[userspace-rcu.git] / configure.ac

AC_PREREQ(2.59)
AC_INIT([userspace-rcu],[0.9.2],[mathieu dot desnoyers at efficios dot com], [], [http://liburcu.org/])

# 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], [4:0:0])

AC_CONFIG_SRCDIR([urcu.h])
AC_CONFIG_HEADERS([config.h urcu/config.h])
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([m4])

AC_CANONICAL_TARGET
AC_CANONICAL_HOST

AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
AM_MAINTAINER_MODE([enable])

# Enable silent rules if available (Introduced in AM 1.11)
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

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.])
AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])

# Allow overriding storage used for TLS variables.
AC_ARG_ENABLE([compiler-tls],
	AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
	[def_compiler_tls=$enableval],
	[def_compiler_tls="yes"])

# If not overridden, use ax_tls.m4 to check if TLS is available.
AS_IF([test "x$def_compiler_tls" = "xyes"],
	[AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
	[:])

AS_IF([test "x$def_tls_detect" = "x"],
	[:],
	[AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])

# Checks for C compiler
AC_USE_SYSTEM_EXTENSIONS
AC_PROG_CC
AC_PROG_CC_STDC

# Checks for programs.
AC_PROG_AWK
AC_PROG_MAKE_SET
AC_CHECK_PROGS(NPROC, [nproc gnproc])
LT_INIT

# Checks for typedefs, structures, and compiler characteristics.
AC_C_INLINE
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_TYPE_UINT16_T
AC_TYPE_INT32_T
AC_TYPE_UINT32_T
AC_TYPE_UINT64_T
AC_TYPE_UINT8_T

AX_C___ATTRIBUTE__
AS_IF([test "x$ax_cv___attribute__" = "xyes"],
	[:],
	[AC_MSG_ERROR([The compiler does not support __attribute__ extensions])])

AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
LIBS="$PTHREAD_LIBS $LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
CC="$PTHREAD_CC"

# Checks for library functions.
AC_FUNC_MALLOC
AC_FUNC_MMAP
AC_FUNC_FORK
AC_CHECK_FUNCS([ \
	atexit \
	getcpuid \
	gettid \
	gettimeofday \
	memeset \
	memset \
	munmap \
	sched_getcpu \
	strerror \
	strtoul \
	sysconf \
])

# Check for headers
AC_HEADER_STDBOOL
AC_CHECK_HEADERS([ \
	limits.h \
	stddef.h \
	sys/param.h \
	sys/time.h \
])

# Find arch type
AS_CASE([$host_cpu],
	[k1om], [ARCHTYPE="x86"],
	[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"],
	[powerpc64le], [ARCHTYPE="ppc"],
	[ppc], [ARCHTYPE="ppc"],
	[s390], [ARCHTYPE="s390"],
	[s390x], [ARCHTYPE="s390"],
	[sparc], [ARCHTYPE="sparc64"],
	[sparc64], [ARCHTYPE="sparc64"],
	[alpha*], [ARCHTYPE="alpha"],
	[ia64], [ARCHTYPE="ia64"],
	[arm*], [ARCHTYPE="arm"],
	[aarch64*], [ARCHTYPE="aarch64"],
	[mips*], [ARCHTYPE="mips"],
	[tile*], [ARCHTYPE="tile"],
	[hppa*], [ARCHTYPE="hppa"],
	[ARCHTYPE="unknown"]
)

AS_CASE([$host],[*-*-linux-androideabi],
	[AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
	[AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
)

AS_CASE([$host],[*-cygwin*],
	[AM_CONDITIONAL(USE_CYGWIN, true)],
	[AM_CONDITIONAL(USE_CYGWIN, false)]
)

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([[
				int main()
				{
					asm volatile("dmb":::"memory");
					return 0;
				}
		]])
	],[
		AC_MSG_RESULT([yes])
		AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
	],[
		AC_MSG_RESULT([no])
	])
])

# Tile-specific checks
AS_IF([echo "$host_cpu" | grep "^tile"],[
	AC_MSG_CHECKING([for Tile architecture type])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
				#ifndef __tilegx__
				#error
				#endif
		]])
	],[
		AC_MSG_RESULT([ok])
	],[
		AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
	])
])

# x86-specific checks
AS_IF([test "x$ARCHTYPE" = "xx86"],[
	AC_MSG_CHECKING([if architecture really supports the mfence instruction])
	#For now, using lock; addl compatibility mode even for i686, because the
	#Pentium III is seen as a i686, but lacks mfence instruction.
	#Only using fence for x86_64.
	#
	#k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
	#variant but lacks fence instructions.
	AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om" -a "x$host_cpu" != "xk1om"],[
		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
])

# Search for clock_gettime
AC_SEARCH_LIBS([clock_gettime], [rt], [],
	[AC_MSG_ERROR([Cannot find clock_gettime function.])]
)

# Check for pthread
AC_CHECK_LIB([pthread], [pthread_create],
	[AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
	[AC_CHECK_LIB([c], [pthread_create],
		[AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
		[AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
	)]
)

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

# 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"

AC_CHECK_TYPES([cpu_set_t],
	[have_cpu_set_t="yes"],
	[have_cpu_set_t="no"],
	[#include <sched.h>])

# 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>
		int main()
		{
			cpu_set_t foo; CPU_ZERO(&foo);
			return 0;
		}
	]])
],[
	AC_DEFINE(HAVE_CPU_ZERO, 1)
	AC_MSG_RESULT([yes])
],[
	AC_MSG_RESULT([no])
])

# Confirm that we have CPU_SET, and it actually works.
AC_MSG_CHECKING([whether CPU_SET works])
AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
		#define _GNU_SOURCE
		#include <sched.h>
		int main()
		{
			cpu_set_t foo, mask; CPU_SET(0, &foo);
			return 0;
		}
	]])
],[
	AC_DEFINE(HAVE_CPU_SET, 1)
	AC_MSG_RESULT([yes])
],[
	AC_MSG_RESULT([no])
])

# 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.

	AS_IF([test "x$have_cpu_set_t" = "xyes"], [
		# We do have it.
		# 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>
				int main()
				{
					cpu_set_t foo;
					sched_setaffinity(0, sizeof (foo), &foo);
					return 0;
				}
			]])
		],
		[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)
	])
])

CFLAGS=$saved_CFLAGS

AC_CONFIG_LINKS([
	urcu/arch.h:$ARCHSRC
	urcu/uatomic.h:$UATOMICSRC
])
AC_CONFIG_FILES([
	Makefile
	doc/Makefile
	doc/examples/Makefile
	tests/Makefile
	tests/common/Makefile
	tests/unit/Makefile
	tests/benchmark/Makefile
	tests/regression/Makefile
	tests/regression/regression_tests
	tests/utils/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.")
])

AS_IF([test "x$def_tls_detect" = "x"],[
	AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
],[
	AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
])
Commit	Line	Data
074c3a1b	1	AC_PREREQ(2.59)
5b78b214	2	AC_INIT([userspace-rcu],[0.9.2],[mathieu dot desnoyers at efficios dot com], [], [http://liburcu.org/])
98bc124a YB	3
	4	# Following the numbering scheme proposed by libtool for the library version
	5	# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
69c9a8c0	6	AC_SUBST([URCU_LIBRARY_VERSION], [4:0:0])
98bc124a	7
074c3a1b MJ	8	AC_CONFIG_SRCDIR([urcu.h])
074c3a1b MJ	9	AC_CONFIG_HEADERS([config.h urcu/config.h])
48d848c7	10	AC_CONFIG_AUX_DIR([config])
074c3a1b MJ	11	AC_CONFIG_MACRO_DIR([m4])
074c3a1b MJ	12
7d413817 MD	13	AC_CANONICAL_TARGET
7d413817 MD	14	AC_CANONICAL_HOST
074c3a1b	15
48d848c7	16	AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
35eb2d6c	17	AM_MAINTAINER_MODE([enable])
7d413817	18
074c3a1b MJ	19	# Enable silent rules if available (Introduced in AM 1.11)
074c3a1b MJ	20	m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
e72596d1	21
02be5561 MD	22	AH_TEMPLATE([CONFIG_RCU_SMP], [Enable SMP support. With SMP support enabled, uniprocessors are also supported. With SMP support disabled, UP systems work fine, but the behavior of SMP systems is undefined.])
	23	AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
	24	AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
a6412536 AM	25	AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
a6412536 AM	26	AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
a767fdc3 MD	27	AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
a767fdc3 MD	28
75478b32 MD	29	# Allow overriding storage used for TLS variables.
	30	AC_ARG_ENABLE([compiler-tls],
	31	AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
	32	[def_compiler_tls=$enableval],
	33	[def_compiler_tls="yes"])
	34
	35	# If not overridden, use ax_tls.m4 to check if TLS is available.
	36	AS_IF([test "x$def_compiler_tls" = "xyes"],
	37	[AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
	38	[:])
	39
	40	AS_IF([test "x$def_tls_detect" = "x"],
	41	[:],
	42	[AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
48d848c7	43
074c3a1b MJ	44	# Checks for C compiler
074c3a1b MJ	45	AC_USE_SYSTEM_EXTENSIONS
48d848c7	46	AC_PROG_CC
074c3a1b MJ	47	AC_PROG_CC_STDC
	48
	49	# Checks for programs.
27d5e306	50	AC_PROG_AWK
48d848c7	51	AC_PROG_MAKE_SET
074c3a1b	52	AC_CHECK_PROGS(NPROC, [nproc gnproc])
b14a378a	53	LT_INIT
48d848c7 PMF	54
	55	# Checks for typedefs, structures, and compiler characteristics.
	56	AC_C_INLINE
	57	AC_TYPE_PID_T
	58	AC_TYPE_SIZE_T
27d5e306 MJ	59	AC_TYPE_SSIZE_T
27d5e306 MJ	60	AC_TYPE_UINT16_T
991d28ca JR	61	AC_TYPE_INT32_T
	62	AC_TYPE_UINT32_T
	63	AC_TYPE_UINT64_T
	64	AC_TYPE_UINT8_T
48d848c7	65
074c3a1b MJ	66	AX_C___ATTRIBUTE__
	67	AS_IF([test "x$ax_cv___attribute__" = "xyes"],
	68	[:],
	69	[AC_MSG_ERROR([The compiler does not support __attribute__ extensions])])
	70
	71	AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
	72	LIBS="$PTHREAD_LIBS $LIBS"
	73	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
	74	CC="$PTHREAD_CC"
	75
48d848c7 PMF	76	# Checks for library functions.
	77	AC_FUNC_MALLOC
	78	AC_FUNC_MMAP
27d5e306 MJ	79	AC_FUNC_FORK
	80	AC_CHECK_FUNCS([ \
	81	atexit \
27d5e306 MJ	82	getcpuid \
	83	gettid \
	84	gettimeofday \
	85	memeset \
	86	memset \
	87	munmap \
	88	sched_getcpu \
	89	strerror \
	90	strtoul \
	91	sysconf \
	92	])
48d848c7	93
bb6afa9a	94	# Check for headers
7dea28e7	95	AC_HEADER_STDBOOL
27d5e306 MJ	96	AC_CHECK_HEADERS([ \
	97	limits.h \
	98	stddef.h \
	99	sys/param.h \
	100	sys/time.h \
	101	])
bb6afa9a	102
48d848c7	103	# Find arch type
58e9f838	104	AS_CASE([$host_cpu],
ab4523c0	105	[k1om], [ARCHTYPE="x86"],
a6412536 AM	106	[i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
	107	[i486], [ARCHTYPE="x86"],
	108	[i586], [ARCHTYPE="x86"],
	109	[i686], [ARCHTYPE="x86"],
	110	[amd64], [ARCHTYPE="x86"],
	111	[x86_64], [ARCHTYPE="x86"],
	112	[powerpc], [ARCHTYPE="ppc"],
	113	[ppc64], [ARCHTYPE="ppc"],
	114	[powerpc64], [ARCHTYPE="ppc"],
61126bd9	115	[powerpc64le], [ARCHTYPE="ppc"],
a6412536 AM	116	[ppc], [ARCHTYPE="ppc"],
	117	[s390], [ARCHTYPE="s390"],
	118	[s390x], [ARCHTYPE="s390"],
171ff3a3	119	[sparc], [ARCHTYPE="sparc64"],
a6412536 AM	120	[sparc64], [ARCHTYPE="sparc64"],
a6412536 AM	121	[alpha*], [ARCHTYPE="alpha"],
c21a8d01	122	[ia64], [ARCHTYPE="ia64"],
a6412536	123	[arm*], [ARCHTYPE="arm"],
f772add3	124	[aarch64*], [ARCHTYPE="aarch64"],
e1259cb1	125	[mips*], [ARCHTYPE="mips"],
c23069c6	126	[tile*], [ARCHTYPE="tile"],
13e0bc72	127	[hppa*], [ARCHTYPE="hppa"],
a6412536 AM	128	[ARCHTYPE="unknown"]
a6412536 AM	129	)
91b0650a	130
de41725c CB	131	AS_CASE([$host],[--linux-androideabi],
	132	[AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
	133	[AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
	134	)
	135
e14c9f0d SB	136	AS_CASE([$host],[-cygwin],
	137	[AM_CONDITIONAL(USE_CYGWIN, true)],
	138	[AM_CONDITIONAL(USE_CYGWIN, false)]
	139	)
	140
a6412536 AM	141	AC_SUBST(ARCHTYPE)
a6412536 AM	142	AC_SUBST(SUBARCHTYPE)
5e626e0e	143
a2e7bf9c	144	UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8	145	ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a	146
a6412536 AM	147	AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
	148	AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
	149	])
	150
58e9f838	151	AS_IF([test "$host_cpu" = "armv7l"],[
a6412536 AM	152	CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
a6412536 AM	153	])
48d848c7	154
a6412536 AM	155	# ARM-specific checks
	156	AS_IF([test "x$ARCHTYPE" = "xarm"],[
	157	AC_MSG_CHECKING([for dmb instruction])
fe0707ab MD	158	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	159	int main()
	160	{
	161	asm volatile("dmb":::"memory");
	162	return 0;
	163	}
	164	]])
	165	],[
a6412536 AM	166	AC_MSG_RESULT([yes])
	167	AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
	168	],[
	169	AC_MSG_RESULT([no])
	170	])
	171	])
	172
274773cf SM	173	# Tile-specific checks
	174	AS_IF([echo "$host_cpu" \| grep "^tile"],[
	175	AC_MSG_CHECKING([for Tile architecture type])
	176	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	177	#ifndef __tilegx__
	178	#error
	179	#endif
	180	]])
	181	],[
	182	AC_MSG_RESULT([ok])
	183	],[
	184	AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
	185	])
	186	])
	187
a6412536 AM	188	# x86-specific checks
	189	AS_IF([test "x$ARCHTYPE" = "xx86"],[
	190	AC_MSG_CHECKING([if architecture really supports the mfence instruction])
	191	#For now, using lock; addl compatibility mode even for i686, because the
	192	#Pentium III is seen as a i686, but lacks mfence instruction.
	193	#Only using fence for x86_64.
8496c886 SM	194	#
	195	#k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
	196	#variant but lacks fence instructions.
ab4523c0	197	AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om" -a "x$host_cpu" != "xk1om"],[
a6412536 AM	198	AC_MSG_RESULT([yes])
	199	AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
	200	],[
	201	AC_MSG_RESULT([no])
	202	])
	203	])
	204
	205	# Check if sys_futex() is available
	206	AC_MSG_CHECKING([for sys_futex()])
fe0707ab	207	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536	208	#include <sys/syscall.h>
a6412536 AM	209	#ifndef __NR_futex
	210	#error "futexes not available"
	211	#endif
fe0707ab	212	]])
a6412536	213	],[
0854ccff	214	AC_MSG_RESULT([yes])
02be5561	215	AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff	216	compat_futex_test=0
91b0650a	217	],[
0854ccff MD	218	AC_MSG_RESULT([no])
0854ccff MD	219	compat_futex_test=1
91b0650a	220	])
0854ccff	221
b4bdf51a OJ	222	# Search for clock_gettime
	223	AC_SEARCH_LIBS([clock_gettime], [rt], [],
	224	[AC_MSG_ERROR([Cannot find clock_gettime function.])]
	225	)
	226
0e1efa0e CB	227	# Check for pthread
	228	AC_CHECK_LIB([pthread], [pthread_create],
	229	[AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
	230	[AC_CHECK_LIB([c], [pthread_create],
	231	[AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
	232	[AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
	233	)]
	234	)
	235
a6412536 AM	236	AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
a6412536 AM	237	AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496	238	AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff	239
a6412536 AM	240	# smp-support configure option
	241	AC_ARG_ENABLE([smp-support],
	242	AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
	243	[def_smp_support=$enableval],
	244	[def_smp_support="yes"])
	245	AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817	246
48d848c7	247
d8540fc5 PA	248	# From the sched_setaffinity(2)'s man page:
	249	# ~~~~
	250	# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
	251	# The library interfaces were introduced in glibc 2.3. Initially, the
	252	# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
	253	# the cpuset size argument was removed, but this argument was
	254	# restored in glibc 2.3.4.
	255	# ~~~~
	256
	257	# In addition to that, some vendors ported the system call to 2.4
	258	# kernels.
	259
	260	# Furthermore, when the function first appeared, the MASK argument was
	261	# an unsigned long pointer, while later it was made into a cpu_set_t
	262	# pointer. Systems that have the cpu_set_t version also should have
	263	# the CPU_ZERO, CPU_SET, etc. macros.
	264
	265	# All this mess means we have to cater for at least 3 different
	266	# sched_setaffinity prototypes:
	267
	268	# ~~~~
	269	# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
	270	# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
	271	# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
	272	# ~~~~
	273
a6412536 AM	274	# Since we define _GNU_SOURCE in the sources, must do so too in the
	275	# autoconf tests, as defining _GNU_SOURCE or not exposes
	276	# sched_setaffinity bits differently.
d8540fc5 PA	277	saved_CFLAGS=$CFLAGS
	278	CFLAGS="$CFLAGS -D_GNU_SOURCE"
	279
b3231c17 MD	280	AC_CHECK_TYPES([cpu_set_t],
	281	[have_cpu_set_t="yes"],
	282	[have_cpu_set_t="no"],
	283	[#include <sched.h>])
	284
	285	# Confirm that we have CPU_ZERO, and it actually works.
	286	AC_MSG_CHECKING([whether CPU_ZERO works])
	287	AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
	288	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	289	#define _GNU_SOURCE
	290	#include <sched.h>
	291	int main()
	292	{
	293	cpu_set_t foo; CPU_ZERO(&foo);
	294	return 0;
	295	}
	296	]])
	297	],[
	298	AC_DEFINE(HAVE_CPU_ZERO, 1)
	299	AC_MSG_RESULT([yes])
	300	],[
	301	AC_MSG_RESULT([no])
	302	])
	303
	304	# Confirm that we have CPU_SET, and it actually works.
	305	AC_MSG_CHECKING([whether CPU_SET works])
	306	AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
	307	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	308	#define _GNU_SOURCE
	309	#include <sched.h>
	310	int main()
	311	{
	312	cpu_set_t foo, mask; CPU_SET(0, &foo);
	313	return 0;
	314	}
	315	]])
	316	],[
	317	AC_DEFINE(HAVE_CPU_SET, 1)
	318	AC_MSG_RESULT([yes])
	319	],[
	320	AC_MSG_RESULT([no])
	321	])
	322
d8540fc5	323	# First check if the function is available at all.
a6412536 AM	324	AC_CHECK_FUNCS([sched_setaffinity],[
	325	# Okay, we have it. Check if also have cpu_set_t. If we don't,
	326	# then we have the first version using unsigned long, and no
	327	# CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
	328	# version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
	329	# should also be present, but we confirm nonetheless.
	330
b3231c17 MD	331	AS_IF([test "x$have_cpu_set_t" = "xyes"], [
b3231c17 MD	332	# We do have it.
a6412536 AM	333	# Check how many arguments does sched_setaffinity take.
	334	# Should be 3 or 2.
	335	AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14	336	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536	337	#include <sched.h>
fe0707ab MD	338	int main()
	339	{
	340	cpu_set_t foo;
b3231c17	341	sched_setaffinity(0, sizeof (foo), &foo);
fe0707ab MD	342	return 0;
fe0707ab MD	343	}
a6412536 AM	344	]])
	345	],
	346	[sched_set_affinity_args=3],
	347	[sched_set_affinity_args=2])
b3231c17 MD	348	AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
b3231c17 MD	349	$sched_set_affinity_args,
a6412536 AM	350	[Defined to sched_setaffinity's number of arguments.])
	351	AC_MSG_RESULT([$sched_set_affinity_args])
	352	],[
	353	# No cpu_set_t, always 3 args.
	354	AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17	355	])
a6412536	356	])
d8540fc5 PA	357
	358	CFLAGS=$saved_CFLAGS
	359
455b809a PB	360	AC_CONFIG_LINKS([
455b809a PB	361	urcu/arch.h:$ARCHSRC
a2e7bf9c	362	urcu/uatomic.h:$UATOMICSRC
455b809a	363	])
48d848c7 PMF	364	AC_CONFIG_FILES([
48d848c7 PMF	365	Makefile
fe999c05	366	doc/Makefile
8bad63a0	367	doc/examples/Makefile
48d848c7	368	tests/Makefile
f5ab766e MD	369	tests/common/Makefile
	370	tests/unit/Makefile
	371	tests/benchmark/Makefile
	372	tests/regression/Makefile
074c3a1b	373	tests/regression/regression_tests
1b387491	374	tests/utils/Makefile
2260a36c YB	375	liburcu.pc
2260a36c YB	376	liburcu-bp.pc
a6412536	377	liburcu-cds.pc
2260a36c YB	378	liburcu-qsbr.pc
	379	liburcu-mb.pc
	380	liburcu-signal.pc
48d848c7 PMF	381	])
48d848c7 PMF	382	AC_OUTPUT
a6412536 AM	383
	384	# Report on selected configure options
	385	AS_IF([test "x$def_smp_support" = "xyes"],[
	386	AS_ECHO("SMP support enabled.")
	387	],[
	388	AS_ECHO("SMP support disabled.")
	389	])
75478b32 MD	390
	391	AS_IF([test "x$def_tls_detect" = "x"],[
	392	AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
	393	],[
	394	AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
	395	])