use kernel style makefile output
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
e0b9d030 5AC_INIT([userspace-rcu], [0.4.1], [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 $host_cpu in
7d413817 41 i386) ARCHTYPE="x86"; SUBARCHTYPE="x86compat" ;;
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42 i486) ARCHTYPE="x86";;
43 i586) ARCHTYPE="x86";;
44 i686) ARCHTYPE="x86";;
48d848c7 45 x86_64) ARCHTYPE="x86";;
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46 powerpc) ARCHTYPE="ppc" ;;
47 ppc64) ARCHTYPE="ppc" ;;
7d413817 48 powerpc64) ARCHTYPE="ppc" ;;
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49 ppc) ARCHTYPE="ppc" ;;
50 s390) ARCHTYPE="s390" ;;
51 s390x) ARCHTYPE="s390" ;;
c0a68bfa 52 sparc64) ARCHTYPE="sparc64" ;;
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53 *) ARCHTYPE="unknown";;
54esac
55
56if test "$ARCHTYPE" = "unknown"; then
57 AC_MSG_ERROR([Unable to detect the architecture.])
58fi
59AC_SUBST(ARCHTYPE)
7d413817 60AC_SUBST(SUBARCHTYPE)
48d848c7 61
90586875 62[
c5b9f8ff 63#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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64#For now, using lock; addl compatibility mode even for i686, because the
65#Pentium III is seen as a i686, but lacks mfence instruction.
66#Only using fence for x86_64.
c5b9f8ff 67if test "x$ARCHTYPE" = "xx86" -a "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"; then
90586875 68]
02be5561 69 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
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70[
71fi
72]
73
49617de1 74AC_MSG_CHECKING([sys_futex()])
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75AC_TRY_COMPILE(
76[
77#include <sys/syscall.h>
78],
79[
80#ifndef __NR_futex
81#error "futexes not available"
82#endif
83],
84[
85 AC_MSG_RESULT([yes])
02be5561 86 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
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87 compat_futex_test=0
88]
89,
90[
91 AC_MSG_RESULT([no])
92 compat_futex_test=1
93]
94)
95
96AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
97
40646e1e 98AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
48d848c7 99
0854ccff 100AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
7d413817 101
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102[
103if test "x$SUBARCHTYPE" = xx86compat; then
104]
02be5561 105 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
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106[
107fi
108]
109
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110AC_ARG_ENABLE([smp-support], [ --disable-smp-support Disable SMP support. Warning: only use this
111 on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
112
113[
114if test "$def_smp_support" = "no"; then
115 echo "SMP support disabled."
116else
117]
02be5561 118 AC_DEFINE([CONFIG_RCU_SMP], [1])
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119[
120 echo "SMP support enabled."
121fi
122]
48d848c7 123
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124# From the sched_setaffinity(2)'s man page:
125# ~~~~
126# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
127# The library interfaces were introduced in glibc 2.3. Initially, the
128# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
129# the cpuset size argument was removed, but this argument was
130# restored in glibc 2.3.4.
131# ~~~~
132
133# In addition to that, some vendors ported the system call to 2.4
134# kernels.
135
136# Furthermore, when the function first appeared, the MASK argument was
137# an unsigned long pointer, while later it was made into a cpu_set_t
138# pointer. Systems that have the cpu_set_t version also should have
139# the CPU_ZERO, CPU_SET, etc. macros.
140
141# All this mess means we have to cater for at least 3 different
142# sched_setaffinity prototypes:
143
144# ~~~~
145# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
146# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
147# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
148# ~~~~
149
150dnl Since we define _GNU_SOURCE in the sources, must do so too in the
151dnl autoconf tests, as defining _GNU_SOURCE or not exposes
152dnl sched_setaffinity bits differently.
153saved_CFLAGS=$CFLAGS
154CFLAGS="$CFLAGS -D_GNU_SOURCE"
155
156# First check if the function is available at all.
157AC_CHECK_FUNCS(
158 [sched_setaffinity],
159 [ # Okay, we have it. Check if also have cpu_set_t. If we don't,
160 # then we have the first version using unsigned long, and no
161 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
162 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
163 # should also be present, but we confirm nonetheless.
164
165 AC_CHECK_TYPES(
166 [cpu_set_t],
167 [ # We do have it. Confirm that we have CPU_ZERO, and it actually works.
168 AC_MSG_CHECKING([whether CPU_ZERO works])
169 AH_TEMPLATE([HAVE_CPU_ZERO],
170 [Define to 1 if we have CPU_ZERO and if it works])
171 AC_COMPILE_IFELSE(
172 [AC_LANG_PROGRAM(
173 [#define _GNU_SOURCE
174 #include <sched.h>],
175 [cpu_set_t foo; CPU_ZERO (&foo);])
176 ],
177 [ # Works!
178 AC_DEFINE(HAVE_CPU_ZERO, 1)
179 AC_MSG_RESULT([yes])
180 ],
181 [AC_MSG_RESULT([no])]
182 )
183
184 # Check how many arguments does sched_setaffinity take.
185 # Should be 3 or 2.
186 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
187 AC_COMPILE_IFELSE(
188 [AC_LANG_PROGRAM(
189 [#include <sched.h>],
190 [cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo);])
191 ],
192 [sched_set_affinity_args=3],
193 [sched_set_affinity_args=2])
194 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
195 [Define to sched_setaffinity's number of arguments.])
196 AC_MSG_RESULT([$sched_set_affinity_args])
197 ],
198 [ # No cpu_set_t, always 3 args.
199 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ],
200 [#include <sched.h>]
201 )
202 ]
203)
204
205CFLAGS=$saved_CFLAGS
206
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207AC_CONFIG_FILES([
208 Makefile
209 tests/Makefile
210])
211AC_OUTPUT
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