Define to 1 if GPL-only symbols can be used])
464 ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
468 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
470 dnl # This is typically only set for debug kernels because it comes with
471 dnl # a performance penalty. However, when it is set it maps the non-GPL
472 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
473 dnl # This will cause a failure at link time which we'd rather know about
474 dnl # at compile time.
476 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
477 dnl # with the upstream community we add a check to detect this case.
479 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
481 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
482 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
483 tmp_flags="$EXTRA_KCFLAGS"
484 ZFS_LINUX_TRY_COMPILE([
485 #include <linux/module.h>
486 #include <linux/mutex.h>
488 MODULE_LICENSE("$ZFS_META_LICENSE");
500 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
501 *** with the CDDL license and will prevent the module linking stage
502 *** from succeeding. You must rebuild your kernel without this
503 *** option enabled.])
505 EXTRA_KCFLAGS="$tmp_flags"
510 dnl # ZFS_LINUX_CONFTEST_H
512 AC_DEFUN([ZFS_LINUX_CONFTEST_H], [
513 cat - <<_ACEOF >conftest.h
519 dnl # ZFS_LINUX_CONFTEST_C
521 AC_DEFUN([ZFS_LINUX_CONFTEST_C], [
522 cat confdefs.h - <<_ACEOF >conftest.c
528 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
530 m4_define([ZFS_LANG_PROGRAM], [
535 dnl Do *not* indent the following line: there may be CPP directives.
536 dnl Don't move the `;' right after for the same reason.
544 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
546 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
547 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST_C([$1])])
548 m4_ifvaln([$6], [ZFS_LINUX_CONFTEST_H([$6])], [ZFS_LINUX_CONFTEST_H([])])
549 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
550 echo "obj-m := conftest.o" >build/Makefile
552 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
554 [AC_TRY_COMMAND(cp conftest.c conftest.h build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
556 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
562 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
564 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
565 [ZFS_LINUX_COMPILE_IFELSE(
566 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
568 [test -s build/conftest.o],
573 dnl # ZFS_LINUX_CONFIG
575 AC_DEFUN([ZFS_LINUX_CONFIG],
576 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
577 ZFS_LINUX_TRY_COMPILE([
578 #include <linux/module.h>
581 #error CONFIG_$1 not #defined
593 dnl # ZFS_CHECK_SYMBOL_EXPORT
594 dnl # check symbol exported or not
596 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
597 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
598 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
600 if test $rc -ne 0; then
603 grep -q -E "EXPORT_SYMBOL.*($1)" \
604 "$LINUX/$file" 2>/dev/null
606 if test $rc -eq 0; then
611 if test $export -eq 0; then :
622 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
623 dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
624 dnl # is called if not compiling for builtin
626 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
627 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
628 if test $rc -ne 0; then :
631 if test "x$enable_linux_builtin" != xyes; then
632 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
634 if test $rc -ne 0; then :
643 dnl # ZFS_LINUX_TRY_COMPILE_HEADER
644 dnl # like ZFS_LINUX_TRY_COMPILE, except the contents conftest.h are
645 dnl # provided via the fifth parameter
647 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_HEADER],
648 [ZFS_LINUX_COMPILE_IFELSE(
649 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
651 [test -s build/conftest.o],
652 [$3], [$4], [AC_LANG_SOURCE([$5])])