configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu], [0.5.2], [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 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  11
  12 AC_CONFIG_SRCDIR([urcu.h])
  13 AM_PROG_MKDIR_P
  14
  15 AC_CONFIG_HEADERS([config.h urcu/config.h])
  16
  17 # Keep at the end to do not pollute installed header.
  18 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.])
  19 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  20 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  21 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
  22 cmpxchg instruction.])
  23
  24 # Checks for programs.
  25 AC_PROG_CC
  26 AC_PROG_MAKE_SET
  27 AC_PROG_LIBTOOL
  28
  29 # Checks for typedefs, structures, and compiler characteristics.
  30 AC_C_INLINE
  31 AC_TYPE_PID_T
  32 AC_TYPE_SIZE_T
  33
  34 # Checks for library functions.
  35 AC_FUNC_MALLOC
  36 AC_FUNC_MMAP
  37 AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
  38
  39 # Find arch type
  40 case $host_cpu in
  41         i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
  42         i486) ARCHTYPE="x86";;
  43         i586) ARCHTYPE="x86";;
  44         i686) ARCHTYPE="x86";;
  45         x86_64) ARCHTYPE="x86";;
  46         powerpc) ARCHTYPE="ppc" ;;
  47         ppc64) ARCHTYPE="ppc" ;;
  48         powerpc64) ARCHTYPE="ppc" ;;
  49         ppc) ARCHTYPE="ppc" ;;
  50         s390) ARCHTYPE="s390" ;;
  51         s390x) ARCHTYPE="s390" ;;
  52         sparc64) ARCHTYPE="sparc64" ;;
  53         alpha*) ARCHTYPE="alpha" ;;
  54         ia64) ARCHTYPE="gcc" ;;
  55         arm*) ARCHTYPE="arm" ;;
  56         *) ARCHTYPE="unknown";;
  57 esac
  58
  59 UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
  60 ARCHSRC=urcu/arch_$ARCHTYPE.h
  61 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
  62         APISRC=tests/api_gcc.h
  63 else
  64         APISRC=tests/api_$ARCHTYPE.h
  65 fi
  66 if test "$ARCHTYPE" == "armv7l"; then
  67         CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
  68 fi
  69
  70 AC_SUBST(ARCHTYPE)
  71 AC_SUBST(SUBARCHTYPE)
  72
  73 [
  74 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
  75 #For now, using lock; addl compatibility mode even for i686, because the
  76 #Pentium III is seen as a i686, but lacks mfence instruction.
  77 #Only using fence for x86_64.
  78 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
  79 ]
  80         AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
  81 [
  82 fi
  83 ]
  84
  85 AC_MSG_CHECKING([sys_futex()])
  86 AC_TRY_COMPILE(
  87 [
  88 #include <sys/syscall.h>
  89 ],
  90 [
  91 #ifndef __NR_futex
  92 #error "futexes not available"
  93 #endif
  94 ],
  95 [
  96         AC_MSG_RESULT([yes])
  97         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
  98         compat_futex_test=0
  99 ]
 100 ,
 101 [
 102         AC_MSG_RESULT([no])
 103         compat_futex_test=1
 104 ]
 105 )
 106
 107 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
 108
 109 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 110
 111 [
 112 if test "x$SUBARCHTYPE" = xx86compat; then
 113 ]
 114         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 115 [
 116 fi
 117 ]
 118
 119 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
 120                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
 121
 122 [
 123 if test "$def_smp_support" = "no"; then
 124         echo "SMP support disabled."
 125 else
 126 ]
 127         AC_DEFINE([CONFIG_RCU_SMP], [1])
 128 [
 129         echo "SMP support enabled."
 130 fi
 131 ]
 132
 133 # From the sched_setaffinity(2)'s man page:
 134 # ~~~~
 135 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 136 # The library interfaces were introduced in glibc 2.3.  Initially, the
 137 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 138 # the cpuset size argument was removed, but this argument was
 139 # restored in glibc 2.3.4.
 140 # ~~~~
 141
 142 # In addition to that, some vendors ported the system call to 2.4
 143 # kernels.
 144
 145 # Furthermore, when the function first appeared, the MASK argument was
 146 # an unsigned long pointer, while later it was made into a cpu_set_t
 147 # pointer.  Systems that have the cpu_set_t version also should have
 148 # the CPU_ZERO, CPU_SET, etc. macros.
 149
 150 # All this mess means we have to cater for at least 3 different
 151 # sched_setaffinity prototypes:
 152
 153 # ~~~~
 154 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 155 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 156 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 157 # ~~~~
 158
 159 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
 160 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
 161 dnl sched_setaffinity bits differently.
 162 saved_CFLAGS=$CFLAGS
 163 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 164
 165 # First check if the function is available at all.
 166 AC_CHECK_FUNCS(
 167   [sched_setaffinity],
 168   [ # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 169     # then we have the first version using unsigned long, and no
 170     # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 171     # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 172     # should also be present, but we confirm nonetheless.
 173
 174     AC_CHECK_TYPES(
 175       [cpu_set_t],
 176       [ # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 177         AC_MSG_CHECKING([whether CPU_ZERO works])
 178         AH_TEMPLATE([HAVE_CPU_ZERO],
 179                     [Define to 1 if we have CPU_ZERO and if it works])
 180         AC_COMPILE_IFELSE(
 181           [AC_LANG_PROGRAM(
 182             [#define _GNU_SOURCE
 183             #include <sched.h>],
 184             [cpu_set_t foo; CPU_ZERO (&foo);])
 185           ],
 186           [ # Works!
 187             AC_DEFINE(HAVE_CPU_ZERO, 1)
 188             AC_MSG_RESULT([yes])
 189           ],
 190           [AC_MSG_RESULT([no])]
 191         )
 192
 193         # Check how many arguments does sched_setaffinity take.
 194         # Should be 3 or 2.
 195         AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 196         AC_COMPILE_IFELSE(
 197           [AC_LANG_PROGRAM(
 198             [#include <sched.h>],
 199             [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
 200           ],
 201           [sched_set_affinity_args=3],
 202           [sched_set_affinity_args=2])
 203         AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 204          [Define to sched_setaffinity's number of arguments.])
 205         AC_MSG_RESULT([$sched_set_affinity_args])
 206       ],
 207       [ # No cpu_set_t, always 3 args.
 208         AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
 209       [#include <sched.h>]
 210     )
 211   ]
 212 )
 213
 214 CFLAGS=$saved_CFLAGS
 215
 216 AC_CONFIG_LINKS([
 217         urcu/arch.h:$ARCHSRC
 218         urcu/uatomic_arch.h:$UATOMICSRC
 219         tests/api.h:$APISRC
 220 ])
 221 AC_CONFIG_FILES([
 222         Makefile
 223         tests/Makefile
 224 ])
 225 AC_OUTPUT