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 AC_PROG_LIBTOOL
  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_TRY_COMPILE(
  69 [
  70 ],
  71 [
  72 asm volatile("dmb":::"memory");
  73 ],
  74 [
  75         AC_MSG_RESULT([yes])
  76         AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
  77 ]
  78 ,
  79 [
  80         AC_MSG_RESULT([no])
  81 ]
  82 )
  83 fi
  84
  85 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  86 ARCHSRC=urcu/arch/$ARCHTYPE.h
  87 if test "$ARCHTYPE" == "armv7l"; then
  88         CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
  89 fi
  90
  91 AC_SUBST(ARCHTYPE)
  92 AC_SUBST(SUBARCHTYPE)
  93
  94 [
  95 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
  96 #For now, using lock; addl compatibility mode even for i686, because the
  97 #Pentium III is seen as a i686, but lacks mfence instruction.
  98 #Only using fence for x86_64.
  99 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
 100 ]
 101         AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 102 [
 103 fi
 104 ]
 105
 106 AC_MSG_CHECKING([sys_futex()])
 107 AC_TRY_COMPILE(
 108 [
 109 #include <sys/syscall.h>
 110 ],
 111 [
 112 #ifndef __NR_futex
 113 #error "futexes not available"
 114 #endif
 115 ],
 116 [
 117         AC_MSG_RESULT([yes])
 118         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 119         compat_futex_test=0
 120 ]
 121 ,
 122 [
 123         AC_MSG_RESULT([no])
 124         compat_futex_test=1
 125 ]
 126 )
 127
 128 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
 129
 130 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 131
 132 [
 133 if test "x$SUBARCHTYPE" = xx86compat; then
 134 ]
 135         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 136 [
 137 fi
 138 ]
 139
 140 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
 141                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
 142
 143 [
 144 if test "$def_smp_support" = "no"; then
 145         echo "SMP support disabled."
 146 else
 147 ]
 148         AC_DEFINE([CONFIG_RCU_SMP], [1])
 149 [
 150         echo "SMP support enabled."
 151 fi
 152 ]
 153
 154 # From the sched_setaffinity(2)'s man page:
 155 # ~~~~
 156 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 157 # The library interfaces were introduced in glibc 2.3.  Initially, the
 158 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 159 # the cpuset size argument was removed, but this argument was
 160 # restored in glibc 2.3.4.
 161 # ~~~~
 162
 163 # In addition to that, some vendors ported the system call to 2.4
 164 # kernels.
 165
 166 # Furthermore, when the function first appeared, the MASK argument was
 167 # an unsigned long pointer, while later it was made into a cpu_set_t
 168 # pointer.  Systems that have the cpu_set_t version also should have
 169 # the CPU_ZERO, CPU_SET, etc. macros.
 170
 171 # All this mess means we have to cater for at least 3 different
 172 # sched_setaffinity prototypes:
 173
 174 # ~~~~
 175 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 176 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 177 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 178 # ~~~~
 179
 180 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
 181 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
 182 dnl sched_setaffinity bits differently.
 183 saved_CFLAGS=$CFLAGS
 184 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 185
 186 # First check if the function is available at all.
 187 AC_CHECK_FUNCS(
 188   [sched_setaffinity],
 189   [ # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 190     # then we have the first version using unsigned long, and no
 191     # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 192     # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 193     # should also be present, but we confirm nonetheless.
 194
 195     AC_CHECK_TYPES(
 196       [cpu_set_t],
 197       [ # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 198         AC_MSG_CHECKING([whether CPU_ZERO works])
 199         AH_TEMPLATE([HAVE_CPU_ZERO],
 200                     [Define to 1 if we have CPU_ZERO and if it works])
 201         AC_COMPILE_IFELSE(
 202           [AC_LANG_PROGRAM(
 203             [#define _GNU_SOURCE
 204             #include <sched.h>],
 205             [cpu_set_t foo; CPU_ZERO (&foo);])
 206           ],
 207           [ # Works!
 208             AC_DEFINE(HAVE_CPU_ZERO, 1)
 209             AC_MSG_RESULT([yes])
 210           ],
 211           [AC_MSG_RESULT([no])]
 212         )
 213
 214         # Check how many arguments does sched_setaffinity take.
 215         # Should be 3 or 2.
 216         AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 217         AC_COMPILE_IFELSE(
 218           [AC_LANG_PROGRAM(
 219             [#include <sched.h>],
 220             [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
 221           ],
 222           [sched_set_affinity_args=3],
 223           [sched_set_affinity_args=2])
 224         AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 225          [Define to sched_setaffinity's number of arguments.])
 226         AC_MSG_RESULT([$sched_set_affinity_args])
 227       ],
 228       [ # No cpu_set_t, always 3 args.
 229         AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
 230       [#include <sched.h>]
 231     )
 232   ]
 233 )
 234
 235 CFLAGS=$saved_CFLAGS
 236
 237 AC_CONFIG_LINKS([
 238         urcu/arch.h:$ARCHSRC
 239         urcu/uatomic.h:$UATOMICSRC
 240 ])
 241 AC_CONFIG_FILES([
 242         Makefile
 243         tests/Makefile
 244         liburcu-cds.pc
 245         liburcu.pc
 246         liburcu-bp.pc
 247         liburcu-qsbr.pc
 248         liburcu-mb.pc
 249         liburcu-signal.pc
 250 ])
 251 AC_OUTPUT