Fix: don't use overlapping mmap mappings on Cygwin
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
2ceb3692 5AC_INIT([userspace-rcu],[0.8.10],[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
74a86b59 9AC_SUBST([URCU_LIBRARY_VERSION], [3:0:1])
98bc124a 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
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18m4_include([config/ax_tls.m4])
19
48d848c7 20AC_CONFIG_SRCDIR([urcu.h])
7d413817 21
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22AC_CONFIG_HEADERS([config.h urcu/config.h])
23
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24AH_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.])
25AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
26AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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27AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
28AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
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29AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
30
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31# Allow overriding storage used for TLS variables.
32AC_ARG_ENABLE([compiler-tls],
33 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
34 [def_compiler_tls=$enableval],
35 [def_compiler_tls="yes"])
36
37# If not overridden, use ax_tls.m4 to check if TLS is available.
38AS_IF([test "x$def_compiler_tls" = "xyes"],
39 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
40 [:])
41
42AS_IF([test "x$def_tls_detect" = "x"],
43 [:],
44 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
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45
46# Checks for programs.
47AC_PROG_CC
48AC_PROG_MAKE_SET
b14a378a 49LT_INIT
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50
51# Checks for typedefs, structures, and compiler characteristics.
52AC_C_INLINE
53AC_TYPE_PID_T
54AC_TYPE_SIZE_T
55
56# Checks for library functions.
48d848c7 57AC_FUNC_MMAP
b57aee66 58AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
48d848c7 59
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60# AC_FUNC_MALLOC causes problems when cross-compiling.
61#AC_FUNC_MALLOC
62
48d848c7 63# Find arch type
58e9f838 64AS_CASE([$host_cpu],
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65 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
66 [i486], [ARCHTYPE="x86"],
67 [i586], [ARCHTYPE="x86"],
68 [i686], [ARCHTYPE="x86"],
69 [amd64], [ARCHTYPE="x86"],
70 [x86_64], [ARCHTYPE="x86"],
71 [powerpc], [ARCHTYPE="ppc"],
72 [ppc64], [ARCHTYPE="ppc"],
73 [powerpc64], [ARCHTYPE="ppc"],
e4b465e9 74 [powerpc64le], [ARCHTYPE="gcc"],
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75 [ppc], [ARCHTYPE="ppc"],
76 [s390], [ARCHTYPE="s390"],
77 [s390x], [ARCHTYPE="s390"],
171ff3a3 78 [sparc], [ARCHTYPE="sparc64"],
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79 [sparc64], [ARCHTYPE="sparc64"],
80 [alpha*], [ARCHTYPE="alpha"],
81 [ia64], [ARCHTYPE="gcc"],
82 [arm*], [ARCHTYPE="arm"],
e4b465e9 83 [aarch64], [ARCHTYPE="gcc"],
e1259cb1 84 [mips*], [ARCHTYPE="mips"],
274773cf 85 [tile*], [ARCHTYPE="gcc"],
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86 [ARCHTYPE="unknown"]
87)
91b0650a 88
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89AC_SUBST(ARCHTYPE)
90AC_SUBST(SUBARCHTYPE)
5e626e0e 91
a2e7bf9c 92UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 93ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 94
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95AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
96 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
97])
98
58e9f838 99AS_IF([test "$host_cpu" = "armv7l"],[
d1094601 100 AM_CFLAGS="$AM_CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
a6412536 101])
48d848c7 102
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103# ARM-specific checks
104AS_IF([test "x$ARCHTYPE" = "xarm"],[
105 AC_MSG_CHECKING([for dmb instruction])
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106 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
107 int main()
108 {
109 asm volatile("dmb":::"memory");
110 return 0;
111 }
112 ]])
113 ],[
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114 AC_MSG_RESULT([yes])
115 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
116 ],[
117 AC_MSG_RESULT([no])
118 ])
119])
120
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121# Tile-specific checks
122AS_IF([echo "$host_cpu" | grep "^tile"],[
123 AC_MSG_CHECKING([for Tile architecture type])
124 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
125 #ifndef __tilegx__
126 #error
127 #endif
128 ]])
129 ],[
130 AC_MSG_RESULT([ok])
131 ],[
132 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
133 ])
134])
135
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136# x86-specific checks
137AS_IF([test "x$ARCHTYPE" = "xx86"],[
138 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
139 #For now, using lock; addl compatibility mode even for i686, because the
140 #Pentium III is seen as a i686, but lacks mfence instruction.
141 #Only using fence for x86_64.
58e9f838 142 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
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143 AC_MSG_RESULT([yes])
144 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
145 ],[
146 AC_MSG_RESULT([no])
147 ])
148])
149
150# Check if sys_futex() is available
151AC_MSG_CHECKING([for sys_futex()])
fe0707ab 152AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 153 #include <sys/syscall.h>
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154 #ifndef __NR_futex
155 #error "futexes not available"
156 #endif
fe0707ab 157 ]])
a6412536 158],[
0854ccff 159 AC_MSG_RESULT([yes])
02be5561 160 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 161 compat_futex_test=0
91b0650a 162],[
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163 AC_MSG_RESULT([no])
164 compat_futex_test=1
91b0650a 165])
0854ccff 166
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167AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
168AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496 169AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff 170
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171# smp-support configure option
172AC_ARG_ENABLE([smp-support],
173 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
174 [def_smp_support=$enableval],
175 [def_smp_support="yes"])
176AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 177
48d848c7 178
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179# From the sched_setaffinity(2)'s man page:
180# ~~~~
181# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
182# The library interfaces were introduced in glibc 2.3. Initially, the
183# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
184# the cpuset size argument was removed, but this argument was
185# restored in glibc 2.3.4.
186# ~~~~
187
188# In addition to that, some vendors ported the system call to 2.4
189# kernels.
190
191# Furthermore, when the function first appeared, the MASK argument was
192# an unsigned long pointer, while later it was made into a cpu_set_t
193# pointer. Systems that have the cpu_set_t version also should have
194# the CPU_ZERO, CPU_SET, etc. macros.
195
196# All this mess means we have to cater for at least 3 different
197# sched_setaffinity prototypes:
198
199# ~~~~
200# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
201# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
202# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
203# ~~~~
204
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205# Since we define _GNU_SOURCE in the sources, must do so too in the
206# autoconf tests, as defining _GNU_SOURCE or not exposes
207# sched_setaffinity bits differently.
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208saved_CFLAGS="$CFLAGS"
209CFLAGS="$CFLAGS $AM_CFLAGS -D_GNU_SOURCE"
d8540fc5 210
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211AC_CHECK_TYPES([cpu_set_t],
212 [have_cpu_set_t="yes"],
213 [have_cpu_set_t="no"],
214 [#include <sched.h>])
215
216# Confirm that we have CPU_ZERO, and it actually works.
217AC_MSG_CHECKING([whether CPU_ZERO works])
218AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
219AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
220 #define _GNU_SOURCE
221 #include <sched.h>
222 int main()
223 {
224 cpu_set_t foo; CPU_ZERO(&foo);
225 return 0;
226 }
227 ]])
228],[
229 AC_DEFINE(HAVE_CPU_ZERO, 1)
230 AC_MSG_RESULT([yes])
231],[
232 AC_MSG_RESULT([no])
233])
234
235# Confirm that we have CPU_SET, and it actually works.
236AC_MSG_CHECKING([whether CPU_SET works])
237AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
238AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
239 #define _GNU_SOURCE
240 #include <sched.h>
241 int main()
242 {
243 cpu_set_t foo, mask; CPU_SET(0, &foo);
244 return 0;
245 }
246 ]])
247],[
248 AC_DEFINE(HAVE_CPU_SET, 1)
249 AC_MSG_RESULT([yes])
250],[
251 AC_MSG_RESULT([no])
252])
253
d8540fc5 254# First check if the function is available at all.
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255AC_CHECK_FUNCS([sched_setaffinity],[
256 # Okay, we have it. Check if also have cpu_set_t. If we don't,
257 # then we have the first version using unsigned long, and no
258 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
259 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
260 # should also be present, but we confirm nonetheless.
261
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262 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
263 # We do have it.
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264 # Check how many arguments does sched_setaffinity take.
265 # Should be 3 or 2.
266 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 267 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 268 #include <sched.h>
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269 int main()
270 {
271 cpu_set_t foo;
b3231c17 272 sched_setaffinity(0, sizeof (foo), &foo);
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273 return 0;
274 }
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275 ]])
276 ],
277 [sched_set_affinity_args=3],
278 [sched_set_affinity_args=2])
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279 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
280 $sched_set_affinity_args,
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281 [Defined to sched_setaffinity's number of arguments.])
282 AC_MSG_RESULT([$sched_set_affinity_args])
283 ],[
284 # No cpu_set_t, always 3 args.
285 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17 286 ])
a6412536 287])
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288
289CFLAGS=$saved_CFLAGS
d1094601 290AC_SUBST(AM_CFLAGS)
d8540fc5 291
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292AC_CONFIG_LINKS([
293 urcu/arch.h:$ARCHSRC
a2e7bf9c 294 urcu/uatomic.h:$UATOMICSRC
455b809a 295])
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296AC_CONFIG_FILES([
297 Makefile
fe999c05 298 doc/Makefile
8bad63a0 299 doc/examples/Makefile
48d848c7 300 tests/Makefile
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301 tests/common/Makefile
302 tests/unit/Makefile
303 tests/benchmark/Makefile
304 tests/regression/Makefile
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305 liburcu.pc
306 liburcu-bp.pc
a6412536 307 liburcu-cds.pc
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308 liburcu-qsbr.pc
309 liburcu-mb.pc
310 liburcu-signal.pc
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311])
312AC_OUTPUT
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313
314# Report on selected configure options
315AS_IF([test "x$def_smp_support" = "xyes"],[
316 AS_ECHO("SMP support enabled.")
317],[
318 AS_ECHO("SMP support disabled.")
319])
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320
321AS_IF([test "x$def_tls_detect" = "x"],[
322 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
323],[
324 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
325])
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