userspace-rcu tests: zero array before using
[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])
48d848c7 6AC_CONFIG_AUX_DIR([config])
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7AC_CANONICAL_TARGET
8AC_CANONICAL_HOST
48d848c7 9AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
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10m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
11
48d848c7 12AC_CONFIG_SRCDIR([urcu.h])
0f4ac97f 13AM_PROG_MKDIR_P
7d413817 14
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15AC_CONFIG_HEADERS([config.h urcu/config.h])
16
17# Keep at the end to do not pollute installed header.
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18AH_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.])
19AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
20AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
21AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks
bf9de1b7 22cmpxchg instruction.])
e95ee429 23AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction is available for use on ARM.])
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24
25# Checks for programs.
26AC_PROG_CC
27AC_PROG_MAKE_SET
28AC_PROG_LIBTOOL
29
30# Checks for typedefs, structures, and compiler characteristics.
31AC_C_INLINE
32AC_TYPE_PID_T
33AC_TYPE_SIZE_T
34
35# Checks for library functions.
36AC_FUNC_MALLOC
37AC_FUNC_MMAP
b57aee66 38AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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39
40# Find arch type
c5b9f8ff 41case $host_cpu in
7d413817 42 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
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43 i486) ARCHTYPE="x86";;
44 i586) ARCHTYPE="x86";;
45 i686) ARCHTYPE="x86";;
48d848c7 46 x86_64) ARCHTYPE="x86";;
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47 powerpc) ARCHTYPE="ppc" ;;
48 ppc64) ARCHTYPE="ppc" ;;
7d413817 49 powerpc64) ARCHTYPE="ppc" ;;
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50 ppc) ARCHTYPE="ppc" ;;
51 s390) ARCHTYPE="s390" ;;
52 s390x) ARCHTYPE="s390" ;;
c0a68bfa 53 sparc64) ARCHTYPE="sparc64" ;;
6f9d9b49 54 alpha*) ARCHTYPE="alpha" ;;
ca5a03db 55 ia64) ARCHTYPE="gcc" ;;
93af08d9 56 arm*) ARCHTYPE="arm" ;;
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57 *) ARCHTYPE="unknown";;
58esac
59
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60if test "x$ARCHTYPE" = "xarm" ; then
61AC_MSG_CHECKING([checking for dmb instruction])
62AC_TRY_COMPILE(
63[
64],
65[
66asm volatile("dmb":::"memory");
67],
68[
69 AC_MSG_RESULT([yes])
e95ee429 70 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
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71]
72,
73[
74 AC_MSG_RESULT([no])
75]
76)
77fi
78
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79UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
80ARCHSRC=urcu/arch_$ARCHTYPE.h
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81if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
82 APISRC=tests/api_gcc.h
83else
84 APISRC=tests/api_$ARCHTYPE.h
85fi
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86if test "$ARCHTYPE" == "armv7l"; then
87 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
88fi
455b809a 89
48d848c7 90AC_SUBST(ARCHTYPE)
7d413817 91AC_SUBST(SUBARCHTYPE)
48d848c7 92
90586875 93[
c5b9f8ff 94#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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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.
c5b9f8ff 98if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
90586875 99]
02be5561 100 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
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101[
102fi
103]
104
49617de1 105AC_MSG_CHECKING([sys_futex()])
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106AC_TRY_COMPILE(
107[
108#include <sys/syscall.h>
109],
110[
111#ifndef __NR_futex
112#error "futexes not available"
113#endif
114],
115[
116 AC_MSG_RESULT([yes])
02be5561 117 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
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118 compat_futex_test=0
119]
120,
121[
122 AC_MSG_RESULT([no])
123 compat_futex_test=1
124]
125)
126
127AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
128
0854ccff 129AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
7d413817 130
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131[
132if test "x$SUBARCHTYPE" = xx86compat; then
133]
02be5561 134 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
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135[
136fi
137]
138
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139AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
140 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
141
142[
143if test "$def_smp_support" = "no"; then
144 echo "SMP support disabled."
145else
146]
02be5561 147 AC_DEFINE([CONFIG_RCU_SMP], [1])
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148[
149 echo "SMP support enabled."
150fi
151]
48d848c7 152
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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
179dnl Since we define _GNU_SOURCE in the sources, must do so too in the
180dnl autoconf tests, as defining _GNU_SOURCE or not exposes
181dnl sched_setaffinity bits differently.
182saved_CFLAGS=$CFLAGS
183CFLAGS="$CFLAGS -D_GNU_SOURCE"
184
185# First check if the function is available at all.
186AC_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
234CFLAGS=$saved_CFLAGS
235
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236AC_CONFIG_LINKS([
237 urcu/arch.h:$ARCHSRC
238 urcu/uatomic_arch.h:$UATOMICSRC
239 tests/api.h:$APISRC
240])
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241AC_CONFIG_FILES([
242 Makefile
243 tests/Makefile
244])
245AC_OUTPUT
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