Blacklist ARM gcc 4.8.0, 4.8.1, 4.8.2
[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], $def_tls_detect)])
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45
46# Checks for programs.
47AC_PROG_CC
48AC_PROG_MAKE_SET
b14a378a 49LT_INIT
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50
51# Checks for typedefs, structures, and compiler characteristics.
52AC_C_INLINE
53AC_TYPE_PID_T
54AC_TYPE_SIZE_T
55
56# Checks for library functions.
57AC_FUNC_MALLOC
58AC_FUNC_MMAP
b57aee66 59AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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60
61# Find arch type
58e9f838 62AS_CASE([$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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85AC_SUBST(ARCHTYPE)
86AC_SUBST(SUBARCHTYPE)
5e626e0e 87
a2e7bf9c 88UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 89ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 90
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91AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
92 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
93])
94
58e9f838 95AS_IF([test "$host_cpu" = "armv7l"],[
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96 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
97])
48d848c7 98
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99# ARM-specific checks
100AS_IF([test "x$ARCHTYPE" = "xarm"],[
101 AC_MSG_CHECKING([for dmb instruction])
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102 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
103 int main()
104 {
105 asm volatile("dmb":::"memory");
106 return 0;
107 }
108 ]])
109 ],[
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110 AC_MSG_RESULT([yes])
111 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
112 ],[
113 AC_MSG_RESULT([no])
114 ])
115])
116
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117# Tile-specific checks
118AS_IF([echo "$host_cpu" | grep "^tile"],[
119 AC_MSG_CHECKING([for Tile architecture type])
120 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
121 #ifndef __tilegx__
122 #error
123 #endif
124 ]])
125 ],[
126 AC_MSG_RESULT([ok])
127 ],[
128 AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.])
129 ])
130])
131
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132# x86-specific checks
133AS_IF([test "x$ARCHTYPE" = "xx86"],[
134 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
135 #For now, using lock; addl compatibility mode even for i686, because the
136 #Pentium III is seen as a i686, but lacks mfence instruction.
137 #Only using fence for x86_64.
58e9f838 138 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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139 AC_MSG_RESULT([yes])
140 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
141 ],[
142 AC_MSG_RESULT([no])
143 ])
144])
145
146# Check if sys_futex() is available
147AC_MSG_CHECKING([for sys_futex()])
fe0707ab 148AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 149 #include <sys/syscall.h>
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150 #ifndef __NR_futex
151 #error "futexes not available"
152 #endif
fe0707ab 153 ]])
a6412536 154],[
0854ccff 155 AC_MSG_RESULT([yes])
02be5561 156 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 157 compat_futex_test=0
91b0650a 158],[
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159 AC_MSG_RESULT([no])
160 compat_futex_test=1
91b0650a 161])
0854ccff 162
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163AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
164AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
2f49a496 165AM_CONDITIONAL([NO_SHARED], [test "x$enable_shared" = "xno"])
0854ccff 166
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167# smp-support configure option
168AC_ARG_ENABLE([smp-support],
169 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
170 [def_smp_support=$enableval],
171 [def_smp_support="yes"])
172AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 173
48d848c7 174
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175# From the sched_setaffinity(2)'s man page:
176# ~~~~
177# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
178# The library interfaces were introduced in glibc 2.3. Initially, the
179# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
180# the cpuset size argument was removed, but this argument was
181# restored in glibc 2.3.4.
182# ~~~~
183
184# In addition to that, some vendors ported the system call to 2.4
185# kernels.
186
187# Furthermore, when the function first appeared, the MASK argument was
188# an unsigned long pointer, while later it was made into a cpu_set_t
189# pointer. Systems that have the cpu_set_t version also should have
190# the CPU_ZERO, CPU_SET, etc. macros.
191
192# All this mess means we have to cater for at least 3 different
193# sched_setaffinity prototypes:
194
195# ~~~~
196# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
197# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
198# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
199# ~~~~
200
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201# Since we define _GNU_SOURCE in the sources, must do so too in the
202# autoconf tests, as defining _GNU_SOURCE or not exposes
203# sched_setaffinity bits differently.
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204saved_CFLAGS=$CFLAGS
205CFLAGS="$CFLAGS -D_GNU_SOURCE"
206
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207AC_CHECK_TYPES([cpu_set_t],
208 [have_cpu_set_t="yes"],
209 [have_cpu_set_t="no"],
210 [#include <sched.h>])
211
212# Confirm that we have CPU_ZERO, and it actually works.
213AC_MSG_CHECKING([whether CPU_ZERO works])
214AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
215AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
216 #define _GNU_SOURCE
217 #include <sched.h>
218 int main()
219 {
220 cpu_set_t foo; CPU_ZERO(&foo);
221 return 0;
222 }
223 ]])
224],[
225 AC_DEFINE(HAVE_CPU_ZERO, 1)
226 AC_MSG_RESULT([yes])
227],[
228 AC_MSG_RESULT([no])
229])
230
231# Confirm that we have CPU_SET, and it actually works.
232AC_MSG_CHECKING([whether CPU_SET works])
233AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works])
234AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
235 #define _GNU_SOURCE
236 #include <sched.h>
237 int main()
238 {
239 cpu_set_t foo, mask; CPU_SET(0, &foo);
240 return 0;
241 }
242 ]])
243],[
244 AC_DEFINE(HAVE_CPU_SET, 1)
245 AC_MSG_RESULT([yes])
246],[
247 AC_MSG_RESULT([no])
248])
249
d8540fc5 250# First check if the function is available at all.
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251AC_CHECK_FUNCS([sched_setaffinity],[
252 # Okay, we have it. Check if also have cpu_set_t. If we don't,
253 # then we have the first version using unsigned long, and no
254 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
255 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
256 # should also be present, but we confirm nonetheless.
257
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258 AS_IF([test "x$have_cpu_set_t" = "xyes"], [
259 # We do have it.
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260 # Check how many arguments does sched_setaffinity take.
261 # Should be 3 or 2.
262 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 263 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 264 #include <sched.h>
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265 int main()
266 {
267 cpu_set_t foo;
b3231c17 268 sched_setaffinity(0, sizeof (foo), &foo);
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269 return 0;
270 }
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271 ]])
272 ],
273 [sched_set_affinity_args=3],
274 [sched_set_affinity_args=2])
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275 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS,
276 $sched_set_affinity_args,
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277 [Defined to sched_setaffinity's number of arguments.])
278 AC_MSG_RESULT([$sched_set_affinity_args])
279 ],[
280 # No cpu_set_t, always 3 args.
281 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
b3231c17 282 ])
a6412536 283])
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284
285CFLAGS=$saved_CFLAGS
286
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287AC_CONFIG_LINKS([
288 urcu/arch.h:$ARCHSRC
a2e7bf9c 289 urcu/uatomic.h:$UATOMICSRC
455b809a 290])
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291AC_CONFIG_FILES([
292 Makefile
fe999c05 293 doc/Makefile
8bad63a0 294 doc/examples/Makefile
48d848c7 295 tests/Makefile
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296 tests/common/Makefile
297 tests/unit/Makefile
298 tests/benchmark/Makefile
299 tests/regression/Makefile
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300 liburcu.pc
301 liburcu-bp.pc
a6412536 302 liburcu-cds.pc
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303 liburcu-qsbr.pc
304 liburcu-mb.pc
305 liburcu-signal.pc
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306])
307AC_OUTPUT
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308
309# Report on selected configure options
310AS_IF([test "x$def_smp_support" = "xyes"],[
311 AS_ECHO("SMP support enabled.")
312],[
313 AS_ECHO("SMP support disabled.")
314])
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315
316AS_IF([test "x$def_tls_detect" = "x"],[
317 AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().")
318],[
319 AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.")
320])
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