c9c0d073da
Add autoconf style build infrastructure to the ZFS tree. This includes autogen.sh, configure.ac, m4 macros, some scripts/*, and makefiles for all the core ZFS components.
95 lines
2.4 KiB
Plaintext
95 lines
2.4 KiB
Plaintext
dnl #
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dnl # Check for ZFS support in libblkid. This test needs to check
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dnl # more than if the library exists because we expect there are
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dnl # at least 3 flavors of the library out in the wild:
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dnl #
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dnl # 1) blkid which has no ZFS support
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dnl # 2) blkid with ZFS support and a flawed method of probing
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dnl # 3) blkid with ZFS support and a working method of probing
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dnl #
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dnl # To handle this the check first validates that there is a version
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dnl # of the library installed. If there is it creates a simulated
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dnl # ZFS filesystem and then links a small test app which attempts
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dnl # to detect the simualated filesystem type. If it correctly
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dnl # identifies the filesystem as ZFS we can safely assume case 3).
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dnl # Otherwise we disable blkid support and resort to manual probing.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_USER_LIBBLKID], [
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AC_ARG_WITH([blkid],
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[AS_HELP_STRING([--with-blkid],
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[support blkid caching @<:@default=check@:>@])],
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[],
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[with_blkid=check])
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LIBBLKID=
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AS_IF([test "x$with_blkid" != xno],
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[
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AC_CHECK_LIB([blkid], [blkid_get_cache],
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[
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AC_MSG_CHECKING([for blkid zfs support])
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ZFS_DEV=`mktemp`
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dd if=/dev/zero of=$ZFS_DEV bs=1024k count=8 \
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>/dev/null 2>/dev/null
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echo -en "\x0c\xb1\xba\0\0\0\0\0" | \
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dd of=$ZFS_DEV bs=1k count=8 \
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seek=132 conv=notrunc &>/dev/null \
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>/dev/null 2>/dev/null
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saved_LDFLAGS="$LDFLAGS"
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LDFLAGS="-lblkid"
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AC_RUN_IFELSE(AC_LANG_PROGRAM(
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[
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#include <stdio.h>
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#include <blkid/blkid.h>
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],
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[
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blkid_cache cache;
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char *value;
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if (blkid_get_cache(&cache, NULL) < 0)
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return 1;
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value = blkid_get_tag_value(cache, "TYPE",
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"$ZFS_DEV");
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if (!value) {
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blkid_put_cache(cache);
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return 2;
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}
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if (strcmp(value, "zfs")) {
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free(value);
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blkid_put_cache(cache);
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return 3;
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}
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free(value);
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blkid_put_cache(cache);
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]),
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[
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rm -f $ZFS_DEV
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AC_MSG_RESULT([yes])
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AC_SUBST([LIBBLKID], ["-lblkid"])
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AC_DEFINE([HAVE_LIBBLKID], 1,
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[Define if you have libblkid])
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],
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[
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rm -f $ZFS_DEV
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AC_MSG_RESULT([no])
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AS_IF([test "x$with_blkid" != xcheck],
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[AC_MSG_FAILURE(
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[--with-blkid given but unavailable])])
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])
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LDFLAGS="$saved_LDFLAGS"
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],
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[
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AS_IF([test "x$with_blkid" != xcheck],
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[AC_MSG_FAILURE(
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[--with-blkid given but unavailable])])
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]
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[])
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])
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])
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