configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu],[0.6.6],[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_CANONICAL_TARGET
  13 AC_CANONICAL_HOST
  14 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
  15 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  16
  17 AC_CONFIG_SRCDIR([urcu.h])
  18 AM_PROG_MKDIR_P
  19
  20 AC_CONFIG_HEADERS([config.h urcu/config.h])
  21
  22 # Keep at the end to do not pollute installed header.
  23 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.])
  24 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  25 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  26 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
  27 cmpxchg instruction.])
  28 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
  29
  30 # Checks for programs.
  31 AC_PROG_CC
  32 AC_PROG_MAKE_SET
  33 LT_INIT
  34
  35 # Checks for typedefs, structures, and compiler characteristics.
  36 AC_C_INLINE
  37 AC_TYPE_PID_T
  38 AC_TYPE_SIZE_T
  39
  40 # Checks for library functions.
  41 AC_FUNC_MALLOC
  42 AC_FUNC_MMAP
  43 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
  44
  45 # Find arch type
  46 case $host_cpu in
  47         i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
  48         i486) ARCHTYPE="x86";;
  49         i586) ARCHTYPE="x86";;
  50         i686) ARCHTYPE="x86";;
  51         amd64) ARCHTYPE="x86";;
  52         x86_64) ARCHTYPE="x86";;
  53         powerpc) ARCHTYPE="ppc" ;;
  54         ppc64) ARCHTYPE="ppc" ;;
  55         powerpc64) ARCHTYPE="ppc" ;;
  56         ppc) ARCHTYPE="ppc" ;;
  57         s390) ARCHTYPE="s390" ;;
  58         s390x) ARCHTYPE="s390" ;;
  59         sparc64) ARCHTYPE="sparc64" ;;
  60         alpha*) ARCHTYPE="alpha" ;;
  61         ia64) ARCHTYPE="gcc" ;;
  62         arm*) ARCHTYPE="arm" ;;
  63         *) ARCHTYPE="unknown";;
  64 esac
  65
  66 if test "x$ARCHTYPE" = "xarm" ; then
  67 AC_MSG_CHECKING([checking for dmb instruction])
  68 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
  69 ]], [[
  70 asm volatile("dmb":::"memory");
  71 ]])],[
  72         AC_MSG_RESULT([yes])
  73         AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
  74
  75 ],[
  76         AC_MSG_RESULT([no])
  77
  78 ])
  79 fi
  80
  81 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  82 ARCHSRC=urcu/arch/$ARCHTYPE.h
  83 if test "$ARCHTYPE" == "armv7l"; then
  84         CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
  85 fi
  86
  87 AC_SUBST(ARCHTYPE)
  88 AC_SUBST(SUBARCHTYPE)
  89
  90 [
  91 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
  92 #For now, using lock; addl compatibility mode even for i686, because the
  93 #Pentium III is seen as a i686, but lacks mfence instruction.
  94 #Only using fence for x86_64.
  95 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
  96 ]
  97         AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
  98 [
  99 fi
 100 ]
 101
 102 AC_MSG_CHECKING([sys_futex()])
 103 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 104 #include <sys/syscall.h>
 105 ]], [[
 106 #ifndef __NR_futex
 107 #error "futexes not available"
 108 #endif
 109 ]])],[
 110         AC_MSG_RESULT([yes])
 111         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 112         compat_futex_test=0
 113
 114 ],[
 115         AC_MSG_RESULT([no])
 116         compat_futex_test=1
 117
 118 ])
 119
 120 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
 121
 122 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 123
 124 [
 125 if test "x$SUBARCHTYPE" = xx86compat; then
 126 ]
 127         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 128 [
 129 fi
 130 ]
 131
 132 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
 133                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
 134
 135 [
 136 if test "$def_smp_support" = "no"; then
 137         echo "SMP support disabled."
 138 else
 139 ]
 140         AC_DEFINE([CONFIG_RCU_SMP], [1])
 141 [
 142         echo "SMP support enabled."
 143 fi
 144 ]
 145
 146 # From the sched_setaffinity(2)'s man page:
 147 # ~~~~
 148 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 149 # The library interfaces were introduced in glibc 2.3.  Initially, the
 150 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 151 # the cpuset size argument was removed, but this argument was
 152 # restored in glibc 2.3.4.
 153 # ~~~~
 154
 155 # In addition to that, some vendors ported the system call to 2.4
 156 # kernels.
 157
 158 # Furthermore, when the function first appeared, the MASK argument was
 159 # an unsigned long pointer, while later it was made into a cpu_set_t
 160 # pointer.  Systems that have the cpu_set_t version also should have
 161 # the CPU_ZERO, CPU_SET, etc. macros.
 162
 163 # All this mess means we have to cater for at least 3 different
 164 # sched_setaffinity prototypes:
 165
 166 # ~~~~
 167 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 168 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 169 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 170 # ~~~~
 171
 172 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
 173 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
 174 dnl sched_setaffinity bits differently.
 175 saved_CFLAGS=$CFLAGS
 176 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 177
 178 # First check if the function is available at all.
 179 AC_CHECK_FUNCS(
 180   [sched_setaffinity],
 181   [ # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 182     # then we have the first version using unsigned long, and no
 183     # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 184     # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 185     # should also be present, but we confirm nonetheless.
 186
 187     AC_CHECK_TYPES(
 188       [cpu_set_t],
 189       [ # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 190         AC_MSG_CHECKING([whether CPU_ZERO works])
 191         AH_TEMPLATE([HAVE_CPU_ZERO],
 192                     [Define to 1 if we have CPU_ZERO and if it works])
 193         AC_COMPILE_IFELSE(
 194           [AC_LANG_PROGRAM(
 195             [#define _GNU_SOURCE
 196             #include <sched.h>],
 197             [cpu_set_t foo; CPU_ZERO (&foo);])
 198           ],
 199           [ # Works!
 200             AC_DEFINE(HAVE_CPU_ZERO, 1)
 201             AC_MSG_RESULT([yes])
 202           ],
 203           [AC_MSG_RESULT([no])]
 204         )
 205
 206         # Check how many arguments does sched_setaffinity take.
 207         # Should be 3 or 2.
 208         AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 209         AC_COMPILE_IFELSE(
 210           [AC_LANG_PROGRAM(
 211             [#include <sched.h>],
 212             [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
 213           ],
 214           [sched_set_affinity_args=3],
 215           [sched_set_affinity_args=2])
 216         AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 217          [Define to sched_setaffinity's number of arguments.])
 218         AC_MSG_RESULT([$sched_set_affinity_args])
 219       ],
 220       [ # No cpu_set_t, always 3 args.
 221         AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
 222       [#include <sched.h>]
 223     )
 224   ]
 225 )
 226
 227 CFLAGS=$saved_CFLAGS
 228
 229 AC_CONFIG_LINKS([
 230         urcu/arch.h:$ARCHSRC
 231         urcu/uatomic.h:$UATOMICSRC
 232 ])
 233 AC_CONFIG_FILES([
 234         Makefile
 235         tests/Makefile
 236         liburcu-cds.pc
 237         liburcu.pc
 238         liburcu-bp.pc
 239         liburcu-qsbr.pc
 240         liburcu-mb.pc
 241         liburcu-signal.pc
 242 ])
 243 AC_OUTPUT