fence-agents/configure.ac - actifio - Git at Google

 # Process this file with autoconf to produce a configure script.

 AC_PREREQ([2.63])

 AC_INIT([fence-agents],
 	m4_esyscmd([make/git-version-gen .tarball-version]),
 	[linux-cluster@redhat.com])

 AM_INIT_AUTOMAKE([-Wno-portability dist-bzip2 dist-xz])

 LT_PREREQ([2.2.6])
 LT_INIT

 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([fence/agents/lib/fencing.py.py])
 AC_CONFIG_HEADERS([make/clusterautoconfig.h])

 AC_CANONICAL_HOST
 AC_PROG_LIBTOOL

 AC_LANG([C])

 # Sanitize path

 if test "$prefix" = "NONE"; then
 	prefix="/usr"
 	if test "$localstatedir" = "\${prefix}/var"; then
 		localstatedir="/var"
 	fi
 	if test "$sysconfdir" = "\${prefix}/etc"; then
 		sysconfdir="/etc"
 	fi
 	if test "$libdir" = "\${exec_prefix}/lib"; then
 		if test -e /usr/lib64; then
 			libdir="/usr/lib64"
 		else
 			libdir="/usr/lib"
 		fi
 	fi
 fi

 case $exec_prefix in
   NONE)   exec_prefix=$prefix;;
   prefix) exec_prefix=$prefix;;
 esac

 # Checks for programs.

 # check stolen from gnulib/m4/gnu-make.m4
 if ! ${MAKE-make} --version /cannot/make/this >/dev/null 2>&1; then
 	AC_MSG_ERROR([you don't seem to have GNU make; it is required])
 fi

 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_LN_S
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_AWK
 AC_PROG_CXX
 AC_PROG_RANLIB

 ## local helper functions

 # this function checks if CC support options passed as
 # args. Global CFLAGS are ignored during this test.
 cc_supports_flag() {
 	local CFLAGS="$@"
 	AC_MSG_CHECKING([whether $CC supports "$@"])
 	AC_COMPILE_IFELSE([int main(){return 0;}] ,
 			  [RC=0; AC_MSG_RESULT([yes])],
 			  [RC=1; AC_MSG_RESULT([no])])
 	return $RC
 }

 # this function tests if a library has a certain function
 # by using AC_CHECK_LIB but restores the original LIBS global
 # envvar. This is required to avoid libtool to link everything
 # with everything.
 check_lib_no_libs() {
 	AC_CHECK_LIB([$1], [$2],,
 		     [AC_MSG_ERROR([Unable to find $1 library])])
 	LIBS=$ac_check_lib_save_LIBS
 }

 # Checks for header files.
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h libintl.h limits.h netdb.h stddef.h sys/socket.h sys/time.h syslog.h])

 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_TYPE_UINT32_T

 # Checks for library functions.
 AC_FUNC_FORK
 AC_FUNC_MALLOC
 AC_CHECK_FUNCS([alarm atexit bzero dup2 memmove memset select socket strcasecmp strchr strdup strerror strtol])

 # local options
 AC_ARG_ENABLE([debug],
 	[  --enable-debug          enable debug build. ],
 	[ default="no" ])

 AC_ARG_WITH([fenceagentslibdir],
 	[  --with-fenceagentslibdir=PATH
                           installation path for fence library. ],
 	[ FENCEAGENTSLIBDIR="$withval" ],
 	[ FENCEAGENTSLIBDIR="${datadir}/fence" ])

 AC_ARG_WITH([snmpbin],
 	[  --with-snmpbin=PATH
                           path to snmp binaries (snmpwalk/get). ],
 	[ SNMPBIN="$withval" ],
 	[ SNMPBIN="${bindir}" ])

 AC_ARG_WITH([default-config-dir],
 	[  --with-default-config-dir=DIR
 			  cluster config directory. ],
 	[ DEFAULT_CONFIG_DIR="$withval" ],
 	[ DEFAULT_CONFIG_DIR="$sysconfdir/cluster" ])

 AC_ARG_WITH([default-config-file],
 	[  --with-default-config-file=FILE
 			  cluster config file. ],
 	[ DEFAULT_CONFIG_FILE="$withval" ],
 	[ DEFAULT_CONFIG_FILE="cluster.conf" ])

 AC_ARG_WITH([agents],
 	[  --with-agents=LIST
                           list of agents to build/ship (default: all). ],
 	[ AGENTS_LIST="$withval" ],
 	[ AGENTS_LIST="all" ])

 if test "x$AGENTS_LIST" = x; then
 	AC_ERROR([No agents selected])
 fi

 if test "x$AGENTS_LIST" != xall; then
 	for j in $AGENTS_LIST; do
 		if ! test -d fence/agents/$j; then
 			AC_ERROR([Agent $j does not exists])
 		fi
 	done
 fi

 if test "x$AGENTS_LIST" = xall; then
 	AGENTS_LIST=`find $srcdir/fence/agents -mindepth 2 -maxdepth 2 -name Makefile.am -printf '%h ' | sed -e 's#'$srcdir'/fence/agents/##g' -e 's#lib ##g' -e 's#nss_wrapper ##g'`
 fi

 XENAPILIB=0
 if echo "$AGENTS_LIST" | grep -q xenapi; then
 	XENAPILIB=1
 fi

 ## random vars

 LOGDIR=${localstatedir}/log/cluster
 CLUSTERVARRUN=${localstatedir}/run/cluster
 CLUSTERDATA=${datadir}/cluster

 ## path to 3rd-party binaries
 AC_PATH_PROG([IPMITOOL_PATH], [ipmitool], [/usr/bin/ipmitool])
 AC_PATH_PROG([AMTTOOL_PATH], [amttool], [/usr/bin/amttool])
 AC_PATH_PROG([GNUTLSCLI_PATH], [gnutlscli], [/usr/bin/gnutls-cli])
 AC_PATH_PROG([COROSYNC_CMAPCTL_PATH], [corosync-cmapctl], [/usr/sbin/corosync-cmapctl])
 AC_PATH_PROG([SG_PERSIST_PATH], [sg_persist], [/usr/bin/sg_persist])
 AC_PATH_PROG([SG_TURS_PATH], [sg_turs], [/usr/bin/sg_turs])
 AC_PATH_PROG([VGS_PATH], [vgs], [/usr/sbin/vgs])
 AC_PATH_PROG([SUDO_PATH], [sudo], [/usr/bin/sudo])
 AC_PATH_PROG([SSH_PATH], [ssh], [/usr/bin/ssh])
 AC_PATH_PROG([TELNET_PATH], [telnet], [/usr/bin/telnet])
 AC_PATH_PROG([MPATH_PATH], [mpathpersist], [/usr/sbin/mpathpersist])
 AC_PATH_PROG([SUDO_PATH], [sudo], [/usr/bin/sudo])

 ## do subst

 AC_SUBST([DEFAULT_CONFIG_DIR])
 AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_DIR], "$(eval echo ${DEFAULT_CONFIG_DIR})",
 		   [Default config directory])

 AC_SUBST([DEFAULT_CONFIG_FILE])
 AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_FILE], "$(eval echo ${DEFAULT_CONFIG_FILE})",
 		   [Default config file])

 AC_SUBST([LOGDIR])
 AC_DEFINE_UNQUOTED([LOGDIR], "$(eval echo ${LOGDIR})",
 		   [Default logging directory])

 AC_SUBST([CLUSTERVARRUN])
 AC_DEFINE_UNQUOTED([CLUSTERVARRUN], "$(eval echo ${CLUSTERVARRUN})",
 		   [Default cluster var/run directory])

 AC_SUBST([CLUSTERDATA])
 AC_SUBST([FENCEAGENTSLIBDIR])
 AC_SUBST([SNMPBIN])
 AC_SUBST([AGENTS_LIST])
 AM_CONDITIONAL(BUILD_XENAPILIB, test $XENAPILIB -eq 1)

 AC_SUBST([IPMITOOL_PATH])
 AC_SUBST([AMTTOOL_PATH])
 AC_SUBST([COROSYNC_CMAPCTL_PATH])
 AC_SUBST([SG_PERSIST_PATH])
 AC_SUBST([SG_TURS_PATH])
 AC_SUBST([VGS_PATH])

 ## *FLAGS handling

 ENV_CFLAGS="$CFLAGS"
 ENV_CPPFLAGS="$CPPFLAGS"
 ENV_LDFLAGS="$LDFLAGS"

 # debug build stuff
 if test "x${enable_debug}" = xyes; then
 	AC_DEFINE_UNQUOTED([DEBUG], [1], [Compiling Debugging code])
 	OPT_CFLAGS="-O0"
 else
 	OPT_CFLAGS="-O2"
 fi

 # gdb flags
 if test "x${GCC}" = xyes; then
 	GDB_FLAGS="-ggdb3"
 else
 	GDB_FLAGS="-g"
 fi

 # extra warnings
 EXTRA_WARNINGS=""

 WARNLIST="
 	all
 	shadow
 	missing-prototypes
 	missing-declarations
 	strict-prototypes
 	declaration-after-statement
 	pointer-arith
 	write-strings
 	cast-align
 	bad-function-cast
 	missing-format-attribute
 	format=2
 	format-security
 	format-nonliteral
 	no-long-long
 	unsigned-char
 	gnu89-inline
 	no-strict-aliasing
 	"

 for j in $WARNLIST; do
 	if cc_supports_flag -W$j; then
 		EXTRA_WARNINGS="$EXTRA_WARNINGS -W$j";
 	fi
 done

 CFLAGS="$ENV_CFLAGS $OPT_CFLAGS $GDB_FLAGS \
 	$EXTRA_WARNINGS $WERROR_CFLAGS"
 CPPFLAGS="-I\$(top_builddir)/make -I\$(top_srcdir)/make -I. $ENV_CPPFLAGS"
 LDFLAGS="$ENV_LDFLAGS"


 AC_CONFIG_FILES([Makefile
 		 fence/Makefile
 		 fence/agents/Makefile
 		 fence/agents/alom/Makefile
 		 fence/agents/apc/Makefile
 		 fence/agents/apc_snmp/Makefile
 		 fence/agents/amt/Makefile
 		 fence/agents/bladecenter/Makefile
 		 fence/agents/brocade/Makefile
 		 fence/agents/cisco_mds/Makefile
 		 fence/agents/cisco_ucs/Makefile
 		 fence/agents/docker/Makefile
 		 fence/agents/drac/Makefile
 		 fence/agents/drac5/Makefile
 		 fence/agents/dummy/Makefile
 		 fence/agents/eaton_snmp/Makefile
 		 fence/agents/egenera/Makefile
 		 fence/agents/emerson/Makefile
 		 fence/agents/eps/Makefile
 		 fence/agents/hpblade/Makefile
 		 fence/agents/ibmblade/Makefile
 		 fence/agents/ipdu/Makefile
 		 fence/agents/ifmib/Makefile
 		 fence/agents/ilo/Makefile
 		 fence/agents/ilo_moonshot/Makefile
 		 fence/agents/ilo_mp/Makefile
 		 fence/agents/ilo_ssh/Makefile
 		 fence/agents/intelmodular/Makefile
 		 fence/agents/ipmilan/Makefile
 		 fence/agents/ipmilan_actifio/Makefile
 		 fence/agents/kdump/Makefile
 		 fence/agents/ldom/Makefile
 		 fence/agents/lib/Makefile
 		 fence/agents/lpar/Makefile
 		 fence/agents/manual/Makefile
 		 fence/agents/mpath/Makefile
 		 fence/agents/netio/Makefile
 		 fence/agents/ovh/Makefile
 		 fence/agents/pve/Makefile
 		 fence/agents/raritan/Makefile
 		 fence/agents/rhevm/Makefile
 		 fence/agents/rsa/Makefile
 		 fence/agents/rsb/Makefile
 		 fence/agents/sanbox2/Makefile
 		 fence/agents/scsi/Makefile
 		 fence/agents/virsh/Makefile
 		 fence/agents/vmware/Makefile
 		 fence/agents/vmware_soap/Makefile
 		 fence/agents/wti/Makefile
 		 fence/agents/xenapi/Makefile
 		 fence/agents/hds_cb/Makefile
 		 fence/agents/zvm/Makefile
 		 doc/Makefile])

 AC_OUTPUT
	# Process this file with autoconf to produce a configure script.

	AC_PREREQ([2.63])

	AC_INIT([fence-agents],
	m4_esyscmd([make/git-version-gen .tarball-version]),
	[linux-cluster@redhat.com])

	AM_INIT_AUTOMAKE([-Wno-portability dist-bzip2 dist-xz])

	LT_PREREQ([2.2.6])
	LT_INIT

	AC_CONFIG_MACRO_DIR([m4])
	AC_CONFIG_SRCDIR([fence/agents/lib/fencing.py.py])
	AC_CONFIG_HEADERS([make/clusterautoconfig.h])

	AC_CANONICAL_HOST
	AC_PROG_LIBTOOL

	AC_LANG([C])

	# Sanitize path

	if test "$prefix" = "NONE"; then
	prefix="/usr"
	if test "$localstatedir" = "\${prefix}/var"; then
	localstatedir="/var"
	fi
	if test "$sysconfdir" = "\${prefix}/etc"; then
	sysconfdir="/etc"
	fi
	if test "$libdir" = "\${exec_prefix}/lib"; then
	if test -e /usr/lib64; then
	libdir="/usr/lib64"
	else
	libdir="/usr/lib"
	fi
	fi
	fi

	case $exec_prefix in
	NONE) exec_prefix=$prefix;;
	prefix) exec_prefix=$prefix;;
	esac

	# Checks for programs.

	# check stolen from gnulib/m4/gnu-make.m4
	if ! ${MAKE-make} --version /cannot/make/this >/dev/null 2>&1; then
	AC_MSG_ERROR([you don't seem to have GNU make; it is required])
	fi

	AC_PROG_CC
	AM_PROG_CC_C_O
	AC_PROG_LN_S
	AC_PROG_INSTALL
	AC_PROG_MAKE_SET
	AC_PROG_AWK
	AC_PROG_CXX
	AC_PROG_RANLIB

	## local helper functions

	# this function checks if CC support options passed as
	# args. Global CFLAGS are ignored during this test.
	cc_supports_flag() {
	local CFLAGS="$@"
	AC_MSG_CHECKING([whether $CC supports "$@"])
	AC_COMPILE_IFELSE([int main(){return 0;}] ,
	[RC=0; AC_MSG_RESULT([yes])],
	[RC=1; AC_MSG_RESULT([no])])
	return $RC
	}

	# this function tests if a library has a certain function
	# by using AC_CHECK_LIB but restores the original LIBS global
	# envvar. This is required to avoid libtool to link everything
	# with everything.
	check_lib_no_libs() {
	AC_CHECK_LIB([$1], [$2],,
	[AC_MSG_ERROR([Unable to find $1 library])])
	LIBS=$ac_check_lib_save_LIBS
	}

	# Checks for header files.
	AC_CHECK_HEADERS([arpa/inet.h fcntl.h libintl.h limits.h netdb.h stddef.h sys/socket.h sys/time.h syslog.h])

	# Checks for typedefs, structures, and compiler characteristics.
	AC_C_INLINE
	AC_TYPE_SIZE_T
	AC_TYPE_SSIZE_T
	AC_TYPE_UINT32_T

	# Checks for library functions.
	AC_FUNC_FORK
	AC_FUNC_MALLOC
	AC_CHECK_FUNCS([alarm atexit bzero dup2 memmove memset select socket strcasecmp strchr strdup strerror strtol])

	# local options
	AC_ARG_ENABLE([debug],
	[ --enable-debug enable debug build. ],
	[ default="no" ])

	AC_ARG_WITH([fenceagentslibdir],
	[ --with-fenceagentslibdir=PATH
	installation path for fence library. ],
	[ FENCEAGENTSLIBDIR="$withval" ],
	[ FENCEAGENTSLIBDIR="${datadir}/fence" ])

	AC_ARG_WITH([snmpbin],
	[ --with-snmpbin=PATH
	path to snmp binaries (snmpwalk/get). ],
	[ SNMPBIN="$withval" ],
	[ SNMPBIN="${bindir}" ])

	AC_ARG_WITH([default-config-dir],
	[ --with-default-config-dir=DIR
	cluster config directory. ],
	[ DEFAULT_CONFIG_DIR="$withval" ],
	[ DEFAULT_CONFIG_DIR="$sysconfdir/cluster" ])

	AC_ARG_WITH([default-config-file],
	[ --with-default-config-file=FILE
	cluster config file. ],
	[ DEFAULT_CONFIG_FILE="$withval" ],
	[ DEFAULT_CONFIG_FILE="cluster.conf" ])

	AC_ARG_WITH([agents],
	[ --with-agents=LIST
	list of agents to build/ship (default: all). ],
	[ AGENTS_LIST="$withval" ],
	[ AGENTS_LIST="all" ])

	if test "x$AGENTS_LIST" = x; then
	AC_ERROR([No agents selected])
	fi

	if test "x$AGENTS_LIST" != xall; then
	for j in $AGENTS_LIST; do
	if ! test -d fence/agents/$j; then
	AC_ERROR([Agent $j does not exists])
	fi
	done
	fi

	if test "x$AGENTS_LIST" = xall; then
	AGENTS_LIST=`find $srcdir/fence/agents -mindepth 2 -maxdepth 2 -name Makefile.am -printf '%h ' \| sed -e 's#'$srcdir'/fence/agents/##g' -e 's#lib ##g' -e 's#nss_wrapper ##g'`
	fi

	XENAPILIB=0
	if echo "$AGENTS_LIST" \| grep -q xenapi; then
	XENAPILIB=1
	fi

	## random vars

	LOGDIR=${localstatedir}/log/cluster
	CLUSTERVARRUN=${localstatedir}/run/cluster
	CLUSTERDATA=${datadir}/cluster

	## path to 3rd-party binaries
	AC_PATH_PROG([IPMITOOL_PATH], [ipmitool], [/usr/bin/ipmitool])
	AC_PATH_PROG([AMTTOOL_PATH], [amttool], [/usr/bin/amttool])
	AC_PATH_PROG([GNUTLSCLI_PATH], [gnutlscli], [/usr/bin/gnutls-cli])
	AC_PATH_PROG([COROSYNC_CMAPCTL_PATH], [corosync-cmapctl], [/usr/sbin/corosync-cmapctl])
	AC_PATH_PROG([SG_PERSIST_PATH], [sg_persist], [/usr/bin/sg_persist])
	AC_PATH_PROG([SG_TURS_PATH], [sg_turs], [/usr/bin/sg_turs])
	AC_PATH_PROG([VGS_PATH], [vgs], [/usr/sbin/vgs])
	AC_PATH_PROG([SUDO_PATH], [sudo], [/usr/bin/sudo])
	AC_PATH_PROG([SSH_PATH], [ssh], [/usr/bin/ssh])
	AC_PATH_PROG([TELNET_PATH], [telnet], [/usr/bin/telnet])
	AC_PATH_PROG([MPATH_PATH], [mpathpersist], [/usr/sbin/mpathpersist])
	AC_PATH_PROG([SUDO_PATH], [sudo], [/usr/bin/sudo])

	## do subst

	AC_SUBST([DEFAULT_CONFIG_DIR])
	AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_DIR], "$(eval echo ${DEFAULT_CONFIG_DIR})",
	[Default config directory])

	AC_SUBST([DEFAULT_CONFIG_FILE])
	AC_DEFINE_UNQUOTED([DEFAULT_CONFIG_FILE], "$(eval echo ${DEFAULT_CONFIG_FILE})",
	[Default config file])

	AC_SUBST([LOGDIR])
	AC_DEFINE_UNQUOTED([LOGDIR], "$(eval echo ${LOGDIR})",
	[Default logging directory])

	AC_SUBST([CLUSTERVARRUN])
	AC_DEFINE_UNQUOTED([CLUSTERVARRUN], "$(eval echo ${CLUSTERVARRUN})",
	[Default cluster var/run directory])

	AC_SUBST([CLUSTERDATA])
	AC_SUBST([FENCEAGENTSLIBDIR])
	AC_SUBST([SNMPBIN])
	AC_SUBST([AGENTS_LIST])
	AM_CONDITIONAL(BUILD_XENAPILIB, test $XENAPILIB -eq 1)

	AC_SUBST([IPMITOOL_PATH])
	AC_SUBST([AMTTOOL_PATH])
	AC_SUBST([COROSYNC_CMAPCTL_PATH])
	AC_SUBST([SG_PERSIST_PATH])
	AC_SUBST([SG_TURS_PATH])
	AC_SUBST([VGS_PATH])

	## *FLAGS handling

	ENV_CFLAGS="$CFLAGS"
	ENV_CPPFLAGS="$CPPFLAGS"
	ENV_LDFLAGS="$LDFLAGS"

	# debug build stuff
	if test "x${enable_debug}" = xyes; then
	AC_DEFINE_UNQUOTED([DEBUG], [1], [Compiling Debugging code])
	OPT_CFLAGS="-O0"
	else
	OPT_CFLAGS="-O2"
	fi

	# gdb flags
	if test "x${GCC}" = xyes; then
	GDB_FLAGS="-ggdb3"
	else
	GDB_FLAGS="-g"
	fi

	# extra warnings
	EXTRA_WARNINGS=""

	WARNLIST="
	all
	shadow
	missing-prototypes
	missing-declarations
	strict-prototypes
	declaration-after-statement
	pointer-arith
	write-strings
	cast-align
	bad-function-cast
	missing-format-attribute
	format=2
	format-security
	format-nonliteral
	no-long-long
	unsigned-char
	gnu89-inline
	no-strict-aliasing
	"

	for j in $WARNLIST; do
	if cc_supports_flag -W$j; then
	EXTRA_WARNINGS="$EXTRA_WARNINGS -W$j";
	fi
	done

	CFLAGS="$ENV_CFLAGS $OPT_CFLAGS $GDB_FLAGS \
	$EXTRA_WARNINGS $WERROR_CFLAGS"
	CPPFLAGS="-I\$(top_builddir)/make -I\$(top_srcdir)/make -I. $ENV_CPPFLAGS"
	LDFLAGS="$ENV_LDFLAGS"


	AC_CONFIG_FILES([Makefile
	fence/Makefile
	fence/agents/Makefile
	fence/agents/alom/Makefile
	fence/agents/apc/Makefile
	fence/agents/apc_snmp/Makefile
	fence/agents/amt/Makefile
	fence/agents/bladecenter/Makefile
	fence/agents/brocade/Makefile
	fence/agents/cisco_mds/Makefile
	fence/agents/cisco_ucs/Makefile
	fence/agents/docker/Makefile
	fence/agents/drac/Makefile
	fence/agents/drac5/Makefile
	fence/agents/dummy/Makefile
	fence/agents/eaton_snmp/Makefile
	fence/agents/egenera/Makefile
	fence/agents/emerson/Makefile
	fence/agents/eps/Makefile
	fence/agents/hpblade/Makefile
	fence/agents/ibmblade/Makefile
	fence/agents/ipdu/Makefile
	fence/agents/ifmib/Makefile
	fence/agents/ilo/Makefile
	fence/agents/ilo_moonshot/Makefile
	fence/agents/ilo_mp/Makefile
	fence/agents/ilo_ssh/Makefile
	fence/agents/intelmodular/Makefile
	fence/agents/ipmilan/Makefile
	fence/agents/ipmilan_actifio/Makefile
	fence/agents/kdump/Makefile
	fence/agents/ldom/Makefile
	fence/agents/lib/Makefile
	fence/agents/lpar/Makefile
	fence/agents/manual/Makefile
	fence/agents/mpath/Makefile
	fence/agents/netio/Makefile
	fence/agents/ovh/Makefile
	fence/agents/pve/Makefile
	fence/agents/raritan/Makefile
	fence/agents/rhevm/Makefile
	fence/agents/rsa/Makefile
	fence/agents/rsb/Makefile
	fence/agents/sanbox2/Makefile
	fence/agents/scsi/Makefile
	fence/agents/virsh/Makefile
	fence/agents/vmware/Makefile
	fence/agents/vmware_soap/Makefile
	fence/agents/wti/Makefile
	fence/agents/xenapi/Makefile
	fence/agents/hds_cb/Makefile
	fence/agents/zvm/Makefile
	doc/Makefile])

	AC_OUTPUT