configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu],[0.7.1],[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_CONFIG_MACRO_DIR([config])
  13 AC_CANONICAL_TARGET
  14 AC_CANONICAL_HOST
  15 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
  16 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  17
  18 m4_include([config/ax_tls.m4])
  19
  20 AC_CONFIG_SRCDIR([urcu.h])
  21
  22 AC_CONFIG_HEADERS([config.h urcu/config.h])
  23
  24 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.])
  25 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  26 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  27 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
  28 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
  29 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
  30
  31 AX_TLS([AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls)], [])
  32
  33 # Checks for programs.
  34 AC_PROG_CC
  35 AC_PROG_MAKE_SET
  36 LT_INIT
  37
  38 # Checks for typedefs, structures, and compiler characteristics.
  39 AC_C_INLINE
  40 AC_TYPE_PID_T
  41 AC_TYPE_SIZE_T
  42
  43 # Checks for library functions.
  44 AC_FUNC_MALLOC
  45 AC_FUNC_MMAP
  46 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
  47
  48 # Find arch type
  49 AS_CASE([$host_cpu],
  50         [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
  51         [i486], [ARCHTYPE="x86"],
  52         [i586], [ARCHTYPE="x86"],
  53         [i686], [ARCHTYPE="x86"],
  54         [amd64], [ARCHTYPE="x86"],
  55         [x86_64], [ARCHTYPE="x86"],
  56         [powerpc], [ARCHTYPE="ppc"],
  57         [ppc64], [ARCHTYPE="ppc"],
  58         [powerpc64], [ARCHTYPE="ppc"],
  59         [ppc], [ARCHTYPE="ppc"],
  60         [s390], [ARCHTYPE="s390"],
  61         [s390x], [ARCHTYPE="s390"],
  62         [sparc64], [ARCHTYPE="sparc64"],
  63         [alpha*], [ARCHTYPE="alpha"],
  64         [ia64], [ARCHTYPE="gcc"],
  65         [arm*], [ARCHTYPE="arm"],
  66         [ARCHTYPE="unknown"]
  67 )
  68
  69 AC_SUBST(ARCHTYPE)
  70 AC_SUBST(SUBARCHTYPE)
  71
  72 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  73 ARCHSRC=urcu/arch/$ARCHTYPE.h
  74
  75 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
  76         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
  77 ])
  78
  79 AS_IF([test "$host_cpu" = "armv7l"],[
  80         CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
  81 ])
  82
  83 # ARM-specific checks
  84 AS_IF([test "x$ARCHTYPE" = "xarm"],[
  85         AC_MSG_CHECKING([for dmb instruction])
  86         AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
  87                                 int main()
  88                                 {
  89                                         asm volatile("dmb":::"memory");
  90                                         return 0;
  91                                 }
  92                 ]])
  93         ],[
  94                 AC_MSG_RESULT([yes])
  95                 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
  96         ],[
  97                 AC_MSG_RESULT([no])
  98         ])
  99 ])
 100
 101 # x86-specific checks
 102 AS_IF([test "x$ARCHTYPE" = "xx86"],[
 103         AC_MSG_CHECKING([if architecture really supports the mfence instruction])
 104         #For now, using lock; addl compatibility mode even for i686, because the
 105         #Pentium III is seen as a i686, but lacks mfence instruction.
 106         #Only using fence for x86_64.
 107         AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
 108                 AC_MSG_RESULT([yes])
 109                 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 110         ],[
 111                 AC_MSG_RESULT([no])
 112         ])
 113 ])
 114
 115 # Check if sys_futex() is available
 116 AC_MSG_CHECKING([for sys_futex()])
 117 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 118                 #include <sys/syscall.h>
 119                 #ifndef __NR_futex
 120                 #error "futexes not available"
 121                 #endif
 122         ]])
 123 ],[
 124         AC_MSG_RESULT([yes])
 125         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 126         compat_futex_test=0
 127 ],[
 128         AC_MSG_RESULT([no])
 129         compat_futex_test=1
 130 ])
 131
 132 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
 133 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
 134
 135 # smp-support configure option
 136 AC_ARG_ENABLE([smp-support],
 137         AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
 138         [def_smp_support=$enableval],
 139         [def_smp_support="yes"])
 140 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
 141
 142
 143 # From the sched_setaffinity(2)'s man page:
 144 # ~~~~
 145 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 146 # The library interfaces were introduced in glibc 2.3.  Initially, the
 147 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 148 # the cpuset size argument was removed, but this argument was
 149 # restored in glibc 2.3.4.
 150 # ~~~~
 151
 152 # In addition to that, some vendors ported the system call to 2.4
 153 # kernels.
 154
 155 # Furthermore, when the function first appeared, the MASK argument was
 156 # an unsigned long pointer, while later it was made into a cpu_set_t
 157 # pointer.  Systems that have the cpu_set_t version also should have
 158 # the CPU_ZERO, CPU_SET, etc. macros.
 159
 160 # All this mess means we have to cater for at least 3 different
 161 # sched_setaffinity prototypes:
 162
 163 # ~~~~
 164 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 165 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 166 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 167 # ~~~~
 168
 169 # Since we define _GNU_SOURCE in the sources, must do so too in the
 170 # autoconf tests, as defining _GNU_SOURCE or not exposes
 171 # sched_setaffinity bits differently.
 172 saved_CFLAGS=$CFLAGS
 173 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 174
 175 # First check if the function is available at all.
 176 AC_CHECK_FUNCS([sched_setaffinity],[
 177         # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 178         # then we have the first version using unsigned long, and no
 179         # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 180         # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 181         # should also be present, but we confirm nonetheless.
 182
 183         AC_CHECK_TYPES([cpu_set_t],[
 184                 # We do have it.  Confirm that we have CPU_ZERO, and it actually works.
 185                 AC_MSG_CHECKING([whether CPU_ZERO works])
 186                 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
 187                 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 188                                 #define _GNU_SOURCE
 189                                 #include <sched.h>
 190                                 int main()
 191                                 {
 192                                         cpu_set_t foo; CPU_ZERO (&foo);
 193                                         return 0;
 194                                 }
 195                         ]])
 196                 ],[
 197                         # Works!
 198                         AC_DEFINE(HAVE_CPU_ZERO, 1)
 199                         AC_MSG_RESULT([yes])
 200                 ],[
 201                         AC_MSG_RESULT([no])
 202                 ])
 203
 204                 # Check how many arguments does sched_setaffinity take.
 205                 # Should be 3 or 2.
 206                 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 207                 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 208                                 #include <sched.h>
 209                                 int main()
 210                                 {
 211                                         cpu_set_t foo;
 212                                         sched_setaffinity (0, sizeof (foo), &foo);
 213                                         return 0;
 214                                 }
 215                         ]])
 216                 ],
 217                 [sched_set_affinity_args=3],
 218                 [sched_set_affinity_args=2])
 219                 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
 220                         [Defined to sched_setaffinity's number of arguments.])
 221                 AC_MSG_RESULT([$sched_set_affinity_args])
 222         ],[
 223                 # No cpu_set_t, always 3 args.
 224                 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
 225         ],
 226         [#include <sched.h>])
 227 ])
 228
 229 CFLAGS=$saved_CFLAGS
 230
 231 AC_CONFIG_LINKS([
 232         urcu/arch.h:$ARCHSRC
 233         urcu/uatomic.h:$UATOMICSRC
 234 ])
 235 AC_CONFIG_FILES([
 236         Makefile
 237         doc/Makefile
 238         tests/Makefile
 239         liburcu.pc
 240         liburcu-bp.pc
 241         liburcu-cds.pc
 242         liburcu-qsbr.pc
 243         liburcu-mb.pc
 244         liburcu-signal.pc
 245 ])
 246 AC_OUTPUT
 247
 248 # Report on selected configure options
 249 AS_IF([test "x$def_smp_support" = "xyes"],[
 250         AS_ECHO("SMP support enabled.")
 251 ],[
 252         AS_ECHO("SMP support disabled.")
 253 ])