configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4
   5 AC_INIT([userspace-rcu],[0.8.0],[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], [3:0:0])
  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 AM_MAINTAINER_MODE([enable])
  17 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
  18
  19 m4_include([config/ax_tls.m4])
  20
  21 AC_CONFIG_SRCDIR([urcu.h])
  22
  23 AC_CONFIG_HEADERS([config.h urcu/config.h])
  24
  25 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.])
  26 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
  27 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
  28 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
  29 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
  30 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
  31
  32 # Allow overriding storage used for TLS variables.
  33 AC_ARG_ENABLE([compiler-tls],
  34         AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
  35         [def_compiler_tls=$enableval],
  36         [def_compiler_tls="yes"])
  37
  38 # If not overridden, use ax_tls.m4 to check if TLS is available.
  39 AS_IF([test "x$def_compiler_tls" = "xyes"],
  40         [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
  41         [:])
  42
  43 AS_IF([test "x$def_tls_detect" = "x"],
  44         [:],
  45         [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
  46
  47 # Checks for programs.
  48 AC_PROG_CC
  49 AC_PROG_MAKE_SET
  50 LT_INIT
  51
  52 # Checks for typedefs, structures, and compiler characteristics.
  53 AC_C_INLINE
  54 AC_TYPE_PID_T
  55 AC_TYPE_SIZE_T
  56
  57 # Checks for library functions.
  58 AC_FUNC_MALLOC
  59 AC_FUNC_MMAP
  60 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf gettid])
  61
  62 # Find arch type
  63 AS_CASE([$host_cpu],
  64         [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
  65         [i486], [ARCHTYPE="x86"],
  66         [i586], [ARCHTYPE="x86"],
  67         [i686], [ARCHTYPE="x86"],
  68         [amd64], [ARCHTYPE="x86"],
  69         [x86_64], [ARCHTYPE="x86"],
  70         [powerpc], [ARCHTYPE="ppc"],
  71         [ppc64], [ARCHTYPE="ppc"],
  72         [powerpc64], [ARCHTYPE="ppc"],
  73         [powerpc64le], [ARCHTYPE="gcc"],
  74         [ppc], [ARCHTYPE="ppc"],
  75         [s390], [ARCHTYPE="s390"],
  76         [s390x], [ARCHTYPE="s390"],
  77         [sparc], [ARCHTYPE="sparc64"],
  78         [sparc64], [ARCHTYPE="sparc64"],
  79         [alpha*], [ARCHTYPE="alpha"],
  80         [ia64], [ARCHTYPE="gcc"],
  81         [arm*], [ARCHTYPE="arm"],
  82         [aarch64], [ARCHTYPE="gcc"],
  83         [mips*], [ARCHTYPE="mips"],
  84         [tile*], [ARCHTYPE="gcc"],
  85         [hppa*], [ARCHTYPE="hppa"],
  86         [ARCHTYPE="unknown"]
  87 )
  88
  89 AS_CASE([$host],[*-*-linux-androideabi],
  90         [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
  91         [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
  92 )
  93
  94 AC_SUBST(ARCHTYPE)
  95 AC_SUBST(SUBARCHTYPE)
  96
  97 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
  98 ARCHSRC=urcu/arch/$ARCHTYPE.h
  99
 100 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
 101         AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
 102 ])
 103
 104 AS_IF([test "$host_cpu" = "armv7l"],[
 105         CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
 106 ])
 107
 108 # ARM-specific checks
 109 AS_IF([test "x$ARCHTYPE" = "xarm"],[
 110         AC_MSG_CHECKING([for dmb instruction])
 111         AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 112                                 int main()
 113                                 {
 114                                         asm volatile("dmb":::"memory");
 115                                         return 0;
 116                                 }
 117                 ]])
 118         ],[
 119                 AC_MSG_RESULT([yes])
 120                 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
 121         ],[
 122                 AC_MSG_RESULT([no])
 123         ])
 124 ])
 125
 126 # Tile-specific checks
 127 AS_IF([echo "$host_cpu" | grep "^tile"],[
 128         AC_MSG_CHECKING([for Tile architecture type])
 129         AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 130                                 #ifndef __tilegx__
 131                                 #error
 132                                 #endif
 133                 ]])
 134         ],[
 135                 AC_MSG_RESULT([ok])
 136         ],[
 137                 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.])
 138         ])
 139 ])
 140
 141 # x86-specific checks
 142 AS_IF([test "x$ARCHTYPE" = "xx86"],[
 143         AC_MSG_CHECKING([if architecture really supports the mfence instruction])
 144         #For now, using lock; addl compatibility mode even for i686, because the
 145         #Pentium III is seen as a i686, but lacks mfence instruction.
 146         #Only using fence for x86_64.
 147         #
 148         #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
 149         #variant but lacks fence instructions.
 150         AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[
 151                 AC_MSG_RESULT([yes])
 152                 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
 153         ],[
 154                 AC_MSG_RESULT([no])
 155         ])
 156 ])
 157
 158 # Check if sys_futex() is available
 159 AC_MSG_CHECKING([for sys_futex()])
 160 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 161                 #include <sys/syscall.h>
 162                 #ifndef __NR_futex
 163                 #error "futexes not available"
 164                 #endif
 165         ]])
 166 ],[
 167         AC_MSG_RESULT([yes])
 168         AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
 169         compat_futex_test=0
 170 ],[
 171         AC_MSG_RESULT([no])
 172         compat_futex_test=1
 173 ])
 174
 175 # Check for pthread
 176 AC_CHECK_LIB([pthread], [pthread_create],
 177         [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
 178         [AC_CHECK_LIB([c], [pthread_create],
 179                 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
 180                 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
 181         )]
 182 )
 183
 184 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
 185 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
 186 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
 187
 188 # smp-support configure option
 189 AC_ARG_ENABLE([smp-support],
 190         AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
 191         [def_smp_support=$enableval],
 192         [def_smp_support="yes"])
 193 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
 194
 195
 196 # From the sched_setaffinity(2)'s man page:
 197 # ~~~~
 198 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
 199 # The library interfaces were introduced in glibc 2.3.  Initially, the
 200 # glibc interfaces included a cpusetsize argument.  In glibc 2.3.3,
 201 # the cpuset size argument was removed, but this argument was
 202 # restored in glibc 2.3.4.
 203 # ~~~~
 204
 205 # In addition to that, some vendors ported the system call to 2.4
 206 # kernels.
 207
 208 # Furthermore, when the function first appeared, the MASK argument was
 209 # an unsigned long pointer, while later it was made into a cpu_set_t
 210 # pointer.  Systems that have the cpu_set_t version also should have
 211 # the CPU_ZERO, CPU_SET, etc. macros.
 212
 213 # All this mess means we have to cater for at least 3 different
 214 # sched_setaffinity prototypes:
 215
 216 # ~~~~
 217 #  int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
 218 #  int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
 219 #  int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
 220 # ~~~~
 221
 222 # Since we define _GNU_SOURCE in the sources, must do so too in the
 223 # autoconf tests, as defining _GNU_SOURCE or not exposes
 224 # sched_setaffinity bits differently.
 225 saved_CFLAGS=$CFLAGS
 226 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 227
 228 AC_CHECK_TYPES([cpu_set_t],
 229         [have_cpu_set_t="yes"],
 230         [have_cpu_set_t="no"],
 231         [#include <sched.h>])
 232
 233 # Confirm that we have CPU_ZERO, and it actually works.
 234 AC_MSG_CHECKING([whether CPU_ZERO works])
 235 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
 236 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 237                 #define _GNU_SOURCE
 238                 #include <sched.h>
 239                 int main()
 240                 {
 241                         cpu_set_t foo; CPU_ZERO(&foo);
 242                         return 0;
 243                 }
 244         ]])
 245 ],[
 246         AC_DEFINE(HAVE_CPU_ZERO, 1)
 247         AC_MSG_RESULT([yes])
 248 ],[
 249         AC_MSG_RESULT([no])
 250 ])
 251
 252 # Confirm that we have CPU_SET, and it actually works.
 253 AC_MSG_CHECKING([whether CPU_SET works])
 254 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
 255 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 256                 #define _GNU_SOURCE
 257                 #include <sched.h>
 258                 int main()
 259                 {
 260                         cpu_set_t foo, mask; CPU_SET(0, &foo);
 261                         return 0;
 262                 }
 263         ]])
 264 ],[
 265         AC_DEFINE(HAVE_CPU_SET, 1)
 266         AC_MSG_RESULT([yes])
 267 ],[
 268         AC_MSG_RESULT([no])
 269 ])
 270
 271 # First check if the function is available at all.
 272 AC_CHECK_FUNCS([sched_setaffinity],[
 273         # Okay, we have it.  Check if also have cpu_set_t.  If we don't,
 274         # then we have the first version using unsigned long, and no
 275         # CPU_ZERO, etc. macros.  If we do have cpu_set_t, we may have the
 276         # version with 2 or 3 arguments.  In that case, CPU_ZERO, etc.,
 277         # should also be present, but we confirm nonetheless.
 278
 279         AS_IF([test "x$have_cpu_set_t" = "xyes"], [
 280                 # We do have it.
 281                 # Check how many arguments does sched_setaffinity take.
 282                 # Should be 3 or 2.
 283                 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
 284                 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 285                                 #include <sched.h>
 286                                 int main()
 287                                 {
 288                                         cpu_set_t foo;
 289                                         sched_setaffinity(0, sizeof (foo), &foo);
 290                                         return 0;
 291                                 }
 292                         ]])
 293                 ],
 294                 [sched_set_affinity_args=3],
 295                 [sched_set_affinity_args=2])
 296                 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
 297                         $sched_set_affinity_args,
 298                         [Defined to sched_setaffinity's number of arguments.])
 299                 AC_MSG_RESULT([$sched_set_affinity_args])
 300         ],[
 301                 # No cpu_set_t, always 3 args.
 302                 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
 303         ])
 304 ])
 305
 306 CFLAGS=$saved_CFLAGS
 307
 308 AC_CONFIG_LINKS([
 309         urcu/arch.h:$ARCHSRC
 310         urcu/uatomic.h:$UATOMICSRC
 311 ])
 312 AC_CONFIG_FILES([
 313         Makefile
 314         doc/Makefile
 315         doc/examples/Makefile
 316         tests/Makefile
 317         tests/common/Makefile
 318         tests/unit/Makefile
 319         tests/benchmark/Makefile
 320         tests/regression/Makefile
 321         liburcu.pc
 322         liburcu-bp.pc
 323         liburcu-cds.pc
 324         liburcu-qsbr.pc
 325         liburcu-mb.pc
 326         liburcu-signal.pc
 327 ])
 328 AC_OUTPUT
 329
 330 # Report on selected configure options
 331 AS_IF([test "x$def_smp_support" = "xyes"],[
 332         AS_ECHO("SMP support enabled.")
 333 ],[
 334         AS_ECHO("SMP support disabled.")
 335 ])
 336
 337 AS_IF([test "x$def_tls_detect" = "x"],[
 338         AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
 339 ],[
 340         AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
 341 ])