Use gcc atomics on aarch64/powerpc64le
[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 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], $def_tls_detect)])
45
46 # Checks for programs.
47 AC_PROG_CC
48 AC_PROG_MAKE_SET
49 LT_INIT
50
51 # Checks for typedefs, structures, and compiler characteristics.
52 AC_C_INLINE
53 AC_TYPE_PID_T
54 AC_TYPE_SIZE_T
55
56 # Checks for library functions.
57 AC_FUNC_MALLOC
58 AC_FUNC_MMAP
59 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf gettid])
60
61 # Find arch type
62 AS_CASE([$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 [powerpc64le], [ARCHTYPE="gcc"],
73 [ppc], [ARCHTYPE="ppc"],
74 [s390], [ARCHTYPE="s390"],
75 [s390x], [ARCHTYPE="s390"],
76 [sparc], [ARCHTYPE="sparc64"],
77 [sparc64], [ARCHTYPE="sparc64"],
78 [alpha*], [ARCHTYPE="alpha"],
79 [ia64], [ARCHTYPE="gcc"],
80 [arm*], [ARCHTYPE="arm"],
81 [aarch64], [ARCHTYPE="gcc"],
82 [mips*], [ARCHTYPE="mips"],
83 [tile*], [ARCHTYPE="gcc"],
84 [ARCHTYPE="unknown"]
85 )
86
87 AS_CASE([$host],[*-*-linux-androideabi],
88 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
89 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
90 )
91
92 AC_SUBST(ARCHTYPE)
93 AC_SUBST(SUBARCHTYPE)
94
95 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
96 ARCHSRC=urcu/arch/$ARCHTYPE.h
97
98 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
99 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
100 ])
101
102 AS_IF([test "$host_cpu" = "armv7l"],[
103 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
104 ])
105
106 # ARM-specific checks
107 AS_IF([test "x$ARCHTYPE" = "xarm"],[
108 AC_MSG_CHECKING([for dmb instruction])
109 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
110 int main()
111 {
112 asm volatile("dmb":::"memory");
113 return 0;
114 }
115 ]])
116 ],[
117 AC_MSG_RESULT([yes])
118 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
119 ],[
120 AC_MSG_RESULT([no])
121 ])
122 ])
123
124 # Tile-specific checks
125 AS_IF([echo "$host_cpu" | grep "^tile"],[
126 AC_MSG_CHECKING([for Tile architecture type])
127 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
128 #ifndef __tilegx__
129 #error
130 #endif
131 ]])
132 ],[
133 AC_MSG_RESULT([ok])
134 ],[
135 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.])
136 ])
137 ])
138
139 # x86-specific checks
140 AS_IF([test "x$ARCHTYPE" = "xx86"],[
141 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
142 #For now, using lock; addl compatibility mode even for i686, because the
143 #Pentium III is seen as a i686, but lacks mfence instruction.
144 #Only using fence for x86_64.
145 #
146 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
147 #variant but lacks fence instructions.
148 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[
149 AC_MSG_RESULT([yes])
150 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
151 ],[
152 AC_MSG_RESULT([no])
153 ])
154 ])
155
156 # Check if sys_futex() is available
157 AC_MSG_CHECKING([for sys_futex()])
158 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
159 #include <sys/syscall.h>
160 #ifndef __NR_futex
161 #error "futexes not available"
162 #endif
163 ]])
164 ],[
165 AC_MSG_RESULT([yes])
166 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
167 compat_futex_test=0
168 ],[
169 AC_MSG_RESULT([no])
170 compat_futex_test=1
171 ])
172
173 # Check for pthread
174 AC_CHECK_LIB([pthread], [pthread_create],
175 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
176 [AC_CHECK_LIB([c], [pthread_create],
177 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
178 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
179 )]
180 )
181
182 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
183 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
184 AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
185
186 # smp-support configure option
187 AC_ARG_ENABLE([smp-support],
188 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
189 [def_smp_support=$enableval],
190 [def_smp_support="yes"])
191 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
192
193
194 # From the sched_setaffinity(2)'s man page:
195 # ~~~~
196 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
197 # The library interfaces were introduced in glibc 2.3. Initially, the
198 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
199 # the cpuset size argument was removed, but this argument was
200 # restored in glibc 2.3.4.
201 # ~~~~
202
203 # In addition to that, some vendors ported the system call to 2.4
204 # kernels.
205
206 # Furthermore, when the function first appeared, the MASK argument was
207 # an unsigned long pointer, while later it was made into a cpu_set_t
208 # pointer. Systems that have the cpu_set_t version also should have
209 # the CPU_ZERO, CPU_SET, etc. macros.
210
211 # All this mess means we have to cater for at least 3 different
212 # sched_setaffinity prototypes:
213
214 # ~~~~
215 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
216 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
217 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
218 # ~~~~
219
220 # Since we define _GNU_SOURCE in the sources, must do so too in the
221 # autoconf tests, as defining _GNU_SOURCE or not exposes
222 # sched_setaffinity bits differently.
223 saved_CFLAGS=$CFLAGS
224 CFLAGS="$CFLAGS -D_GNU_SOURCE"
225
226 AC_CHECK_TYPES([cpu_set_t],
227 [have_cpu_set_t="yes"],
228 [have_cpu_set_t="no"],
229 [#include <sched.h>])
230
231 # Confirm that we have CPU_ZERO, and it actually works.
232 AC_MSG_CHECKING([whether CPU_ZERO works])
233 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
234 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
235 #define _GNU_SOURCE
236 #include <sched.h>
237 int main()
238 {
239 cpu_set_t foo; CPU_ZERO(&foo);
240 return 0;
241 }
242 ]])
243 ],[
244 AC_DEFINE(HAVE_CPU_ZERO, 1)
245 AC_MSG_RESULT([yes])
246 ],[
247 AC_MSG_RESULT([no])
248 ])
249
250 # Confirm that we have CPU_SET, and it actually works.
251 AC_MSG_CHECKING([whether CPU_SET works])
252 AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
253 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
254 #define _GNU_SOURCE
255 #include <sched.h>
256 int main()
257 {
258 cpu_set_t foo, mask; CPU_SET(0, &foo);
259 return 0;
260 }
261 ]])
262 ],[
263 AC_DEFINE(HAVE_CPU_SET, 1)
264 AC_MSG_RESULT([yes])
265 ],[
266 AC_MSG_RESULT([no])
267 ])
268
269 # First check if the function is available at all.
270 AC_CHECK_FUNCS([sched_setaffinity],[
271 # Okay, we have it. Check if also have cpu_set_t. If we don't,
272 # then we have the first version using unsigned long, and no
273 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
274 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
275 # should also be present, but we confirm nonetheless.
276
277 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
278 # We do have it.
279 # Check how many arguments does sched_setaffinity take.
280 # Should be 3 or 2.
281 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
282 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
283 #include <sched.h>
284 int main()
285 {
286 cpu_set_t foo;
287 sched_setaffinity(0, sizeof (foo), &foo);
288 return 0;
289 }
290 ]])
291 ],
292 [sched_set_affinity_args=3],
293 [sched_set_affinity_args=2])
294 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
295 $sched_set_affinity_args,
296 [Defined to sched_setaffinity's number of arguments.])
297 AC_MSG_RESULT([$sched_set_affinity_args])
298 ],[
299 # No cpu_set_t, always 3 args.
300 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
301 ])
302 ])
303
304 CFLAGS=$saved_CFLAGS
305
306 AC_CONFIG_LINKS([
307 urcu/arch.h:$ARCHSRC
308 urcu/uatomic.h:$UATOMICSRC
309 ])
310 AC_CONFIG_FILES([
311 Makefile
312 doc/Makefile
313 doc/examples/Makefile
314 tests/Makefile
315 tests/common/Makefile
316 tests/unit/Makefile
317 tests/benchmark/Makefile
318 tests/regression/Makefile
319 liburcu.pc
320 liburcu-bp.pc
321 liburcu-cds.pc
322 liburcu-qsbr.pc
323 liburcu-mb.pc
324 liburcu-signal.pc
325 ])
326 AC_OUTPUT
327
328 # Report on selected configure options
329 AS_IF([test "x$def_smp_support" = "xyes"],[
330 AS_ECHO("SMP support enabled.")
331 ],[
332 AS_ECHO("SMP support disabled.")
333 ])
334
335 AS_IF([test "x$def_tls_detect" = "x"],[
336 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
337 ],[
338 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
339 ])
This page took 0.054821 seconds and 4 git commands to generate.