2 # Process this file with autoconf to produce a configure script.
5 AC_INIT([userspace-rcu], [0.6.4], [mathieu dot desnoyers at efficios dot com])
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], [1:0:0])
11 AC_CONFIG_AUX_DIR([config])
14 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
15 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17 AC_CONFIG_SRCDIR([urcu.h])
20 AC_CONFIG_HEADERS([config.h urcu/config.h])
23 AM_PATH_GLIB_2_0(2.22.0, ,AC_MSG_ERROR([glib is required in order to compile BabelTrace - download it from ftp://ftp.gtk.org/pub/gtk]) , gmodule)
25 # Keep at the end to do not pollute installed header.
26 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.])
27 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
28 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
29 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
30 cmpxchg instruction.])
31 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
33 # Checks for programs.
38 # Checks for typedefs, structures, and compiler characteristics.
43 # Checks for library functions.
46 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
50 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
51 i486) ARCHTYPE="x86";;
52 i586) ARCHTYPE="x86";;
53 i686) ARCHTYPE="x86";;
54 x86_64) ARCHTYPE="x86";;
55 powerpc) ARCHTYPE="ppc" ;;
56 ppc64) ARCHTYPE="ppc" ;;
57 powerpc64) ARCHTYPE="ppc" ;;
58 ppc) ARCHTYPE="ppc" ;;
59 s390) ARCHTYPE="s390" ;;
60 s390x) ARCHTYPE="s390" ;;
61 sparc64) ARCHTYPE="sparc64" ;;
62 alpha*) ARCHTYPE="alpha" ;;
63 ia64) ARCHTYPE="gcc" ;;
64 arm*) ARCHTYPE="arm" ;;
65 *) ARCHTYPE="unknown";;
68 if test "x$ARCHTYPE" = "xarm" ; then
69 AC_MSG_CHECKING([checking for dmb instruction])
74 asm volatile("dmb":::"memory");
78 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
87 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
88 ARCHSRC=urcu/arch/$ARCHTYPE.h
89 if test "$ARCHTYPE" == "armv7l"; then
90 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
97 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
98 #For now, using lock; addl compatibility mode even for i686, because the
99 #Pentium III is seen as a i686, but lacks mfence instruction.
100 #Only using fence for x86_64.
101 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
103 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
108 AC_MSG_CHECKING([sys_futex()])
111 #include <sys/syscall.h>
115 #error "futexes not available"
120 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
130 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
132 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
135 if test "x$SUBARCHTYPE" = xx86compat; then
137 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
142 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
143 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
146 if test "$def_smp_support" = "no"; then
147 echo "SMP support disabled."
150 AC_DEFINE([CONFIG_RCU_SMP], [1])
152 echo "SMP support enabled."
156 # From the sched_setaffinity(2)'s man page:
158 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
159 # The library interfaces were introduced in glibc 2.3. Initially, the
160 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
161 # the cpuset size argument was removed, but this argument was
162 # restored in glibc 2.3.4.
165 # In addition to that, some vendors ported the system call to 2.4
168 # Furthermore, when the function first appeared, the MASK argument was
169 # an unsigned long pointer, while later it was made into a cpu_set_t
170 # pointer. Systems that have the cpu_set_t version also should have
171 # the CPU_ZERO, CPU_SET, etc. macros.
173 # All this mess means we have to cater for at least 3 different
174 # sched_setaffinity prototypes:
177 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
178 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
179 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
182 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
183 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
184 dnl sched_setaffinity bits differently.
186 CFLAGS="$CFLAGS -D_GNU_SOURCE"
188 # First check if the function is available at all.
191 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
192 # then we have the first version using unsigned long, and no
193 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
194 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
195 # should also be present, but we confirm nonetheless.
199 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
200 AC_MSG_CHECKING([whether CPU_ZERO works])
201 AH_TEMPLATE([HAVE_CPU_ZERO],
202 [Define to 1 if we have CPU_ZERO and if it works])
207 [cpu_set_t foo; CPU_ZERO (&foo);])
210 AC_DEFINE(HAVE_CPU_ZERO, 1)
213 [AC_MSG_RESULT([no])]
216 # Check how many arguments does sched_setaffinity take.
218 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
221 [#include <sched.h>],
222 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
224 [sched_set_affinity_args=3],
225 [sched_set_affinity_args=2])
226 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
227 [Define to sched_setaffinity's number of arguments.])
228 AC_MSG_RESULT([$sched_set_affinity_args])
230 [ # No cpu_set_t, always 3 args.
231 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
241 urcu/uatomic.h:$UATOMICSRC