Fix autoconf futex check
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
c2f15ecd 5AC_INIT([userspace-rcu],[0.6.7],[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])
a6412536 12AC_CONFIG_MACRO_DIR([config])
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13AC_CANONICAL_TARGET
14AC_CANONICAL_HOST
48d848c7 15AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
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16m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
17
48d848c7 18AC_CONFIG_SRCDIR([urcu.h])
7d413817 19
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20AC_CONFIG_HEADERS([config.h urcu/config.h])
21
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22AH_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.])
23AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
24AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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25AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
26AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
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27
28# Checks for programs.
29AC_PROG_CC
30AC_PROG_MAKE_SET
b14a378a 31LT_INIT
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32
33# Checks for typedefs, structures, and compiler characteristics.
34AC_C_INLINE
35AC_TYPE_PID_T
36AC_TYPE_SIZE_T
37
38# Checks for library functions.
39AC_FUNC_MALLOC
40AC_FUNC_MMAP
b57aee66 41AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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42
43# Find arch type
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44AS_CASE([$host_cpu],
45 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
46 [i486], [ARCHTYPE="x86"],
47 [i586], [ARCHTYPE="x86"],
48 [i686], [ARCHTYPE="x86"],
49 [amd64], [ARCHTYPE="x86"],
50 [x86_64], [ARCHTYPE="x86"],
51 [powerpc], [ARCHTYPE="ppc"],
52 [ppc64], [ARCHTYPE="ppc"],
53 [powerpc64], [ARCHTYPE="ppc"],
54 [ppc], [ARCHTYPE="ppc"],
55 [s390], [ARCHTYPE="s390"],
56 [s390x], [ARCHTYPE="s390"],
57 [sparc64], [ARCHTYPE="sparc64"],
58 [alpha*], [ARCHTYPE="alpha"],
59 [ia64], [ARCHTYPE="gcc"],
60 [arm*], [ARCHTYPE="arm"],
61 [ARCHTYPE="unknown"]
62)
91b0650a 63
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64AC_SUBST(ARCHTYPE)
65AC_SUBST(SUBARCHTYPE)
5e626e0e 66
a2e7bf9c 67UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 68ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 69
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70AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
71 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
72])
73
74AS_IF([test "$host_cpu" = "armv7l"],[
75 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
76])
48d848c7 77
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78# ARM-specific checks
79AS_IF([test "x$ARCHTYPE" = "xarm"],[
80 AC_MSG_CHECKING([for dmb instruction])
ec5e2d14 81 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[]], [[asm volatile("dmb":::"memory");]])],[
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82 AC_MSG_RESULT([yes])
83 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
84 ],[
85 AC_MSG_RESULT([no])
86 ])
87])
88
89# x86-specific checks
90AS_IF([test "x$ARCHTYPE" = "xx86"],[
91 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
92 #For now, using lock; addl compatibility mode even for i686, because the
93 #Pentium III is seen as a i686, but lacks mfence instruction.
94 #Only using fence for x86_64.
95 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
96 AC_MSG_RESULT([yes])
97 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
98 ],[
99 AC_MSG_RESULT([no])
100 ])
101])
102
103# Check if sys_futex() is available
104AC_MSG_CHECKING([for sys_futex()])
657e7f89 105AC_COMPILE_IFELSE([AC_LANG_SOURCE([
a6412536 106 #include <sys/syscall.h>
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107 #ifndef __NR_futex
108 #error "futexes not available"
109 #endif
657e7f89 110 ])
a6412536 111],[
0854ccff 112 AC_MSG_RESULT([yes])
02be5561 113 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 114 compat_futex_test=0
91b0650a 115],[
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116 AC_MSG_RESULT([no])
117 compat_futex_test=1
91b0650a 118])
0854ccff 119
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120AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
121AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
0854ccff 122
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123# smp-support configure option
124AC_ARG_ENABLE([smp-support],
125 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
126 [def_smp_support=$enableval],
127 [def_smp_support="yes"])
128AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 129
48d848c7 130
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131# From the sched_setaffinity(2)'s man page:
132# ~~~~
133# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
134# The library interfaces were introduced in glibc 2.3. Initially, the
135# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
136# the cpuset size argument was removed, but this argument was
137# restored in glibc 2.3.4.
138# ~~~~
139
140# In addition to that, some vendors ported the system call to 2.4
141# kernels.
142
143# Furthermore, when the function first appeared, the MASK argument was
144# an unsigned long pointer, while later it was made into a cpu_set_t
145# pointer. Systems that have the cpu_set_t version also should have
146# the CPU_ZERO, CPU_SET, etc. macros.
147
148# All this mess means we have to cater for at least 3 different
149# sched_setaffinity prototypes:
150
151# ~~~~
152# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
153# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
154# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
155# ~~~~
156
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157# Since we define _GNU_SOURCE in the sources, must do so too in the
158# autoconf tests, as defining _GNU_SOURCE or not exposes
159# sched_setaffinity bits differently.
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160saved_CFLAGS=$CFLAGS
161CFLAGS="$CFLAGS -D_GNU_SOURCE"
162
163# First check if the function is available at all.
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164AC_CHECK_FUNCS([sched_setaffinity],[
165 # Okay, we have it. Check if also have cpu_set_t. If we don't,
166 # then we have the first version using unsigned long, and no
167 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
168 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
169 # should also be present, but we confirm nonetheless.
170
171 AC_CHECK_TYPES([cpu_set_t],[
172 # We do have it. Confirm that we have CPU_ZERO, and it actually works.
173 AC_MSG_CHECKING([whether CPU_ZERO works])
174 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
ec5e2d14 175 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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176 #define _GNU_SOURCE
177 #include <sched.h>
178 ]],[[
179 cpu_set_t foo; CPU_ZERO (&foo);
180 ]])
181 ],[
182 # Works!
183 AC_DEFINE(HAVE_CPU_ZERO, 1)
184 AC_MSG_RESULT([yes])
185 ],[
186 AC_MSG_RESULT([no])
187 ])
188
189 # Check how many arguments does sched_setaffinity take.
190 # Should be 3 or 2.
191 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 192 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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193 #include <sched.h>
194 ]],[[
195 cpu_set_t foo;
196 sched_setaffinity (0, sizeof (foo), &foo);
197 ]])
198 ],
199 [sched_set_affinity_args=3],
200 [sched_set_affinity_args=2])
201 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
202 [Defined to sched_setaffinity's number of arguments.])
203 AC_MSG_RESULT([$sched_set_affinity_args])
204 ],[
205 # No cpu_set_t, always 3 args.
206 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
207 ],
208 [#include <sched.h>])
209])
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210
211CFLAGS=$saved_CFLAGS
212
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213AC_CONFIG_LINKS([
214 urcu/arch.h:$ARCHSRC
a2e7bf9c 215 urcu/uatomic.h:$UATOMICSRC
455b809a 216])
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217AC_CONFIG_FILES([
218 Makefile
219 tests/Makefile
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220 liburcu.pc
221 liburcu-bp.pc
a6412536 222 liburcu-cds.pc
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223 liburcu-qsbr.pc
224 liburcu-mb.pc
225 liburcu-signal.pc
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226])
227AC_OUTPUT
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228
229# Report on selected configure options
230AS_IF([test "x$def_smp_support" = "xyes"],[
231 AS_ECHO("SMP support enabled.")
232],[
233 AS_ECHO("SMP support disabled.")
234])
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