0aae5fd4b2fccdeeac5dbc6414ee7536b4c417bd
[urcu.git] / configure.ac
1 # -*- Autoconf -*-
2 # Process this file with autoconf to produce a configure script.
3
4
5 AC_INIT([userspace-rcu],[0.8.0],[mathieu dot desnoyers at efficios dot com])
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
9 AC_SUBST([URCU_LIBRARY_VERSION], [2:0:0])
10
11 AC_CONFIG_AUX_DIR([config])
12 AC_CONFIG_MACRO_DIR([config])
13 AC_CANONICAL_TARGET
14 AC_CANONICAL_HOST
15 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
16 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17
18 m4_include([config/ax_tls.m4])
19
20 AC_CONFIG_SRCDIR([urcu.h])
21
22 AC_CONFIG_HEADERS([config.h urcu/config.h])
23
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.])
30
31 # Allow overriding storage used for TLS variables.
32 AC_ARG_ENABLE([compiler-tls],
33 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
34 [def_compiler_tls=$enableval],
35 [def_compiler_tls="yes"])
36
37 # If not overridden, use ax_tls.m4 to check if TLS is available.
38 AS_IF([test "x$def_compiler_tls" = "xyes"],
39 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
40 [:])
41
42 AS_IF([test "x$def_tls_detect" = "x"],
43 [:],
44 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
45
46 # Checks for programs.
47 AC_PROG_CC
48 AC_PROG_MAKE_SET
49 LT_INIT
50
51 # Checks for typedefs, structures, and compiler characteristics.
52 AC_C_INLINE
53 AC_TYPE_PID_T
54 AC_TYPE_SIZE_T
55
56 # Checks for library functions.
57 AC_FUNC_MALLOC
58 AC_FUNC_MMAP
59 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
60
61 # Find arch type
62 AS_CASE([$host_cpu],
63 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
64 [i486], [ARCHTYPE="x86"],
65 [i586], [ARCHTYPE="x86"],
66 [i686], [ARCHTYPE="x86"],
67 [amd64], [ARCHTYPE="x86"],
68 [x86_64], [ARCHTYPE="x86"],
69 [powerpc], [ARCHTYPE="ppc"],
70 [ppc64], [ARCHTYPE="ppc"],
71 [powerpc64], [ARCHTYPE="ppc"],
72 [ppc], [ARCHTYPE="ppc"],
73 [s390], [ARCHTYPE="s390"],
74 [s390x], [ARCHTYPE="s390"],
75 [sparc], [ARCHTYPE="sparc64"],
76 [sparc64], [ARCHTYPE="sparc64"],
77 [alpha*], [ARCHTYPE="alpha"],
78 [ia64], [ARCHTYPE="gcc"],
79 [arm*], [ARCHTYPE="arm"],
80 [mips*], [ARCHTYPE="mips"],
81 [tile*], [ARCHTYPE="gcc"],
82 [ARCHTYPE="unknown"]
83 )
84
85 AC_SUBST(ARCHTYPE)
86 AC_SUBST(SUBARCHTYPE)
87
88 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
89 ARCHSRC=urcu/arch/$ARCHTYPE.h
90
91 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
92 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
93 ])
94
95 AS_IF([test "$host_cpu" = "armv7l"],[
96 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
97 ])
98
99 # ARM-specific checks
100 AS_IF([test "x$ARCHTYPE" = "xarm"],[
101 AC_MSG_CHECKING([for dmb instruction])
102 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
103 int main()
104 {
105 asm volatile("dmb":::"memory");
106 return 0;
107 }
108 ]])
109 ],[
110 AC_MSG_RESULT([yes])
111 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
112 ],[
113 AC_MSG_RESULT([no])
114 ])
115 ])
116
117 # Tile-specific checks
118 AS_IF([echo "$host_cpu" | grep "^tile"],[
119 AC_MSG_CHECKING([for Tile architecture type])
120 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
121 #ifndef __tilegx__
122 #error
123 #endif
124 ]])
125 ],[
126 AC_MSG_RESULT([ok])
127 ],[
128 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
129 ])
130 ])
131
132 # x86-specific checks
133 AS_IF([test "x$ARCHTYPE" = "xx86"],[
134 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
135 #For now, using lock; addl compatibility mode even for i686, because the
136 #Pentium III is seen as a i686, but lacks mfence instruction.
137 #Only using fence for x86_64.
138 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
139 AC_MSG_RESULT([yes])
140 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
141 ],[
142 AC_MSG_RESULT([no])
143 ])
144 ])
145
146 # Check if sys_futex() is available
147 AC_MSG_CHECKING([for sys_futex()])
148 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
149 #include <sys/syscall.h>
150 #ifndef __NR_futex
151 #error "futexes not available"
152 #endif
153 ]])
154 ],[
155 AC_MSG_RESULT([yes])
156 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
157 compat_futex_test=0
158 ],[
159 AC_MSG_RESULT([no])
160 compat_futex_test=1
161 ])
162
163 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
164 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
165 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
166
167 # smp-support configure option
168 AC_ARG_ENABLE([smp-support],
169 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
170 [def_smp_support=$enableval],
171 [def_smp_support="yes"])
172 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
173
174
175 # From the sched_setaffinity(2)'s man page:
176 # ~~~~
177 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
178 # The library interfaces were introduced in glibc 2.3. Initially, the
179 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
180 # the cpuset size argument was removed, but this argument was
181 # restored in glibc 2.3.4.
182 # ~~~~
183
184 # In addition to that, some vendors ported the system call to 2.4
185 # kernels.
186
187 # Furthermore, when the function first appeared, the MASK argument was
188 # an unsigned long pointer, while later it was made into a cpu_set_t
189 # pointer. Systems that have the cpu_set_t version also should have
190 # the CPU_ZERO, CPU_SET, etc. macros.
191
192 # All this mess means we have to cater for at least 3 different
193 # sched_setaffinity prototypes:
194
195 # ~~~~
196 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
197 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
198 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
199 # ~~~~
200
201 # Since we define _GNU_SOURCE in the sources, must do so too in the
202 # autoconf tests, as defining _GNU_SOURCE or not exposes
203 # sched_setaffinity bits differently.
204 saved_CFLAGS=$CFLAGS
205 CFLAGS="$CFLAGS -D_GNU_SOURCE"
206
207 AC_CHECK_TYPES([cpu_set_t],
208 [have_cpu_set_t="yes"],
209 [have_cpu_set_t="no"],
210 [#include <sched.h>])
211
212 # Confirm that we have CPU_ZERO, and it actually works.
213 AC_MSG_CHECKING([whether CPU_ZERO works])
214 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
215 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
216 #define _GNU_SOURCE
217 #include <sched.h>
218 int main()
219 {
220 cpu_set_t foo; CPU_ZERO(&foo);
221 return 0;
222 }
223 ]])
224 ],[
225 AC_DEFINE(HAVE_CPU_ZERO, 1)
226 AC_MSG_RESULT([yes])
227 ],[
228 AC_MSG_RESULT([no])
229 ])
230
231 # Confirm that we have CPU_SET, and it actually works.
232 AC_MSG_CHECKING([whether CPU_SET works])
233 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
234 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
235 #define _GNU_SOURCE
236 #include <sched.h>
237 int main()
238 {
239 cpu_set_t foo, mask; CPU_SET(0, &foo);
240 return 0;
241 }
242 ]])
243 ],[
244 AC_DEFINE(HAVE_CPU_SET, 1)
245 AC_MSG_RESULT([yes])
246 ],[
247 AC_MSG_RESULT([no])
248 ])
249
250 # First check if the function is available at all.
251 AC_CHECK_FUNCS([sched_setaffinity],[
252 # Okay, we have it. Check if also have cpu_set_t. If we don't,
253 # then we have the first version using unsigned long, and no
254 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
255 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
256 # should also be present, but we confirm nonetheless.
257
258 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
259 # We do have it.
260 # Check how many arguments does sched_setaffinity take.
261 # Should be 3 or 2.
262 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
263 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
264 #include <sched.h>
265 int main()
266 {
267 cpu_set_t foo;
268 sched_setaffinity(0, sizeof (foo), &foo);
269 return 0;
270 }
271 ]])
272 ],
273 [sched_set_affinity_args=3],
274 [sched_set_affinity_args=2])
275 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
276 $sched_set_affinity_args,
277 [Defined to sched_setaffinity's number of arguments.])
278 AC_MSG_RESULT([$sched_set_affinity_args])
279 ],[
280 # No cpu_set_t, always 3 args.
281 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
282 ])
283 ])
284
285 CFLAGS=$saved_CFLAGS
286
287 AC_CONFIG_LINKS([
288 urcu/arch.h:$ARCHSRC
289 urcu/uatomic.h:$UATOMICSRC
290 ])
291 AC_CONFIG_FILES([
292 Makefile
293 doc/Makefile
294 doc/examples/Makefile
295 tests/Makefile
296 tests/common/Makefile
297 tests/unit/Makefile
298 tests/benchmark/Makefile
299 tests/regression/Makefile
300 liburcu.pc
301 liburcu-bp.pc
302 liburcu-cds.pc
303 liburcu-qsbr.pc
304 liburcu-mb.pc
305 liburcu-signal.pc
306 ])
307 AC_OUTPUT
308
309 # Report on selected configure options
310 AS_IF([test "x$def_smp_support" = "xyes"],[
311 AS_ECHO("SMP support enabled.")
312 ],[
313 AS_ECHO("SMP support disabled.")
314 ])
315
316 AS_IF([test "x$def_tls_detect" = "x"],[
317 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
318 ],[
319 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
320 ])
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