Configure: add missing check of headers
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
ca617caf 5AC_INIT([userspace-rcu],[0.8.0],[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
45e60038 9AC_SUBST([URCU_LIBRARY_VERSION], [3:0:0])
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])
35eb2d6c 16AM_MAINTAINER_MODE([enable])
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17m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
18
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19m4_include([config/ax_tls.m4])
20
48d848c7 21AC_CONFIG_SRCDIR([urcu.h])
7d413817 22
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23AC_CONFIG_HEADERS([config.h urcu/config.h])
24
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25AH_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.])
26AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
27AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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28AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
29AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
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30AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
31
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32# Allow overriding storage used for TLS variables.
33AC_ARG_ENABLE([compiler-tls],
34 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
35 [def_compiler_tls=$enableval],
36 [def_compiler_tls="yes"])
37
38# If not overridden, use ax_tls.m4 to check if TLS is available.
39AS_IF([test "x$def_compiler_tls" = "xyes"],
40 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
41 [:])
42
43AS_IF([test "x$def_tls_detect" = "x"],
44 [:],
45 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
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46
47# Checks for programs.
48AC_PROG_CC
49AC_PROG_MAKE_SET
b14a378a 50LT_INIT
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51
52# Checks for typedefs, structures, and compiler characteristics.
53AC_C_INLINE
54AC_TYPE_PID_T
55AC_TYPE_SIZE_T
56
57# Checks for library functions.
58AC_FUNC_MALLOC
59AC_FUNC_MMAP
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60AC_CHECK_FUNCS(
61 [bzero gettimeofday munmap sched_getcpu strtoul sysconf gettid memeset strerror]
62)
48d848c7 63
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64# Check for headers
65AC_CHECK_HEADERS([limits.h stddef.h sys/time.h])
66
48d848c7 67# Find arch type
58e9f838 68AS_CASE([$host_cpu],
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69 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
70 [i486], [ARCHTYPE="x86"],
71 [i586], [ARCHTYPE="x86"],
72 [i686], [ARCHTYPE="x86"],
73 [amd64], [ARCHTYPE="x86"],
74 [x86_64], [ARCHTYPE="x86"],
75 [powerpc], [ARCHTYPE="ppc"],
76 [ppc64], [ARCHTYPE="ppc"],
77 [powerpc64], [ARCHTYPE="ppc"],
3913336f 78 [powerpc64le], [ARCHTYPE="gcc"],
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79 [ppc], [ARCHTYPE="ppc"],
80 [s390], [ARCHTYPE="s390"],
81 [s390x], [ARCHTYPE="s390"],
171ff3a3 82 [sparc], [ARCHTYPE="sparc64"],
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83 [sparc64], [ARCHTYPE="sparc64"],
84 [alpha*], [ARCHTYPE="alpha"],
85 [ia64], [ARCHTYPE="gcc"],
86 [arm*], [ARCHTYPE="arm"],
3913336f 87 [aarch64], [ARCHTYPE="gcc"],
e1259cb1 88 [mips*], [ARCHTYPE="mips"],
274773cf 89 [tile*], [ARCHTYPE="gcc"],
13e0bc72 90 [hppa*], [ARCHTYPE="hppa"],
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91 [ARCHTYPE="unknown"]
92)
91b0650a 93
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94AS_CASE([$host],[*-*-linux-androideabi],
95 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
96 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
97)
98
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99AC_SUBST(ARCHTYPE)
100AC_SUBST(SUBARCHTYPE)
5e626e0e 101
a2e7bf9c 102UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 103ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 104
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105AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
106 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
107])
108
58e9f838 109AS_IF([test "$host_cpu" = "armv7l"],[
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110 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
111])
48d848c7 112
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113# ARM-specific checks
114AS_IF([test "x$ARCHTYPE" = "xarm"],[
115 AC_MSG_CHECKING([for dmb instruction])
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116 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
117 int main()
118 {
119 asm volatile("dmb":::"memory");
120 return 0;
121 }
122 ]])
123 ],[
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124 AC_MSG_RESULT([yes])
125 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
126 ],[
127 AC_MSG_RESULT([no])
128 ])
129])
130
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131# Tile-specific checks
132AS_IF([echo "$host_cpu" | grep "^tile"],[
133 AC_MSG_CHECKING([for Tile architecture type])
134 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
135 #ifndef __tilegx__
136 #error
137 #endif
138 ]])
139 ],[
140 AC_MSG_RESULT([ok])
141 ],[
142 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.])
143 ])
144])
145
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146# x86-specific checks
147AS_IF([test "x$ARCHTYPE" = "xx86"],[
148 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
149 #For now, using lock; addl compatibility mode even for i686, because the
150 #Pentium III is seen as a i686, but lacks mfence instruction.
151 #Only using fence for x86_64.
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152 #
153 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
154 #variant but lacks fence instructions.
155 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om"],[
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156 AC_MSG_RESULT([yes])
157 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
158 ],[
159 AC_MSG_RESULT([no])
160 ])
161])
162
163# Check if sys_futex() is available
164AC_MSG_CHECKING([for sys_futex()])
fe0707ab 165AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 166 #include <sys/syscall.h>
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167 #ifndef __NR_futex
168 #error "futexes not available"
169 #endif
fe0707ab 170 ]])
a6412536 171],[
0854ccff 172 AC_MSG_RESULT([yes])
02be5561 173 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 174 compat_futex_test=0
91b0650a 175],[
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176 AC_MSG_RESULT([no])
177 compat_futex_test=1
91b0650a 178])
0854ccff 179
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180# Check for pthread
181AC_CHECK_LIB([pthread], [pthread_create],
182 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
183 [AC_CHECK_LIB([c], [pthread_create],
184 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
185 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
186 )]
187)
188
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189AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
190AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496 191AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff 192
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193# smp-support configure option
194AC_ARG_ENABLE([smp-support],
195 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
196 [def_smp_support=$enableval],
197 [def_smp_support="yes"])
198AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 199
48d848c7 200
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201# From the sched_setaffinity(2)'s man page:
202# ~~~~
203# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
204# The library interfaces were introduced in glibc 2.3. Initially, the
205# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
206# the cpuset size argument was removed, but this argument was
207# restored in glibc 2.3.4.
208# ~~~~
209
210# In addition to that, some vendors ported the system call to 2.4
211# kernels.
212
213# Furthermore, when the function first appeared, the MASK argument was
214# an unsigned long pointer, while later it was made into a cpu_set_t
215# pointer. Systems that have the cpu_set_t version also should have
216# the CPU_ZERO, CPU_SET, etc. macros.
217
218# All this mess means we have to cater for at least 3 different
219# sched_setaffinity prototypes:
220
221# ~~~~
222# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
223# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
224# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
225# ~~~~
226
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227# Since we define _GNU_SOURCE in the sources, must do so too in the
228# autoconf tests, as defining _GNU_SOURCE or not exposes
229# sched_setaffinity bits differently.
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230saved_CFLAGS=$CFLAGS
231CFLAGS="$CFLAGS -D_GNU_SOURCE"
232
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233AC_CHECK_TYPES([cpu_set_t],
234 [have_cpu_set_t="yes"],
235 [have_cpu_set_t="no"],
236 [#include <sched.h>])
237
238# Confirm that we have CPU_ZERO, and it actually works.
239AC_MSG_CHECKING([whether CPU_ZERO works])
240AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
241AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
242 #define _GNU_SOURCE
243 #include <sched.h>
244 int main()
245 {
246 cpu_set_t foo; CPU_ZERO(&foo);
247 return 0;
248 }
249 ]])
250],[
251 AC_DEFINE(HAVE_CPU_ZERO, 1)
252 AC_MSG_RESULT([yes])
253],[
254 AC_MSG_RESULT([no])
255])
256
257# Confirm that we have CPU_SET, and it actually works.
258AC_MSG_CHECKING([whether CPU_SET works])
259AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
260AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
261 #define _GNU_SOURCE
262 #include <sched.h>
263 int main()
264 {
265 cpu_set_t foo, mask; CPU_SET(0, &foo);
266 return 0;
267 }
268 ]])
269],[
270 AC_DEFINE(HAVE_CPU_SET, 1)
271 AC_MSG_RESULT([yes])
272],[
273 AC_MSG_RESULT([no])
274])
275
d8540fc5 276# First check if the function is available at all.
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277AC_CHECK_FUNCS([sched_setaffinity],[
278 # Okay, we have it. Check if also have cpu_set_t. If we don't,
279 # then we have the first version using unsigned long, and no
280 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
281 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
282 # should also be present, but we confirm nonetheless.
283
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284 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
285 # We do have it.
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286 # Check how many arguments does sched_setaffinity take.
287 # Should be 3 or 2.
288 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 289 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 290 #include <sched.h>
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291 int main()
292 {
293 cpu_set_t foo;
b3231c17 294 sched_setaffinity(0, sizeof (foo), &foo);
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295 return 0;
296 }
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297 ]])
298 ],
299 [sched_set_affinity_args=3],
300 [sched_set_affinity_args=2])
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301 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
302 $sched_set_affinity_args,
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303 [Defined to sched_setaffinity's number of arguments.])
304 AC_MSG_RESULT([$sched_set_affinity_args])
305 ],[
306 # No cpu_set_t, always 3 args.
307 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17 308 ])
a6412536 309])
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310
311CFLAGS=$saved_CFLAGS
312
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313AC_CONFIG_LINKS([
314 urcu/arch.h:$ARCHSRC
a2e7bf9c 315 urcu/uatomic.h:$UATOMICSRC
455b809a 316])
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317AC_CONFIG_FILES([
318 Makefile
fe999c05 319 doc/Makefile
8bad63a0 320 doc/examples/Makefile
48d848c7 321 tests/Makefile
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322 tests/common/Makefile
323 tests/unit/Makefile
324 tests/benchmark/Makefile
325 tests/regression/Makefile
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326 liburcu.pc
327 liburcu-bp.pc
a6412536 328 liburcu-cds.pc
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329 liburcu-qsbr.pc
330 liburcu-mb.pc
331 liburcu-signal.pc
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332])
333AC_OUTPUT
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334
335# Report on selected configure options
336AS_IF([test "x$def_smp_support" = "xyes"],[
337 AS_ECHO("SMP support enabled.")
338],[
339 AS_ECHO("SMP support disabled.")
340])
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341
342AS_IF([test "x$def_tls_detect" = "x"],[
343 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
344],[
345 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
346])
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