configure.ac

   1 AC_PREREQ(2.59)
   2 AC_INIT([userspace-rcu],[0.8.0],[mathieu dot desnoyers at efficios dot com], [], [http://liburcu.org/])
   3
   4 # Following the numbering scheme proposed by libtool for the library version
   5 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
   6 AC_SUBST([URCU_LIBRARY_VERSION], [3:0:0])
   7
   8 AC_CONFIG_SRCDIR([urcu.h])
   9 AC_CONFIG_HEADERS([config.h urcu/config.h])
  10 AC_CONFIG_AUX_DIR([config])
  11 AC_CONFIG_MACRO_DIR([m4])
  12
  13 AC_CANONICAL_TARGET
  14 AC_CANONICAL_HOST
  15
  16 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
  17 AM_MAINTAINER_MODE([enable])
  18
  19 # Enable silent rules if available (Introduced in AM 1.11)
  20 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  21
  22 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.])
  23 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  24 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  25 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
  26 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
  27 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
  28
  29 # Allow overriding storage used for TLS variables.
  30 AC_ARG_ENABLE([compiler-tls],
  31         AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
  32         [def_compiler_tls=$enableval],
  33         [def_compiler_tls="yes"])
  34
  35 # If not overridden, use ax_tls.m4 to check if TLS is available.
  36 AS_IF([test "x$def_compiler_tls" = "xyes"],
  37         [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
  38         [:])
  39
  40 AS_IF([test "x$def_tls_detect" = "x"],
  41         [:],
  42         [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
  43
  44 # Checks for C compiler
  45 AC_USE_SYSTEM_EXTENSIONS
  46 AC_PROG_CC
  47 AC_PROG_CC_STDC
  48
  49 # Checks for programs.
  50 AC_PROG_MAKE_SET
  51 AC_CHECK_PROGS(NPROC, [nproc gnproc])
  52 LT_INIT
  53
  54 # Checks for typedefs, structures, and compiler characteristics.
  55 AC_C_INLINE
  56 AC_TYPE_PID_T
  57 AC_TYPE_SIZE_T
  58 AC_TYPE_INT32_T
  59 AC_TYPE_UINT32_T
  60 AC_TYPE_UINT64_T
  61 AC_TYPE_UINT8_T
  62
  63 AX_C___ATTRIBUTE__
  64 AS_IF([test "x$ax_cv___attribute__" = "xyes"],
  65         [:],
  66         [AC_MSG_ERROR([The compiler does not support __attribute__ extensions])])
  67
  68 AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
  69 LIBS="$PTHREAD_LIBS $LIBS"
  70 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
  71 CC="$PTHREAD_CC"
  72
  73 # Checks for library functions.
  74 AC_FUNC_MALLOC
  75 AC_FUNC_MMAP
  76 AC_CHECK_FUNCS(
  77         [memset gettimeofday munmap sched_getcpu getcpuid strtoul sysconf gettid memeset strerror]
  78 )
  79
  80 # Check for headers
  81 AC_CHECK_HEADERS([limits.h stddef.h sys/time.h])
  82
  83 # Find arch type
  84 AS_CASE([$host_cpu],
  85         [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
  86         [i486], [ARCHTYPE="x86"],
  87         [i586], [ARCHTYPE="x86"],
  88         [i686], [ARCHTYPE="x86"],
  89         [amd64], [ARCHTYPE="x86"],
  90         [x86_64], [ARCHTYPE="x86"],
  91         [powerpc], [ARCHTYPE="ppc"],
  92         [ppc64], [ARCHTYPE="ppc"],
  93         [powerpc64], [ARCHTYPE="ppc"],
  94         [powerpc64le], [ARCHTYPE="ppc"],
  95         [ppc], [ARCHTYPE="ppc"],
  96         [s390], [ARCHTYPE="s390"],
  97         [s390x], [ARCHTYPE="s390"],
  98         [sparc], [ARCHTYPE="sparc64"],
  99         [sparc64], [ARCHTYPE="sparc64"],
 100         [alpha*], [ARCHTYPE="alpha"],
 101         [ia64], [ARCHTYPE="ia64"],
 102         [arm*], [ARCHTYPE="arm"],
 103         [aarch64], [ARCHTYPE="aarch64"],
 104         [mips*], [ARCHTYPE="mips"],
 105         [tile*], [ARCHTYPE="tile"],
 106         [hppa*], [ARCHTYPE="hppa"],
 107         [ARCHTYPE="unknown"]
 108 )
 109
 110 AS_CASE([$host],[*-*-linux-androideabi],
 111         [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
 112         [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
 113 )
 114
 115 AC_SUBST(ARCHTYPE)
 116 AC_SUBST(SUBARCHTYPE)
 117
 118 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
 119 ARCHSRC=urcu/arch/$ARCHTYPE.h
 120
 121 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
 122         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 123 ])
 124
 125 AS_IF([test "$host_cpu" = "armv7l"],[
 126         CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
 127 ])
 128
 129 # ARM-specific checks
 130 AS_IF([test "x$ARCHTYPE" = "xarm"],[
 131         AC_MSG_CHECKING([for dmb instruction])
 132         AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 133                                 int main()
 134                                 {
 135                                         asm volatile("dmb":::"memory");
 136                                         return 0;
 137                                 }
 138                 ]])
 139         ],[
 140                 AC_MSG_RESULT([yes])
 141                 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
 142         ],[
 143                 AC_MSG_RESULT([no])
 144         ])
 145 ])
 146
 147 # Tile-specific checks
 148 AS_IF([echo "$host_cpu" | grep "^tile"],[
 149         AC_MSG_CHECKING([for Tile architecture type])
 150         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 151                                 #ifndef __tilegx__
 152                                 #error
 153                                 #endif
 154                 ]])
 155         ],[
 156                 AC_MSG_RESULT([ok])
 157         ],[
 158                 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
 159         ])
 160 ])
 161
 162 # x86-specific checks
 163 AS_IF([test "x$ARCHTYPE" = "xx86"],[
 164         AC_MSG_CHECKING([if architecture really supports the mfence instruction])
 165         #For now, using lock; addl compatibility mode even for i686, because the
 166         #Pentium III is seen as a i686, but lacks mfence instruction.
 167         #Only using fence for x86_64.
 168         #
 169         #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
 170         #variant but lacks fence instructions.
 171         AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[
 172                 AC_MSG_RESULT([yes])
 173                 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 174         ],[
 175                 AC_MSG_RESULT([no])
 176         ])
 177 ])
 178
 179 # Check if sys_futex() is available
 180 AC_MSG_CHECKING([for sys_futex()])
 181 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 182                 #include <sys/syscall.h>
 183                 #ifndef __NR_futex
 184                 #error "futexes not available"
 185                 #endif
 186         ]])
 187 ],[
 188         AC_MSG_RESULT([yes])
 189         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 190         compat_futex_test=0
 191 ],[
 192         AC_MSG_RESULT([no])
 193         compat_futex_test=1
 194 ])
 195
 196 # Check for pthread
 197 AC_CHECK_LIB([pthread], [pthread_create],
 198         [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
 199         [AC_CHECK_LIB([c], [pthread_create],
 200                 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
 201                 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
 202         )]
 203 )
 204
 205 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
 206 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
 207 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
 208
 209 # smp-support configure option
 210 AC_ARG_ENABLE([smp-support],
 211         AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
 212         [def_smp_support=$enableval],
 213         [def_smp_support="yes"])
 214 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
 215
 216
 217 # From the sched_setaffinity(2)'s man page:
 218 # ~~~~
 219 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 220 # The library interfaces were introduced in glibc 2.3.  Initially, the
 221 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 222 # the cpuset size argument was removed, but this argument was
 223 # restored in glibc 2.3.4.
 224 # ~~~~
 225
 226 # In addition to that, some vendors ported the system call to 2.4
 227 # kernels.
 228
 229 # Furthermore, when the function first appeared, the MASK argument was
 230 # an unsigned long pointer, while later it was made into a cpu_set_t
 231 # pointer.  Systems that have the cpu_set_t version also should have
 232 # the CPU_ZERO, CPU_SET, etc. macros.
 233
 234 # All this mess means we have to cater for at least 3 different
 235 # sched_setaffinity prototypes:
 236
 237 # ~~~~
 238 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 239 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 240 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 241 # ~~~~
 242
 243 # Since we define _GNU_SOURCE in the sources, must do so too in the
 244 # autoconf tests, as defining _GNU_SOURCE or not exposes
 245 # sched_setaffinity bits differently.
 246 saved_CFLAGS=$CFLAGS
 247 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 248
 249 AC_CHECK_TYPES([cpu_set_t],
 250         [have_cpu_set_t="yes"],
 251         [have_cpu_set_t="no"],
 252         [#include <sched.h>])
 253
 254 # Confirm that we have CPU_ZERO, and it actually works.
 255 AC_MSG_CHECKING([whether CPU_ZERO works])
 256 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
 257 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 258                 #define _GNU_SOURCE
 259                 #include <sched.h>
 260                 int main()
 261                 {
 262                         cpu_set_t foo; CPU_ZERO(&foo);
 263                         return 0;
 264                 }
 265         ]])
 266 ],[
 267         AC_DEFINE(HAVE_CPU_ZERO, 1)
 268         AC_MSG_RESULT([yes])
 269 ],[
 270         AC_MSG_RESULT([no])
 271 ])
 272
 273 # Confirm that we have CPU_SET, and it actually works.
 274 AC_MSG_CHECKING([whether CPU_SET works])
 275 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
 276 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 277                 #define _GNU_SOURCE
 278                 #include <sched.h>
 279                 int main()
 280                 {
 281                         cpu_set_t foo, mask; CPU_SET(0, &foo);
 282                         return 0;
 283                 }
 284         ]])
 285 ],[
 286         AC_DEFINE(HAVE_CPU_SET, 1)
 287         AC_MSG_RESULT([yes])
 288 ],[
 289         AC_MSG_RESULT([no])
 290 ])
 291
 292 # First check if the function is available at all.
 293 AC_CHECK_FUNCS([sched_setaffinity],[
 294         # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 295         # then we have the first version using unsigned long, and no
 296         # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 297         # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 298         # should also be present, but we confirm nonetheless.
 299
 300         AS_IF([test "x$have_cpu_set_t" = "xyes"], [
 301                 # We do have it.
 302                 # Check how many arguments does sched_setaffinity take.
 303                 # Should be 3 or 2.
 304                 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 305                 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 306                                 #include <sched.h>
 307                                 int main()
 308                                 {
 309                                         cpu_set_t foo;
 310                                         sched_setaffinity(0, sizeof (foo), &foo);
 311                                         return 0;
 312                                 }
 313                         ]])
 314                 ],
 315                 [sched_set_affinity_args=3],
 316                 [sched_set_affinity_args=2])
 317                 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
 318                         $sched_set_affinity_args,
 319                         [Defined to sched_setaffinity's number of arguments.])
 320                 AC_MSG_RESULT([$sched_set_affinity_args])
 321         ],[
 322                 # No cpu_set_t, always 3 args.
 323                 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
 324         ])
 325 ])
 326
 327 CFLAGS=$saved_CFLAGS
 328
 329 AC_CONFIG_LINKS([
 330         urcu/arch.h:$ARCHSRC
 331         urcu/uatomic.h:$UATOMICSRC
 332 ])
 333 AC_CONFIG_FILES([
 334         Makefile
 335         doc/Makefile
 336         doc/examples/Makefile
 337         tests/Makefile
 338         tests/common/Makefile
 339         tests/unit/Makefile
 340         tests/benchmark/Makefile
 341         tests/regression/Makefile
 342         tests/regression/regression_tests
 343         tests/utils/Makefile
 344         liburcu.pc
 345         liburcu-bp.pc
 346         liburcu-cds.pc
 347         liburcu-qsbr.pc
 348         liburcu-mb.pc
 349         liburcu-signal.pc
 350 ])
 351 AC_OUTPUT
 352
 353 # Report on selected configure options
 354 AS_IF([test "x$def_smp_support" = "xyes"],[
 355         AS_ECHO("SMP support enabled.")
 356 ],[
 357         AS_ECHO("SMP support disabled.")
 358 ])
 359
 360 AS_IF([test "x$def_tls_detect" = "x"],[
 361         AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
 362 ],[
 363         AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
 364 ])