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configure.ac
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# -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_INIT([userspace-rcu], [0.6.4], [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_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])
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.])
AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
# 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 sched_getcpu strtoul sysconf])
# Find arch type
case $host_cpu in
i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
i486) ARCHTYPE="x86";;
i586) ARCHTYPE="x86";;
i686) ARCHTYPE="x86";;
x86_64) ARCHTYPE="x86";;
powerpc) ARCHTYPE="ppc" ;;
ppc64) ARCHTYPE="ppc" ;;
powerpc64) ARCHTYPE="ppc" ;;
ppc) ARCHTYPE="ppc" ;;
s390) ARCHTYPE="s390" ;;
s390x) ARCHTYPE="s390" ;;
sparc64) ARCHTYPE="sparc64" ;;
alpha*) ARCHTYPE="alpha" ;;
ia64) ARCHTYPE="gcc" ;;
arm*) ARCHTYPE="arm" ;;
*) ARCHTYPE="unknown";;
esac
if test "x$ARCHTYPE" = "xarm" ; then
AC_MSG_CHECKING([checking for dmb instruction])
AC_TRY_COMPILE(
[
],
[
asm volatile("dmb":::"memory");
],
[
AC_MSG_RESULT([yes])
AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
]
,
[
AC_MSG_RESULT([no])
]
)
fi
UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
ARCHSRC=urcu/arch/$ARCHTYPE.h
if test "$ARCHTYPE" == "armv7l"; then
CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
fi
AC_SUBST(ARCHTYPE)
AC_SUBST(SUBARCHTYPE)
[
#if test "x$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$compat_futex_test" = "x1" ])
AM_CONDITIONAL([COMPAT_ARCH], [test "x$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=$saved_CFLAGS
AC_CONFIG_LINKS([
urcu/arch.h:$ARCHSRC
urcu/uatomic.h:$UATOMICSRC
])
AC_CONFIG_FILES([
Makefile
tests/Makefile
liburcu-cds.pc
liburcu.pc
liburcu-bp.pc
liburcu-qsbr.pc
liburcu-mb.pc
liburcu-signal.pc
])
AC_OUTPUT