hange the arm headers to remove all the references to v7
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
aca06872 5AC_INIT([userspace-rcu], [0.5.2], [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.])
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23
24# Checks for programs.
25AC_PROG_CC
26AC_PROG_MAKE_SET
27AC_PROG_LIBTOOL
28
29# Checks for typedefs, structures, and compiler characteristics.
30AC_C_INLINE
31AC_TYPE_PID_T
32AC_TYPE_SIZE_T
33
34# Checks for library functions.
35AC_FUNC_MALLOC
36AC_FUNC_MMAP
37AC_CHECK_FUNCS([bzero gettimeofday munmap strtoul])
38
39# Find arch type
c5b9f8ff 40case $host_cpu in
7d413817 41 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
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42 i486) ARCHTYPE="x86";;
43 i586) ARCHTYPE="x86";;
44 i686) ARCHTYPE="x86";;
48d848c7 45 x86_64) ARCHTYPE="x86";;
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46 powerpc) ARCHTYPE="ppc" ;;
47 ppc64) ARCHTYPE="ppc" ;;
7d413817 48 powerpc64) ARCHTYPE="ppc" ;;
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49 ppc) ARCHTYPE="ppc" ;;
50 s390) ARCHTYPE="s390" ;;
51 s390x) ARCHTYPE="s390" ;;
c0a68bfa 52 sparc64) ARCHTYPE="sparc64" ;;
6f9d9b49 53 alpha*) ARCHTYPE="alpha" ;;
ca5a03db 54 ia64) ARCHTYPE="gcc" ;;
93af08d9 55 arm*) ARCHTYPE="arm" ;;
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56 *) ARCHTYPE="unknown";;
57esac
58
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59UATOMICSRC=urcu/uatomic_arch_$ARCHTYPE.h
60ARCHSRC=urcu/arch_$ARCHTYPE.h
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61if test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc; then
62 APISRC=tests/api_gcc.h
63else
64 APISRC=tests/api_$ARCHTYPE.h
65fi
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66if test "$ARCHTYPE" == "armv7l"; then
67 CFLAGS="-mcpu=cortex-a9 -mtune=cortex-a9 -O"
68fi
455b809a 69
48d848c7 70AC_SUBST(ARCHTYPE)
7d413817 71AC_SUBST(SUBARCHTYPE)
48d848c7 72
90586875 73[
c5b9f8ff 74#if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586"; then
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75#For now, using lock; addl compatibility mode even for i686, because the
76#Pentium III is seen as a i686, but lacks mfence instruction.
77#Only using fence for x86_64.
c5b9f8ff 78if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
90586875 79]
02be5561 80 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
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81[
82fi
83]
84
49617de1 85AC_MSG_CHECKING([sys_futex()])
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86AC_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])
02be5561 97 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
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98 compat_futex_test=0
99]
100,
101[
102 AC_MSG_RESULT([no])
103 compat_futex_test=1
104]
105)
106
107AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
108
0854ccff 109AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
7d413817 110
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111[
112if test "x$SUBARCHTYPE" = xx86compat; then
113]
02be5561 114 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
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115[
116fi
117]
118
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119AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
120 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
121
122[
123if test "$def_smp_support" = "no"; then
124 echo "SMP support disabled."
125else
126]
02be5561 127 AC_DEFINE([CONFIG_RCU_SMP], [1])
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128[
129 echo "SMP support enabled."
130fi
131]
48d848c7 132
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133# From the sched_setaffinity(2)'s man page:
134# ~~~~
135# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
136# The library interfaces were introduced in glibc 2.3. Initially, the
137# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
138# the cpuset size argument was removed, but this argument was
139# restored in glibc 2.3.4.
140# ~~~~
141
142# In addition to that, some vendors ported the system call to 2.4
143# kernels.
144
145# Furthermore, when the function first appeared, the MASK argument was
146# an unsigned long pointer, while later it was made into a cpu_set_t
147# pointer. Systems that have the cpu_set_t version also should have
148# the CPU_ZERO, CPU_SET, etc. macros.
149
150# All this mess means we have to cater for at least 3 different
151# sched_setaffinity prototypes:
152
153# ~~~~
154# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
155# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
156# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
157# ~~~~
158
159dnl Since we define _GNU_SOURCE in the sources, must do so too in the
160dnl autoconf tests, as defining _GNU_SOURCE or not exposes
161dnl sched_setaffinity bits differently.
162saved_CFLAGS=$CFLAGS
163CFLAGS="$CFLAGS -D_GNU_SOURCE"
164
165# First check if the function is available at all.
166AC_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
214CFLAGS=$saved_CFLAGS
215
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216AC_CONFIG_LINKS([
217 urcu/arch.h:$ARCHSRC
218 urcu/uatomic_arch.h:$UATOMICSRC
219 tests/api.h:$APISRC
220])
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221AC_CONFIG_FILES([
222 Makefile
223 tests/Makefile
224])
225AC_OUTPUT
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