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
   9 MODULE_TARGET="SUBDIRS"
  10 makerule="$PWD/build"
  11 AC_MSG_CHECKING([for external module build support])
  12 rm -f build/conftest.i
  13 LB_LINUX_TRY_MAKE([],[],
  14         [$makerule LUSTRE_KERNEL_TEST=conftest.i],
  15         [test -s build/conftest.i],
  16         [
  17                 AC_MSG_RESULT([no])
  18         ],[
  19                 makerule="_module_$makerule"
  20                 MODULE_TARGET="M"
  21                 LB_LINUX_TRY_MAKE([],[],
  22                         [$makerule LUSTRE_KERNEL_TEST=conftest.i],
  23                         [test -s build/conftest.i],
  24                         [
  25                                 AC_MSG_RESULT([yes])
  26                         ],[
  27                                 AC_MSG_ERROR([unknown; check config.log for details])
  28                         ])
  29         ])
  30
  31 AC_SUBST(MODULE_TARGET)
  32 AC_SUBST(KMODEXT)
  33 ])
  34
  35 #
  36 # LB_LINUX_UTSRELEASE
  37 #
  38 # Determine the Linux kernel version string from the utsrelease
  39 #
  40 AC_DEFUN([LB_LINUX_UTSRELEASE], [
  41         AC_MSG_CHECKING([kernel source version])
  42
  43         utsrelease1=${LINUX_OBJ}/include/generated/utsrelease.h
  44         utsrelease2=${LINUX_OBJ}/include/linux/utsrelease.h
  45         utsrelease3=${LINUX_OBJ}/include/linux/version.h
  46         AS_IF([test -r ${utsrelease1} && fgrep -q UTS_RELEASE ${utsrelease1}], [
  47                 utsrelease=${utsrelease1}
  48         ], [test -r ${utsrelease2} && fgrep -q UTS_RELEASE ${utsrelease2}], [
  49                 utsrelease=${utsrelease2}
  50         ], [test -r ${utsrelease3} && fgrep -q UTS_RELEASE ${utsrelease3}], [
  51                 utsrelease=${utsrelease3}
  52         ])
  53
  54         AS_IF([test ! -z "${utsrelease}"], [
  55                 UTS_RELEASE=$(awk -F \" '/ UTS_RELEASE / { print [$]2 }' \
  56                               ${utsrelease})
  57                 AS_IF([test -z "$UTS_RELEASE"], [
  58                         AC_MSG_RESULT([Not found])
  59                         AC_MSG_ERROR([Cannot determine kernel version.])
  60                 ])
  61         ], [
  62                 AC_MSG_RESULT([Not found])
  63                 AC_MSG_ERROR([
  64
  65 Cannot find UTS_RELEASE definition.
  66
  67 This is often provided by the kernel-devel package.
  68 ])
  69         ])
  70
  71         AC_MSG_RESULT([${UTS_RELEASE}])
  72
  73         LINUX_VERSION=${UTS_RELEASE}
  74         AC_SUBST(LINUX_VERSION)
  75         LINUXRELEASE=${UTS_RELEASE}
  76         AC_SUBST(LINUXRELEASE)
  77 ])
  78
  79
  80 #
  81 # LB_LINUX_RELEASE
  82 #
  83 # get the release version of linux
  84 #
  85 AC_DEFUN([LB_LINUX_RELEASE],
  86 [
  87 LB_LINUX_UTSRELEASE
  88
  89 # ------------ RELEASE --------------------------------
  90 AC_MSG_CHECKING([for Lustre release])
  91 AC_ARG_WITH([release],
  92         AC_HELP_STRING([--with-release=string],
  93                        [set the release string (default=$kvers_YYYYMMDDhhmm)]),
  94         [RELEASE=$withval],[
  95         RELEASE=""
  96         if test -n "$DOWNSTREAM_RELEASE"; then
  97                 RELEASE="${DOWNSTREAM_RELEASE}_"
  98         fi
  99         RELEASE="$RELEASE`echo ${LINUXRELEASE} | tr '-' '_'`_$BUILDID"])
 100 AC_MSG_RESULT($RELEASE)
 101 AC_SUBST(RELEASE)
 102
 103 # check if the kernel is one from RHEL or SUSE
 104 AC_MSG_CHECKING([for RedHat kernel version])
 105         AS_IF([fgrep -q RHEL_RELEASE ${LINUX_OBJ}/include/$VERSION_HDIR/version.h], [
 106                 RHEL_KERNEL="yes"
 107                 RHEL_RELEASE=$(expr 0$(awk -F \" '/ RHEL_RELEASE / { print [$]2 }' \
 108                                ${LINUX_OBJ}/include/$VERSION_HDIR/version.h) + 1)
 109                 KERNEL_VERSION=$(sed -e 's/\(@<:@23@:>@\.@<:@0-9@:>@*\.@<:@0-9@:>@*\).*/\1/' <<< ${LINUXRELEASE})
 110                 RHEL_KERNEL_VERSION=${KERNEL_VERSION}-${RHEL_RELEASE}
 111                 AC_SUBST(RHEL_KERNEL_VERSION)
 112                 AC_MSG_RESULT([${RHEL_KERNEL_VERSION}])
 113         ], [
 114                 AC_MSG_RESULT([not found])
 115                 LB_LINUX_CONFIG([SUSE_KERNEL],[SUSE_KERNEL="yes"],[])
 116         ])
 117
 118 AC_MSG_CHECKING([for kernel module package directory])
 119 AC_ARG_WITH([kmp-moddir],
 120         AC_HELP_STRING([--with-kmp-moddir=string],
 121                        [set the kmod updates or extra directory]),
 122         [KMP_MODDIR=$withval],[
 123         AS_IF([test x$RHEL_KERNEL = xyes], [KMP_MODDIR="extra"],
 124               [test x$SUSE_KERNEL = xyes], [KMP_MODDIR="updates"])])
 125
 126 AC_MSG_RESULT($KMP_MODDIR)
 127 AC_SUBST(KMP_MODDIR)
 128
 129 moduledir='$(CROSS_PATH)/lib/modules/$(LINUXRELEASE)/$(KMP_MODDIR)/kernel'
 130 AC_SUBST(moduledir)
 131
 132 modulefsdir='$(moduledir)/fs/$(PACKAGE)'
 133 AC_SUBST(modulefsdir)
 134
 135 modulenetdir='$(moduledir)/net/$(PACKAGE)'
 136 AC_SUBST(modulenetdir)
 137
 138 ])
 139
 140 # LB_ARG_REPLACE_PATH(PACKAGE, PATH)
 141 AC_DEFUN([LB_ARG_REPLACE_PATH],[
 142         new_configure_args=
 143         eval "set x $ac_configure_args"
 144         shift
 145         for arg; do
 146                 case $arg in
 147                         --with-[$1]=*)
 148                                 arg=--with-[$1]=[$2]
 149                                 ;;
 150                         *\'*)
 151                                 arg=$(printf %s\n ["$arg"] | \
 152                                       sed "s/'/'\\\\\\\\''/g")
 153                                 ;;
 154                 esac
 155                 dnl AS_VAR_APPEND([new_configure_args], [" '$arg'"])
 156                 new_configure_args="$new_configure_args \"$arg\""
 157         done
 158         ac_configure_args=$new_configure_args
 159 ])
 160
 161 # this is the work-horse of the next function
 162 AC_DEFUN([__LB_ARG_CANON_PATH], [
 163         [$3]=$(readlink -f $with_$2)
 164         LB_ARG_REPLACE_PATH([$1], $[$3])
 165 ])
 166
 167 # a front-end for the above function that transforms - and . in the
 168 # PACKAGE portion of --with-PACKAGE into _ suitable for variable names
 169 AC_DEFUN([LB_ARG_CANON_PATH], [
 170         __LB_ARG_CANON_PATH([$1], m4_translit([$1], [-.], [__]), [$2])
 171 ])
 172
 173 #
 174 #
 175 # LB_LINUX_PATH
 176 #
 177 # Find paths for linux, handling kernel-source rpms
 178 #
 179 AC_DEFUN([LB_LINUX_PATH],
 180 [# prep some default values
 181 for DEFAULT_LINUX in /lib/modules/$(uname -r)/{source,build} /usr/src/linux; do
 182         if readlink -q -e $DEFAULT_LINUX; then
 183                 break
 184         fi
 185 done
 186 if test "$DEFAULT_LINUX" = "/lib/modules/$(uname -r)/source"; then
 187         PATHS="/lib/modules/$(uname -r)/build"
 188 fi
 189 PATHS+=" $DEFAULT_LINUX"
 190 for DEFAULT_LINUX_OBJ in $PATHS; do
 191         if readlink -q -e $DEFAULT_LINUX_OBJ; then
 192                 break
 193         fi
 194 done
 195 AC_MSG_CHECKING([for Linux sources])
 196 AC_ARG_WITH([linux],
 197         AC_HELP_STRING([--with-linux=path],
 198                        [set path to Linux source (default=/lib/modules/$(uname -r)/{source,build},/usr/src/linux)]),
 199         [LB_ARG_CANON_PATH([linux], [LINUX])
 200         DEFAULT_LINUX_OBJ=$LINUX],
 201         [LINUX=$DEFAULT_LINUX])
 202 AC_MSG_RESULT([$LINUX])
 203 AC_SUBST(LINUX)
 204
 205 # -------- check for linux --------
 206 LB_CHECK_FILE([$LINUX],[],
 207         [AC_MSG_ERROR([Kernel source $LINUX could not be found.])])
 208
 209 # -------- linux objects (for 2.6) --
 210 AC_MSG_CHECKING([for Linux objects dir])
 211 AC_ARG_WITH([linux-obj],
 212         AC_HELP_STRING([--with-linux-obj=path],
 213                         [set path to Linux objects dir (default=/lib/modules/$(uname -r)/build,/usr/src/linux)]),
 214         [LB_ARG_CANON_PATH([linux-obj], [LINUX_OBJ])],
 215         [LINUX_OBJ=$DEFAULT_LINUX_OBJ])
 216
 217 AC_MSG_RESULT([$LINUX_OBJ])
 218 AC_SUBST(LINUX_OBJ)
 219
 220 # -------- check for .config --------
 221 AC_ARG_WITH([linux-config],
 222         [AC_HELP_STRING([--with-linux-config=path],
 223                         [set path to Linux .conf (default=$LINUX_OBJ/.config)])],
 224         [LB_ARG_CANON_PATH([linux-config], [LINUX_CONFIG])],
 225         [LINUX_CONFIG=$LINUX_OBJ/.config])
 226 AC_SUBST(LINUX_CONFIG)
 227
 228 LB_CHECK_FILE([/boot/kernel.h],
 229         [KERNEL_SOURCE_HEADER='/boot/kernel.h'],
 230         [LB_CHECK_FILE([/var/adm/running-kernel.h],
 231                 [KERNEL_SOURCE_HEADER='/var/adm/running-kernel.h'])])
 232
 233 AC_ARG_WITH([kernel-source-header],
 234         AC_HELP_STRING([--with-kernel-source-header=path],
 235                         [Use a different kernel version header.  Consult build/README.kernel-source for details.]),
 236         [LB_ARG_CANON_PATH([kernel-source-header], [KERNEL_SOURCE_HEADER])])
 237
 238 # ------------ .config exists ----------------
 239 LB_CHECK_FILE([$LINUX_CONFIG],[],
 240         [AC_MSG_ERROR([
 241
 242 Kernel config could not be found.
 243
 244 If you are building from a kernel-source rpm consult build/README.kernel-source
 245 ])
 246 ])
 247
 248 # ----------- make dep run? ------------------
 249 # at 2.6.19 # $LINUX/include/linux/config.h is removed
 250 # and at more old has only one line
 251 # include <autoconf.h>
 252 LB_CHECK_FILE([$LINUX_OBJ/include/generated/autoconf.h],[AUTOCONF_HDIR=generated],
 253         [LB_CHECK_FILE([$LINUX_OBJ/include/linux/autoconf.h],[AUTOCONF_HDIR=linux],
 254         [AC_MSG_ERROR([Run make config in $LINUX.])])])
 255         AC_SUBST(AUTOCONF_HDIR)
 256 LB_CHECK_FILE([$LINUX_OBJ/include/linux/version.h], [VERSION_HDIR=linux],
 257         [LB_CHECK_FILE([$LINUX_OBJ/include/generated/uapi/linux/version.h],
 258                 [VERSION_HDIR=generated/uapi/linux],
 259                 [AC_MSG_ERROR([Run make config in $LINUX.])])
 260         ])
 261         AC_SUBST(VERSION_HDIR)
 262
 263 # ----------- kconfig.h exists ---------------
 264 # kernel 3.1, $LINUX/include/linux/kconfig.h is added
 265 # see kernel commit 2a11c8ea20bf850b3a2c60db8c2e7497d28aba99
 266 LB_CHECK_FILE([$LINUX_OBJ/include/linux/kconfig.h],
 267               [CONFIG_INCLUDE=include/linux/kconfig.h],
 268               [CONFIG_INCLUDE=include/$AUTOCONF_HDIR/autoconf.h])
 269         AC_SUBST(CONFIG_INCLUDE)
 270
 271 # ------------ rhconfig.h includes runtime-generated bits --
 272 # red hat kernel-source checks
 273
 274 # we know this exists after the check above.  if the user
 275 # tarred up the tree and ran make dep etc. in it, then
 276 # version.h gets overwritten with a standard linux one.
 277
 278 if grep rhconfig $LINUX_OBJ/include/$VERSION_HDIR/version.h >/dev/null ; then
 279         # This is a clean kernel-source tree, we need to
 280         # enable extensive workarounds to get this to build
 281         # modules
 282         LB_CHECK_FILE([$KERNEL_SOURCE_HEADER],
 283                 [if test $KERNEL_SOURCE_HEADER = '/boot/kernel.h' ; then
 284                         AC_MSG_WARN([
 285
 286 Using /boot/kernel.h from RUNNING kernel.
 287
 288 If this is not what you want, use --with-kernel-source-header.
 289 Consult build/README.kernel-source for details.
 290 ])
 291                 fi],
 292                 [AC_MSG_ERROR([$KERNEL_SOURCE_HEADER not found.  Consult build/README.kernel-source for details.])])
 293         EXTRA_KCFLAGS="-include $KERNEL_SOURCE_HEADER $EXTRA_KCFLAGS"
 294 fi
 295
 296 # this is needed before we can build modules
 297 LB_LINUX_CROSS
 298 LB_LINUX_VERSION
 299
 300 # --- check that we can build modules at all
 301 AC_MSG_CHECKING([that modules can be built at all])
 302 LB_LINUX_TRY_COMPILE([],[],[
 303         AC_MSG_RESULT([yes])
 304 ],[
 305         AC_MSG_RESULT([no])
 306         AC_MSG_ERROR([
 307
 308 Kernel modules cannot be built. Consult config.log for details.
 309
 310 If you are trying to build with a kernel-source rpm,
 311 consult build/README.kernel-source
 312 ])
 313 ])
 314
 315 LB_LINUX_RELEASE
 316 ]) # end of LB_LINUX_PATH
 317
 318 # LB_LINUX_SYMVERFILE
 319 # SLES 9 uses a different name for this file - unsure about vanilla kernels
 320 # around this version, but it matters for servers only.
 321 AC_DEFUN([LB_LINUX_SYMVERFILE],
 322         [AC_MSG_CHECKING([name of module symbol version file])
 323         if grep -q Modules.symvers $LINUX/scripts/Makefile.modpost ; then
 324                 SYMVERFILE=Modules.symvers
 325         else
 326                 SYMVERFILE=Module.symvers
 327         fi
 328         AC_MSG_RESULT($SYMVERFILE)
 329         AC_SUBST(SYMVERFILE)
 330 ])
 331
 332 #
 333 # LB_LINUX_CROSS
 334 #
 335 # check for cross compilation
 336 #
 337 AC_DEFUN([LB_LINUX_CROSS],
 338         [AC_MSG_CHECKING([for cross compilation])
 339 AS_IF([test "x$cross_compiling" = xno], [AC_MSG_RESULT([no])],
 340         [case $host_vendor in
 341                 # The K1OM architecture is an extension of the x86 architecture
 342                 # and in MPSS 2.1 it's defined in $host_vendor. But in MPSS 3.x
 343                 # it's defined in $host_arch. So, try to support both case.
 344                 k1om | mpss)
 345                         AC_MSG_RESULT([Intel(R) Xeon Phi(TM)])
 346                         CC_TARGET_ARCH=`$CC -v 2>&1 | grep Target: | sed -e 's/Target: //'`
 347                         AC_SUBST(CC_TARGET_ARCH)
 348                         if test \( $CC_TARGET_ARCH != x86_64-k1om-linux \
 349                                 -a $CC_TARGET_ARCH != k1om-mpss-linux \)
 350                         then
 351                                 AC_MSG_ERROR([Cross compiler not found in PATH.])
 352                         fi
 353                         CROSS_VARS="ARCH=k1om CROSS_COMPILE=${CC_TARGET_ARCH}-"
 354                         CROSS_PATH="${CROSS_PATH:=/opt/lustre/${VERSION}/${CC_TARGET_ARCH}}"
 355                         CCAS=$CC
 356                         # need to produce special section for debuginfo extraction
 357                         LDFLAGS="${LDFLAGS} -Wl,--build-id"
 358                         EXTRA_KLDFLAGS="${EXTRA_KLDFLAGS} -Wl,--build-id"
 359                         if test x$enable_server != xno ; then
 360                                 AC_MSG_WARN([Disabling server (not supported for k1om architecture).])
 361                                 enable_server='no'
 362                         fi
 363                         ;;
 364                 *)
 365                         AC_MSG_RESULT([yes, but no changes])
 366                         ;;
 367         esac
 368         ])
 369 AC_SUBST(CROSS_VARS)
 370 AC_SUBST(CROSS_PATH)
 371 ])
 372
 373 # these are like AC_TRY_COMPILE, but try to build modules against the
 374 # kernel, inside the build directory
 375
 376 # LB_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 377 # --------------------------------------
 378 m4_define([LB_LANG_PROGRAM],
 379 [
 380 #include <linux/kernel.h>
 381 $1
 382 int
 383 main (void)
 384 {
 385 dnl Do *not* indent the following line: there may be CPP directives.
 386 dnl Don't move the `;' right after for the same reason.
 387 $2
 388   ;
 389   return 0;
 390 }])
 391
 392 #
 393 # LB_LINUX_COMPILE_IFELSE
 394 #
 395 # like AC_COMPILE_IFELSE
 396 #
 397 AC_DEFUN([LB_LINUX_COMPILE_IFELSE],
 398 [m4_ifvaln([$1], [AC_LANG_CONFTEST([$1])])dnl
 399 rm -f build/conftest.o build/conftest.mod.c build/conftest.ko
 400 SUBARCH=$(echo $target_cpu | sed -e 's/powerpc64/powerpc/' -e 's/x86_64/x86/' -e 's/i.86/x86/' -e 's/k1om/x86/')
 401 AS_IF([AC_TRY_COMMAND(cp conftest.c build && make -d [$2] ${LD:+"LD=$LD"} CC="$CC" -f $PWD/build/Makefile LUSTRE_LINUX_CONFIG=$LINUX_CONFIG LINUXINCLUDE="$EXTRA_OFED_INCLUDE -I$LINUX/arch/$SUBARCH/include -I$LINUX/arch/$SUBARCH/include/generated -Iinclude -I$LINUX/include -Iinclude2 -I$LINUX/include/uapi -I$LINUX/include/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" $CROSS_VARS $MODULE_TARGET=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
 402         [$4],
 403         [_AC_MSG_LOG_CONFTEST
 404 m4_ifvaln([$5],[$5])dnl])
 405 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
 406 ])
 407
 408 #
 409 # LB_LINUX_ARCH
 410 #
 411 # Determine the kernel's idea of the current architecture
 412 #
 413 AC_DEFUN([LB_LINUX_ARCH],
 414          [AC_MSG_CHECKING([Linux kernel architecture])
 415           AS_IF([rm -f $PWD/build/arch
 416                  make -s --no-print-directory echoarch -f $PWD/build/Makefile \
 417                      LUSTRE_LINUX_CONFIG=$LINUX_CONFIG -C $LINUX $CROSS_VARS  \
 418                      ARCHFILE=$PWD/build/arch && LINUX_ARCH=`cat $PWD/build/arch`],
 419                 [AC_MSG_RESULT([$LINUX_ARCH])],
 420                 [AC_MSG_ERROR([Could not determine the kernel architecture.])])
 421           rm -f build/arch])
 422
 423 #
 424 # LB_LINUX_TRY_COMPILE
 425 #
 426 # like AC_TRY_COMPILE
 427 #
 428 AC_DEFUN([LB_LINUX_TRY_COMPILE],
 429 [LB_LINUX_COMPILE_IFELSE(
 430         [AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])],
 431         [modules],
 432         [test -s build/conftest.o],
 433         [$3], [$4])])
 434
 435 #
 436 # LB_LINUX_CONFIG
 437 #
 438 # check if a given config option is defined
 439 #
 440 AC_DEFUN([LB_LINUX_CONFIG],[
 441         AC_MSG_CHECKING([if Linux was built with CONFIG_$1])
 442         LB_LINUX_TRY_COMPILE([
 443                 #include <$AUTOCONF_HDIR/autoconf.h>
 444         ],[
 445                 #ifndef CONFIG_$1
 446                 #error CONFIG_$1 not #defined
 447                 #endif
 448         ],[
 449                 AC_MSG_RESULT([yes])
 450                 $2
 451         ],[
 452                 AC_MSG_RESULT([no])
 453                 $3
 454         ])
 455 ])
 456
 457 #
 458 # LB_LINUX_CONFIG_IM
 459 #
 460 # check if a given config option is builtin or as module
 461 #
 462 AC_DEFUN([LB_LINUX_CONFIG_IM],[
 463         AC_MSG_CHECKING([if Linux was built with CONFIG_$1 in or as module])
 464         LB_LINUX_TRY_COMPILE([
 465                 #include <$AUTOCONF_HDIR/autoconf.h>
 466         ],[
 467                 #if !(defined(CONFIG_$1) || defined(CONFIG_$1_MODULE))
 468                 #error CONFIG_$1 and CONFIG_$1_MODULE not #defined
 469                 #endif
 470         ],[
 471                 AC_MSG_RESULT([yes])
 472                 $2
 473         ],[
 474                 AC_MSG_RESULT([no])
 475                 $3
 476         ])
 477 ])
 478
 479 #
 480 # LB_LINUX_TRY_MAKE
 481 #
 482 # like LB_LINUX_TRY_COMPILE, but with different arguments
 483 #
 484 AC_DEFUN([LB_LINUX_TRY_MAKE],
 485         [LB_LINUX_COMPILE_IFELSE(
 486                 [AC_LANG_SOURCE([LB_LANG_PROGRAM([[$1]], [[$2]])])],
 487                 [$3], [$4], [$5], [$6]
 488         )]
 489 )
 490
 491 # LC_MODULE_LOADING
 492 # after 2.6.28 CONFIG_KMOD is removed, and only CONFIG_MODULES remains
 493 # so we test if request_module is implemented or not
 494 AC_DEFUN([LC_MODULE_LOADING],
 495 [AC_MSG_CHECKING([if kernel module loading is possible])
 496 LB_LINUX_TRY_MAKE([
 497         #include <linux/kmod.h>
 498 ],[
 499         int myretval=ENOSYS ;
 500         return myretval;
 501 ],[
 502         $makerule LUSTRE_KERNEL_TEST=conftest.i
 503 ],[dnl
 504         grep request_module build/conftest.i |dnl
 505                 grep -v `grep "int myretval=" build/conftest.i |dnl
 506                         cut -d= -f2 | cut -d" "  -f1`dnl
 507                 >/dev/null dnl
 508 ],[
 509         AC_MSG_RESULT(yes)
 510         AC_DEFINE(HAVE_MODULE_LOADING_SUPPORT, 1,
 511                   [kernel module loading is possible])
 512 ],[
 513         AC_MSG_RESULT(no)
 514         AC_MSG_WARN([
 515
 516 Kernel module loading support is highly recommended.
 517 ])
 518 ])
 519 ])
 520
 521 #
 522 # LB_PROG_LINUX
 523 #
 524 # linux tests
 525 #
 526 AC_DEFUN([LB_PROG_LINUX],
 527 [LB_LINUX_PATH
 528 LB_LINUX_ARCH
 529 LB_LINUX_SYMVERFILE
 530
 531
 532 LB_LINUX_CONFIG([MODULES],[],[
 533         AC_MSG_ERROR([
 534
 535 module support is required to build Lustre kernel modules.
 536 ])
 537 ])
 538
 539 LB_LINUX_CONFIG([MODVERSIONS])
 540
 541 LB_LINUX_CONFIG([KALLSYMS],[],[
 542         AC_MSG_ERROR([
 543
 544 Lustre requires that CONFIG_KALLSYMS is enabled in your kernel.
 545 ])
 546 ])
 547
 548 # 2.6.28
 549 LC_MODULE_LOADING
 550 ])
 551
 552 #
 553 # LB_CHECK_SYMBOL_EXPORT
 554 # check symbol exported or not
 555 # $1 - symbol
 556 # $2 - file(s) for find.
 557 # $3 - do 'yes'
 558 # $4 - do 'no'
 559 #
 560 # 2.6 based kernels - put modversion info into $LINUX/Module.modvers
 561 # or check
 562 AC_DEFUN([LB_CHECK_SYMBOL_EXPORT],
 563 [AC_MSG_CHECKING([if Linux was built with symbol $1 exported])
 564 grep -q -E '[[[:space:]]]$1[[[:space:]]]' $LINUX_OBJ/$SYMVERFILE 2>/dev/null
 565 rc=$?
 566 if test $rc -ne 0; then
 567         export=0
 568         for file in $2; do
 569                 grep -q -E "EXPORT_SYMBOL.*\($1\)" "$LINUX/$file" 2>/dev/null
 570                 rc=$?
 571                 if test $rc -eq 0; then
 572                         export=1
 573                         break;
 574                 fi
 575         done
 576         if test $export -eq 0; then
 577                 AC_MSG_RESULT([no])
 578                 $4
 579         else
 580                 AC_MSG_RESULT([yes])
 581                 $3
 582         fi
 583 else
 584         AC_MSG_RESULT([yes])
 585         $3
 586 fi
 587 ])
 588
 589 #
 590 # Like AC_CHECK_HEADER but checks for a kernel-space header
 591 #
 592 m4_define([LB_CHECK_LINUX_HEADER],
 593 [AS_VAR_PUSHDEF([ac_Header], [ac_cv_header_$1])dnl
 594 AC_CACHE_CHECK([for $1], ac_Header,
 595                [LB_LINUX_COMPILE_IFELSE([LB_LANG_PROGRAM([@%:@include <$1>])],
 596                                   [modules],
 597                                   [test -s build/conftest.o],
 598                                   [AS_VAR_SET(ac_Header, [yes])],
 599                                   [AS_VAR_SET(ac_Header, [no])])])
 600 AS_IF([test AS_VAR_GET(ac_Header) = yes], [$2], [$3])[]dnl
 601 AS_VAR_POPDEF([ac_Header])dnl
 602 ])
 603
 604 #
 605 # LB_USES_DPKG
 606 #
 607 # Determine if the target is a dpkg system or rpm
 608 #
 609 AC_DEFUN([LB_USES_DPKG],
 610 [
 611 AC_MSG_CHECKING([if this distro uses dpkg])
 612 case `lsb_release -i -s 2>/dev/null` in
 613         Ubuntu | Debian)
 614                 AC_MSG_RESULT([yes])
 615                 uses_dpkg=yes
 616                 ;;
 617         *)
 618                 AC_MSG_RESULT([no])
 619                 uses_dpkg=no
 620                 ;;
 621 esac
 622 ])