| 1 | # -*- Autoconf -*- |
| 2 | # Process this file with autoconf to produce a configure script. |
| 3 | |
| 4 | |
| 5 | AC_INIT([userspace-rcu],[0.7.4],[mathieu dot desnoyers at efficios dot com]) |
| 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 |
| 9 | AC_SUBST([URCU_LIBRARY_VERSION], [2:0:0]) |
| 10 | |
| 11 | AC_CONFIG_AUX_DIR([config]) |
| 12 | AC_CONFIG_MACRO_DIR([config]) |
| 13 | AC_CANONICAL_TARGET |
| 14 | AC_CANONICAL_HOST |
| 15 | AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip]) |
| 16 | m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])]) |
| 17 | |
| 18 | m4_include([config/ax_tls.m4]) |
| 19 | |
| 20 | AC_CONFIG_SRCDIR([urcu.h]) |
| 21 | |
| 22 | AC_CONFIG_HEADERS([config.h urcu/config.h]) |
| 23 | |
| 24 | AH_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.]) |
| 25 | AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.]) |
| 26 | AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.]) |
| 27 | AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.]) |
| 28 | AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.]) |
| 29 | AH_TEMPLATE([CONFIG_RCU_TLS], [TLS provided by the compiler.]) |
| 30 | |
| 31 | # Allow overriding storage used for TLS variables. |
| 32 | AC_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=$enableval], |
| 35 | [def_compiler_tls="yes"]) |
| 36 | |
| 37 | # If not overridden, use ax_tls.m4 to check if TLS is available. |
| 38 | AS_IF([test "x$def_compiler_tls" = "xyes"], |
| 39 | [AX_TLS([def_tls_detect=$ac_cv_tls], [:])], |
| 40 | [:]) |
| 41 | |
| 42 | AS_IF([test "x$def_tls_detect" = "x"], |
| 43 | [:], |
| 44 | [AC_DEFINE_UNQUOTED([CONFIG_RCU_TLS], $def_tls_detect)]) |
| 45 | |
| 46 | # Checks for programs. |
| 47 | AC_PROG_CC |
| 48 | AC_PROG_MAKE_SET |
| 49 | LT_INIT |
| 50 | |
| 51 | # Checks for typedefs, structures, and compiler characteristics. |
| 52 | AC_C_INLINE |
| 53 | AC_TYPE_PID_T |
| 54 | AC_TYPE_SIZE_T |
| 55 | |
| 56 | # Checks for library functions. |
| 57 | AC_FUNC_MALLOC |
| 58 | AC_FUNC_MMAP |
| 59 | AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf]) |
| 60 | |
| 61 | # Find arch type |
| 62 | AS_CASE([$host_cpu], |
| 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"], |
| 75 | [sparc], [ARCHTYPE="sparc64"], |
| 76 | [sparc64], [ARCHTYPE="sparc64"], |
| 77 | [alpha*], [ARCHTYPE="alpha"], |
| 78 | [ia64], [ARCHTYPE="gcc"], |
| 79 | [arm*], [ARCHTYPE="arm"], |
| 80 | [mips*], [ARCHTYPE="mips"], |
| 81 | [tile*], [ARCHTYPE="gcc"], |
| 82 | [ARCHTYPE="unknown"] |
| 83 | ) |
| 84 | |
| 85 | AC_SUBST(ARCHTYPE) |
| 86 | AC_SUBST(SUBARCHTYPE) |
| 87 | |
| 88 | UATOMICSRC=urcu/uatomic/$ARCHTYPE.h |
| 89 | ARCHSRC=urcu/arch/$ARCHTYPE.h |
| 90 | |
| 91 | AS_IF([test "x$SUBARCHTYPE" = xx86compat],[ |
| 92 | AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1]) |
| 93 | ]) |
| 94 | |
| 95 | AS_IF([test "$host_cpu" = "armv7l"],[ |
| 96 | CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1" |
| 97 | ]) |
| 98 | |
| 99 | # ARM-specific checks |
| 100 | AS_IF([test "x$ARCHTYPE" = "xarm"],[ |
| 101 | AC_MSG_CHECKING([for dmb instruction]) |
| 102 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ |
| 103 | int main() |
| 104 | { |
| 105 | asm volatile("dmb":::"memory"); |
| 106 | return 0; |
| 107 | } |
| 108 | ]]) |
| 109 | ],[ |
| 110 | AC_MSG_RESULT([yes]) |
| 111 | AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1]) |
| 112 | ],[ |
| 113 | AC_MSG_RESULT([no]) |
| 114 | ]) |
| 115 | ]) |
| 116 | |
| 117 | # Tile-specific checks |
| 118 | AS_IF([echo "$host_cpu" | grep "^tile"],[ |
| 119 | AC_MSG_CHECKING([for Tile architecture type]) |
| 120 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ |
| 121 | #ifndef __tilegx__ |
| 122 | #error |
| 123 | #endif |
| 124 | ]]) |
| 125 | ],[ |
| 126 | AC_MSG_RESULT([ok]) |
| 127 | ],[ |
| 128 | AC_MSG_FAILURE([URCU has only been tested on the TileGx architecture. For other Tile* architectures, please run the tests first and report the results to the maintainer so that proper support can be added.]) |
| 129 | ]) |
| 130 | ]) |
| 131 | |
| 132 | # x86-specific checks |
| 133 | AS_IF([test "x$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. |
| 138 | AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[ |
| 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 |
| 147 | AC_MSG_CHECKING([for sys_futex()]) |
| 148 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ |
| 149 | #include <sys/syscall.h> |
| 150 | #ifndef __NR_futex |
| 151 | #error "futexes not available" |
| 152 | #endif |
| 153 | ]]) |
| 154 | ],[ |
| 155 | AC_MSG_RESULT([yes]) |
| 156 | AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1]) |
| 157 | compat_futex_test=0 |
| 158 | ],[ |
| 159 | AC_MSG_RESULT([no]) |
| 160 | compat_futex_test=1 |
| 161 | ]) |
| 162 | |
| 163 | AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"]) |
| 164 | AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"]) |
| 165 | |
| 166 | # smp-support configure option |
| 167 | AC_ARG_ENABLE([smp-support], |
| 168 | AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]), |
| 169 | [def_smp_support=$enableval], |
| 170 | [def_smp_support="yes"]) |
| 171 | AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])]) |
| 172 | |
| 173 | |
| 174 | # From the sched_setaffinity(2)'s man page: |
| 175 | # ~~~~ |
| 176 | # The CPU affinity system calls were introduced in Linux kernel 2.5.8. |
| 177 | # The library interfaces were introduced in glibc 2.3. Initially, the |
| 178 | # glibc interfaces included a cpusetsize argument. In glibc 2.3.3, |
| 179 | # the cpuset size argument was removed, but this argument was |
| 180 | # restored in glibc 2.3.4. |
| 181 | # ~~~~ |
| 182 | |
| 183 | # In addition to that, some vendors ported the system call to 2.4 |
| 184 | # kernels. |
| 185 | |
| 186 | # Furthermore, when the function first appeared, the MASK argument was |
| 187 | # an unsigned long pointer, while later it was made into a cpu_set_t |
| 188 | # pointer. Systems that have the cpu_set_t version also should have |
| 189 | # the CPU_ZERO, CPU_SET, etc. macros. |
| 190 | |
| 191 | # All this mess means we have to cater for at least 3 different |
| 192 | # sched_setaffinity prototypes: |
| 193 | |
| 194 | # ~~~~ |
| 195 | # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask); |
| 196 | # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset); |
| 197 | # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask); |
| 198 | # ~~~~ |
| 199 | |
| 200 | # Since we define _GNU_SOURCE in the sources, must do so too in the |
| 201 | # autoconf tests, as defining _GNU_SOURCE or not exposes |
| 202 | # sched_setaffinity bits differently. |
| 203 | saved_CFLAGS=$CFLAGS |
| 204 | CFLAGS="$CFLAGS -D_GNU_SOURCE" |
| 205 | |
| 206 | AC_CHECK_TYPES([cpu_set_t], |
| 207 | [have_cpu_set_t="yes"], |
| 208 | [have_cpu_set_t="no"], |
| 209 | [#include <sched.h>]) |
| 210 | |
| 211 | # Confirm that we have CPU_ZERO, and it actually works. |
| 212 | AC_MSG_CHECKING([whether CPU_ZERO works]) |
| 213 | AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works]) |
| 214 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ |
| 215 | #define _GNU_SOURCE |
| 216 | #include <sched.h> |
| 217 | int main() |
| 218 | { |
| 219 | cpu_set_t foo; CPU_ZERO(&foo); |
| 220 | return 0; |
| 221 | } |
| 222 | ]]) |
| 223 | ],[ |
| 224 | AC_DEFINE(HAVE_CPU_ZERO, 1) |
| 225 | AC_MSG_RESULT([yes]) |
| 226 | ],[ |
| 227 | AC_MSG_RESULT([no]) |
| 228 | ]) |
| 229 | |
| 230 | # Confirm that we have CPU_SET, and it actually works. |
| 231 | AC_MSG_CHECKING([whether CPU_SET works]) |
| 232 | AH_TEMPLATE([HAVE_CPU_SET], [Defined to 1 if we have CPU_SET and it works]) |
| 233 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ |
| 234 | #define _GNU_SOURCE |
| 235 | #include <sched.h> |
| 236 | int main() |
| 237 | { |
| 238 | cpu_set_t foo, mask; CPU_SET(0, &foo); |
| 239 | return 0; |
| 240 | } |
| 241 | ]]) |
| 242 | ],[ |
| 243 | AC_DEFINE(HAVE_CPU_SET, 1) |
| 244 | AC_MSG_RESULT([yes]) |
| 245 | ],[ |
| 246 | AC_MSG_RESULT([no]) |
| 247 | ]) |
| 248 | |
| 249 | # First check if the function is available at all. |
| 250 | AC_CHECK_FUNCS([sched_setaffinity],[ |
| 251 | # Okay, we have it. Check if also have cpu_set_t. If we don't, |
| 252 | # then we have the first version using unsigned long, and no |
| 253 | # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the |
| 254 | # version with 2 or 3 arguments. In that case, CPU_ZERO, etc., |
| 255 | # should also be present, but we confirm nonetheless. |
| 256 | |
| 257 | AS_IF([test "x$have_cpu_set_t" = "xyes"], [ |
| 258 | # We do have it. |
| 259 | # Check how many arguments does sched_setaffinity take. |
| 260 | # Should be 3 or 2. |
| 261 | AC_MSG_CHECKING([how many arguments sched_setaffinity takes]) |
| 262 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ |
| 263 | #include <sched.h> |
| 264 | int main() |
| 265 | { |
| 266 | cpu_set_t foo; |
| 267 | sched_setaffinity(0, sizeof (foo), &foo); |
| 268 | return 0; |
| 269 | } |
| 270 | ]]) |
| 271 | ], |
| 272 | [sched_set_affinity_args=3], |
| 273 | [sched_set_affinity_args=2]) |
| 274 | AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, |
| 275 | $sched_set_affinity_args, |
| 276 | [Defined to sched_setaffinity's number of arguments.]) |
| 277 | AC_MSG_RESULT([$sched_set_affinity_args]) |
| 278 | ],[ |
| 279 | # No cpu_set_t, always 3 args. |
| 280 | AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) |
| 281 | ]) |
| 282 | ]) |
| 283 | |
| 284 | CFLAGS=$saved_CFLAGS |
| 285 | |
| 286 | AC_CONFIG_LINKS([ |
| 287 | urcu/arch.h:$ARCHSRC |
| 288 | urcu/uatomic.h:$UATOMICSRC |
| 289 | ]) |
| 290 | AC_CONFIG_FILES([ |
| 291 | Makefile |
| 292 | doc/Makefile |
| 293 | tests/Makefile |
| 294 | liburcu.pc |
| 295 | liburcu-bp.pc |
| 296 | liburcu-cds.pc |
| 297 | liburcu-qsbr.pc |
| 298 | liburcu-mb.pc |
| 299 | liburcu-signal.pc |
| 300 | ]) |
| 301 | AC_OUTPUT |
| 302 | |
| 303 | # Report on selected configure options |
| 304 | AS_IF([test "x$def_smp_support" = "xyes"],[ |
| 305 | AS_ECHO("SMP support enabled.") |
| 306 | ],[ |
| 307 | AS_ECHO("SMP support disabled.") |
| 308 | ]) |
| 309 | |
| 310 | AS_IF([test "x$def_tls_detect" = "x"],[ |
| 311 | AS_ECHO("Thread Local Storage (TLS): pthread_getspecific().") |
| 312 | ],[ |
| 313 | AS_ECHO("Thread Local Storage (TLS): $def_tls_detect.") |
| 314 | ]) |