Update version to 0.7.2
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
8afbdefc 5AC_INIT([userspace-rcu],[0.7.2],[mathieu dot desnoyers at efficios dot com])
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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
9AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0])
10
48d848c7 11AC_CONFIG_AUX_DIR([config])
a6412536 12AC_CONFIG_MACRO_DIR([config])
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13AC_CANONICAL_TARGET
14AC_CANONICAL_HOST
48d848c7 15AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
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16m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17
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18m4_include([config/ax_tls.m4])
19
48d848c7 20AC_CONFIG_SRCDIR([urcu.h])
7d413817 21
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22AC_CONFIG_HEADERS([config.h urcu/config.h])
23
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24AH_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.])
25AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
26AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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27AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
28AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
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29AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
30
31AX_TLS([AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls)], [])
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32
33# Checks for programs.
34AC_PROG_CC
35AC_PROG_MAKE_SET
b14a378a 36LT_INIT
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37
38# Checks for typedefs, structures, and compiler characteristics.
39AC_C_INLINE
40AC_TYPE_PID_T
41AC_TYPE_SIZE_T
42
43# Checks for library functions.
44AC_FUNC_MALLOC
45AC_FUNC_MMAP
b57aee66 46AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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47
48# Find arch type
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49AS_CASE([$host_cpu],
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 [ARCHTYPE="unknown"]
67)
91b0650a 68
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69AC_SUBST(ARCHTYPE)
70AC_SUBST(SUBARCHTYPE)
5e626e0e 71
a2e7bf9c 72UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 73ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 74
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75AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
76 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
77])
78
79AS_IF([test "$host_cpu" = "armv7l"],[
80 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
81])
48d848c7 82
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83# ARM-specific checks
84AS_IF([test "x$ARCHTYPE" = "xarm"],[
85 AC_MSG_CHECKING([for dmb instruction])
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86 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
87 int main()
88 {
89 asm volatile("dmb":::"memory");
90 return 0;
91 }
92 ]])
93 ],[
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94 AC_MSG_RESULT([yes])
95 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
96 ],[
97 AC_MSG_RESULT([no])
98 ])
99])
100
101# x86-specific checks
102AS_IF([test "x$ARCHTYPE" = "xx86"],[
103 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
104 #For now, using lock; addl compatibility mode even for i686, because the
105 #Pentium III is seen as a i686, but lacks mfence instruction.
106 #Only using fence for x86_64.
107 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
108 AC_MSG_RESULT([yes])
109 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
110 ],[
111 AC_MSG_RESULT([no])
112 ])
113])
114
115# Check if sys_futex() is available
116AC_MSG_CHECKING([for sys_futex()])
fe0707ab 117AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 118 #include <sys/syscall.h>
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119 #ifndef __NR_futex
120 #error "futexes not available"
121 #endif
fe0707ab 122 ]])
a6412536 123],[
0854ccff 124 AC_MSG_RESULT([yes])
02be5561 125 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 126 compat_futex_test=0
91b0650a 127],[
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128 AC_MSG_RESULT([no])
129 compat_futex_test=1
91b0650a 130])
0854ccff 131
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132AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
133AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
0854ccff 134
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135# smp-support configure option
136AC_ARG_ENABLE([smp-support],
137 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
138 [def_smp_support=$enableval],
139 [def_smp_support="yes"])
140AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 141
48d848c7 142
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143# From the sched_setaffinity(2)'s man page:
144# ~~~~
145# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
146# The library interfaces were introduced in glibc 2.3. Initially, the
147# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
148# the cpuset size argument was removed, but this argument was
149# restored in glibc 2.3.4.
150# ~~~~
151
152# In addition to that, some vendors ported the system call to 2.4
153# kernels.
154
155# Furthermore, when the function first appeared, the MASK argument was
156# an unsigned long pointer, while later it was made into a cpu_set_t
157# pointer. Systems that have the cpu_set_t version also should have
158# the CPU_ZERO, CPU_SET, etc. macros.
159
160# All this mess means we have to cater for at least 3 different
161# sched_setaffinity prototypes:
162
163# ~~~~
164# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
165# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
166# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
167# ~~~~
168
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169# Since we define _GNU_SOURCE in the sources, must do so too in the
170# autoconf tests, as defining _GNU_SOURCE or not exposes
171# sched_setaffinity bits differently.
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172saved_CFLAGS=$CFLAGS
173CFLAGS="$CFLAGS -D_GNU_SOURCE"
174
175# First check if the function is available at all.
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176AC_CHECK_FUNCS([sched_setaffinity],[
177 # Okay, we have it. Check if also have cpu_set_t. If we don't,
178 # then we have the first version using unsigned long, and no
179 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
180 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
181 # should also be present, but we confirm nonetheless.
182
183 AC_CHECK_TYPES([cpu_set_t],[
184 # We do have it. Confirm that we have CPU_ZERO, and it actually works.
185 AC_MSG_CHECKING([whether CPU_ZERO works])
186 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
ec5e2d14 187 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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188 #define _GNU_SOURCE
189 #include <sched.h>
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190 int main()
191 {
192 cpu_set_t foo; CPU_ZERO (&foo);
193 return 0;
194 }
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195 ]])
196 ],[
197 # Works!
198 AC_DEFINE(HAVE_CPU_ZERO, 1)
199 AC_MSG_RESULT([yes])
200 ],[
201 AC_MSG_RESULT([no])
202 ])
203
204 # Check how many arguments does sched_setaffinity take.
205 # Should be 3 or 2.
206 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 207 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 208 #include <sched.h>
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209 int main()
210 {
211 cpu_set_t foo;
212 sched_setaffinity (0, sizeof (foo), &foo);
213 return 0;
214 }
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215 ]])
216 ],
217 [sched_set_affinity_args=3],
218 [sched_set_affinity_args=2])
219 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
220 [Defined to sched_setaffinity's number of arguments.])
221 AC_MSG_RESULT([$sched_set_affinity_args])
222 ],[
223 # No cpu_set_t, always 3 args.
224 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
225 ],
226 [#include <sched.h>])
227])
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228
229CFLAGS=$saved_CFLAGS
230
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231AC_CONFIG_LINKS([
232 urcu/arch.h:$ARCHSRC
a2e7bf9c 233 urcu/uatomic.h:$UATOMICSRC
455b809a 234])
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235AC_CONFIG_FILES([
236 Makefile
fe999c05 237 doc/Makefile
48d848c7 238 tests/Makefile
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239 liburcu.pc
240 liburcu-bp.pc
a6412536 241 liburcu-cds.pc
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242 liburcu-qsbr.pc
243 liburcu-mb.pc
244 liburcu-signal.pc
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245])
246AC_OUTPUT
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247
248# Report on selected configure options
249AS_IF([test "x$def_smp_support" = "xyes"],[
250 AS_ECHO("SMP support enabled.")
251],[
252 AS_ECHO("SMP support disabled.")
253])
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