Version 0.8.11
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
5AC_INIT([userspace-rcu],[0.8.11],[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
9AC_SUBST([URCU_LIBRARY_VERSION], [3:0:1])
10
11AC_CONFIG_AUX_DIR([config])
12AC_CONFIG_MACRO_DIR([config])
13AC_CANONICAL_TARGET
14AC_CANONICAL_HOST
15AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
16m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17
18m4_include([config/ax_tls.m4])
19
20AC_CONFIG_SRCDIR([urcu.h])
21
22AC_CONFIG_HEADERS([config.h urcu/config.h])
23
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.])
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.])
29AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
30
31# Allow overriding storage used for TLS variables.
32AC_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=$enableval],
35 [def_compiler_tls="yes"])
36
37# If not overridden, use ax_tls.m4 to check if TLS is available.
38AS_IF([test "x$def_compiler_tls" = "xyes"],
39 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
40 [:])
41
42AS_IF([test "x$def_tls_detect" = "x"],
43 [:],
44 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
45
46# Checks for programs.
47AC_PROG_CC
48AC_PROG_MAKE_SET
49LT_INIT
50
51# Checks for typedefs, structures, and compiler characteristics.
52AC_C_INLINE
53AC_TYPE_PID_T
54AC_TYPE_SIZE_T
55
56# Checks for library functions.
57AC_FUNC_MMAP
58AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
59
60# AC_FUNC_MALLOC causes problems when cross-compiling.
61#AC_FUNC_MALLOC
62
63# Find arch type
64AS_CASE([$host_cpu],
65 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
66 [i486], [ARCHTYPE="x86"],
67 [i586], [ARCHTYPE="x86"],
68 [i686], [ARCHTYPE="x86"],
69 [amd64], [ARCHTYPE="x86"],
70 [x86_64], [ARCHTYPE="x86"],
71 [powerpc], [ARCHTYPE="ppc"],
72 [ppc64], [ARCHTYPE="ppc"],
73 [powerpc64], [ARCHTYPE="ppc"],
74 [powerpc64le], [ARCHTYPE="gcc"],
75 [ppc], [ARCHTYPE="ppc"],
76 [s390], [ARCHTYPE="s390"],
77 [s390x], [ARCHTYPE="s390"],
78 [sparc], [ARCHTYPE="sparc64"],
79 [sparc64], [ARCHTYPE="sparc64"],
80 [alpha*], [ARCHTYPE="alpha"],
81 [ia64], [ARCHTYPE="gcc"],
82 [arm*], [ARCHTYPE="arm"],
83 [aarch64], [ARCHTYPE="gcc"],
84 [mips*], [ARCHTYPE="mips"],
85 [tile*], [ARCHTYPE="gcc"],
86 [ARCHTYPE="unknown"]
87)
88
89AC_SUBST(ARCHTYPE)
90AC_SUBST(SUBARCHTYPE)
91
92UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
93ARCHSRC=urcu/arch/$ARCHTYPE.h
94
95AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
96 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
97])
98
99AS_IF([test "$host_cpu" = "armv7l"],[
100 AM_CFLAGS="$AM_CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
101])
102
103# ARM-specific checks
104AS_IF([test "x$ARCHTYPE" = "xarm"],[
105 AC_MSG_CHECKING([for dmb instruction])
106 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
107 int main()
108 {
109 asm volatile("dmb":::"memory");
110 return 0;
111 }
112 ]])
113 ],[
114 AC_MSG_RESULT([yes])
115 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
116 ],[
117 AC_MSG_RESULT([no])
118 ])
119])
120
121# Tile-specific checks
122AS_IF([echo "$host_cpu" | grep "^tile"],[
123 AC_MSG_CHECKING([for Tile architecture type])
124 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
125 #ifndef __tilegx__
126 #error
127 #endif
128 ]])
129 ],[
130 AC_MSG_RESULT([ok])
131 ],[
132 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
133 ])
134])
135
136# x86-specific checks
137AS_IF([test "x$ARCHTYPE" = "xx86"],[
138 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
139 #For now, using lock; addl compatibility mode even for i686, because the
140 #Pentium III is seen as a i686, but lacks mfence instruction.
141 #Only using fence for x86_64.
142 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
143 AC_MSG_RESULT([yes])
144 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
145 ],[
146 AC_MSG_RESULT([no])
147 ])
148])
149
150# Check if sys_futex() is available
151AC_MSG_CHECKING([for sys_futex()])
152AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
153 #include <sys/syscall.h>
154 #ifndef __NR_futex
155 #error "futexes not available"
156 #endif
157 ]])
158],[
159 AC_MSG_RESULT([yes])
160 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
161 compat_futex_test=0
162],[
163 AC_MSG_RESULT([no])
164 compat_futex_test=1
165])
166
167AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
168AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
169AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
170
171# smp-support configure option
172AC_ARG_ENABLE([smp-support],
173 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
174 [def_smp_support=$enableval],
175 [def_smp_support="yes"])
176AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
177
178
179# From the sched_setaffinity(2)'s man page:
180# ~~~~
181# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
182# The library interfaces were introduced in glibc 2.3. Initially, the
183# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
184# the cpuset size argument was removed, but this argument was
185# restored in glibc 2.3.4.
186# ~~~~
187
188# In addition to that, some vendors ported the system call to 2.4
189# kernels.
190
191# Furthermore, when the function first appeared, the MASK argument was
192# an unsigned long pointer, while later it was made into a cpu_set_t
193# pointer. Systems that have the cpu_set_t version also should have
194# the CPU_ZERO, CPU_SET, etc. macros.
195
196# All this mess means we have to cater for at least 3 different
197# sched_setaffinity prototypes:
198
199# ~~~~
200# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
201# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
202# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
203# ~~~~
204
205# Since we define _GNU_SOURCE in the sources, must do so too in the
206# autoconf tests, as defining _GNU_SOURCE or not exposes
207# sched_setaffinity bits differently.
208saved_CFLAGS="$CFLAGS"
209CFLAGS="$CFLAGS $AM_CFLAGS -D_GNU_SOURCE"
210
211AC_CHECK_TYPES([cpu_set_t],
212 [have_cpu_set_t="yes"],
213 [have_cpu_set_t="no"],
214 [#include <sched.h>])
215
216# Confirm that we have CPU_ZERO, and it actually works.
217AC_MSG_CHECKING([whether CPU_ZERO works])
218AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
219AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
220 #define _GNU_SOURCE
221 #include <sched.h>
222 int main()
223 {
224 cpu_set_t foo; CPU_ZERO(&foo);
225 return 0;
226 }
227 ]])
228],[
229 AC_DEFINE(HAVE_CPU_ZERO, 1)
230 AC_MSG_RESULT([yes])
231],[
232 AC_MSG_RESULT([no])
233])
234
235# Confirm that we have CPU_SET, and it actually works.
236AC_MSG_CHECKING([whether CPU_SET works])
237AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
238AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
239 #define _GNU_SOURCE
240 #include <sched.h>
241 int main()
242 {
243 cpu_set_t foo, mask; CPU_SET(0, &foo);
244 return 0;
245 }
246 ]])
247],[
248 AC_DEFINE(HAVE_CPU_SET, 1)
249 AC_MSG_RESULT([yes])
250],[
251 AC_MSG_RESULT([no])
252])
253
254# First check if the function is available at all.
255AC_CHECK_FUNCS([sched_setaffinity],[
256 # Okay, we have it. Check if also have cpu_set_t. If we don't,
257 # then we have the first version using unsigned long, and no
258 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
259 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
260 # should also be present, but we confirm nonetheless.
261
262 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
263 # We do have it.
264 # Check how many arguments does sched_setaffinity take.
265 # Should be 3 or 2.
266 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
267 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
268 #include <sched.h>
269 int main()
270 {
271 cpu_set_t foo;
272 sched_setaffinity(0, sizeof (foo), &foo);
273 return 0;
274 }
275 ]])
276 ],
277 [sched_set_affinity_args=3],
278 [sched_set_affinity_args=2])
279 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
280 $sched_set_affinity_args,
281 [Defined to sched_setaffinity's number of arguments.])
282 AC_MSG_RESULT([$sched_set_affinity_args])
283 ],[
284 # No cpu_set_t, always 3 args.
285 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
286 ])
287])
288
289CFLAGS=$saved_CFLAGS
290AC_SUBST(AM_CFLAGS)
291
292AC_CONFIG_LINKS([
293 urcu/arch.h:$ARCHSRC
294 urcu/uatomic.h:$UATOMICSRC
295])
296AC_CONFIG_FILES([
297 Makefile
298 doc/Makefile
299 doc/examples/Makefile
300 tests/Makefile
301 tests/common/Makefile
302 tests/unit/Makefile
303 tests/benchmark/Makefile
304 tests/regression/Makefile
305 liburcu.pc
306 liburcu-bp.pc
307 liburcu-cds.pc
308 liburcu-qsbr.pc
309 liburcu-mb.pc
310 liburcu-signal.pc
311])
312AC_OUTPUT
313
314# Report on selected configure options
315AS_IF([test "x$def_smp_support" = "xyes"],[
316 AS_ECHO("SMP support enabled.")
317],[
318 AS_ECHO("SMP support disabled.")
319])
320
321AS_IF([test "x$def_tls_detect" = "x"],[
322 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
323],[
324 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
325])
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