configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu], [0.6.4], [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 #for tests
  23 AM_PATH_GLIB_2_0(2.22.0, ,AC_MSG_ERROR([glib is required in order to compile BabelTrace - download it from ftp://ftp.gtk.org/pub/gtk]) , gmodule)
  24
  25 # Keep at the end to do not pollute installed header.
  26 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.])
  27 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  28 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  29 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
  30 cmpxchg instruction.])
  31 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
  32
  33 # Checks for programs.
  34 AC_PROG_CC
  35 AC_PROG_MAKE_SET
  36 AC_PROG_LIBTOOL
  37
  38 # Checks for typedefs, structures, and compiler characteristics.
  39 AC_C_INLINE
  40 AC_TYPE_PID_T
  41 AC_TYPE_SIZE_T
  42
  43 # Checks for library functions.
  44 AC_FUNC_MALLOC
  45 AC_FUNC_MMAP
  46 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
  47
  48 # Find arch type
  49 case $host_cpu in
  50         i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
  51         i486) ARCHTYPE="x86";;
  52         i586) ARCHTYPE="x86";;
  53         i686) ARCHTYPE="x86";;
  54         x86_64) ARCHTYPE="x86";;
  55         powerpc) ARCHTYPE="ppc" ;;
  56         ppc64) ARCHTYPE="ppc" ;;
  57         powerpc64) ARCHTYPE="ppc" ;;
  58         ppc) ARCHTYPE="ppc" ;;
  59         s390) ARCHTYPE="s390" ;;
  60         s390x) ARCHTYPE="s390" ;;
  61         sparc64) ARCHTYPE="sparc64" ;;
  62         alpha*) ARCHTYPE="alpha" ;;
  63         ia64) ARCHTYPE="gcc" ;;
  64         arm*) ARCHTYPE="arm" ;;
  65         *) ARCHTYPE="unknown";;
  66 esac
  67
  68 if test "x$ARCHTYPE" = "xarm" ; then
  69 AC_MSG_CHECKING([checking for dmb instruction])
  70 AC_TRY_COMPILE(
  71 [
  72 ],
  73 [
  74 asm volatile("dmb":::"memory");
  75 ],
  76 [
  77         AC_MSG_RESULT([yes])
  78         AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
  79 ]
  80 ,
  81 [
  82         AC_MSG_RESULT([no])
  83 ]
  84 )
  85 fi
  86
  87 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  88 ARCHSRC=urcu/arch/$ARCHTYPE.h
  89 if test "$ARCHTYPE" == "armv7l"; then
  90         CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
  91 fi
  92
  93 AC_SUBST(ARCHTYPE)
  94 AC_SUBST(SUBARCHTYPE)
  95
  96 [
  97 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
  98 #For now, using lock; addl compatibility mode even for i686, because the
  99 #Pentium III is seen as a i686, but lacks mfence instruction.
 100 #Only using fence for x86_64.
 101 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
 102 ]
 103         AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 104 [
 105 fi
 106 ]
 107
 108 AC_MSG_CHECKING([sys_futex()])
 109 AC_TRY_COMPILE(
 110 [
 111 #include <sys/syscall.h>
 112 ],
 113 [
 114 #ifndef __NR_futex
 115 #error "futexes not available"
 116 #endif
 117 ],
 118 [
 119         AC_MSG_RESULT([yes])
 120         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 121         compat_futex_test=0
 122 ]
 123 ,
 124 [
 125         AC_MSG_RESULT([no])
 126         compat_futex_test=1
 127 ]
 128 )
 129
 130 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
 131
 132 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 133
 134 [
 135 if test "x$SUBARCHTYPE" = xx86compat; then
 136 ]
 137         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 138 [
 139 fi
 140 ]
 141
 142 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
 143                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
 144
 145 [
 146 if test "$def_smp_support" = "no"; then
 147         echo "SMP support disabled."
 148 else
 149 ]
 150         AC_DEFINE([CONFIG_RCU_SMP], [1])
 151 [
 152         echo "SMP support enabled."
 153 fi
 154 ]
 155
 156 # From the sched_setaffinity(2)'s man page:
 157 # ~~~~
 158 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 159 # The library interfaces were introduced in glibc 2.3.  Initially, the
 160 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 161 # the cpuset size argument was removed, but this argument was
 162 # restored in glibc 2.3.4.
 163 # ~~~~
 164
 165 # In addition to that, some vendors ported the system call to 2.4
 166 # kernels.
 167
 168 # Furthermore, when the function first appeared, the MASK argument was
 169 # an unsigned long pointer, while later it was made into a cpu_set_t
 170 # pointer.  Systems that have the cpu_set_t version also should have
 171 # the CPU_ZERO, CPU_SET, etc. macros.
 172
 173 # All this mess means we have to cater for at least 3 different
 174 # sched_setaffinity prototypes:
 175
 176 # ~~~~
 177 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 178 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 179 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 180 # ~~~~
 181
 182 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
 183 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
 184 dnl sched_setaffinity bits differently.
 185 saved_CFLAGS=$CFLAGS
 186 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 187
 188 # First check if the function is available at all.
 189 AC_CHECK_FUNCS(
 190   [sched_setaffinity],
 191   [ # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 192     # then we have the first version using unsigned long, and no
 193     # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 194     # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 195     # should also be present, but we confirm nonetheless.
 196
 197     AC_CHECK_TYPES(
 198       [cpu_set_t],
 199       [ # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 200         AC_MSG_CHECKING([whether CPU_ZERO works])
 201         AH_TEMPLATE([HAVE_CPU_ZERO],
 202                     [Define to 1 if we have CPU_ZERO and if it works])
 203         AC_COMPILE_IFELSE(
 204           [AC_LANG_PROGRAM(
 205             [#define _GNU_SOURCE
 206             #include <sched.h>],
 207             [cpu_set_t foo; CPU_ZERO (&foo);])
 208           ],
 209           [ # Works!
 210             AC_DEFINE(HAVE_CPU_ZERO, 1)
 211             AC_MSG_RESULT([yes])
 212           ],
 213           [AC_MSG_RESULT([no])]
 214         )
 215
 216         # Check how many arguments does sched_setaffinity take.
 217         # Should be 3 or 2.
 218         AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 219         AC_COMPILE_IFELSE(
 220           [AC_LANG_PROGRAM(
 221             [#include <sched.h>],
 222             [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
 223           ],
 224           [sched_set_affinity_args=3],
 225           [sched_set_affinity_args=2])
 226         AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 227          [Define to sched_setaffinity's number of arguments.])
 228         AC_MSG_RESULT([$sched_set_affinity_args])
 229       ],
 230       [ # No cpu_set_t, always 3 args.
 231         AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
 232       [#include <sched.h>]
 233     )
 234   ]
 235 )
 236
 237 CFLAGS=$saved_CFLAGS
 238
 239 AC_CONFIG_LINKS([
 240         urcu/arch.h:$ARCHSRC
 241         urcu/uatomic.h:$UATOMICSRC
 242 ])
 243 AC_CONFIG_FILES([
 244         Makefile
 245         tests/Makefile
 246         liburcu-cds.pc
 247         liburcu.pc
 248         liburcu-bp.pc
 249         liburcu-qsbr.pc
 250         liburcu-mb.pc
 251         liburcu-signal.pc
 252 ])
 253 AC_OUTPUT