[urcu.git] / configure.ac

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


AC_INIT([userspace-rcu],[0.6.7],[mathieu dot desnoyers at efficios dot com])

# Following the numbering scheme proposed by libtool for the library version
# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0])

AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([config])
AC_CANONICAL_TARGET
AC_CANONICAL_HOST
AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

AC_CONFIG_SRCDIR([urcu.h])

AC_CONFIG_HEADERS([config.h urcu/config.h])

AH_TEMPLATE([CONFIG_RCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])

# Checks for programs.
AC_PROG_CC
AC_PROG_MAKE_SET
LT_INIT

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

# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_MMAP
AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])

# Find arch type
AS_CASE([$host_cpu],
	[i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
	[i486], [ARCHTYPE="x86"],
	[i586], [ARCHTYPE="x86"],
	[i686], [ARCHTYPE="x86"],
	[amd64], [ARCHTYPE="x86"],
	[x86_64], [ARCHTYPE="x86"],
	[powerpc], [ARCHTYPE="ppc"],
	[ppc64], [ARCHTYPE="ppc"],
	[powerpc64], [ARCHTYPE="ppc"],
	[ppc], [ARCHTYPE="ppc"],
	[s390], [ARCHTYPE="s390"],
	[s390x], [ARCHTYPE="s390"],
	[sparc64], [ARCHTYPE="sparc64"],
	[alpha*], [ARCHTYPE="alpha"],
	[ia64], [ARCHTYPE="gcc"],
	[arm*], [ARCHTYPE="arm"],
	[ARCHTYPE="unknown"]
)

AC_SUBST(ARCHTYPE)
AC_SUBST(SUBARCHTYPE)

UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
ARCHSRC=urcu/arch/$ARCHTYPE.h

AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
	AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
])

AS_IF([test "$host_cpu" = "armv7l"],[
	CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
])

# ARM-specific checks
AS_IF([test "x$ARCHTYPE" = "xarm"],[
	AC_MSG_CHECKING([for dmb instruction])
	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]], [[asm volatile("dmb":::"memory");]])],[
		AC_MSG_RESULT([yes])
		AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
	],[
		AC_MSG_RESULT([no])
	])
])

# x86-specific checks
AS_IF([test "x$ARCHTYPE" = "xx86"],[
	AC_MSG_CHECKING([if architecture really supports the mfence instruction])
	#For now, using lock; addl compatibility mode even for i686, because the
	#Pentium III is seen as a i686, but lacks mfence instruction.
	#Only using fence for x86_64.
	AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
		AC_MSG_RESULT([yes])
		AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
	],[
		AC_MSG_RESULT([no])
	])
])

# Check if sys_futex() is available
AC_MSG_CHECKING([for sys_futex()])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
		#include <sys/syscall.h>
	]],[[
		#ifndef __NR_futex
		#error "futexes not available"
		#endif
	]])
],[
	AC_MSG_RESULT([yes])
	AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
	compat_futex_test=0
],[
	AC_MSG_RESULT([no])
	compat_futex_test=1
])

AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])

# smp-support configure option
AC_ARG_ENABLE([smp-support], 
	AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
	[def_smp_support=$enableval],
	[def_smp_support="yes"])
AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])


# From the sched_setaffinity(2)'s man page:
# ~~~~
# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
# The library interfaces were introduced in glibc 2.3.  Initially, the
# glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
# the cpuset size argument was removed, but this argument was
# restored in glibc 2.3.4.
# ~~~~

# In addition to that, some vendors ported the system call to 2.4
# kernels.

# Furthermore, when the function first appeared, the MASK argument was
# an unsigned long pointer, while later it was made into a cpu_set_t
# pointer.  Systems that have the cpu_set_t version also should have
# the CPU_ZERO, CPU_SET, etc. macros.

# All this mess means we have to cater for at least 3 different
# sched_setaffinity prototypes:

# ~~~~
#  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
#  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
#  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
# ~~~~

# Since we define _GNU_SOURCE in the sources, must do so too in the
# autoconf tests, as defining _GNU_SOURCE or not exposes
# sched_setaffinity bits differently.
saved_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS -D_GNU_SOURCE"

# First check if the function is available at all.
AC_CHECK_FUNCS([sched_setaffinity],[
	# Okay, we have it.  Check if also have cpu_set_t.  If we don't,
	# then we have the first version using unsigned long, and no
	# CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
	# version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
	# should also be present, but we confirm nonetheless.

	AC_CHECK_TYPES([cpu_set_t],[
		# We do have it.  Confirm that we have CPU_ZERO, and it actually works.
		AC_MSG_CHECKING([whether CPU_ZERO works])
		AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
				#define _GNU_SOURCE
				#include <sched.h>
			]],[[
				cpu_set_t foo; CPU_ZERO (&foo);
			]])
		],[
			# Works!
			AC_DEFINE(HAVE_CPU_ZERO, 1)
			AC_MSG_RESULT([yes])
		],[
			AC_MSG_RESULT([no])
		])

		# Check how many arguments does sched_setaffinity take.
		# Should be 3 or 2.
		AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
				#include <sched.h>
			]],[[
				cpu_set_t foo;
				sched_setaffinity (0, sizeof (foo), &foo);
			]])
		],
		[sched_set_affinity_args=3],
		[sched_set_affinity_args=2])
		AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
			[Defined to sched_setaffinity's number of arguments.])
		AC_MSG_RESULT([$sched_set_affinity_args])
	],[
		# No cpu_set_t, always 3 args.
		AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
    	],
    	[#include <sched.h>])
])

CFLAGS=$saved_CFLAGS

AC_CONFIG_LINKS([
	urcu/arch.h:$ARCHSRC
	urcu/uatomic.h:$UATOMICSRC
])
AC_CONFIG_FILES([
	Makefile
	tests/Makefile
	liburcu.pc
	liburcu-bp.pc
	liburcu-cds.pc
	liburcu-qsbr.pc
	liburcu-mb.pc
	liburcu-signal.pc
])
AC_OUTPUT

# Report on selected configure options
AS_IF([test "x$def_smp_support" = "xyes"],[
	AS_ECHO("SMP support enabled.")
],[
	AS_ECHO("SMP support disabled.")
])
Commit	Line	Data
	1	# -- Autoconf --
	2	# Process this file with autoconf to produce a configure script.
	3
	4
	5	AC_INIT([userspace-rcu],[0.6.7],[mathieu dot desnoyers at efficios dot com])
	6
	7	# Following the numbering scheme proposed by libtool for the library version
	8	# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
	9	AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0])
	10
	11	AC_CONFIG_AUX_DIR([config])
	12	AC_CONFIG_MACRO_DIR([config])
	13	AC_CANONICAL_TARGET
	14	AC_CANONICAL_HOST
	15	AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
	16	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
	17
	18	AC_CONFIG_SRCDIR([urcu.h])
	19
	20	AC_CONFIG_HEADERS([config.h urcu/config.h])
	21
	22	AH_TEMPLATE([CONFIG_RCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
	23	AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
	24	AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
	25	AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
	26	AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
	27
	28	# Checks for programs.
	29	AC_PROG_CC
	30	AC_PROG_MAKE_SET
	31	LT_INIT
	32
	33	# Checks for typedefs, structures, and compiler characteristics.
	34	AC_C_INLINE
	35	AC_TYPE_PID_T
	36	AC_TYPE_SIZE_T
	37
	38	# Checks for library functions.
	39	AC_FUNC_MALLOC
	40	AC_FUNC_MMAP
	41	AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
	42
	43	# Find arch type
	44	AS_CASE([$host_cpu],
	45	[i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
	46	[i486], [ARCHTYPE="x86"],
	47	[i586], [ARCHTYPE="x86"],
	48	[i686], [ARCHTYPE="x86"],
	49	[amd64], [ARCHTYPE="x86"],
	50	[x86_64], [ARCHTYPE="x86"],
	51	[powerpc], [ARCHTYPE="ppc"],
	52	[ppc64], [ARCHTYPE="ppc"],
	53	[powerpc64], [ARCHTYPE="ppc"],
	54	[ppc], [ARCHTYPE="ppc"],
	55	[s390], [ARCHTYPE="s390"],
	56	[s390x], [ARCHTYPE="s390"],
	57	[sparc64], [ARCHTYPE="sparc64"],
	58	[alpha*], [ARCHTYPE="alpha"],
	59	[ia64], [ARCHTYPE="gcc"],
	60	[arm*], [ARCHTYPE="arm"],
	61	[ARCHTYPE="unknown"]
	62	)
	63
	64	AC_SUBST(ARCHTYPE)
	65	AC_SUBST(SUBARCHTYPE)
	66
	67	UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
	68	ARCHSRC=urcu/arch/$ARCHTYPE.h
	69
	70	AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
	71	AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
	72	])
	73
	74	AS_IF([test "$host_cpu" = "armv7l"],[
	75	CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
	76	])
	77
	78	# ARM-specific checks
	79	AS_IF([test "x$ARCHTYPE" = "xarm"],[
	80	AC_MSG_CHECKING([for dmb instruction])
	81	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]], [[asm volatile("dmb":::"memory");]])],[
	82	AC_MSG_RESULT([yes])
	83	AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
	84	],[
	85	AC_MSG_RESULT([no])
	86	])
	87	])
	88
	89	# x86-specific checks
	90	AS_IF([test "x$ARCHTYPE" = "xx86"],[
	91	AC_MSG_CHECKING([if architecture really supports the mfence instruction])
	92	#For now, using lock; addl compatibility mode even for i686, because the
	93	#Pentium III is seen as a i686, but lacks mfence instruction.
	94	#Only using fence for x86_64.
	95	AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
	96	AC_MSG_RESULT([yes])
	97	AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
	98	],[
	99	AC_MSG_RESULT([no])
	100	])
	101	])
	102
	103	# Check if sys_futex() is available
	104	AC_MSG_CHECKING([for sys_futex()])
	105	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	106	#include <sys/syscall.h>
	107	]],[[
	108	#ifndef __NR_futex
	109	#error "futexes not available"
	110	#endif
	111	]])
	112	],[
	113	AC_MSG_RESULT([yes])
	114	AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
	115	compat_futex_test=0
	116	],[
	117	AC_MSG_RESULT([no])
	118	compat_futex_test=1
	119	])
	120
	121	AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
	122	AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
	123
	124	# smp-support configure option
	125	AC_ARG_ENABLE([smp-support],
	126	AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
	127	[def_smp_support=$enableval],
	128	[def_smp_support="yes"])
	129	AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
	130
	131
	132	# From the sched_setaffinity(2)'s man page:
	133	# ~~~~
	134	# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
	135	# The library interfaces were introduced in glibc 2.3. Initially, the
	136	# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
	137	# the cpuset size argument was removed, but this argument was
	138	# restored in glibc 2.3.4.
	139	# ~~~~
	140
	141	# In addition to that, some vendors ported the system call to 2.4
	142	# kernels.
	143
	144	# Furthermore, when the function first appeared, the MASK argument was
	145	# an unsigned long pointer, while later it was made into a cpu_set_t
	146	# pointer. Systems that have the cpu_set_t version also should have
	147	# the CPU_ZERO, CPU_SET, etc. macros.
	148
	149	# All this mess means we have to cater for at least 3 different
	150	# sched_setaffinity prototypes:
	151
	152	# ~~~~
	153	# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
	154	# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
	155	# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
	156	# ~~~~
	157
	158	# Since we define _GNU_SOURCE in the sources, must do so too in the
	159	# autoconf tests, as defining _GNU_SOURCE or not exposes
	160	# sched_setaffinity bits differently.
	161	saved_CFLAGS=$CFLAGS
	162	CFLAGS="$CFLAGS -D_GNU_SOURCE"
	163
	164	# First check if the function is available at all.
	165	AC_CHECK_FUNCS([sched_setaffinity],[
	166	# Okay, we have it. Check if also have cpu_set_t. If we don't,
	167	# then we have the first version using unsigned long, and no
	168	# CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
	169	# version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
	170	# should also be present, but we confirm nonetheless.
	171
	172	AC_CHECK_TYPES([cpu_set_t],[
	173	# We do have it. Confirm that we have CPU_ZERO, and it actually works.
	174	AC_MSG_CHECKING([whether CPU_ZERO works])
	175	AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
	176	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	177	#define _GNU_SOURCE
	178	#include <sched.h>
	179	]],[[
	180	cpu_set_t foo; CPU_ZERO (&foo);
	181	]])
	182	],[
	183	# Works!
	184	AC_DEFINE(HAVE_CPU_ZERO, 1)
	185	AC_MSG_RESULT([yes])
	186	],[
	187	AC_MSG_RESULT([no])
	188	])
	189
	190	# Check how many arguments does sched_setaffinity take.
	191	# Should be 3 or 2.
	192	AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
	193	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	194	#include <sched.h>
	195	]],[[
	196	cpu_set_t foo;
	197	sched_setaffinity (0, sizeof (foo), &foo);
	198	]])
	199	],
	200	[sched_set_affinity_args=3],
	201	[sched_set_affinity_args=2])
	202	AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
	203	[Defined to sched_setaffinity's number of arguments.])
	204	AC_MSG_RESULT([$sched_set_affinity_args])
	205	],[
	206	# No cpu_set_t, always 3 args.
	207	AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
	208	],
	209	[#include <sched.h>])
	210	])
	211
	212	CFLAGS=$saved_CFLAGS
	213
	214	AC_CONFIG_LINKS([
	215	urcu/arch.h:$ARCHSRC
	216	urcu/uatomic.h:$UATOMICSRC
	217	])
	218	AC_CONFIG_FILES([
	219	Makefile
	220	tests/Makefile
	221	liburcu.pc
	222	liburcu-bp.pc
	223	liburcu-cds.pc
	224	liburcu-qsbr.pc
	225	liburcu-mb.pc
	226	liburcu-signal.pc
	227	])
	228	AC_OUTPUT
	229
	230	# Report on selected configure options
	231	AS_IF([test "x$def_smp_support" = "xyes"],[
	232	AS_ECHO("SMP support enabled.")
	233	],[
	234	AS_ECHO("SMP support disabled.")
	235	])