Headers: move arch_*.h to urcu/arch/*.h
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
6cf6f5f8 5AC_INIT([userspace-rcu], [0.5.4], [mathieu dot desnoyers at efficios dot com])
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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
9AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0])
10
48d848c7 11AC_CONFIG_AUX_DIR([config])
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12AC_CANONICAL_TARGET
13AC_CANONICAL_HOST
48d848c7 14AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
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15m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
16
48d848c7 17AC_CONFIG_SRCDIR([urcu.h])
0f4ac97f 18AM_PROG_MKDIR_P
7d413817 19
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20AC_CONFIG_HEADERS([config.h urcu/config.h])
21
22# Keep at the end to do not pollute installed header.
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23AH_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.])
24AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
25AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
26AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
bf9de1b7 27cmpxchg instruction.])
e95ee429 28AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
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29
30# Checks for programs.
31AC_PROG_CC
32AC_PROG_MAKE_SET
33AC_PROG_LIBTOOL
34
35# Checks for typedefs, structures, and compiler characteristics.
36AC_C_INLINE
37AC_TYPE_PID_T
38AC_TYPE_SIZE_T
39
40# Checks for library functions.
41AC_FUNC_MALLOC
42AC_FUNC_MMAP
b57aee66 43AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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44
45# Find arch type
c5b9f8ff 46case $host_cpu in
7d413817 47 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
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48 i486) ARCHTYPE="x86";;
49 i586) ARCHTYPE="x86";;
50 i686) ARCHTYPE="x86";;
48d848c7 51 x86_64) ARCHTYPE="x86";;
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52 powerpc) ARCHTYPE="ppc" ;;
53 ppc64) ARCHTYPE="ppc" ;;
7d413817 54 powerpc64) ARCHTYPE="ppc" ;;
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55 ppc) ARCHTYPE="ppc" ;;
56 s390) ARCHTYPE="s390" ;;
57 s390x) ARCHTYPE="s390" ;;
c0a68bfa 58 sparc64) ARCHTYPE="sparc64" ;;
6f9d9b49 59 alpha*) ARCHTYPE="alpha" ;;
ca5a03db 60 ia64) ARCHTYPE="gcc" ;;
93af08d9 61 arm*) ARCHTYPE="arm" ;;
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62 *) ARCHTYPE="unknown";;
63esac
64
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65if test "x$ARCHTYPE" = "xarm" ; then
66AC_MSG_CHECKING([checking for dmb instruction])
67AC_TRY_COMPILE(
68[
69],
70[
71asm volatile("dmb":::"memory");
72],
73[
74 AC_MSG_RESULT([yes])
e95ee429 75 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
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76]
77,
78[
79 AC_MSG_RESULT([no])
80]
81)
82fi
83
c53cf27f 84UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
1b9119f8 85ARCHSRC=urcu/arch/$ARCHTYPE.h
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86if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
87 APISRC=tests/api_gcc.h
88else
89 APISRC=tests/api_$ARCHTYPE.h
90fi
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91if test "$ARCHTYPE" == "armv7l"; then
92 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
93fi
455b809a 94
48d848c7 95AC_SUBST(ARCHTYPE)
7d413817 96AC_SUBST(SUBARCHTYPE)
48d848c7 97
90586875 98[
c5b9f8ff 99#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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100#For now, using lock; addl compatibility mode even for i686, because the
101#Pentium III is seen as a i686, but lacks mfence instruction.
102#Only using fence for x86_64.
c5b9f8ff 103if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
90586875 104]
02be5561 105 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
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106[
107fi
108]
109
49617de1 110AC_MSG_CHECKING([sys_futex()])
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111AC_TRY_COMPILE(
112[
113#include <sys/syscall.h>
114],
115[
116#ifndef __NR_futex
117#error "futexes not available"
118#endif
119],
120[
121 AC_MSG_RESULT([yes])
02be5561 122 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
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123 compat_futex_test=0
124]
125,
126[
127 AC_MSG_RESULT([no])
128 compat_futex_test=1
129]
130)
131
132AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
133
0854ccff 134AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
7d413817 135
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136[
137if test "x$SUBARCHTYPE" = xx86compat; then
138]
02be5561 139 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
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140[
141fi
142]
143
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144AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
145 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
146
147[
148if test "$def_smp_support" = "no"; then
149 echo "SMP support disabled."
150else
151]
02be5561 152 AC_DEFINE([CONFIG_RCU_SMP], [1])
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153[
154 echo "SMP support enabled."
155fi
156]
48d848c7 157
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158# From the sched_setaffinity(2)'s man page:
159# ~~~~
160# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
161# The library interfaces were introduced in glibc 2.3. Initially, the
162# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
163# the cpuset size argument was removed, but this argument was
164# restored in glibc 2.3.4.
165# ~~~~
166
167# In addition to that, some vendors ported the system call to 2.4
168# kernels.
169
170# Furthermore, when the function first appeared, the MASK argument was
171# an unsigned long pointer, while later it was made into a cpu_set_t
172# pointer. Systems that have the cpu_set_t version also should have
173# the CPU_ZERO, CPU_SET, etc. macros.
174
175# All this mess means we have to cater for at least 3 different
176# sched_setaffinity prototypes:
177
178# ~~~~
179# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
180# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
181# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
182# ~~~~
183
184dnl Since we define _GNU_SOURCE in the sources, must do so too in the
185dnl autoconf tests, as defining _GNU_SOURCE or not exposes
186dnl sched_setaffinity bits differently.
187saved_CFLAGS=$CFLAGS
188CFLAGS="$CFLAGS -D_GNU_SOURCE"
189
190# First check if the function is available at all.
191AC_CHECK_FUNCS(
192 [sched_setaffinity],
193 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
194 # then we have the first version using unsigned long, and no
195 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
196 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
197 # should also be present, but we confirm nonetheless.
198
199 AC_CHECK_TYPES(
200 [cpu_set_t],
201 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
202 AC_MSG_CHECKING([whether CPU_ZERO works])
203 AH_TEMPLATE([HAVE_CPU_ZERO],
204 [Define to 1 if we have CPU_ZERO and if it works])
205 AC_COMPILE_IFELSE(
206 [AC_LANG_PROGRAM(
207 [#define _GNU_SOURCE
208 #include <sched.h>],
209 [cpu_set_t foo; CPU_ZERO (&foo);])
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(
222 [AC_LANG_PROGRAM(
223 [#include <sched.h>],
224 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
225 ],
226 [sched_set_affinity_args=3],
227 [sched_set_affinity_args=2])
228 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
229 [Define to sched_setaffinity's number of arguments.])
230 AC_MSG_RESULT([$sched_set_affinity_args])
231 ],
232 [ # No cpu_set_t, always 3 args.
233 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
234 [#include <sched.h>]
235 )
236 ]
237)
238
239CFLAGS=$saved_CFLAGS
240
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241AC_CONFIG_LINKS([
242 urcu/arch.h:$ARCHSRC
243 urcu/uatomic_arch.h:$UATOMICSRC
244 tests/api.h:$APISRC
245])
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246AC_CONFIG_FILES([
247 Makefile
248 tests/Makefile
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249 liburcu.pc
250 liburcu-bp.pc
251 liburcu-qsbr.pc
252 liburcu-mb.pc
253 liburcu-signal.pc
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254])
255AC_OUTPUT
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