zfs/config/kernel.m4

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2008-12-05 17:46:11 +00:00
dnl #
dnl # Default ZFS kernel configuration
dnl #
AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL
ZFS_AC_SPL
ZFS_AC_CONFIG_KERNEL_BIO_ARGS
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dnl # Kernel build make options
dnl # KERNELMAKE_PARAMS="V=1" # Enable verbose module build
KERNELMAKE_PARAMS=
dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
dnl # compiler options are added by the kernel build system.
KERNELCPPFLAGS="$KERNELCPPFLAGS -Werror -DHAVE_SPL -D_KERNEL"
KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
KERNELCPPFLAGS="$KERNELCPPFLAGS -I$TOPDIR -I$SPL -I$SPL/include"
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if test "$LINUX_OBJ" != "$LINUX"; then
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
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fi
AC_SUBST(KERNELMAKE_PARAMS)
AC_SUBST(KERNELCPPFLAGS)
])
dnl #
dnl # Detect name used more Module.symvers file
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
sourcelink=`ls -1d /usr/src/kernels/* /usr/src/linux-* \
2>/dev/null | grep -v obj | tail -1`
if test -e $sourcelink; then
kernelsrc=`readlink -f ${sourcelink}`
else
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([
*** Please specify the location of the kernel source
*** with the '--with-linux=PATH' option])
fi
else
if test "$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 ${kernelsrc}-obj; then
kernelbuild=${kernelsrc}-obj/`arch`/`arch`
elif test -d `dirname ${kernelsrc}`/build-`arch`; then
kernelbuild=`dirname ${kernelsrc}`/build-`arch`
else
kernelbuild=${kernelsrc}
fi
fi
AC_MSG_RESULT([$kernelbuild])
AC_MSG_CHECKING([kernel source version])
if test -r $kernelbuild/include/linux/version.h &&
fgrep -q UTS_RELEASE $kernelbuild/include/linux/version.h; then
kernsrcver=`(echo "#include <linux/version.h>";
echo "kernsrcver=UTS_RELEASE") |
cpp -I $kernelbuild/include |
grep "^kernsrcver=" | cut -d \" -f 2`
elif test -r $kernelbuild/include/linux/utsrelease.h &&
fgrep -q UTS_RELEASE $kernelbuild/include/linux/utsrelease.h; then
kernsrcver=`(echo "#include <linux/utsrelease.h>";
echo "kernsrcver=UTS_RELEASE") |
cpp -I $kernelbuild/include |
grep "^kernsrcver=" | cut -d \" -f 2`
fi
if test -z "$kernsrcver"; then
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([
*** Cannot determine the version of the linux kernel source.
*** Please prepare the kernel before running this script])
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
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 $SPL_OBJ/Modules.symvers; then
SPL_SYMBOLS=Modules.symvers
else
SPL_SYMBOLS=NONE
fi
AC_MSG_RESULT([$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 -e $sourcelink; then
splsrc=`readlink -f ${sourcelink}`
else
AC_MSG_RESULT([Not found])
AC_MSG_ERROR([
*** Please specify the location of the spl source
*** with the '--with-spl=PATH' option])
fi
else
if test "$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 $splsrc/spl_config.h &&
fgrep -q SPL_META_VERSION $splsrc/spl_config.h; then
splsrcver=`(echo "#include <spl_config.h>";
echo "splsrcver=SPL_META_VERSION") |
cpp -I $splsrc |
grep "^splsrcver=" | cut -d \" -f 2`
fi
if test -z "$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 # ZFS_LINUX_CONFTEST
dnl #
AC_DEFUN([ZFS_LINUX_CONFTEST], [
cat >conftest.c <<_ACEOF
$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 [$2] LINUXINCLUDE="-Iinclude -Iinclude2 -I$LINUX/include -include include/linux/autoconf.h" -o tmp_include_depends -o scripts -o include/config/MARKER -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/Module*.symvers $SPL_OBJ/Module*.symvers 2>/dev/null
rc=$?
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
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])