configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu], [0.6.3], [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 $host_cpu in
  47         i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
  48         i486) ARCHTYPE="x86";;
  49         i586) ARCHTYPE="x86";;
  50         i686) ARCHTYPE="x86";;
  51         x86_64) ARCHTYPE="x86";;
  52         powerpc) ARCHTYPE="ppc" ;;
  53         ppc64) ARCHTYPE="ppc" ;;
  54         powerpc64) ARCHTYPE="ppc" ;;
  55         ppc) ARCHTYPE="ppc" ;;
  56         s390) ARCHTYPE="s390" ;;
  57         s390x) ARCHTYPE="s390" ;;
  58         sparc64) ARCHTYPE="sparc64" ;;
  59         alpha*) ARCHTYPE="alpha" ;;
  60         ia64) ARCHTYPE="gcc" ;;
  61         arm*) ARCHTYPE="arm" ;;
  62         *) ARCHTYPE="unknown";;
  63 esac
  64
  65 if test "x$ARCHTYPE" = "xarm" ; then
  66 AC_MSG_CHECKING([checking for dmb instruction])
  67 AC_TRY_COMPILE(
  68 [
  69 ],
  70 [
  71 asm volatile("dmb":::"memory");
  72 ],
  73 [
  74         AC_MSG_RESULT([yes])
  75         AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
  76 ]
  77 ,
  78 [
  79         AC_MSG_RESULT([no])
  80 ]
  81 )
  82 fi
  83
  84 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  85 ARCHSRC=urcu/arch/$ARCHTYPE.h
  86 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
  87         APISRC=tests/api_gcc.h
  88 else
  89         APISRC=tests/api_$ARCHTYPE.h
  90 fi
  91 if test "$ARCHTYPE" == "armv7l"; then
  92         CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
  93 fi
  94
  95 AC_SUBST(ARCHTYPE)
  96 AC_SUBST(SUBARCHTYPE)
  97
  98 [
  99 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
 100 #For now, using lock; addl compatibility mode even for i686, because the
 101 #Pentium III is seen as a i686, but lacks mfence instruction.
 102 #Only using fence for x86_64.
 103 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
 104 ]
 105         AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 106 [
 107 fi
 108 ]
 109
 110 AC_MSG_CHECKING([sys_futex()])
 111 AC_TRY_COMPILE(
 112 [
 113 #include <sys/syscall.h>
 114 ],
 115 [
 116 #ifndef __NR_futex
 117 #error "futexes not available"
 118 #endif
 119 ],
 120 [
 121         AC_MSG_RESULT([yes])
 122         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 123         compat_futex_test=0
 124 ]
 125 ,
 126 [
 127         AC_MSG_RESULT([no])
 128         compat_futex_test=1
 129 ]
 130 )
 131
 132 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
 133
 134 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 135
 136 [
 137 if test "x$SUBARCHTYPE" = xx86compat; then
 138 ]
 139         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 140 [
 141 fi
 142 ]
 143
 144 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
 145                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
 146
 147 [
 148 if test "$def_smp_support" = "no"; then
 149         echo "SMP support disabled."
 150 else
 151 ]
 152         AC_DEFINE([CONFIG_RCU_SMP], [1])
 153 [
 154         echo "SMP support enabled."
 155 fi
 156 ]
 157
 158 # From the sched_setaffinity(2)'s man page:
 159 # ~~~~
 160 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 161 # The library interfaces were introduced in glibc 2.3.  Initially, the
 162 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 163 # the cpuset size argument was removed, but this argument was
 164 # restored in glibc 2.3.4.
 165 # ~~~~
 166
 167 # In addition to that, some vendors ported the system call to 2.4
 168 # kernels.
 169
 170 # Furthermore, when the function first appeared, the MASK argument was
 171 # an unsigned long pointer, while later it was made into a cpu_set_t
 172 # pointer.  Systems that have the cpu_set_t version also should have
 173 # the CPU_ZERO, CPU_SET, etc. macros.
 174
 175 # All this mess means we have to cater for at least 3 different
 176 # sched_setaffinity prototypes:
 177
 178 # ~~~~
 179 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 180 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 181 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 182 # ~~~~
 183
 184 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
 185 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
 186 dnl sched_setaffinity bits differently.
 187 saved_CFLAGS=$CFLAGS
 188 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 189
 190 # First check if the function is available at all.
 191 AC_CHECK_FUNCS(
 192   [sched_setaffinity],
 193   [ # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 194     # then we have the first version using unsigned long, and no
 195     # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 196     # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 197     # should also be present, but we confirm nonetheless.
 198
 199     AC_CHECK_TYPES(
 200       [cpu_set_t],
 201       [ # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 202         AC_MSG_CHECKING([whether CPU_ZERO works])
 203         AH_TEMPLATE([HAVE_CPU_ZERO],
 204                     [Define to 1 if we have CPU_ZERO and if it works])
 205         AC_COMPILE_IFELSE(
 206           [AC_LANG_PROGRAM(
 207             [#define _GNU_SOURCE
 208             #include <sched.h>],
 209             [cpu_set_t foo; CPU_ZERO (&foo);])
 210           ],
 211           [ # Works!
 212             AC_DEFINE(HAVE_CPU_ZERO, 1)
 213             AC_MSG_RESULT([yes])
 214           ],
 215           [AC_MSG_RESULT([no])]
 216         )
 217
 218         # Check how many arguments does sched_setaffinity take.
 219         # Should be 3 or 2.
 220         AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 221         AC_COMPILE_IFELSE(
 222           [AC_LANG_PROGRAM(
 223             [#include <sched.h>],
 224             [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
 225           ],
 226           [sched_set_affinity_args=3],
 227           [sched_set_affinity_args=2])
 228         AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 229          [Define to sched_setaffinity's number of arguments.])
 230         AC_MSG_RESULT([$sched_set_affinity_args])
 231       ],
 232       [ # No cpu_set_t, always 3 args.
 233         AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
 234       [#include <sched.h>]
 235     )
 236   ]
 237 )
 238
 239 CFLAGS=$saved_CFLAGS
 240
 241 AC_CONFIG_LINKS([
 242         urcu/arch.h:$ARCHSRC
 243         urcu/uatomic.h:$UATOMICSRC
 244         tests/api.h:$APISRC
 245 ])
 246 AC_CONFIG_FILES([
 247         Makefile
 248         tests/Makefile
 249         liburcu-cds.pc
 250         liburcu.pc
 251         liburcu-bp.pc
 252         liburcu-qsbr.pc
 253         liburcu-mb.pc
 254         liburcu-signal.pc
 255 ])
 256 AC_OUTPUT