wfcqueue: implement mutex-free splice
[urcu.git] / configure.ac
1 # -*- Autoconf -*-
2 # Process this file with autoconf to produce a configure script.
3
4
5 AC_INIT([userspace-rcu],[0.7.4],[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 [sparc64], [ARCHTYPE="sparc64"],
76 [alpha*], [ARCHTYPE="alpha"],
77 [ia64], [ARCHTYPE="gcc"],
78 [arm*], [ARCHTYPE="arm"],
79 [mips*], [ARCHTYPE="mips"],
80 [ARCHTYPE="unknown"]
81 )
82
83 AC_SUBST(ARCHTYPE)
84 AC_SUBST(SUBARCHTYPE)
85
86 UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
87 ARCHSRC=urcu/arch/$ARCHTYPE.h
88
89 AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
90 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
91 ])
92
93 AS_IF([test "$host_cpu" = "armv7l"],[
94 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
95 ])
96
97 # ARM-specific checks
98 AS_IF([test "x$ARCHTYPE" = "xarm"],[
99 AC_MSG_CHECKING([for dmb instruction])
100 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
101 int main()
102 {
103 asm volatile("dmb":::"memory");
104 return 0;
105 }
106 ]])
107 ],[
108 AC_MSG_RESULT([yes])
109 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
110 ],[
111 AC_MSG_RESULT([no])
112 ])
113 ])
114
115 # x86-specific checks
116 AS_IF([test "x$ARCHTYPE" = "xx86"],[
117 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
118 #For now, using lock; addl compatibility mode even for i686, because the
119 #Pentium III is seen as a i686, but lacks mfence instruction.
120 #Only using fence for x86_64.
121 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
122 AC_MSG_RESULT([yes])
123 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
124 ],[
125 AC_MSG_RESULT([no])
126 ])
127 ])
128
129 # Check if sys_futex() is available
130 AC_MSG_CHECKING([for sys_futex()])
131 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
132 #include <sys/syscall.h>
133 #ifndef __NR_futex
134 #error "futexes not available"
135 #endif
136 ]])
137 ],[
138 AC_MSG_RESULT([yes])
139 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
140 compat_futex_test=0
141 ],[
142 AC_MSG_RESULT([no])
143 compat_futex_test=1
144 ])
145
146 AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
147 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
148
149 # smp-support configure option
150 AC_ARG_ENABLE([smp-support],
151 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
152 [def_smp_support=$enableval],
153 [def_smp_support="yes"])
154 AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
155
156
157 # From the sched_setaffinity(2)'s man page:
158 # ~~~~
159 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
160 # The library interfaces were introduced in glibc 2.3. Initially, the
161 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
162 # the cpuset size argument was removed, but this argument was
163 # restored in glibc 2.3.4.
164 # ~~~~
165
166 # In addition to that, some vendors ported the system call to 2.4
167 # kernels.
168
169 # Furthermore, when the function first appeared, the MASK argument was
170 # an unsigned long pointer, while later it was made into a cpu_set_t
171 # pointer. Systems that have the cpu_set_t version also should have
172 # the CPU_ZERO, CPU_SET, etc. macros.
173
174 # All this mess means we have to cater for at least 3 different
175 # sched_setaffinity prototypes:
176
177 # ~~~~
178 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
179 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
180 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
181 # ~~~~
182
183 # Since we define _GNU_SOURCE in the sources, must do so too in the
184 # autoconf tests, as defining _GNU_SOURCE or not exposes
185 # sched_setaffinity bits differently.
186 saved_CFLAGS=$CFLAGS
187 CFLAGS="$CFLAGS -D_GNU_SOURCE"
188
189 # First check if the function is available at all.
190 AC_CHECK_FUNCS([sched_setaffinity],[
191 # Okay, we have it. Check if also have cpu_set_t. If we don't,
192 # then we have the first version using unsigned long, and no
193 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
194 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
195 # should also be present, but we confirm nonetheless.
196
197 AC_CHECK_TYPES([cpu_set_t],[
198 # We do have it. Confirm that we have CPU_ZERO, and it actually works.
199 AC_MSG_CHECKING([whether CPU_ZERO works])
200 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
201 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
202 #define _GNU_SOURCE
203 #include <sched.h>
204 int main()
205 {
206 cpu_set_t foo; CPU_ZERO (&foo);
207 return 0;
208 }
209 ]])
210 ],[
211 # Works!
212 AC_DEFINE(HAVE_CPU_ZERO, 1)
213 AC_MSG_RESULT([yes])
214 ],[
215 AC_MSG_RESULT([no])
216 ])
217
218 # Check how many arguments does sched_setaffinity take.
219 # Should be 3 or 2.
220 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
221 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
222 #include <sched.h>
223 int main()
224 {
225 cpu_set_t foo;
226 sched_setaffinity (0, sizeof (foo), &foo);
227 return 0;
228 }
229 ]])
230 ],
231 [sched_set_affinity_args=3],
232 [sched_set_affinity_args=2])
233 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
234 [Defined to sched_setaffinity's number of arguments.])
235 AC_MSG_RESULT([$sched_set_affinity_args])
236 ],[
237 # No cpu_set_t, always 3 args.
238 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
239 ],
240 [#include <sched.h>])
241 ])
242
243 CFLAGS=$saved_CFLAGS
244
245 AC_CONFIG_LINKS([
246 urcu/arch.h:$ARCHSRC
247 urcu/uatomic.h:$UATOMICSRC
248 ])
249 AC_CONFIG_FILES([
250 Makefile
251 doc/Makefile
252 tests/Makefile
253 liburcu.pc
254 liburcu-bp.pc
255 liburcu-cds.pc
256 liburcu-qsbr.pc
257 liburcu-mb.pc
258 liburcu-signal.pc
259 ])
260 AC_OUTPUT
261
262 # Report on selected configure options
263 AS_IF([test "x$def_smp_support" = "xyes"],[
264 AS_ECHO("SMP support enabled.")
265 ],[
266 AS_ECHO("SMP support disabled.")
267 ])
268
269 AS_IF([test "x$def_tls_detect" = "x"],[
270 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
271 ],[
272 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
273 ])
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