2 AC_INIT([userspace-rcu],[0.9.2],[mathieu dot desnoyers at efficios dot com], [], [http://liburcu.org/])
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], [4:0:0])
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])
16 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
17 AM_MAINTAINER_MODE([enable])
19 # Enable silent rules if available (Introduced in AM 1.11)
20 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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.])
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=$enableval],
33 [def_compiler_tls="yes"])
35 # If not overridden, use ax_tls.m4 to check if TLS is available.
36 AS_IF([test "x$def_compiler_tls" = "xyes"],
37 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
40 AS_IF([test "x$def_tls_detect" = "x"],
42 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
44 # Checks for C compiler
45 AC_USE_SYSTEM_EXTENSIONS
49 # Checks for programs.
52 AC_CHECK_PROGS(NPROC, [nproc gnproc])
55 # Checks for typedefs, structures, and compiler characteristics.
67 AS_IF([test "x$ax_cv___attribute__" = "xyes"],
69 [AC_MSG_ERROR([The compiler does not support __attribute__ extensions])])
71 AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
72 LIBS="$PTHREAD_LIBS $LIBS"
73 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
76 # Checks for library functions.
105 [k1om], [ARCHTYPE="x86"],
106 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
107 [i486], [ARCHTYPE="x86"],
108 [i586], [ARCHTYPE="x86"],
109 [i686], [ARCHTYPE="x86"],
110 [amd64], [ARCHTYPE="x86"],
111 [x86_64], [ARCHTYPE="x86"],
112 [powerpc], [ARCHTYPE="ppc"],
113 [ppc64], [ARCHTYPE="ppc"],
114 [powerpc64], [ARCHTYPE="ppc"],
115 [powerpc64le], [ARCHTYPE="ppc"],
116 [ppc], [ARCHTYPE="ppc"],
117 [s390], [ARCHTYPE="s390"],
118 [s390x], [ARCHTYPE="s390"],
119 [sparc], [ARCHTYPE="sparc64"],
120 [sparc64], [ARCHTYPE="sparc64"],
121 [alpha*], [ARCHTYPE="alpha"],
122 [ia64], [ARCHTYPE="ia64"],
123 [arm*], [ARCHTYPE="arm"],
124 [aarch64*], [ARCHTYPE="aarch64"],
125 [mips*], [ARCHTYPE="mips"],
126 [tile*], [ARCHTYPE="tile"],
127 [hppa*], [ARCHTYPE="hppa"],
131 AS_CASE([$host],[*-*-linux-androideabi],
132 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
133 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
136 AS_CASE([$host],[*-cygwin*],
137 [AM_CONDITIONAL(USE_CYGWIN, true)],
138 [AM_CONDITIONAL(USE_CYGWIN, false)]
142 AC_SUBST(SUBARCHTYPE)
144 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
145 ARCHSRC=urcu/arch/$ARCHTYPE.h
147 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
148 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
151 AS_IF([test "$host_cpu" = "armv7l"],[
152 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
155 # ARM-specific checks
156 AS_IF([test "x$ARCHTYPE" = "xarm"],[
157 AC_MSG_CHECKING([for dmb instruction])
158 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
161 asm volatile("dmb":::"memory");
167 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
173 # Tile-specific checks
174 AS_IF([echo "$host_cpu" | grep "^tile"],[
175 AC_MSG_CHECKING([for Tile architecture type])
176 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
184 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.])
188 # x86-specific checks
189 AS_IF([test "x$ARCHTYPE" = "xx86"],[
190 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
191 #For now, using lock; addl compatibility mode even for i686, because the
192 #Pentium III is seen as a i686, but lacks mfence instruction.
193 #Only using fence for x86_64.
195 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
196 #variant but lacks fence instructions.
197 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om" -a "x$host_cpu" != "xk1om"],[
199 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
205 # Check if sys_futex() is available
206 AC_MSG_CHECKING([for sys_futex()])
207 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
208 #include <sys/syscall.h>
210 #error "futexes not available"
215 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
222 # Search for clock_gettime
223 AC_SEARCH_LIBS([clock_gettime], [rt], [],
224 [AC_MSG_ERROR([Cannot find clock_gettime function.])]
228 AC_CHECK_LIB([pthread], [pthread_create],
229 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
230 [AC_CHECK_LIB([c], [pthread_create],
231 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
232 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
236 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
237 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
238 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
240 # smp-support configure option
241 AC_ARG_ENABLE([smp-support],
242 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
243 [def_smp_support=$enableval],
244 [def_smp_support="yes"])
245 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
248 # From the sched_setaffinity(2)'s man page:
250 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
251 # The library interfaces were introduced in glibc 2.3. Initially, the
252 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
253 # the cpuset size argument was removed, but this argument was
254 # restored in glibc 2.3.4.
257 # In addition to that, some vendors ported the system call to 2.4
260 # Furthermore, when the function first appeared, the MASK argument was
261 # an unsigned long pointer, while later it was made into a cpu_set_t
262 # pointer. Systems that have the cpu_set_t version also should have
263 # the CPU_ZERO, CPU_SET, etc. macros.
265 # All this mess means we have to cater for at least 3 different
266 # sched_setaffinity prototypes:
269 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
270 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
271 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
274 # Since we define _GNU_SOURCE in the sources, must do so too in the
275 # autoconf tests, as defining _GNU_SOURCE or not exposes
276 # sched_setaffinity bits differently.
278 CFLAGS="$CFLAGS -D_GNU_SOURCE"
280 AC_CHECK_TYPES([cpu_set_t],
281 [have_cpu_set_t="yes"],
282 [have_cpu_set_t="no"],
283 [#include <sched.h>])
285 # Confirm that we have CPU_ZERO, and it actually works.
286 AC_MSG_CHECKING([whether CPU_ZERO works])
287 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
288 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
293 cpu_set_t foo; CPU_ZERO(&foo);
298 AC_DEFINE(HAVE_CPU_ZERO, 1)
304 # Confirm that we have CPU_SET, and it actually works.
305 AC_MSG_CHECKING([whether CPU_SET works])
306 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
307 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
312 cpu_set_t foo, mask; CPU_SET(0, &foo);
317 AC_DEFINE(HAVE_CPU_SET, 1)
323 # First check if the function is available at all.
324 AC_CHECK_FUNCS([sched_setaffinity],[
325 # Okay, we have it. Check if also have cpu_set_t. If we don't,
326 # then we have the first version using unsigned long, and no
327 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
328 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
329 # should also be present, but we confirm nonetheless.
331 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
333 # Check how many arguments does sched_setaffinity take.
335 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
336 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
341 sched_setaffinity(0, sizeof (foo), &foo);
346 [sched_set_affinity_args=3],
347 [sched_set_affinity_args=2])
348 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
349 $sched_set_affinity_args,
350 [Defined to sched_setaffinity's number of arguments.])
351 AC_MSG_RESULT([$sched_set_affinity_args])
353 # No cpu_set_t, always 3 args.
354 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
362 urcu/uatomic.h:$UATOMICSRC
367 doc/examples/Makefile
369 tests/common/Makefile
371 tests/benchmark/Makefile
372 tests/regression/Makefile
373 tests/regression/regression_tests
384 # Report on selected configure options
385 AS_IF([test "x$def_smp_support" = "xyes"],[
386 AS_ECHO("SMP support enabled.")
388 AS_ECHO("SMP support disabled.")
391 AS_IF([test "x$def_tls_detect" = "x"],[
392 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
394 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")