Fix: cross-build: configure.ac should use --target, not --host
[urcu.git] / configure.ac
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1# -*- Autoconf -*-
2# Process this file with autoconf to produce a configure script.
3
4
ae51baf2 5AC_INIT([userspace-rcu],[0.7.4],[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
1de4df4b 9AC_SUBST([URCU_LIBRARY_VERSION], [2:0:0])
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
450b9709 31AX_TLS(AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $ac_cv_tls), [:])
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32
33# Checks for programs.
34AC_PROG_CC
35AC_PROG_MAKE_SET
b14a378a 36LT_INIT
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37
38# Checks for typedefs, structures, and compiler characteristics.
39AC_C_INLINE
40AC_TYPE_PID_T
41AC_TYPE_SIZE_T
42
43# Checks for library functions.
44AC_FUNC_MALLOC
45AC_FUNC_MMAP
b57aee66 46AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf])
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47
48# Find arch type
1eade46a 49AS_CASE([$target_cpu],
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50 [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"],
51 [i486], [ARCHTYPE="x86"],
52 [i586], [ARCHTYPE="x86"],
53 [i686], [ARCHTYPE="x86"],
54 [amd64], [ARCHTYPE="x86"],
55 [x86_64], [ARCHTYPE="x86"],
56 [powerpc], [ARCHTYPE="ppc"],
57 [ppc64], [ARCHTYPE="ppc"],
58 [powerpc64], [ARCHTYPE="ppc"],
59 [ppc], [ARCHTYPE="ppc"],
60 [s390], [ARCHTYPE="s390"],
61 [s390x], [ARCHTYPE="s390"],
62 [sparc64], [ARCHTYPE="sparc64"],
63 [alpha*], [ARCHTYPE="alpha"],
64 [ia64], [ARCHTYPE="gcc"],
65 [arm*], [ARCHTYPE="arm"],
e1259cb1 66 [mips*], [ARCHTYPE="mips"],
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67 [ARCHTYPE="unknown"]
68)
91b0650a 69
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70AC_SUBST(ARCHTYPE)
71AC_SUBST(SUBARCHTYPE)
5e626e0e 72
a2e7bf9c 73UATOMICSRC=urcu/uatomic/$ARCHTYPE.h
1b9119f8 74ARCHSRC=urcu/arch/$ARCHTYPE.h
455b809a 75
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76AS_IF([test "x$SUBARCHTYPE" = xx86compat],[
77 AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1])
78])
79
1eade46a 80AS_IF([test "$target_cpu" = "armv7l"],[
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81 CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1"
82])
48d848c7 83
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84# ARM-specific checks
85AS_IF([test "x$ARCHTYPE" = "xarm"],[
86 AC_MSG_CHECKING([for dmb instruction])
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87 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
88 int main()
89 {
90 asm volatile("dmb":::"memory");
91 return 0;
92 }
93 ]])
94 ],[
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95 AC_MSG_RESULT([yes])
96 AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1])
97 ],[
98 AC_MSG_RESULT([no])
99 ])
100])
101
102# x86-specific checks
103AS_IF([test "x$ARCHTYPE" = "xx86"],[
104 AC_MSG_CHECKING([if architecture really supports the mfence instruction])
105 #For now, using lock; addl compatibility mode even for i686, because the
106 #Pentium III is seen as a i686, but lacks mfence instruction.
107 #Only using fence for x86_64.
1eade46a 108 AS_IF([test "x$target_cpu" != "xi386" -a "x$target_cpu" != "xi486" -a "x$target_cpu" != "xi586" -a "x$target_cpu" != "xi686"],[
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109 AC_MSG_RESULT([yes])
110 AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1])
111 ],[
112 AC_MSG_RESULT([no])
113 ])
114])
115
116# Check if sys_futex() is available
117AC_MSG_CHECKING([for sys_futex()])
fe0707ab 118AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 119 #include <sys/syscall.h>
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120 #ifndef __NR_futex
121 #error "futexes not available"
122 #endif
fe0707ab 123 ]])
a6412536 124],[
0854ccff 125 AC_MSG_RESULT([yes])
02be5561 126 AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1])
0854ccff 127 compat_futex_test=0
91b0650a 128],[
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129 AC_MSG_RESULT([no])
130 compat_futex_test=1
91b0650a 131])
0854ccff 132
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133AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"])
134AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"])
0854ccff 135
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136# smp-support configure option
137AC_ARG_ENABLE([smp-support],
138 AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]),
139 [def_smp_support=$enableval],
140 [def_smp_support="yes"])
141AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])])
7d413817 142
48d848c7 143
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144# From the sched_setaffinity(2)'s man page:
145# ~~~~
146# The CPU affinity system calls were introduced in Linux kernel 2.5.8.
147# The library interfaces were introduced in glibc 2.3. Initially, the
148# glibc interfaces included a cpusetsize argument. In glibc 2.3.3,
149# the cpuset size argument was removed, but this argument was
150# restored in glibc 2.3.4.
151# ~~~~
152
153# In addition to that, some vendors ported the system call to 2.4
154# kernels.
155
156# Furthermore, when the function first appeared, the MASK argument was
157# an unsigned long pointer, while later it was made into a cpu_set_t
158# pointer. Systems that have the cpu_set_t version also should have
159# the CPU_ZERO, CPU_SET, etc. macros.
160
161# All this mess means we have to cater for at least 3 different
162# sched_setaffinity prototypes:
163
164# ~~~~
165# int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask);
166# int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset);
167# int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
168# ~~~~
169
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170# Since we define _GNU_SOURCE in the sources, must do so too in the
171# autoconf tests, as defining _GNU_SOURCE or not exposes
172# sched_setaffinity bits differently.
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173saved_CFLAGS=$CFLAGS
174CFLAGS="$CFLAGS -D_GNU_SOURCE"
175
176# First check if the function is available at all.
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177AC_CHECK_FUNCS([sched_setaffinity],[
178 # Okay, we have it. Check if also have cpu_set_t. If we don't,
179 # then we have the first version using unsigned long, and no
180 # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the
181 # version with 2 or 3 arguments. In that case, CPU_ZERO, etc.,
182 # should also be present, but we confirm nonetheless.
183
184 AC_CHECK_TYPES([cpu_set_t],[
185 # We do have it. Confirm that we have CPU_ZERO, and it actually works.
186 AC_MSG_CHECKING([whether CPU_ZERO works])
187 AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works])
ec5e2d14 188 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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189 #define _GNU_SOURCE
190 #include <sched.h>
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191 int main()
192 {
193 cpu_set_t foo; CPU_ZERO (&foo);
194 return 0;
195 }
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196 ]])
197 ],[
198 # Works!
199 AC_DEFINE(HAVE_CPU_ZERO, 1)
200 AC_MSG_RESULT([yes])
201 ],[
202 AC_MSG_RESULT([no])
203 ])
204
205 # Check how many arguments does sched_setaffinity take.
206 # Should be 3 or 2.
207 AC_MSG_CHECKING([how many arguments sched_setaffinity takes])
ec5e2d14 208 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
a6412536 209 #include <sched.h>
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210 int main()
211 {
212 cpu_set_t foo;
213 sched_setaffinity (0, sizeof (foo), &foo);
214 return 0;
215 }
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216 ]])
217 ],
218 [sched_set_affinity_args=3],
219 [sched_set_affinity_args=2])
220 AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args,
221 [Defined to sched_setaffinity's number of arguments.])
222 AC_MSG_RESULT([$sched_set_affinity_args])
223 ],[
224 # No cpu_set_t, always 3 args.
225 AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3)
226 ],
227 [#include <sched.h>])
228])
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229
230CFLAGS=$saved_CFLAGS
231
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232AC_CONFIG_LINKS([
233 urcu/arch.h:$ARCHSRC
a2e7bf9c 234 urcu/uatomic.h:$UATOMICSRC
455b809a 235])
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236AC_CONFIG_FILES([
237 Makefile
fe999c05 238 doc/Makefile
48d848c7 239 tests/Makefile
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240 liburcu.pc
241 liburcu-bp.pc
a6412536 242 liburcu-cds.pc
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243 liburcu-qsbr.pc
244 liburcu-mb.pc
245 liburcu-signal.pc
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246])
247AC_OUTPUT
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248
249# Report on selected configure options
250AS_IF([test "x$def_smp_support" = "xyes"],[
251 AS_ECHO("SMP support enabled.")
252],[
253 AS_ECHO("SMP support disabled.")
254])
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