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