[urcu.git] / configure.ac

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


AC_INIT([userspace-rcu], [0.4.1], [mathieu dot desnoyers at efficios dot com])
AC_CONFIG_AUX_DIR([config])
AC_CANONICAL_TARGET
AC_CANONICAL_HOST
AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
AC_CONFIG_SRCDIR([urcu.h])
AM_PROG_MKDIR_P

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

# Keep at the end to do not pollute installed header.
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.])

# Checks for programs.
AC_PROG_CC
AC_PROG_MAKE_SET
AC_PROG_LIBTOOL

# 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 strtoul])

# Find arch type
case $host_cpu in
	i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
	i486) ARCHTYPE="x86";;
	i586) ARCHTYPE="x86";;
	i686) 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" ;;
	*) ARCHTYPE="unknown";;
esac

if test "$ARCHTYPE" = "unknown"; then
	AC_MSG_ERROR([Unable to detect the architecture.])
fi
AC_SUBST(ARCHTYPE)
AC_SUBST(SUBARCHTYPE)

[
#if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
#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.
if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
]
	AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
[
fi
]

AC_MSG_CHECKING([sys_futex()])
AC_TRY_COMPILE(
[
#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([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])

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

[
if test "x$SUBARCHTYPE" = xx86compat; then
]
	AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
[
fi
]

AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
                          on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])

[
if test "$def_smp_support" = "no"; then
	echo "SMP support disabled."
else
]
	AC_DEFINE([CONFIG_RCU_SMP], [1])
[
	echo "SMP support enabled."
fi
]

# 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);
# ~~~~

dnl Since we define _GNU_SOURCE in the sources, must do so too in the
dnl autoconf tests, as defining _GNU_SOURCE or not exposes
dnl 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],
		    [Define to 1 if we have CPU_ZERO and if it works])
	AC_COMPILE_IFELSE(
	  [AC_LANG_PROGRAM(
	    [#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_PROGRAM(
	    [#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, $sched_set_affinity_args,
	 [Define to sched_setaffinity's number of arguments.])
	AC_MSG_RESULT([$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_FILES([
	Makefile
	tests/Makefile
])
AC_OUTPUT
Commit	Line	Data
	1	# -- Autoconf --
	2	# Process this file with autoconf to produce a configure script.
	3
	4
	5	AC_INIT([userspace-rcu], [0.4.1], [mathieu dot desnoyers at efficios dot com])
	6	AC_CONFIG_AUX_DIR([config])
	7	AC_CANONICAL_TARGET
	8	AC_CANONICAL_HOST
	9	AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
	10	AC_CONFIG_SRCDIR([urcu.h])
	11	AM_PROG_MKDIR_P
	12
	13	AC_CONFIG_HEADERS([config.h urcu/config.h])
	14
	15	# Keep at the end to do not pollute installed header.
	16	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.])
	17	AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
	18	AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
	19	AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
	20	cmpxchg instruction.])
	21
	22	# Checks for programs.
	23	AC_PROG_CC
	24	AC_PROG_MAKE_SET
	25	AC_PROG_LIBTOOL
	26
	27	# Checks for typedefs, structures, and compiler characteristics.
	28	AC_C_INLINE
	29	AC_TYPE_PID_T
	30	AC_TYPE_SIZE_T
	31
	32	# Checks for library functions.
	33	AC_FUNC_MALLOC
	34	AC_FUNC_MMAP
	35	AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
	36
	37	# Find arch type
	38	case $host_cpu in
	39	i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
	40	i486) ARCHTYPE="x86";;
	41	i586) ARCHTYPE="x86";;
	42	i686) ARCHTYPE="x86";;
	43	x86_64) ARCHTYPE="x86";;
	44	powerpc) ARCHTYPE="ppc" ;;
	45	ppc64) ARCHTYPE="ppc" ;;
	46	powerpc64) ARCHTYPE="ppc" ;;
	47	ppc) ARCHTYPE="ppc" ;;
	48	s390) ARCHTYPE="s390" ;;
	49	s390x) ARCHTYPE="s390" ;;
	50	sparc64) ARCHTYPE="sparc64" ;;
	51	*) ARCHTYPE="unknown";;
	52	esac
	53
	54	if test "$ARCHTYPE" = "unknown"; then
	55	AC_MSG_ERROR([Unable to detect the architecture.])
	56	fi
	57	AC_SUBST(ARCHTYPE)
	58	AC_SUBST(SUBARCHTYPE)
	59
	60	[
	61	#if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
	62	#For now, using lock; addl compatibility mode even for i686, because the
	63	#Pentium III is seen as a i686, but lacks mfence instruction.
	64	#Only using fence for x86_64.
	65	if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
	66	]
	67	AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
	68	[
	69	fi
	70	]
	71
	72	AC_MSG_CHECKING([sys_futex()])
	73	AC_TRY_COMPILE(
	74	[
	75	#include <sys/syscall.h>
	76	],
	77	[
	78	#ifndef __NR_futex
	79	#error "futexes not available"
	80	#endif
	81	],
	82	[
	83	AC_MSG_RESULT([yes])
	84	AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
	85	compat_futex_test=0
	86	]
	87	,
	88	[
	89	AC_MSG_RESULT([no])
	90	compat_futex_test=1
	91	]
	92	)
	93
	94	AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
	95
	96	AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
	97
	98	AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
	99
	100	[
	101	if test "x$SUBARCHTYPE" = xx86compat; then
	102	]
	103	AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
	104	[
	105	fi
	106	]
	107
	108	AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
	109	on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
	110
	111	[
	112	if test "$def_smp_support" = "no"; then
	113	echo "SMP support disabled."
	114	else
	115	]
	116	AC_DEFINE([CONFIG_RCU_SMP], [1])
	117	[
	118	echo "SMP support enabled."
	119	fi
	120	]
	121
	122	# From the sched_setaffinity(2)'s man page:
	123	# ~~~~
	124	# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
	125	# The library interfaces were introduced in glibc 2.3. Initially, the
	126	# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
	127	# the cpuset size argument was removed, but this argument was
	128	# restored in glibc 2.3.4.
	129	# ~~~~
	130
	131	# In addition to that, some vendors ported the system call to 2.4
	132	# kernels.
	133
	134	# Furthermore, when the function first appeared, the MASK argument was
	135	# an unsigned long pointer, while later it was made into a cpu_set_t
	136	# pointer. Systems that have the cpu_set_t version also should have
	137	# the CPU_ZERO, CPU_SET, etc. macros.
	138
	139	# All this mess means we have to cater for at least 3 different
	140	# sched_setaffinity prototypes:
	141
	142	# ~~~~
	143	# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
	144	# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
	145	# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
	146	# ~~~~
	147
	148	dnl Since we define _GNU_SOURCE in the sources, must do so too in the
	149	dnl autoconf tests, as defining _GNU_SOURCE or not exposes
	150	dnl sched_setaffinity bits differently.
	151	saved_CFLAGS=$CFLAGS
	152	CFLAGS="$CFLAGS -D_GNU_SOURCE"
	153
	154	# First check if the function is available at all.
	155	AC_CHECK_FUNCS(
	156	[sched_setaffinity],
	157	[ # Okay, we have it. Check if also have cpu_set_t. If we don't,
	158	# then we have the first version using unsigned long, and no
	159	# CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
	160	# version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
	161	# should also be present, but we confirm nonetheless.
	162
	163	AC_CHECK_TYPES(
	164	[cpu_set_t],
	165	[ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
	166	AC_MSG_CHECKING([whether CPU_ZERO works])
	167	AH_TEMPLATE([HAVE_CPU_ZERO],
	168	[Define to 1 if we have CPU_ZERO and if it works])
	169	AC_COMPILE_IFELSE(
	170	[AC_LANG_PROGRAM(
	171	[#define _GNU_SOURCE
	172	#include <sched.h>],
	173	[cpu_set_t foo; CPU_ZERO (&foo);])
	174	],
	175	[ # Works!
	176	AC_DEFINE(HAVE_CPU_ZERO, 1)
	177	AC_MSG_RESULT([yes])
	178	],
	179	[AC_MSG_RESULT([no])]
	180	)
	181
	182	# Check how many arguments does sched_setaffinity take.
	183	# Should be 3 or 2.
	184	AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
	185	AC_COMPILE_IFELSE(
	186	[AC_LANG_PROGRAM(
	187	[#include <sched.h>],
	188	[cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
	189	],
	190	[sched_set_affinity_args=3],
	191	[sched_set_affinity_args=2])
	192	AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
	193	[Define to sched_setaffinity's number of arguments.])
	194	AC_MSG_RESULT([$sched_set_affinity_args])
	195	],
	196	[ # No cpu_set_t, always 3 args.
	197	AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
	198	[#include <sched.h>]
	199	)
	200	]
	201	)
	202
	203	CFLAGS=$saved_CFLAGS
	204
	205	AC_CONFIG_FILES([
	206	Makefile
	207	tests/Makefile
	208	])
	209	AC_OUTPUT