uatomic-api docs: use the third-person singular
[urcu.git] / configure.ac
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074c3a1b 1AC_PREREQ(2.59)
d5edb898 2AC_INIT([userspace-rcu],[0.10.0-pre],[mathieu dot desnoyers at efficios dot com], [], [http://liburcu.org/])
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3
4# Following the numbering scheme proposed by libtool for the library version
5# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
9e5f4ff4 6AC_SUBST([URCU_LIBRARY_VERSION], [5:0:1])
98bc124a 7
6893800a 8AC_CONFIG_HEADERS([include/config.h include/urcu/config.h])
48d848c7 9AC_CONFIG_AUX_DIR([config])
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10AC_CONFIG_MACRO_DIR([m4])
11
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12AC_CANONICAL_TARGET
13AC_CANONICAL_HOST
074c3a1b 14
6893800a 15AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip nostdinc])
35eb2d6c 16AM_MAINTAINER_MODE([enable])
7d413817 17
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18# Enable silent rules if available (Introduced in AM 1.11)
19m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
e72596d1 20
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21AH_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.])
22AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
23AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.])
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24AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.])
25AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.])
a767fdc3 26AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.])
a0307b90 27AH_TEMPLATE([CONFIG_RCU_HAVE_CLOCK_GETTIME], [clock_gettime() is detected.])
d8d9a340 28AH_TEMPLATE([CONFIG_RCU_FORCE_SYS_MEMBARRIER], [Require the operating system to support the membarrier system call for default and bulletproof flavors.])
d4e640c0 29AH_TEMPLATE([CONFIG_RCU_DEBUG], [Enable internal debugging self-checks. Introduce performance penalty.])
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30
31# Allow requiring the operating system to support the membarrier system
32# call. Applies to default and bulletproof flavors.
33AC_ARG_ENABLE([sys-membarrier-fallback],
34 AS_HELP_STRING([--disable-sys-membarrier-fallback], [Abort if sys-membarrier is needed but not available rather than using a fallback.]),
35 [def_sys_membarrier_fallback=$enableval],
36 [def_sys_membarrier_fallback="yes"])
37AS_IF([test "x$def_sys_membarrier_fallback" != "xyes"], [AC_DEFINE([CONFIG_RCU_FORCE_SYS_MEMBARRIER], [1])])
a767fdc3 38
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39# Allow overriding storage used for TLS variables.
40AC_ARG_ENABLE([compiler-tls],
41 AS_HELP_STRING([--disable-compiler-tls], [Use pthread_getspecific() to emulate Thread Local Storage (TLS) variables.]),
42 [def_compiler_tls=$enableval],
43 [def_compiler_tls="yes"])
44
45# If not overridden, use ax_tls.m4 to check if TLS is available.
46AS_IF([test "x$def_compiler_tls" = "xyes"],
47 [AX_TLS([def_tls_detect=$ac_cv_tls], [:])],
48 [:])
49
50AS_IF([test "x$def_tls_detect" = "x"],
51 [:],
52 [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)])
48d848c7 53
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54# Checks for C compiler
55AC_USE_SYSTEM_EXTENSIONS
48d848c7 56AC_PROG_CC
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57AC_PROG_CC_STDC
58
59# Checks for programs.
27d5e306 60AC_PROG_AWK
48d848c7 61AC_PROG_MAKE_SET
074c3a1b 62AC_CHECK_PROGS(NPROC, [nproc gnproc])
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63AC_CHECK_PROGS(GETCONF, [getconf])
64AS_IF([test "x$NPROC" != "x"],
65 [NPROC_CMD=$NPROC],
66 [AS_IF([test "x$GETCONF" != "x"],
67 [NPROC_CMD="$GETCONF _NPROCESSORS_ONLN"],
68 [NPROC_CMD="echo 1"]
69 )]
70)
71AC_SUBST([NPROC_CMD], [$NPROC_CMD])
72
b14a378a 73LT_INIT
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74
75# Checks for typedefs, structures, and compiler characteristics.
76AC_C_INLINE
77AC_TYPE_PID_T
78AC_TYPE_SIZE_T
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79AC_TYPE_SSIZE_T
80AC_TYPE_UINT16_T
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81AC_TYPE_INT32_T
82AC_TYPE_UINT32_T
83AC_TYPE_UINT64_T
84AC_TYPE_UINT8_T
48d848c7 85
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86AX_C___ATTRIBUTE__
87AS_IF([test "x$ax_cv___attribute__" = "xyes"],
88 [:],
89 [AC_MSG_ERROR([The compiler does not support __attribute__ extensions])])
90
91AX_PTHREAD(,[AC_MSG_ERROR([Could not configure pthreads support])])
92LIBS="$PTHREAD_LIBS $LIBS"
93CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
94CC="$PTHREAD_CC"
95
48d848c7 96# Checks for library functions.
48d848c7 97AC_FUNC_MMAP
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98AC_FUNC_FORK
99AC_CHECK_FUNCS([ \
100 atexit \
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101 getcpuid \
102 gettid \
103 gettimeofday \
104 memeset \
105 memset \
106 munmap \
3e4ae45a 107 rand_r \
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108 sched_getcpu \
109 strerror \
110 strtoul \
111 sysconf \
112])
48d848c7 113
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114# AC_FUNC_MALLOC causes problems when cross-compiling.
115#AC_FUNC_MALLOC
116
bb6afa9a 117# Check for headers
7dea28e7 118AC_HEADER_STDBOOL
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119AC_CHECK_HEADERS([ \
120 limits.h \
121 stddef.h \
122 sys/param.h \
123 sys/time.h \
124])
bb6afa9a 125
48d848c7 126# Find arch type
58e9f838 127AS_CASE([$host_cpu],
52fe6e60 128 [k1om], [ARCHTYPE="x86"],
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129 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
130 [i486], [ARCHTYPE="x86"],
131 [i586], [ARCHTYPE="x86"],
132 [i686], [ARCHTYPE="x86"],
133 [amd64], [ARCHTYPE="x86"],
134 [x86_64], [ARCHTYPE="x86"],
135 [powerpc], [ARCHTYPE="ppc"],
136 [ppc64], [ARCHTYPE="ppc"],
137 [powerpc64], [ARCHTYPE="ppc"],
61126bd9 138 [powerpc64le], [ARCHTYPE="ppc"],
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139 [ppc], [ARCHTYPE="ppc"],
140 [s390], [ARCHTYPE="s390"],
141 [s390x], [ARCHTYPE="s390"],
171ff3a3 142 [sparc], [ARCHTYPE="sparc64"],
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143 [sparc64], [ARCHTYPE="sparc64"],
144 [alpha*], [ARCHTYPE="alpha"],
c21a8d01 145 [ia64], [ARCHTYPE="ia64"],
a6412536 146 [arm*], [ARCHTYPE="arm"],
d1c67842 147 [aarch64*], [ARCHTYPE="aarch64"],
e1259cb1 148 [mips*], [ARCHTYPE="mips"],
859050b3 149 [nios2*], [ARCHTYPE="nios2"],
c23069c6 150 [tile*], [ARCHTYPE="tile"],
13e0bc72 151 [hppa*], [ARCHTYPE="hppa"],
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152 [ARCHTYPE="unknown"]
153)
91b0650a 154
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155AS_CASE([$host],[*-cygwin*],
156 [AM_CONDITIONAL(USE_CYGWIN, true)],
157 [AM_CONDITIONAL(USE_CYGWIN, false)]
158)
159
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160AC_SUBST(ARCHTYPE)
161AC_SUBST(SUBARCHTYPE)
5e626e0e 162
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163UATOMICSRC=include/urcu/uatomic/$ARCHTYPE.h
164ARCHSRC=include/urcu/arch/$ARCHTYPE.h
455b809a 165
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166AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
167 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
168])
169
58e9f838 170AS_IF([test "$host_cpu" = "armv7l"],[
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171 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
172])
48d848c7 173
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174# ARM-specific checks
175AS_IF([test "x$ARCHTYPE" = "xarm"],[
176 AC_MSG_CHECKING([for dmb instruction])
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177 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
178 int main()
179 {
180 asm volatile("dmb":::"memory");
181 return 0;
182 }
183 ]])
184 ],[
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185 AC_MSG_RESULT([yes])
186 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
187 ],[
188 AC_MSG_RESULT([no])
189 ])
190])
191
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192# Tile-specific checks
193AS_IF([echo "$host_cpu" | grep "^tile"],[
194 AC_MSG_CHECKING([for Tile architecture type])
195 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
196 #ifndef __tilegx__
197 #error
198 #endif
199 ]])
200 ],[
201 AC_MSG_RESULT([ok])
202 ],[
203 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
204 ])
205])
206
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207# x86-specific checks
208AS_IF([test "x$ARCHTYPE" = "xx86"],[
209 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
210 #For now, using lock; addl compatibility mode even for i686, because the
211 #Pentium III is seen as a i686, but lacks mfence instruction.
212 #Only using fence for x86_64.
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213 #
214 #k1om is the name for the Intel MIC family (Xeon Phi). It is an x86_64
215 #variant but lacks fence instructions.
52fe6e60 216 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686" -a "x$host_vendor" != "xk1om" -a "x$host_cpu" != "xk1om"],[
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217 AC_MSG_RESULT([yes])
218 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
219 ],[
220 AC_MSG_RESULT([no])
221 ])
222])
223
224# Check if sys_futex() is available
225AC_MSG_CHECKING([for sys_futex()])
fe0707ab 226AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 227 #include <sys/syscall.h>
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228 #ifndef __NR_futex
229 #error "futexes not available"
230 #endif
fe0707ab 231 ]])
a6412536 232],[
0854ccff 233 AC_MSG_RESULT([yes])
02be5561 234 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 235 compat_futex_test=0
91b0650a 236],[
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237 AC_MSG_RESULT([no])
238 compat_futex_test=1
91b0650a 239])
0854ccff 240
8be0fb5f 241# Search for clock_gettime
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242AC_SEARCH_LIBS([clock_gettime], [rt], [
243 AC_DEFINE([CONFIG_RCU_HAVE_CLOCK_GETTIME], [1])
244], [])
8be0fb5f 245
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246AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
247AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496 248AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff 249
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250# smp-support configure option
251AC_ARG_ENABLE([smp-support],
252 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
253 [def_smp_support=$enableval],
254 [def_smp_support="yes"])
255AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 256
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257# RCU debugging option
258AC_ARG_ENABLE([rcu-debug],
259 AS_HELP_STRING([--enable-rcu-debug], [Enable internal debugging
260 self-checks. Introduce performance penalty.]))
261AS_IF([test "x$enable_rcu_debug" = "xyes"], [
262 AC_DEFINE([CONFIG_RCU_DEBUG], [1])
263])
48d848c7 264
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265# From the sched_setaffinity(2)'s man page:
266# ~~~~
267# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
268# The library interfaces were introduced in glibc 2.3. Initially, the
269# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
270# the cpuset size argument was removed, but this argument was
271# restored in glibc 2.3.4.
272# ~~~~
273
274# In addition to that, some vendors ported the system call to 2.4
275# kernels.
276
277# Furthermore, when the function first appeared, the MASK argument was
278# an unsigned long pointer, while later it was made into a cpu_set_t
279# pointer. Systems that have the cpu_set_t version also should have
280# the CPU_ZERO, CPU_SET, etc. macros.
281
282# All this mess means we have to cater for at least 3 different
283# sched_setaffinity prototypes:
284
285# ~~~~
286# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
287# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
288# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
289# ~~~~
290
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291AC_CHECK_TYPES([cpu_set_t],
292 [have_cpu_set_t="yes"],
293 [have_cpu_set_t="no"],
294 [#include <sched.h>])
295
296# Confirm that we have CPU_ZERO, and it actually works.
297AC_MSG_CHECKING([whether CPU_ZERO works])
298AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
299AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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300 #include <sched.h>
301 int main()
302 {
303 cpu_set_t foo; CPU_ZERO(&foo);
304 return 0;
305 }
306 ]])
307],[
308 AC_DEFINE(HAVE_CPU_ZERO, 1)
309 AC_MSG_RESULT([yes])
310],[
311 AC_MSG_RESULT([no])
312])
313
314# Confirm that we have CPU_SET, and it actually works.
315AC_MSG_CHECKING([whether CPU_SET works])
316AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
317AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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318 #include <sched.h>
319 int main()
320 {
321 cpu_set_t foo, mask; CPU_SET(0, &foo);
322 return 0;
323 }
324 ]])
325],[
326 AC_DEFINE(HAVE_CPU_SET, 1)
327 AC_MSG_RESULT([yes])
328],[
329 AC_MSG_RESULT([no])
330])
331
d8540fc5 332# First check if the function is available at all.
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333AC_CHECK_FUNCS([sched_setaffinity],[
334 # Okay, we have it. Check if also have cpu_set_t. If we don't,
335 # then we have the first version using unsigned long, and no
336 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
337 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
338 # should also be present, but we confirm nonetheless.
339
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340 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
341 # We do have it.
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342 # Check how many arguments does sched_setaffinity take.
343 # Should be 3 or 2.
344 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 345 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 346 #include <sched.h>
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347 int main()
348 {
349 cpu_set_t foo;
b3231c17 350 sched_setaffinity(0, sizeof (foo), &foo);
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351 return 0;
352 }
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353 ]])
354 ],
355 [sched_set_affinity_args=3],
356 [sched_set_affinity_args=2])
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357 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
358 $sched_set_affinity_args,
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359 [Defined to sched_setaffinity's number of arguments.])
360 AC_MSG_RESULT([$sched_set_affinity_args])
361 ],[
362 # No cpu_set_t, always 3 args.
363 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17 364 ])
a6412536 365])
d8540fc5 366
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367DEFAULT_INCLUDES="-include config.h"
368AC_SUBST(DEFAULT_INCLUDES)
d8540fc5 369
455b809a 370AC_CONFIG_LINKS([
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371 include/urcu/arch.h:$ARCHSRC
372 include/urcu/uatomic.h:$UATOMICSRC
455b809a 373])
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374AC_CONFIG_FILES([
375 Makefile
fe999c05 376 doc/Makefile
8bad63a0 377 doc/examples/Makefile
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378 include/Makefile
379 src/Makefile
48d848c7 380 tests/Makefile
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381 tests/common/Makefile
382 tests/unit/Makefile
383 tests/benchmark/Makefile
384 tests/regression/Makefile
074c3a1b 385 tests/regression/regression_tests
1b387491 386 tests/utils/Makefile
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387 src/liburcu.pc
388 src/liburcu-bp.pc
389 src/liburcu-cds.pc
390 src/liburcu-qsbr.pc
391 src/liburcu-mb.pc
392 src/liburcu-signal.pc
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393])
394AC_OUTPUT
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395
396# Report on selected configure options
397AS_IF([test "x$def_smp_support" = "xyes"],[
398 AS_ECHO("SMP support enabled.")
399],[
400 AS_ECHO("SMP support disabled.")
401])
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402
403AS_IF([test "x$def_tls_detect" = "x"],[
404 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
405],[
406 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
407])
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