2 AC_INIT([userspace-rcu],[0.9.0],[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 $PTHREAD_CFLAGS"
76 # Checks for library functions.
106 [k1om], [ARCHTYPE="x86"],
107 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
108 [i486], [ARCHTYPE="x86"],
109 [i586], [ARCHTYPE="x86"],
110 [i686], [ARCHTYPE="x86"],
111 [amd64], [ARCHTYPE="x86"],
112 [x86_64], [ARCHTYPE="x86"],
113 [powerpc], [ARCHTYPE="ppc"],
114 [ppc64], [ARCHTYPE="ppc"],
115 [powerpc64], [ARCHTYPE="ppc"],
116 [powerpc64le], [ARCHTYPE="ppc"],
117 [ppc], [ARCHTYPE="ppc"],
118 [s390], [ARCHTYPE="s390"],
119 [s390x], [ARCHTYPE="s390"],
120 [sparc], [ARCHTYPE="sparc64"],
121 [sparc64], [ARCHTYPE="sparc64"],
122 [alpha*], [ARCHTYPE="alpha"],
123 [ia64], [ARCHTYPE="ia64"],
124 [arm*], [ARCHTYPE="arm"],
125 [aarch64], [ARCHTYPE="aarch64"],
126 [mips*], [ARCHTYPE="mips"],
127 [tile*], [ARCHTYPE="tile"],
128 [hppa*], [ARCHTYPE="hppa"],
132 AS_CASE([$host],[*-*-linux-androideabi],
133 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
134 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
138 AC_SUBST(SUBARCHTYPE)
140 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
141 ARCHSRC=urcu/arch/$ARCHTYPE.h
143 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
144 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
147 AS_IF([test "$host_cpu" = "armv7l"],[
148 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
151 # ARM-specific checks
152 AS_IF([test "x$ARCHTYPE" = "xarm"],[
153 AC_MSG_CHECKING([for dmb instruction])
154 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
157 asm volatile("dmb":::"memory");
163 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
169 # Tile-specific checks
170 AS_IF([echo "$host_cpu" | grep "^tile"],[
171 AC_MSG_CHECKING([for Tile architecture type])
172 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
180 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
184 # x86-specific checks
185 AS_IF([test "x$ARCHTYPE" = "xx86"],[
186 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
187 #For now, using lock; addl compatibility mode even for i686, because the
188 #Pentium III is seen as a i686, but lacks mfence instruction.
189 #Only using fence for x86_64.
191 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
192 #variant but lacks fence instructions.
193 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"],[
195 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
201 # Check if sys_futex() is available
202 AC_MSG_CHECKING([for sys_futex()])
203 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
204 #include <sys/syscall.h>
206 #error "futexes not available"
211 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
219 AC_CHECK_LIB([pthread], [pthread_create],
220 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
221 [AC_CHECK_LIB([c], [pthread_create],
222 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
223 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
227 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
228 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
229 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
231 # smp-support configure option
232 AC_ARG_ENABLE([smp-support],
233 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
234 [def_smp_support=$enableval],
235 [def_smp_support="yes"])
236 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
239 # From the sched_setaffinity(2)'s man page:
241 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
242 # The library interfaces were introduced in glibc 2.3. Initially, the
243 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
244 # the cpuset size argument was removed, but this argument was
245 # restored in glibc 2.3.4.
248 # In addition to that, some vendors ported the system call to 2.4
251 # Furthermore, when the function first appeared, the MASK argument was
252 # an unsigned long pointer, while later it was made into a cpu_set_t
253 # pointer. Systems that have the cpu_set_t version also should have
254 # the CPU_ZERO, CPU_SET, etc. macros.
256 # All this mess means we have to cater for at least 3 different
257 # sched_setaffinity prototypes:
260 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
261 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
262 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
265 # Since we define _GNU_SOURCE in the sources, must do so too in the
266 # autoconf tests, as defining _GNU_SOURCE or not exposes
267 # sched_setaffinity bits differently.
269 CFLAGS="$CFLAGS -D_GNU_SOURCE"
271 AC_CHECK_TYPES([cpu_set_t],
272 [have_cpu_set_t="yes"],
273 [have_cpu_set_t="no"],
274 [#include <sched.h>])
276 # Confirm that we have CPU_ZERO, and it actually works.
277 AC_MSG_CHECKING([whether CPU_ZERO works])
278 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
279 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
284 cpu_set_t foo; CPU_ZERO(&foo);
289 AC_DEFINE(HAVE_CPU_ZERO, 1)
295 # Confirm that we have CPU_SET, and it actually works.
296 AC_MSG_CHECKING([whether CPU_SET works])
297 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
298 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
303 cpu_set_t foo, mask; CPU_SET(0, &foo);
308 AC_DEFINE(HAVE_CPU_SET, 1)
314 # First check if the function is available at all.
315 AC_CHECK_FUNCS([sched_setaffinity],[
316 # Okay, we have it. Check if also have cpu_set_t. If we don't,
317 # then we have the first version using unsigned long, and no
318 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
319 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
320 # should also be present, but we confirm nonetheless.
322 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
324 # Check how many arguments does sched_setaffinity take.
326 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
327 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
332 sched_setaffinity(0, sizeof (foo), &foo);
337 [sched_set_affinity_args=3],
338 [sched_set_affinity_args=2])
339 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
340 $sched_set_affinity_args,
341 [Defined to sched_setaffinity's number of arguments.])
342 AC_MSG_RESULT([$sched_set_affinity_args])
344 # No cpu_set_t, always 3 args.
345 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
353 urcu/uatomic.h:$UATOMICSRC
358 doc/examples/Makefile
360 tests/common/Makefile
362 tests/benchmark/Makefile
363 tests/regression/Makefile
364 tests/regression/regression_tests
375 # Report on selected configure options
376 AS_IF([test "x$def_smp_support" = "xyes"],[
377 AS_ECHO("SMP support enabled.")
379 AS_ECHO("SMP support disabled.")
382 AS_IF([test "x$def_tls_detect" = "x"],[
383 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
385 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")