urcu: use unsigned long instead of long
[urcu.git] / configure.ac
1 # -*- Autoconf -*-
2 # Process this file with autoconf to produce a configure script.
3
4
5 AC_INIT([userspace-rcu], [0.4.0], [mathieu dot desnoyers at polymtl dot ca])
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 AC_CONFIG_SRCDIR([urcu.h])
11 AM_PROG_MKDIR_P
12
13 AC_CONFIG_HEADERS([config.h urcu/config.h])
14
15 # Keep at the end to do not pollute installed header.
16 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.])
17 AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
18 AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
19 AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
20 cmpxchg instruction.])
21
22 # Checks for programs.
23 AC_PROG_CC
24 AC_PROG_MAKE_SET
25 AC_PROG_LIBTOOL
26
27 # Checks for typedefs, structures, and compiler characteristics.
28 AC_C_INLINE
29 AC_TYPE_PID_T
30 AC_TYPE_SIZE_T
31
32 # Checks for library functions.
33 AC_FUNC_MALLOC
34 AC_FUNC_MMAP
35 AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
36
37 # Find arch type
38 case $host_cpu in
39 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
40 i486) ARCHTYPE="x86";;
41 i586) ARCHTYPE="x86";;
42 i686) ARCHTYPE="x86";;
43 x86_64) ARCHTYPE="x86";;
44 powerpc) ARCHTYPE="ppc" ;;
45 ppc64) ARCHTYPE="ppc" ;;
46 powerpc64) ARCHTYPE="ppc" ;;
47 ppc) ARCHTYPE="ppc" ;;
48 s390) ARCHTYPE="s390" ;;
49 s390x) ARCHTYPE="s390" ;;
50 sparc64) ARCHTYPE="sparc64" ;;
51 *) ARCHTYPE="unknown";;
52 esac
53
54 if test "$ARCHTYPE" = "unknown"; then
55 AC_MSG_ERROR([Unable to detect the architecture.])
56 fi
57 AC_SUBST(ARCHTYPE)
58 AC_SUBST(SUBARCHTYPE)
59
60 [
61 #if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
62 #For now, using lock; addl compatibility mode even for i686, because the
63 #Pentium III is seen as a i686, but lacks mfence instruction.
64 #Only using fence for x86_64.
65 if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
66 ]
67 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
68 [
69 fi
70 ]
71
72 AC_MSG_CHECKING([sys_futex()])
73 AC_TRY_COMPILE(
74 [
75 #include <sys/syscall.h>
76 ],
77 [
78 #ifndef __NR_futex
79 #error "futexes not available"
80 #endif
81 ],
82 [
83 AC_MSG_RESULT([yes])
84 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
85 compat_futex_test=0
86 ]
87 ,
88 [
89 AC_MSG_RESULT([no])
90 compat_futex_test=1
91 ]
92 )
93
94 AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
95
96 AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
97
98 AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
99
100 [
101 if test "x$SUBARCHTYPE" = xx86compat; then
102 ]
103 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
104 [
105 fi
106 ]
107
108 AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
109 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
110
111 [
112 if test "$def_smp_support" = "no"; then
113 echo "SMP support disabled."
114 else
115 ]
116 AC_DEFINE([CONFIG_RCU_SMP], [1])
117 [
118 echo "SMP support enabled."
119 fi
120 ]
121
122 # From the sched_setaffinity(2)'s man page:
123 # ~~~~
124 # The CPU affinity system calls were introduced in Linux kernel 2.5.8.
125 # The library interfaces were introduced in glibc 2.3. Initially, the
126 # glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
127 # the cpuset size argument was removed, but this argument was
128 # restored in glibc 2.3.4.
129 # ~~~~
130
131 # In addition to that, some vendors ported the system call to 2.4
132 # kernels.
133
134 # Furthermore, when the function first appeared, the MASK argument was
135 # an unsigned long pointer, while later it was made into a cpu_set_t
136 # pointer. Systems that have the cpu_set_t version also should have
137 # the CPU_ZERO, CPU_SET, etc. macros.
138
139 # All this mess means we have to cater for at least 3 different
140 # sched_setaffinity prototypes:
141
142 # ~~~~
143 # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
144 # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
145 # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
146 # ~~~~
147
148 dnl Since we define _GNU_SOURCE in the sources, must do so too in the
149 dnl autoconf tests, as defining _GNU_SOURCE or not exposes
150 dnl sched_setaffinity bits differently.
151 saved_CFLAGS=$CFLAGS
152 CFLAGS="$CFLAGS -D_GNU_SOURCE"
153
154 # First check if the function is available at all.
155 AC_CHECK_FUNCS(
156 [sched_setaffinity],
157 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
158 # then we have the first version using unsigned long, and no
159 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
160 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
161 # should also be present, but we confirm nonetheless.
162
163 AC_CHECK_TYPES(
164 [cpu_set_t],
165 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
166 AC_MSG_CHECKING([whether CPU_ZERO works])
167 AH_TEMPLATE([HAVE_CPU_ZERO],
168 [Define to 1 if we have CPU_ZERO and if it works])
169 AC_COMPILE_IFELSE(
170 [AC_LANG_PROGRAM(
171 [#define _GNU_SOURCE
172 #include <sched.h>],
173 [cpu_set_t foo; CPU_ZERO (&foo);])
174 ],
175 [ # Works!
176 AC_DEFINE(HAVE_CPU_ZERO, 1)
177 AC_MSG_RESULT([yes])
178 ],
179 [AC_MSG_RESULT([no])]
180 )
181
182 # Check how many arguments does sched_setaffinity take.
183 # Should be 3 or 2.
184 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
185 AC_COMPILE_IFELSE(
186 [AC_LANG_PROGRAM(
187 [#include <sched.h>],
188 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
189 ],
190 [sched_set_affinity_args=3],
191 [sched_set_affinity_args=2])
192 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
193 [Define to sched_setaffinity's number of arguments.])
194 AC_MSG_RESULT([$sched_set_affinity_args])
195 ],
196 [ # No cpu_set_t, always 3 args.
197 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
198 [#include <sched.h>]
199 )
200 ]
201 )
202
203 CFLAGS=$saved_CFLAGS
204
205 AC_CONFIG_FILES([
206 Makefile
207 tests/Makefile
208 ])
209 AC_OUTPUT
This page took 0.033388 seconds and 4 git commands to generate.