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[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], [3:0:0])
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 AM_MAINTAINER_MODE([enable])
17 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
18
19 m4_include([config/ax_tls.m4])
20
21 AC_CONFIG_SRCDIR([urcu.h])
22
23 AC_CONFIG_HEADERS([config.h urcu/config.h])
24
25 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.])
26 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
27 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
28 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
29 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
30 AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
31
32 # Allow overriding storage used for TLS variables.
33 AC_ARG_ENABLE([compiler-tls],
34 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
35 [def_compiler_tls=$enableval],
36 [def_compiler_tls="yes"])
37
38 # If not overridden, use ax_tls.m4 to check if TLS is available.
39 AS_IF([test "x$def_compiler_tls" = "xyes"],
40 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
41 [:])
42
43 AS_IF([test "x$def_tls_detect" = "x"],
44 [:],
45 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
46
47 # Checks for programs.
48 AC_PROG_CC
49 AC_PROG_MAKE_SET
50 LT_INIT
51
52 # Checks for typedefs, structures, and compiler characteristics.
53 AC_C_INLINE
54 AC_TYPE_PID_T
55 AC_TYPE_SIZE_T
56
57 # Checks for library functions.
58 AC_FUNC_MALLOC
59 AC_FUNC_MMAP
60 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf gettid])
61
62 # Find arch type
63 AS_CASE([$host_cpu],
64 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
65 [i486], [ARCHTYPE="x86"],
66 [i586], [ARCHTYPE="x86"],
67 [i686], [ARCHTYPE="x86"],
68 [amd64], [ARCHTYPE="x86"],
69 [x86_64], [ARCHTYPE="x86"],
70 [powerpc], [ARCHTYPE="ppc"],
71 [ppc64], [ARCHTYPE="ppc"],
72 [powerpc64], [ARCHTYPE="ppc"],
73 [powerpc64le], [ARCHTYPE="gcc"],
74 [ppc], [ARCHTYPE="ppc"],
75 [s390], [ARCHTYPE="s390"],
76 [s390x], [ARCHTYPE="s390"],
77 [sparc], [ARCHTYPE="sparc64"],
78 [sparc64], [ARCHTYPE="sparc64"],
79 [alpha*], [ARCHTYPE="alpha"],
80 [ia64], [ARCHTYPE="gcc"],
81 [arm*], [ARCHTYPE="arm"],
82 [aarch64], [ARCHTYPE="gcc"],
83 [mips*], [ARCHTYPE="mips"],
84 [tile*], [ARCHTYPE="gcc"],
85 [ARCHTYPE="unknown"]
86 )
87
88 AS_CASE([$host],[*-*-linux-androideabi],
89 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
90 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
91 )
92
93 AC_SUBST(ARCHTYPE)
94 AC_SUBST(SUBARCHTYPE)
95
96 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
97 ARCHSRC=urcu/arch/$ARCHTYPE.h
98
99 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
100 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
101 ])
102
103 AS_IF([test "$host_cpu" = "armv7l"],[
104 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
105 ])
106
107 # ARM-specific checks
108 AS_IF([test "x$ARCHTYPE" = "xarm"],[
109 AC_MSG_CHECKING([for dmb instruction])
110 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
111 int main()
112 {
113 asm volatile("dmb":::"memory");
114 return 0;
115 }
116 ]])
117 ],[
118 AC_MSG_RESULT([yes])
119 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
120 ],[
121 AC_MSG_RESULT([no])
122 ])
123 ])
124
125 # Tile-specific checks
126 AS_IF([echo "$host_cpu" | grep "^tile"],[
127 AC_MSG_CHECKING([for Tile architecture type])
128 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
129 #ifndef __tilegx__
130 #error
131 #endif
132 ]])
133 ],[
134 AC_MSG_RESULT([ok])
135 ],[
136 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.])
137 ])
138 ])
139
140 # x86-specific checks
141 AS_IF([test "x$ARCHTYPE" = "xx86"],[
142 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
143 #For now, using lock; addl compatibility mode even for i686, because the
144 #Pentium III is seen as a i686, but lacks mfence instruction.
145 #Only using fence for x86_64.
146 #
147 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
148 #variant but lacks fence instructions.
149 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[
150 AC_MSG_RESULT([yes])
151 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
152 ],[
153 AC_MSG_RESULT([no])
154 ])
155 ])
156
157 # Check if sys_futex() is available
158 AC_MSG_CHECKING([for sys_futex()])
159 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
160 #include <sys/syscall.h>
161 #ifndef __NR_futex
162 #error "futexes not available"
163 #endif
164 ]])
165 ],[
166 AC_MSG_RESULT([yes])
167 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
168 compat_futex_test=0
169 ],[
170 AC_MSG_RESULT([no])
171 compat_futex_test=1
172 ])
173
174 # Check for pthread
175 AC_CHECK_LIB([pthread], [pthread_create],
176 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
177 [AC_CHECK_LIB([c], [pthread_create],
178 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
179 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
180 )]
181 )
182
183 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
184 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
185 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
186
187 # smp-support configure option
188 AC_ARG_ENABLE([smp-support],
189 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
190 [def_smp_support=$enableval],
191 [def_smp_support="yes"])
192 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
193
194
195 # From the sched_setaffinity(2)'s man page:
196 # ~~~~
197 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
198 # The library interfaces were introduced in glibc 2.3. Initially, the
199 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
200 # the cpuset size argument was removed, but this argument was
201 # restored in glibc 2.3.4.
202 # ~~~~
203
204 # In addition to that, some vendors ported the system call to 2.4
205 # kernels.
206
207 # Furthermore, when the function first appeared, the MASK argument was
208 # an unsigned long pointer, while later it was made into a cpu_set_t
209 # pointer. Systems that have the cpu_set_t version also should have
210 # the CPU_ZERO, CPU_SET, etc. macros.
211
212 # All this mess means we have to cater for at least 3 different
213 # sched_setaffinity prototypes:
214
215 # ~~~~
216 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
217 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
218 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
219 # ~~~~
220
221 # Since we define _GNU_SOURCE in the sources, must do so too in the
222 # autoconf tests, as defining _GNU_SOURCE or not exposes
223 # sched_setaffinity bits differently.
224 saved_CFLAGS=$CFLAGS
225 CFLAGS="$CFLAGS -D_GNU_SOURCE"
226
227 AC_CHECK_TYPES([cpu_set_t],
228 [have_cpu_set_t="yes"],
229 [have_cpu_set_t="no"],
230 [#include <sched.h>])
231
232 # Confirm that we have CPU_ZERO, and it actually works.
233 AC_MSG_CHECKING([whether CPU_ZERO works])
234 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
235 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
236 #define _GNU_SOURCE
237 #include <sched.h>
238 int main()
239 {
240 cpu_set_t foo; CPU_ZERO(&foo);
241 return 0;
242 }
243 ]])
244 ],[
245 AC_DEFINE(HAVE_CPU_ZERO, 1)
246 AC_MSG_RESULT([yes])
247 ],[
248 AC_MSG_RESULT([no])
249 ])
250
251 # Confirm that we have CPU_SET, and it actually works.
252 AC_MSG_CHECKING([whether CPU_SET works])
253 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
254 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
255 #define _GNU_SOURCE
256 #include <sched.h>
257 int main()
258 {
259 cpu_set_t foo, mask; CPU_SET(0, &foo);
260 return 0;
261 }
262 ]])
263 ],[
264 AC_DEFINE(HAVE_CPU_SET, 1)
265 AC_MSG_RESULT([yes])
266 ],[
267 AC_MSG_RESULT([no])
268 ])
269
270 # First check if the function is available at all.
271 AC_CHECK_FUNCS([sched_setaffinity],[
272 # Okay, we have it. Check if also have cpu_set_t. If we don't,
273 # then we have the first version using unsigned long, and no
274 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
275 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
276 # should also be present, but we confirm nonetheless.
277
278 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
279 # We do have it.
280 # Check how many arguments does sched_setaffinity take.
281 # Should be 3 or 2.
282 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
283 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
284 #include <sched.h>
285 int main()
286 {
287 cpu_set_t foo;
288 sched_setaffinity(0, sizeof (foo), &foo);
289 return 0;
290 }
291 ]])
292 ],
293 [sched_set_affinity_args=3],
294 [sched_set_affinity_args=2])
295 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
296 $sched_set_affinity_args,
297 [Defined to sched_setaffinity's number of arguments.])
298 AC_MSG_RESULT([$sched_set_affinity_args])
299 ],[
300 # No cpu_set_t, always 3 args.
301 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
302 ])
303 ])
304
305 CFLAGS=$saved_CFLAGS
306
307 AC_CONFIG_LINKS([
308 urcu/arch.h:$ARCHSRC
309 urcu/uatomic.h:$UATOMICSRC
310 ])
311 AC_CONFIG_FILES([
312 Makefile
313 doc/Makefile
314 doc/examples/Makefile
315 tests/Makefile
316 tests/common/Makefile
317 tests/unit/Makefile
318 tests/benchmark/Makefile
319 tests/regression/Makefile
320 liburcu.pc
321 liburcu-bp.pc
322 liburcu-cds.pc
323 liburcu-qsbr.pc
324 liburcu-mb.pc
325 liburcu-signal.pc
326 ])
327 AC_OUTPUT
328
329 # Report on selected configure options
330 AS_IF([test "x$def_smp_support" = "xyes"],[
331 AS_ECHO("SMP support enabled.")
332 ],[
333 AS_ECHO("SMP support disabled.")
334 ])
335
336 AS_IF([test "x$def_tls_detect" = "x"],[
337 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
338 ],[
339 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
340 ])
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