2 # Process this file with autoconf to produce a configure script.
5 AC_INIT([userspace-rcu],[0.7.4],[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])
12 AC_CONFIG_MACRO_DIR([config])
15 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
16 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
18 m4_include([config/ax_tls.m4])
20 AC_CONFIG_SRCDIR([urcu.h])
22 AC_CONFIG_HEADERS([config.h urcu/config.h])
24 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.])
25 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
26 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
27 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
28 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
29 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
31 AX_TLS(AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls), [:])
33 # Checks for programs.
38 # Checks for typedefs, structures, and compiler characteristics.
43 # Checks for library functions.
46 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
50 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
51 [i486], [ARCHTYPE="x86"],
52 [i586], [ARCHTYPE="x86"],
53 [i686], [ARCHTYPE="x86"],
54 [amd64], [ARCHTYPE="x86"],
55 [x86_64], [ARCHTYPE="x86"],
56 [powerpc], [ARCHTYPE="ppc"],
57 [ppc64], [ARCHTYPE="ppc"],
58 [powerpc64], [ARCHTYPE="ppc"],
59 [ppc], [ARCHTYPE="ppc"],
60 [s390], [ARCHTYPE="s390"],
61 [s390x], [ARCHTYPE="s390"],
62 [sparc64], [ARCHTYPE="sparc64"],
63 [alpha*], [ARCHTYPE="alpha"],
64 [ia64], [ARCHTYPE="gcc"],
65 [arm*], [ARCHTYPE="arm"],
66 [mips*], [ARCHTYPE="mips"],
73 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
74 ARCHSRC=urcu/arch/$ARCHTYPE.h
76 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
77 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
80 AS_IF([test "$host_cpu" = "armv7l"],[
81 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
85 AS_IF([test "x$ARCHTYPE" = "xarm"],[
86 AC_MSG_CHECKING([for dmb instruction])
87 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
90 asm volatile("dmb":::"memory");
96 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
102 # x86-specific checks
103 AS_IF([test "x$ARCHTYPE" = "xx86"],[
104 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
105 #For now, using lock; addl compatibility mode even for i686, because the
106 #Pentium III is seen as a i686, but lacks mfence instruction.
107 #Only using fence for x86_64.
108 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
110 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
116 # Check if sys_futex() is available
117 AC_MSG_CHECKING([for sys_futex()])
118 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
119 #include <sys/syscall.h>
121 #error "futexes not available"
126 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
133 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
134 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
136 # smp-support configure option
137 AC_ARG_ENABLE([smp-support],
138 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
139 [def_smp_support=$enableval],
140 [def_smp_support="yes"])
141 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
144 # From the sched_setaffinity(2)'s man page:
146 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
147 # The library interfaces were introduced in glibc 2.3. Initially, the
148 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
149 # the cpuset size argument was removed, but this argument was
150 # restored in glibc 2.3.4.
153 # In addition to that, some vendors ported the system call to 2.4
156 # Furthermore, when the function first appeared, the MASK argument was
157 # an unsigned long pointer, while later it was made into a cpu_set_t
158 # pointer. Systems that have the cpu_set_t version also should have
159 # the CPU_ZERO, CPU_SET, etc. macros.
161 # All this mess means we have to cater for at least 3 different
162 # sched_setaffinity prototypes:
165 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
166 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
167 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
170 # Since we define _GNU_SOURCE in the sources, must do so too in the
171 # autoconf tests, as defining _GNU_SOURCE or not exposes
172 # sched_setaffinity bits differently.
174 CFLAGS="$CFLAGS -D_GNU_SOURCE"
176 # First check if the function is available at all.
177 AC_CHECK_FUNCS([sched_setaffinity],[
178 # Okay, we have it. Check if also have cpu_set_t. If we don't,
179 # then we have the first version using unsigned long, and no
180 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
181 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
182 # should also be present, but we confirm nonetheless.
184 AC_CHECK_TYPES([cpu_set_t],[
185 # We do have it. Confirm that we have CPU_ZERO, and it actually works.
186 AC_MSG_CHECKING([whether CPU_ZERO works])
187 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
188 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
193 cpu_set_t foo; CPU_ZERO (&foo);
199 AC_DEFINE(HAVE_CPU_ZERO, 1)
205 # Check how many arguments does sched_setaffinity take.
207 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
208 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
213 sched_setaffinity (0, sizeof (foo), &foo);
218 [sched_set_affinity_args=3],
219 [sched_set_affinity_args=2])
220 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
221 [Defined to sched_setaffinity's number of arguments.])
222 AC_MSG_RESULT([$sched_set_affinity_args])
224 # No cpu_set_t, always 3 args.
225 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
227 [#include <sched.h>])
234 urcu/uatomic.h:$UATOMICSRC
249 # Report on selected configure options
250 AS_IF([test "x$def_smp_support" = "xyes"],[
251 AS_ECHO("SMP support enabled.")
253 AS_ECHO("SMP support disabled.")