Add header files supporting gcc __sync_ primitives
[urcu.git] / configure.ac
1 # -*- Autoconf -*-
2 # Process this file with autoconf to produce a configure script.
3
4
5 AC_INIT([userspace-rcu], [0.4.4], [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
24 # Checks for programs.
25 AC_PROG_CC
26 AC_PROG_MAKE_SET
27 AC_PROG_LIBTOOL
28
29 # Checks for typedefs, structures, and compiler characteristics.
30 AC_C_INLINE
31 AC_TYPE_PID_T
32 AC_TYPE_SIZE_T
33
34 # Checks for library functions.
35 AC_FUNC_MALLOC
36 AC_FUNC_MMAP
37 AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
38
39 # Find arch type
40 case $host_cpu in
41 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
42 i486) ARCHTYPE="x86";;
43 i586) ARCHTYPE="x86";;
44 i686) ARCHTYPE="x86";;
45 x86_64) ARCHTYPE="x86";;
46 powerpc) ARCHTYPE="ppc" ;;
47 ppc64) ARCHTYPE="ppc" ;;
48 powerpc64) ARCHTYPE="ppc" ;;
49 ppc) ARCHTYPE="ppc" ;;
50 s390) ARCHTYPE="s390" ;;
51 s390x) ARCHTYPE="s390" ;;
52 sparc64) ARCHTYPE="sparc64" ;;
53 alpha*) ARCHTYPE="alpha" ;;
54 *) ARCHTYPE="unknown";;
55 esac
56
57 if test "$ARCHTYPE" != "unknown"; then
58 UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
59 ARCHSRC=urcu/arch_$ARCHTYPE.h
60 else
61 UATOMICSRC=urcu/uatomic_generic.h
62 ARCHSRC=urcu/arch_generic.h
63 fi
64 if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
65 APISRC=tests/api_gcc.h
66 else
67 APISRC=tests/api_$ARCHTYPE.h
68 fi
69
70 AC_SUBST(ARCHTYPE)
71 AC_SUBST(SUBARCHTYPE)
72
73 [
74 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
75 #For now, using lock; addl compatibility mode even for i686, because the
76 #Pentium III is seen as a i686, but lacks mfence instruction.
77 #Only using fence for x86_64.
78 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
79 ]
80 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
81 [
82 fi
83 ]
84
85 AC_MSG_CHECKING([sys_futex()])
86 AC_TRY_COMPILE(
87 [
88 #include <sys/syscall.h>
89 ],
90 [
91 #ifndef __NR_futex
92 #error "futexes not available"
93 #endif
94 ],
95 [
96 AC_MSG_RESULT([yes])
97 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
98 compat_futex_test=0
99 ]
100 ,
101 [
102 AC_MSG_RESULT([no])
103 compat_futex_test=1
104 ]
105 )
106
107 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
108
109 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
110
111 [
112 if test "x$SUBARCHTYPE" = xx86compat; then
113 ]
114 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
115 [
116 fi
117 ]
118
119 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
120 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
121
122 [
123 if test "$def_smp_support" = "no"; then
124 echo "SMP support disabled."
125 else
126 ]
127 AC_DEFINE([CONFIG_RCU_SMP], [1])
128 [
129 echo "SMP support enabled."
130 fi
131 ]
132
133 # From the sched_setaffinity(2)'s man page:
134 # ~~~~
135 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
136 # The library interfaces were introduced in glibc 2.3. Initially, the
137 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
138 # the cpuset size argument was removed, but this argument was
139 # restored in glibc 2.3.4.
140 # ~~~~
141
142 # In addition to that, some vendors ported the system call to 2.4
143 # kernels.
144
145 # Furthermore, when the function first appeared, the MASK argument was
146 # an unsigned long pointer, while later it was made into a cpu_set_t
147 # pointer. Systems that have the cpu_set_t version also should have
148 # the CPU_ZERO, CPU_SET, etc. macros.
149
150 # All this mess means we have to cater for at least 3 different
151 # sched_setaffinity prototypes:
152
153 # ~~~~
154 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
155 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
156 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
157 # ~~~~
158
159 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
160 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
161 dnl sched_setaffinity bits differently.
162 saved_CFLAGS=$CFLAGS
163 CFLAGS="$CFLAGS -D_GNU_SOURCE"
164
165 # First check if the function is available at all.
166 AC_CHECK_FUNCS(
167 [sched_setaffinity],
168 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
169 # then we have the first version using unsigned long, and no
170 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
171 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
172 # should also be present, but we confirm nonetheless.
173
174 AC_CHECK_TYPES(
175 [cpu_set_t],
176 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
177 AC_MSG_CHECKING([whether CPU_ZERO works])
178 AH_TEMPLATE([HAVE_CPU_ZERO],
179 [Define to 1 if we have CPU_ZERO and if it works])
180 AC_COMPILE_IFELSE(
181 [AC_LANG_PROGRAM(
182 [#define _GNU_SOURCE
183 #include <sched.h>],
184 [cpu_set_t foo; CPU_ZERO (&foo);])
185 ],
186 [ # Works!
187 AC_DEFINE(HAVE_CPU_ZERO, 1)
188 AC_MSG_RESULT([yes])
189 ],
190 [AC_MSG_RESULT([no])]
191 )
192
193 # Check how many arguments does sched_setaffinity take.
194 # Should be 3 or 2.
195 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
196 AC_COMPILE_IFELSE(
197 [AC_LANG_PROGRAM(
198 [#include <sched.h>],
199 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
200 ],
201 [sched_set_affinity_args=3],
202 [sched_set_affinity_args=2])
203 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
204 [Define to sched_setaffinity's number of arguments.])
205 AC_MSG_RESULT([$sched_set_affinity_args])
206 ],
207 [ # No cpu_set_t, always 3 args.
208 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
209 [#include <sched.h>]
210 )
211 ]
212 )
213
214 CFLAGS=$saved_CFLAGS
215
216 AC_CONFIG_LINKS([
217 urcu/arch.h:$ARCHSRC
218 urcu/uatomic_arch.h:$UATOMICSRC
219 tests/api.h:$APISRC
220 ])
221 AC_CONFIG_FILES([
222 Makefile
223 tests/Makefile
224 ])
225 AC_OUTPUT
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