version 0.3.4
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
94b7b9d2 5AC_INIT([userspace-rcu], [0.3.4], [mathieu dot desnoyers at polymtl dot ca])
48d848c7 6AC_CONFIG_AUX_DIR([config])
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7AC_CANONICAL_TARGET
8AC_CANONICAL_HOST
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9AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
10AC_CONFIG_SRCDIR([urcu.h])
0f4ac97f 11AM_PROG_MKDIR_P
7d413817 12
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13AC_CONFIG_HEADERS([config.h urcu/config.h])
14
15# Keep at the end to do not pollute installed header.
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16AH_TEMPLATE([CONFIG_URCU_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.])
17AH_TEMPLATE([CONFIG_URCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
18AH_TEMPLATE([CONFIG_URCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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19AH_TEMPLATE([CONFIG_URCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
20cmpxchg instruction.])
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21
22# Checks for programs.
23AC_PROG_CC
24AC_PROG_MAKE_SET
25AC_PROG_LIBTOOL
26
27# Checks for typedefs, structures, and compiler characteristics.
28AC_C_INLINE
29AC_TYPE_PID_T
30AC_TYPE_SIZE_T
31
32# Checks for library functions.
33AC_FUNC_MALLOC
34AC_FUNC_MMAP
35AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
36
37# Find arch type
c5b9f8ff 38case $host_cpu in
7d413817 39 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
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40 i486) ARCHTYPE="x86";;
41 i586) ARCHTYPE="x86";;
42 i686) ARCHTYPE="x86";;
48d848c7 43 x86_64) ARCHTYPE="x86";;
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44 powerpc) ARCHTYPE="ppc" ;;
45 ppc64) ARCHTYPE="ppc" ;;
7d413817 46 powerpc64) ARCHTYPE="ppc" ;;
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47 ppc) ARCHTYPE="ppc" ;;
48 s390) ARCHTYPE="s390" ;;
49 s390x) ARCHTYPE="s390" ;;
c0a68bfa 50 sparc64) ARCHTYPE="sparc64" ;;
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51 *) ARCHTYPE="unknown";;
52esac
53
54if test "$ARCHTYPE" = "unknown"; then
55 AC_MSG_ERROR([Unable to detect the architecture.])
56fi
57AC_SUBST(ARCHTYPE)
7d413817 58AC_SUBST(SUBARCHTYPE)
48d848c7 59
90586875 60[
c5b9f8ff 61#if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
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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.
c5b9f8ff 65if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
90586875 66]
49617de1 67 AC_DEFINE([CONFIG_URCU_HAVE_FENCE], [1])
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68[
69fi
70]
71
49617de1 72AC_MSG_CHECKING([sys_futex()])
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73AC_TRY_COMPILE(
74[
75#include <sys/syscall.h>
76],
77[
78#ifndef __NR_futex
79#error "futexes not available"
80#endif
81],
82[
83 AC_MSG_RESULT([yes])
49617de1 84 AC_DEFINE([CONFIG_URCU_HAVE_FUTEX], [1])
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85 compat_futex_test=0
86]
87,
88[
89 AC_MSG_RESULT([no])
90 compat_futex_test=1
91]
92)
93
94AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
95
40646e1e 96AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
48d848c7 97
0854ccff 98AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
7d413817 99
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100[
101if test "x$SUBARCHTYPE" = xx86compat; then
102]
103 AC_DEFINE([CONFIG_URCU_COMPAT_ARCH], [1])
104[
105fi
106]
107
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108AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
109 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
110
111[
112if test "$def_smp_support" = "no"; then
113 echo "SMP support disabled."
114else
115]
49617de1 116 AC_DEFINE([CONFIG_URCU_SMP], [1])
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117[
118 echo "SMP support enabled."
119fi
120]
48d848c7 121
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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
148dnl Since we define _GNU_SOURCE in the sources, must do so too in the
149dnl autoconf tests, as defining _GNU_SOURCE or not exposes
150dnl sched_setaffinity bits differently.
151saved_CFLAGS=$CFLAGS
152CFLAGS="$CFLAGS -D_GNU_SOURCE"
153
154# First check if the function is available at all.
155AC_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
203CFLAGS=$saved_CFLAGS
204
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205AC_CONFIG_FILES([
206 Makefile
207 tests/Makefile
208])
209AC_OUTPUT
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