Fix undefined NULL pointer arithmetic in hlist
[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])
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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], $def_tls_detect)])
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45
46# Checks for programs.
47AC_PROG_CC
48AC_PROG_MAKE_SET
b14a378a 49LT_INIT
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50
51# Checks for typedefs, structures, and compiler characteristics.
52AC_C_INLINE
53AC_TYPE_PID_T
54AC_TYPE_SIZE_T
55
56# Checks for library functions.
57AC_FUNC_MALLOC
58AC_FUNC_MMAP
6bbcdc42 59AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf gettid])
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60
61# Find arch type
58e9f838 62AS_CASE([$host_cpu],
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63 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
64 [i486], [ARCHTYPE="x86"],
65 [i586], [ARCHTYPE="x86"],
66 [i686], [ARCHTYPE="x86"],
67 [amd64], [ARCHTYPE="x86"],
68 [x86_64], [ARCHTYPE="x86"],
69 [powerpc], [ARCHTYPE="ppc"],
70 [ppc64], [ARCHTYPE="ppc"],
71 [powerpc64], [ARCHTYPE="ppc"],
72 [ppc], [ARCHTYPE="ppc"],
73 [s390], [ARCHTYPE="s390"],
74 [s390x], [ARCHTYPE="s390"],
171ff3a3 75 [sparc], [ARCHTYPE="sparc64"],
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76 [sparc64], [ARCHTYPE="sparc64"],
77 [alpha*], [ARCHTYPE="alpha"],
78 [ia64], [ARCHTYPE="gcc"],
79 [arm*], [ARCHTYPE="arm"],
e1259cb1 80 [mips*], [ARCHTYPE="mips"],
274773cf 81 [tile*], [ARCHTYPE="gcc"],
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82 [ARCHTYPE="unknown"]
83)
91b0650a 84
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85AS_CASE([$host],[*-*-linux-androideabi],
86 [AM_CONDITIONAL(TARGET_IS_ANDROID, true)],
87 [AM_CONDITIONAL(TARGET_IS_ANDROID, false)]
88)
89
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90AC_SUBST(ARCHTYPE)
91AC_SUBST(SUBARCHTYPE)
5e626e0e 92
a2e7bf9c 93UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 94ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 95
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96AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
97 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
98])
99
58e9f838 100AS_IF([test "$host_cpu" = "armv7l"],[
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101 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
102])
48d848c7 103
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104# ARM-specific checks
105AS_IF([test "x$ARCHTYPE" = "xarm"],[
106 AC_MSG_CHECKING([for dmb instruction])
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107 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
108 int main()
109 {
110 asm volatile("dmb":::"memory");
111 return 0;
112 }
113 ]])
114 ],[
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115 AC_MSG_RESULT([yes])
116 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
117 ],[
118 AC_MSG_RESULT([no])
119 ])
120])
121
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122# Tile-specific checks
123AS_IF([echo "$host_cpu" | grep "^tile"],[
124 AC_MSG_CHECKING([for Tile architecture type])
125 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
126 #ifndef __tilegx__
127 #error
128 #endif
129 ]])
130 ],[
131 AC_MSG_RESULT([ok])
132 ],[
133 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.])
134 ])
135])
136
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137# x86-specific checks
138AS_IF([test "x$ARCHTYPE" = "xx86"],[
139 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
140 #For now, using lock; addl compatibility mode even for i686, because the
141 #Pentium III is seen as a i686, but lacks mfence instruction.
142 #Only using fence for x86_64.
58e9f838 143 AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[
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144 AC_MSG_RESULT([yes])
145 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
146 ],[
147 AC_MSG_RESULT([no])
148 ])
149])
150
151# Check if sys_futex() is available
152AC_MSG_CHECKING([for sys_futex()])
fe0707ab 153AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 154 #include <sys/syscall.h>
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155 #ifndef __NR_futex
156 #error "futexes not available"
157 #endif
fe0707ab 158 ]])
a6412536 159],[
0854ccff 160 AC_MSG_RESULT([yes])
02be5561 161 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 162 compat_futex_test=0
91b0650a 163],[
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164 AC_MSG_RESULT([no])
165 compat_futex_test=1
91b0650a 166])
0854ccff 167
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168# Check for pthread
169AC_CHECK_LIB([pthread], [pthread_create],
170 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, false)],
171 [AC_CHECK_LIB([c], [pthread_create],
172 [AM_CONDITIONAL(LIBC_INCLUDES_PTHREAD, true)],
173 [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
174 )]
175)
176
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177AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
178AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496 179AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff 180
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181# smp-support configure option
182AC_ARG_ENABLE([smp-support],
183 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
184 [def_smp_support=$enableval],
185 [def_smp_support="yes"])
186AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 187
48d848c7 188
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189# From the sched_setaffinity(2)'s man page:
190# ~~~~
191# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
192# The library interfaces were introduced in glibc 2.3. Initially, the
193# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
194# the cpuset size argument was removed, but this argument was
195# restored in glibc 2.3.4.
196# ~~~~
197
198# In addition to that, some vendors ported the system call to 2.4
199# kernels.
200
201# Furthermore, when the function first appeared, the MASK argument was
202# an unsigned long pointer, while later it was made into a cpu_set_t
203# pointer. Systems that have the cpu_set_t version also should have
204# the CPU_ZERO, CPU_SET, etc. macros.
205
206# All this mess means we have to cater for at least 3 different
207# sched_setaffinity prototypes:
208
209# ~~~~
210# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
211# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
212# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
213# ~~~~
214
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215# Since we define _GNU_SOURCE in the sources, must do so too in the
216# autoconf tests, as defining _GNU_SOURCE or not exposes
217# sched_setaffinity bits differently.
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218saved_CFLAGS=$CFLAGS
219CFLAGS="$CFLAGS -D_GNU_SOURCE"
220
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221AC_CHECK_TYPES([cpu_set_t],
222 [have_cpu_set_t="yes"],
223 [have_cpu_set_t="no"],
224 [#include <sched.h>])
225
226# Confirm that we have CPU_ZERO, and it actually works.
227AC_MSG_CHECKING([whether CPU_ZERO works])
228AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
229AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
230 #define _GNU_SOURCE
231 #include <sched.h>
232 int main()
233 {
234 cpu_set_t foo; CPU_ZERO(&foo);
235 return 0;
236 }
237 ]])
238],[
239 AC_DEFINE(HAVE_CPU_ZERO, 1)
240 AC_MSG_RESULT([yes])
241],[
242 AC_MSG_RESULT([no])
243])
244
245# Confirm that we have CPU_SET, and it actually works.
246AC_MSG_CHECKING([whether CPU_SET works])
247AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
248AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
249 #define _GNU_SOURCE
250 #include <sched.h>
251 int main()
252 {
253 cpu_set_t foo, mask; CPU_SET(0, &foo);
254 return 0;
255 }
256 ]])
257],[
258 AC_DEFINE(HAVE_CPU_SET, 1)
259 AC_MSG_RESULT([yes])
260],[
261 AC_MSG_RESULT([no])
262])
263
d8540fc5 264# First check if the function is available at all.
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265AC_CHECK_FUNCS([sched_setaffinity],[
266 # Okay, we have it. Check if also have cpu_set_t. If we don't,
267 # then we have the first version using unsigned long, and no
268 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
269 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
270 # should also be present, but we confirm nonetheless.
271
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272 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
273 # We do have it.
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274 # Check how many arguments does sched_setaffinity take.
275 # Should be 3 or 2.
276 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 277 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 278 #include <sched.h>
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279 int main()
280 {
281 cpu_set_t foo;
b3231c17 282 sched_setaffinity(0, sizeof (foo), &foo);
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283 return 0;
284 }
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285 ]])
286 ],
287 [sched_set_affinity_args=3],
288 [sched_set_affinity_args=2])
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289 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
290 $sched_set_affinity_args,
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291 [Defined to sched_setaffinity's number of arguments.])
292 AC_MSG_RESULT([$sched_set_affinity_args])
293 ],[
294 # No cpu_set_t, always 3 args.
295 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17 296 ])
a6412536 297])
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298
299CFLAGS=$saved_CFLAGS
300
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301AC_CONFIG_LINKS([
302 urcu/arch.h:$ARCHSRC
a2e7bf9c 303 urcu/uatomic.h:$UATOMICSRC
455b809a 304])
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305AC_CONFIG_FILES([
306 Makefile
fe999c05 307 doc/Makefile
8bad63a0 308 doc/examples/Makefile
48d848c7 309 tests/Makefile
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310 tests/common/Makefile
311 tests/unit/Makefile
312 tests/benchmark/Makefile
313 tests/regression/Makefile
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314 liburcu.pc
315 liburcu-bp.pc
a6412536 316 liburcu-cds.pc
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317 liburcu-qsbr.pc
318 liburcu-mb.pc
319 liburcu-signal.pc
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320])
321AC_OUTPUT
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322
323# Report on selected configure options
324AS_IF([test "x$def_smp_support" = "xyes"],[
325 AS_ECHO("SMP support enabled.")
326],[
327 AS_ECHO("SMP support disabled.")
328])
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329
330AS_IF([test "x$def_tls_detect" = "x"],[
331 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
332],[
333 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
334])
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