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[fs/lustre-release.git] / config / lustre-build-linux.m4
1 #
2 # LB_LINUX_VERSION
3 #
4 # Set things accordingly for a linux kernel
5 #
6 AC_DEFUN([LB_LINUX_VERSION], [
7 KMODEXT=".ko"
8 AC_SUBST(KMODEXT)
9
10 makerule="$PWD/build"
11 AC_CACHE_CHECK([for external module build target], lb_cv_module_target, [
12 lb_cv_module_target=""
13 MODULE_TARGET="SUBDIRS"
14 rm -f build/conftest.i
15 LB_LINUX_TRY_MAKE([], [],
16         [$makerule LUSTRE_KERNEL_TEST=conftest.i],
17         [test -s build/conftest.i],
18         [lb_cv_module_target="SUBDIRS"], [
19                 MODULE_TARGET="M"
20                 makerule="_module_$PWD/build"
21                 LB_LINUX_TRY_MAKE([], [],
22                         [$makerule LUSTRE_KERNEL_TEST=conftest.i],
23                         [test -s build/conftest.i],
24                         [lb_cv_module_target="M"], [
25                                 AC_MSG_ERROR([unknown; check config.log for details])
26                         ])
27         ])
28 ])
29 AS_IF([test -z "$lb_cv_module_target"],
30         [AC_MSG_ERROR([unknown external module build target])],
31 [test "x$lb_cv_module_target" = "xM"],
32         [makerule="_module_$PWD/build"])
33 MODULE_TARGET=$lb_cv_module_target
34 AC_SUBST(MODULE_TARGET)
35 ])
36
37 #
38 # LB_LINUX_UTSRELEASE
39 #
40 # Determine the Linux kernel version string from the utsrelease
41 #
42 AC_DEFUN([LB_LINUX_UTSRELEASE], [
43 AC_CACHE_CHECK([for Linux kernel utsrelease], lb_cv_utsrelease, [
44 lb_cv_utsrelease=""
45 utsrelease1=$LINUX_OBJ/include/generated/utsrelease.h
46 utsrelease2=$LINUX_OBJ/include/linux/utsrelease.h
47 utsrelease3=$LINUX_OBJ/include/linux/version.h
48 AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1],
49         [utsrelease=$utsrelease1],
50 [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2],
51         [utsrelease=$utsrelease2],
52 [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3],
53         [utsrelease=$utsrelease3])
54 AS_IF([test -n "$utsrelease"],
55         [lb_cv_utsrelease=$(awk -F \" '/ UTS_RELEASE / { print [$]2 }' $utsrelease)],
56         [AC_MSG_ERROR([
57
58 Cannot find UTS_RELEASE definition.
59
60 This is often provided by the kernel-devel package.
61 ])
62         ])
63 ])
64 AS_IF([test -z "$lb_cv_utsrelease"],
65         [AC_MSG_ERROR([Cannot determine Linux kernel version.])])
66 LINUXRELEASE=$lb_cv_utsrelease
67 AC_SUBST(LINUXRELEASE)
68 ])
69
70 #
71 # LB_LINUX_RELEASE
72 #
73 # get the release version of linux
74 #
75 AC_DEFUN([LB_LINUX_RELEASE], [
76         LB_LINUX_UTSRELEASE
77
78         # Define default states
79         RHEL_KERNEL="no"
80         SUSE_KERNEL="no"
81         UBUNTU_KERNEL="no"
82         DEBIAN_KERNEL="no"
83         # And if any of the above kernels has been detected yet
84         KERNEL_FOUND="no"
85
86         # Check for RedHat first (no need to check KERNEL_FOUND
87         AC_CACHE_CHECK([for RedHat kernel release number], lb_cv_rhel_kernel_version, [
88                 lb_cv_rhel_kernel_version=""
89                 AS_IF([fgrep -q RHEL_RELEASE $LINUX_OBJ/include/$VERSION_HDIR/version.h], [
90                         lb_cv_rhel_kernel_version=$(awk '/ RHEL_MAJOR / { print [$]3 }' \
91                                 $LINUX_OBJ/include/$VERSION_HDIR/version.h)$(awk \
92                                 '/ RHEL_MINOR / { print [$]3 }' \
93                                 $LINUX_OBJ/include/$VERSION_HDIR/version.h)
94                 ])
95         ])
96         AS_IF([test -n "$lb_cv_rhel_kernel_version"], [
97                 RHEL_KERNEL="yes"
98                 KERNEL_FOUND="yes"
99                 RHEL_RELEASE_NO=$lb_cv_rhel_kernel_version
100         ])
101
102         # Check for SuSE
103         AS_IF([test "x$KERNEL_FOUND" = "xno"], [
104                 LB_CHECK_CONFIG([SUSE_KERNEL], [
105                         SUSE_KERNEL="yes"
106                         KERNEL_FOUND="yes"
107                 ], [])
108         ])
109
110         # Check for Ubuntu
111         AS_IF([test "x$KERNEL_FOUND" = "xno"], [
112                 AC_CACHE_CHECK([for Ubuntu kernel signature], lb_cv_ubuntu_kernel_sig, [
113                         lb_cv_ubuntu_kernel_sig="no"
114                         AS_IF([fgrep -q "CONFIG_VERSION_SIGNATURE \"Ubuntu" $LINUX_OBJ/include/generated/autoconf.h], [
115                                 lb_cv_ubuntu_kernel_sig="yes"
116                         ])
117                 ])
118                 AS_IF([test "x$lb_cv_ubuntu_kernel_sig" = "xyes"], [
119                         UBUNTU_KERNEL="yes"
120                         KERNEL_FOUND="yes"
121                 ])
122         ])
123
124         # Check for Debian
125         AS_IF([test "x$KERNEL_FOUND" = "xno"], [
126                 AC_CACHE_CHECK([for Debian kernel signature], lb_cv_debian_kernel_sig, [
127                         lb_cv_debian_kernel_sig="no"
128                         AS_IF([grep -q "LINUX_PACKAGE_ID\s*\"\s*Debian" $LINUX_OBJ/include/generated/package.h], [
129                                 lb_cv_debian_kernel_sig="yes"
130                         ])
131                 ])
132                 AS_IF([test "x$lb_cv_debian_kernel_sig" = "xyes"], [
133                         DEBIAN_KERNEL="yes"
134                         KERNEL_FOUND="yes"
135                 ])
136         ])
137
138         # If still no kernel was found, a warning is issued
139         AS_IF([test "x$KERNEL_FOUND" = "xno"], [
140                 AC_MSG_WARN([Kernel Distro seems to be neither RedHat, SuSE, Ubuntu nor Debian])
141         ])
142
143         AC_MSG_CHECKING([for Linux kernel module package directory])
144         AC_ARG_WITH([kmp-moddir],
145                 AC_HELP_STRING([--with-kmp-moddir=string],
146                         [set the kmod updates or extra directory]),
147                 [KMP_MODDIR=$withval
148                  IN_KERNEL=''],[
149                 AS_IF([test x$RHEL_KERNEL = xyes], [KMP_MODDIR="extra/kernel"],
150                           [test x$SUSE_KERNEL = xyes], [KMP_MODDIR="updates/kernel"],
151                           [test x$UBUNTU_KERNEL = xyes], [KMP_MODDIR="updates/kernel"],
152                           [test x$DEBIAN_KERNEL = xyes], [KMP_MODDIR="updates/kernel"],
153                           [AC_MSG_WARN([Kernel Distro seems to be neither RedHat, SuSE, Ubuntu nor Debian])]
154                 )
155                 IN_KERNEL="${PACKAGE}"])
156         AC_MSG_RESULT($KMP_MODDIR)
157
158         moduledir="/lib/modules/${LINUXRELEASE}/${KMP_MODDIR}"
159
160         modulefsdir="${moduledir}/fs/${IN_KERNEL}"
161         AC_SUBST(modulefsdir)
162
163         modulenetdir="${moduledir}/net/${IN_KERNEL}"
164         AC_SUBST(modulenetdir)
165
166         AC_SUBST(KMP_MODDIR)
167 ])
168
169 #
170 # LB_LINUX_SYMVERFILE
171 #
172 # SLES 9 uses a different name for this file - unsure about vanilla kernels
173 # around this version, but it matters for servers only.
174 AC_DEFUN([LB_LINUX_SYMVERFILE], [
175 AC_CACHE_CHECK([for the name of module symbol version file], lb_cv_module_symvers, [
176 AS_IF([grep -q Modules.symvers $LINUX/scripts/Makefile.modpost],
177         [lb_cv_module_symvers=Modules.symvers],
178         [lb_cv_module_symvers=Module.symvers])
179 ])
180 SYMVERFILE=$lb_cv_module_symvers
181 AC_SUBST(SYMVERFILE)
182 ])
183
184 #
185 # LB_ARG_REPLACE_PATH(PACKAGE, PATH)
186 #
187 AC_DEFUN([LB_ARG_REPLACE_PATH], [
188 new_configure_args=
189 eval set -- $ac_configure_args
190 for arg; do
191         case $arg in
192                 --with-[$1]=*)
193                         arg=--with-[$1]=[$2] ;;
194                 *\'*)
195                         arg=$(printf %s\n ["$arg"] | sed "s/'/'\\\\\\\\''/g") ;;
196         esac
197         dnl AS_VAR_APPEND([new_configure_args], [" '$arg'"])
198         new_configure_args="$new_configure_args '$arg'"
199 done
200 ac_configure_args=$new_configure_args
201 ])
202
203 #
204 # __LB_ARG_CANON_PATH
205 #
206 # this is the work-horse of the next function
207 #
208 AC_DEFUN([__LB_ARG_CANON_PATH], [
209         [$3]=$(readlink -f $with_$2)
210         LB_ARG_REPLACE_PATH([$1], $[$3])
211 ])
212
213 #
214 # LB_ARG_CANON_PATH
215 #
216 # a front-end for the above function that transforms - and . in the
217 # PACKAGE portion of --with-PACKAGE into _ suitable for variable names
218 #
219 AC_DEFUN([LB_ARG_CANON_PATH], [
220         __LB_ARG_CANON_PATH([$1], m4_translit([$1], [-.], [__]), [$2])
221 ])
222
223 #
224 # LB_LINUX_PATH
225 #
226 # Find paths for linux, handling kernel-source rpms
227 #
228 AC_DEFUN([LB_LINUX_PATH], [
229 for DEFAULT_LINUX in /usr/src/linux-source-* /lib/modules/$(uname -r)/{source,build} /usr/src/linux $(find /usr/src/kernels/ -maxdepth 1 -name @<:@0-9@:>@\* | xargs -r ls -d | tail -n 1); do
230         AS_IF([readlink -q -e $DEFAULT_LINUX >/dev/null], [break])
231 done
232 if test "$DEFAULT_LINUX" = "/lib/modules/$(uname -r)/source"; then
233         PATHS="/lib/modules/$(uname -r)/build"
234 else
235         PATHS="/usr/src/linux-headers-$(uname -r)"
236 fi
237 PATHS+=" $DEFAULT_LINUX"
238 for DEFAULT_LINUX_OBJ in $PATHS; do
239         AS_IF([readlink -q -e $DEFAULT_LINUX_OBJ >/dev/null], [break])
240 done
241
242 AC_MSG_CHECKING([for Linux sources])
243 AC_ARG_WITH([linux],
244         AC_HELP_STRING([--with-linux=path],
245                        [set path to Linux source (default=/lib/modules/$(uname -r)/{source,build},/usr/src/linux)]),
246         [LB_ARG_CANON_PATH([linux], [LINUX])
247         DEFAULT_LINUX_OBJ=$LINUX],
248         [LINUX=$DEFAULT_LINUX])
249 AC_MSG_RESULT([$LINUX])
250 AC_SUBST(LINUX)
251
252 # -------- check for linux --------
253 LB_CHECK_FILE([$LINUX], [],
254         [AC_MSG_ERROR([Kernel source $LINUX could not be found.])])
255
256 # -------- linux objects (for 2.6) --
257 AC_MSG_CHECKING([for Linux objects])
258 AC_ARG_WITH([linux-obj],
259         AC_HELP_STRING([--with-linux-obj=path],
260                         [set path to Linux objects (default=/lib/modules/$(uname -r)/build,/usr/src/linux)]),
261         [LB_ARG_CANON_PATH([linux-obj], [LINUX_OBJ])],
262         [LINUX_OBJ=$DEFAULT_LINUX_OBJ])
263 AC_MSG_RESULT([$LINUX_OBJ])
264 AC_SUBST(LINUX_OBJ)
265
266 # -------- check for .config --------
267 AC_ARG_WITH([linux-config],
268         [AC_HELP_STRING([--with-linux-config=path],
269                         [set path to Linux .conf (default=$LINUX_OBJ/.config)])],
270         [LB_ARG_CANON_PATH([linux-config], [LINUX_CONFIG])],
271         [LINUX_CONFIG=$LINUX_OBJ/.config])
272
273 # -------- check if .config exists --
274 LB_CHECK_FILE([$LINUX_CONFIG], [],
275         [AC_MSG_ERROR([
276
277 Kernel config could not be found.
278 ])
279 ])
280 AC_SUBST(LINUX_CONFIG)
281
282 LB_CHECK_FILE([/boot/kernel.h],
283         [KERNEL_SOURCE_HEADER='/boot/kernel.h'],
284         [LB_CHECK_FILE([/var/adm/running-kernel.h],
285                 [KERNEL_SOURCE_HEADER='/var/adm/running-kernel.h'])])
286
287 AC_ARG_WITH([kernel-source-header],
288         AC_HELP_STRING([--with-kernel-source-header=path],
289                         [Use a different kernel version header.]),
290         [LB_ARG_CANON_PATH([kernel-source-header], [KERNEL_SOURCE_HEADER])])
291
292 # ----------- make dep run? ------------------
293 # at 2.6.19 # $LINUX/include/linux/config.h is removed
294 # and at more old has only one line include <autoconf.h>
295 #
296 LB_CHECK_FILE([$LINUX_OBJ/include/generated/autoconf.h],
297         [AUTOCONF_HDIR=generated],
298         [LB_CHECK_FILE([$LINUX_OBJ/include/linux/autoconf.h],
299                 [AUTOCONF_HDIR=linux],
300                 [AC_MSG_ERROR([Run make config in $LINUX.])])])
301 AC_SUBST(AUTOCONF_HDIR)
302
303 LB_CHECK_FILE([$LINUX_OBJ/include/linux/version.h],
304         [VERSION_HDIR=linux],
305         [LB_CHECK_FILE([$LINUX_OBJ/include/generated/uapi/linux/version.h],
306                 [VERSION_HDIR=generated/uapi/linux],
307                 [AC_MSG_ERROR([Run make config in $LINUX.])])])
308 AC_SUBST(VERSION_HDIR)
309
310 # ----------- kconfig.h exists ---------------
311 # kernel 3.1, $LINUX/include/linux/kconfig.h is added
312 # see kernel commit 2a11c8ea20bf850b3a2c60db8c2e7497d28aba99
313 #
314 LB_CHECK_FILE([$LINUX/include/linux/kconfig.h],
315               [CONFIG_INCLUDE=$LINUX/include/linux/kconfig.h],
316               [CONFIG_INCLUDE=include/$AUTOCONF_HDIR/autoconf.h])
317 AC_SUBST(CONFIG_INCLUDE)
318
319 # ------------ rhconfig.h includes runtime-generated bits --
320 # RedHat kernel-source checks
321
322 # we know this exists after the check above.  if the user
323 # tarred up the tree and ran make dep etc. in it, then
324 # version.h gets overwritten with a standard linux one.
325
326 AS_IF([grep rhconfig $LINUX_OBJ/include/$VERSION_HDIR/version.h >/dev/null], [
327         # This is a clean kernel-source tree, we need to
328         # enable extensive workarounds to get this to build modules
329         LB_CHECK_FILE([$KERNEL_SOURCE_HEADER], [
330                 AS_IF([test $KERNEL_SOURCE_HEADER = '/boot/kernel.h'],
331                         [AC_MSG_WARN([
332
333 Using /boot/kernel.h from RUNNING kernel.
334
335 If this is not what you want, use --with-kernel-source-header.
336 Consult build/README.kernel-source for details.
337 ])
338                 ])],
339                 [AC_MSG_ERROR([
340
341 $KERNEL_SOURCE_HEADER not found.
342
343 Consult build/README.kernel-source for details.
344 ])
345                 ])
346         EXTRA_KCFLAGS="-include $KERNEL_SOURCE_HEADER $EXTRA_KCFLAGS"
347 ])
348
349 # this is needed before we can build modules
350 LB_LINUX_VERSION
351
352 # --- check that we can build modules at all
353 LB_CHECK_COMPILE([that modules can be built at all], build_modules,
354         [], [], [], [
355         AC_MSG_ERROR([
356
357 Kernel modules cannot be built. Consult config.log for details.
358
359 If you are trying to build with a kernel-source rpm,
360 consult build/README.kernel-source
361 ])
362 ])
363
364 LB_LINUX_RELEASE
365 ]) # end of LB_LINUX_PATH
366
367 #
368 # LC_MODULE_LOADING
369 #
370 # after 2.6.28 CONFIG_KMOD is removed, and only CONFIG_MODULES remains
371 # so we test if request_module is implemented or not
372 AC_DEFUN([LC_MODULE_LOADING], [
373 AC_CACHE_CHECK([if Linux kernel module loading is possible], lb_cv_module_loading, [
374 LB_LINUX_TRY_MAKE([
375         #include <linux/kmod.h>
376 ], [
377         int myretval=ENOSYS ;
378         return myretval;
379 ], [
380         $makerule LUSTRE_KERNEL_TEST=conftest.i
381 ], [dnl
382         grep request_module build/conftest.i |dnl
383                 grep -v `grep "int myretval=" build/conftest.i |dnl
384                         cut -d= -f2 | cut -d" "  -f1`dnl
385                 >/dev/null dnl
386 ], [lb_cv_module_loading="yes"], [lb_cv_module_loading="no"])
387 ])
388 AS_IF([test "$lb_cv_module_loading" = yes],
389         [AC_DEFINE(HAVE_MODULE_LOADING_SUPPORT, 1,
390                 [kernel module loading is possible])],
391         [AC_MSG_WARN([
392
393 Kernel module loading support is highly recommended.
394
395 ])
396         ])
397 ])
398
399 #
400 # LB_PROG_LINUX
401 #
402 # linux tests
403 #
404 AC_DEFUN([LB_PROG_LINUX], [
405 LB_LINUX_PATH
406 LB_LINUX_SYMVERFILE
407
408 LB_CHECK_CONFIG([MODULES], [], [
409         AC_MSG_ERROR([
410
411 module support is required to build Lustre kernel modules.
412 ])
413         ])
414
415 LB_CHECK_CONFIG([MODVERSIONS])
416
417 LB_CHECK_CONFIG([KALLSYMS], [], [
418         AC_MSG_ERROR([
419
420 Lustre requires that CONFIG_KALLSYMS is enabled in your kernel.
421 ])
422         ])
423
424 # 2.6.28
425 LC_MODULE_LOADING
426 ])
427
428 #
429 # LB_USES_DPKG
430 #
431 # Determine if the target is a dpkg system or rpm
432 #
433 AC_DEFUN([LB_USES_DPKG], [
434 AC_CACHE_CHECK([if this distro uses dpkg], lb_cv_uses_dpkg, [
435 lb_cv_uses_dpkg="no"
436 AS_CASE([$(which dpkg 2>/dev/null)],[*/dpkg], [lb_cv_uses_dpkg="yes"])
437 ])
438 uses_dpkg=$lb_cv_uses_dpkg
439 ])
440
441 #
442 # LB_CHECK_EXPORT
443 #
444 # check symbol exported or not
445 # $1 - symbol
446 # $2 - file(s) for find.
447 # $3 - do 'yes'
448 # $4 - do 'no'
449 #
450 # 2.6 based kernels - put modversion info into $LINUX/Module.modvers or check
451 #
452 AC_DEFUN([LB_CHECK_EXPORT], [
453 AS_VAR_PUSHDEF([lb_export], [lb_cv_export_$1])dnl
454 AC_CACHE_CHECK([if Linux kernel exports '$1'], lb_export, [
455 AS_VAR_SET([lb_export], [no])
456 AS_IF([grep -q -E '[[[:space:]]]$1[[[:space:]]]' $LINUX_OBJ/$SYMVERFILE 2>/dev/null],
457         [AS_VAR_SET([lb_export], [yes])],
458         [for file in $2; do
459                 AS_IF([grep -q -E "EXPORT_SYMBOL.*\($1\)" "$LINUX/$file" 2>/dev/null], [
460                         AS_VAR_SET([lb_export], [yes])
461                         break
462                 ])
463         done])
464 ])
465 AS_VAR_IF([lb_export], [yes], [$3], [$4])[]dnl
466 AS_VAR_POPDEF([lb_export])dnl
467 ]) # LB_CHECK_EXPORT
468
469 #
470 # LB_CHECK_CONFIG
471 #
472 # check if a given config option is defined
473 # $1 - CONFIG_<name>
474 # $2 - do 'yes'
475 # $3 - do 'no'
476 #
477 AC_DEFUN([LB_CHECK_CONFIG], [
478 LB_CHECK_COMPILE([if Linux kernel was built with CONFIG_$1],
479 config_$1, [
480         #include <$AUTOCONF_HDIR/autoconf.h>
481 ], [
482         #ifndef CONFIG_$1
483         #error CONFIG_$1 not #defined
484         #endif
485 ], [$2], [$3])
486 ]) # LB_CHECK_CONFIG
487
488 #
489 # LB_CHECK_CONFIG_IM
490 #
491 # check if a given config option is builtin or as module
492 # $1 - CONFIG_<name> or CONFIG_<name>_MODULE
493 # $2 - do 'yes'
494 # $3 - do 'no'
495 #
496 AC_DEFUN([LB_CHECK_CONFIG_IM], [
497 LB_CHECK_COMPILE([if Linux kernel was built with CONFIG_$1 in or as module],
498 config_im_$1, [
499         #include <$AUTOCONF_HDIR/autoconf.h>
500 ], [
501         #if !(defined(CONFIG_$1) || defined(CONFIG_$1_MODULE))
502         #error CONFIG_$1 and CONFIG_$1_MODULE not #defined
503         #endif
504 ], [$2], [$3])
505 ]) # LB_CHECK_CONFIG_IM
506
507 #
508 # these are like AC_TRY_COMPILE, but try to build modules against the
509 # kernel, inside the build directory
510 #
511
512 #
513 # LB_LANG_PROGRAM(C)([PROLOGUE], [BODY])
514 # --------------------------------------
515 #
516 m4_define([LB_LANG_PROGRAM],
517 [
518 #include <linux/kernel.h>
519 #include <linux/module.h>
520 $1
521 int
522 main (void)
523 {
524 dnl Do *not* indent the following line: there may be CPP directives.
525 dnl Don't move the `;' right after for the same reason.
526 $2
527   ;
528   return 0;
529 };
530 MODULE_LICENSE("GPL");])
531
532 #
533 # LB_LINUX_COMPILE_IFELSE
534 #
535 # like AC_COMPILE_IFELSE
536 #
537 # $1 - AC_LANG_SOURCE()
538 # $2 - make target
539 # $3 - check command
540 # $4 - do 'yes'
541 # $5 - do 'no'
542 #
543 AC_DEFUN([LB_LINUX_COMPILE_IFELSE],
544 [m4_ifvaln([$1], [AC_LANG_CONFTEST([AC_LANG_SOURCE([$1])])])dnl
545 rm -f build/conftest.o build/conftest.mod.c build/conftest.ko
546 SUBARCH=$(echo $target_cpu | sed -e 's/powerpc.*/powerpc/' -e 's/ppc.*/powerpc/' -e 's/x86_64/x86/' -e 's/i.86/x86/' -e 's/k1om/x86/' -e 's/aarch64.*/arm64/' -e 's/armv7.*/arm/')
547 AS_IF([AC_TRY_COMMAND(cp conftest.c build && make -d [$2] LDFLAGS= ${LD:+LD="$LD"} CC="$CC" -f $PWD/build/Makefile LUSTRE_LINUX_CONFIG=$LINUX_CONFIG LINUXINCLUDE="$EXTRA_CHECK_INCLUDE -I$LINUX/arch/$SUBARCH/include -Iinclude -Iarch/$SUBARCH/include/generated -I$LINUX/include -Iinclude2 -I$LINUX/include/uapi -Iinclude/generated -I$LINUX/arch/$SUBARCH/include/uapi -Iarch/$SUBARCH/include/generated/uapi -I$LINUX/include/uapi -Iinclude/generated/uapi ${SPL_OBJ:+-include $SPL_OBJ/spl_config.h} ${ZFS_OBJ:+-include $ZFS_OBJ/zfs_config.h} ${SPL:+-I$SPL -I$SPL/include } ${ZFS:+-I$ZFS -I$ZFS/include} -include $CONFIG_INCLUDE" -o tmp_include_depends -o scripts -o include/config/MARKER -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $MODULE_TARGET=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
548         [$4],
549         [_AC_MSG_LOG_CONFTEST
550 m4_ifvaln([$5],[$5])dnl])
551 rm -f build/conftest.o build/conftest.mod.c build/conftest.mod.o build/conftest.ko m4_ifval([$1], [build/conftest.c conftest.c])[]dnl
552 ])
553
554 #
555 # LB_LINUX_TRY_COMPILE
556 #
557 # like AC_TRY_COMPILE
558 #
559 AC_DEFUN([LB_LINUX_TRY_COMPILE], [
560 LB_LINUX_COMPILE_IFELSE(
561         [AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])],
562         [modules], [test -s build/conftest.o],
563         [$3], [$4])
564 ])
565
566 #
567 # LB_LINUX_TRY_MAKE
568 #
569 # like LB_LINUX_TRY_COMPILE, but with different arguments
570 #
571 AC_DEFUN([LB_LINUX_TRY_MAKE], [
572 LB_LINUX_COMPILE_IFELSE(
573         [AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])],
574         [$3], [$4], [$5], [$6])
575 ])
576
577 #
578 # LB_CHECK_COMPILE
579 # $1 - checking message
580 # $2 - variable name
581 # $3 - header
582 # $4 - body
583 # $5 - do 'yes'
584 # $6 - do 'no'
585 #
586 AC_DEFUN([LB_CHECK_COMPILE], [
587 AS_VAR_PUSHDEF([lb_compile], [lb_cv_compile_$2])dnl
588 AC_CACHE_CHECK([$1], lb_compile, [
589         LB_LINUX_TRY_COMPILE([$3], [$4],
590                 [AS_VAR_SET([lb_compile], [yes])],
591                 [AS_VAR_SET([lb_compile], [no])])
592 ])
593 AS_VAR_IF([lb_compile], [yes], [$5], [$6])[]dnl
594 AS_VAR_POPDEF([lb_compile])dnl
595 ]) # LB_CHECK_COMPILE
596
597 #
598 # LB_CHECK_LINUX_HEADER
599 #
600 # Like AC_CHECK_HEADER but checks for a kernel-space header
601 #
602 m4_define([LB_CHECK_LINUX_HEADER], [
603 AS_VAR_PUSHDEF([lb_header], [lb_cv_header_$1])dnl
604 AC_CACHE_CHECK([for $1], lb_header, [
605         LB_LINUX_COMPILE_IFELSE([LB_LANG_PROGRAM([@%:@include <$1>])],
606                 [modules], [test -s build/conftest.o],
607                 [AS_VAR_SET([lb_header], [yes])],
608                 [AS_VAR_SET([lb_header], [no])])
609 ])
610 AS_VAR_IF([lb_header], [yes], [$2], [$3])[]dnl
611 AS_VAR_POPDEF([lb_header])dnl
612 ]) # LB_CHECK_LINUX_HEADER