6b8a35a992aa4f28aae9d354365e976370619c80
[urcu.git] / configure.ac
1 # -*- Autoconf -*-
2 # Process this file with autoconf to produce a configure script.
3
4
5 AC_INIT([userspace-rcu], [0.5.4], [mathieu dot desnoyers at efficios dot com])
6 AC_CONFIG_AUX_DIR([config])
7 AC_CANONICAL_TARGET
8 AC_CANONICAL_HOST
9 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
10 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
11
12 AC_CONFIG_SRCDIR([urcu.h])
13 AM_PROG_MKDIR_P
14
15 AC_CONFIG_HEADERS([config.h urcu/config.h])
16
17 # Keep at the end to do not pollute installed header.
18 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.])
19 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
20 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
21 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
22 cmpxchg instruction.])
23 AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
24
25 # Checks for programs.
26 AC_PROG_CC
27 AC_PROG_MAKE_SET
28 AC_PROG_LIBTOOL
29
30 # Checks for typedefs, structures, and compiler characteristics.
31 AC_C_INLINE
32 AC_TYPE_PID_T
33 AC_TYPE_SIZE_T
34
35 # Checks for library functions.
36 AC_FUNC_MALLOC
37 AC_FUNC_MMAP
38 AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
39
40 # Find arch type
41 case $host_cpu in
42 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
43 i486) ARCHTYPE="x86";;
44 i586) ARCHTYPE="x86";;
45 i686) ARCHTYPE="x86";;
46 x86_64) ARCHTYPE="x86";;
47 powerpc) ARCHTYPE="ppc" ;;
48 ppc64) ARCHTYPE="ppc" ;;
49 powerpc64) ARCHTYPE="ppc" ;;
50 ppc) ARCHTYPE="ppc" ;;
51 s390) ARCHTYPE="s390" ;;
52 s390x) ARCHTYPE="s390" ;;
53 sparc64) ARCHTYPE="sparc64" ;;
54 alpha*) ARCHTYPE="alpha" ;;
55 ia64) ARCHTYPE="gcc" ;;
56 arm*) ARCHTYPE="arm" ;;
57 *) ARCHTYPE="unknown";;
58 esac
59
60 if test "x$ARCHTYPE" = "xarm" ; then
61 AC_MSG_CHECKING([checking for dmb instruction])
62 AC_TRY_COMPILE(
63 [
64 ],
65 [
66 asm volatile("dmb":::"memory");
67 ],
68 [
69 AC_MSG_RESULT([yes])
70 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
71 ]
72 ,
73 [
74 AC_MSG_RESULT([no])
75 ]
76 )
77 fi
78
79 UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
80 ARCHSRC=urcu/arch_$ARCHTYPE.h
81 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
82 APISRC=tests/api_gcc.h
83 else
84 APISRC=tests/api_$ARCHTYPE.h
85 fi
86 if test "$ARCHTYPE" == "armv7l"; then
87 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
88 fi
89
90 AC_SUBST(ARCHTYPE)
91 AC_SUBST(SUBARCHTYPE)
92
93 [
94 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
95 #For now, using lock; addl compatibility mode even for i686, because the
96 #Pentium III is seen as a i686, but lacks mfence instruction.
97 #Only using fence for x86_64.
98 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
99 ]
100 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
101 [
102 fi
103 ]
104
105 AC_MSG_CHECKING([sys_futex()])
106 AC_TRY_COMPILE(
107 [
108 #include <sys/syscall.h>
109 ],
110 [
111 #ifndef __NR_futex
112 #error "futexes not available"
113 #endif
114 ],
115 [
116 AC_MSG_RESULT([yes])
117 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
118 compat_futex_test=0
119 ]
120 ,
121 [
122 AC_MSG_RESULT([no])
123 compat_futex_test=1
124 ]
125 )
126
127 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
128
129 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
130
131 [
132 if test "x$SUBARCHTYPE" = xx86compat; then
133 ]
134 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
135 [
136 fi
137 ]
138
139 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
140 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
141
142 [
143 if test "$def_smp_support" = "no"; then
144 echo "SMP support disabled."
145 else
146 ]
147 AC_DEFINE([CONFIG_RCU_SMP], [1])
148 [
149 echo "SMP support enabled."
150 fi
151 ]
152
153 # From the sched_setaffinity(2)'s man page:
154 # ~~~~
155 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
156 # The library interfaces were introduced in glibc 2.3. Initially, the
157 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
158 # the cpuset size argument was removed, but this argument was
159 # restored in glibc 2.3.4.
160 # ~~~~
161
162 # In addition to that, some vendors ported the system call to 2.4
163 # kernels.
164
165 # Furthermore, when the function first appeared, the MASK argument was
166 # an unsigned long pointer, while later it was made into a cpu_set_t
167 # pointer. Systems that have the cpu_set_t version also should have
168 # the CPU_ZERO, CPU_SET, etc. macros.
169
170 # All this mess means we have to cater for at least 3 different
171 # sched_setaffinity prototypes:
172
173 # ~~~~
174 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
175 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
176 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
177 # ~~~~
178
179 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
180 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
181 dnl sched_setaffinity bits differently.
182 saved_CFLAGS=$CFLAGS
183 CFLAGS="$CFLAGS -D_GNU_SOURCE"
184
185 # First check if the function is available at all.
186 AC_CHECK_FUNCS(
187 [sched_setaffinity],
188 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
189 # then we have the first version using unsigned long, and no
190 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
191 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
192 # should also be present, but we confirm nonetheless.
193
194 AC_CHECK_TYPES(
195 [cpu_set_t],
196 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
197 AC_MSG_CHECKING([whether CPU_ZERO works])
198 AH_TEMPLATE([HAVE_CPU_ZERO],
199 [Define to 1 if we have CPU_ZERO and if it works])
200 AC_COMPILE_IFELSE(
201 [AC_LANG_PROGRAM(
202 [#define _GNU_SOURCE
203 #include <sched.h>],
204 [cpu_set_t foo; CPU_ZERO (&foo);])
205 ],
206 [ # Works!
207 AC_DEFINE(HAVE_CPU_ZERO, 1)
208 AC_MSG_RESULT([yes])
209 ],
210 [AC_MSG_RESULT([no])]
211 )
212
213 # Check how many arguments does sched_setaffinity take.
214 # Should be 3 or 2.
215 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
216 AC_COMPILE_IFELSE(
217 [AC_LANG_PROGRAM(
218 [#include <sched.h>],
219 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
220 ],
221 [sched_set_affinity_args=3],
222 [sched_set_affinity_args=2])
223 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
224 [Define to sched_setaffinity's number of arguments.])
225 AC_MSG_RESULT([$sched_set_affinity_args])
226 ],
227 [ # No cpu_set_t, always 3 args.
228 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
229 [#include <sched.h>]
230 )
231 ]
232 )
233
234 CFLAGS=$saved_CFLAGS
235
236 AC_CONFIG_LINKS([
237 urcu/arch.h:$ARCHSRC
238 urcu/uatomic_arch.h:$UATOMICSRC
239 tests/api.h:$APISRC
240 ])
241 AC_CONFIG_FILES([
242 Makefile
243 tests/Makefile
244 liburcu.pc
245 liburcu-bp.pc
246 liburcu-qsbr.pc
247 liburcu-mb.pc
248 liburcu-signal.pc
249 ])
250 AC_OUTPUT
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