# -*- Autoconf -*- # Process this file with autoconf to produce a configure script. AC_INIT([userspace-rcu],[0.6.7],[mathieu dot desnoyers at efficios dot com]) # Following the numbering scheme proposed by libtool for the library version # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html AC_SUBST([URCU_LIBRARY_VERSION], [1:0:0]) AC_CONFIG_AUX_DIR([config]) AC_CONFIG_MACRO_DIR([config]) AC_CANONICAL_TARGET AC_CANONICAL_HOST AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip]) m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])]) AC_CONFIG_SRCDIR([urcu.h]) AC_CONFIG_HEADERS([config.h urcu/config.h]) 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.]) AH_TEMPLATE([CONFIG_RCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.]) AH_TEMPLATE([CONFIG_RCU_HAVE_FUTEX], [Defined when on a system with futex support.]) AH_TEMPLATE([CONFIG_RCU_COMPAT_ARCH], [Compatibility mode for i386 which lacks cmpxchg instruction.]) AH_TEMPLATE([CONFIG_RCU_ARM_HAVE_DMB], [Use the dmb instruction if available for use on ARM.]) # Checks for programs. AC_PROG_CC AC_PROG_MAKE_SET LT_INIT # Checks for typedefs, structures, and compiler characteristics. AC_C_INLINE AC_TYPE_PID_T AC_TYPE_SIZE_T # Checks for library functions. AC_FUNC_MALLOC AC_FUNC_MMAP AC_CHECK_FUNCS([bzero gettimeofday munmap sched_getcpu strtoul sysconf]) # Find arch type AS_CASE([$host_cpu], [i386], [ARCHTYPE="x86" && SUBARCHTYPE="x86compat"], [i486], [ARCHTYPE="x86"], [i586], [ARCHTYPE="x86"], [i686], [ARCHTYPE="x86"], [amd64], [ARCHTYPE="x86"], [x86_64], [ARCHTYPE="x86"], [powerpc], [ARCHTYPE="ppc"], [ppc64], [ARCHTYPE="ppc"], [powerpc64], [ARCHTYPE="ppc"], [ppc], [ARCHTYPE="ppc"], [s390], [ARCHTYPE="s390"], [s390x], [ARCHTYPE="s390"], [sparc64], [ARCHTYPE="sparc64"], [alpha*], [ARCHTYPE="alpha"], [ia64], [ARCHTYPE="gcc"], [arm*], [ARCHTYPE="arm"], [ARCHTYPE="unknown"] ) AC_SUBST(ARCHTYPE) AC_SUBST(SUBARCHTYPE) UATOMICSRC=urcu/uatomic/$ARCHTYPE.h ARCHSRC=urcu/arch/$ARCHTYPE.h AS_IF([test "x$SUBARCHTYPE" = xx86compat],[ AC_DEFINE([CONFIG_RCU_COMPAT_ARCH], [1]) ]) AS_IF([test "$host_cpu" = "armv7l"],[ CFLAGS="$CFLAGS -mcpu=cortex-a9 -mtune=cortex-a9 -O1" ]) # ARM-specific checks AS_IF([test "x$ARCHTYPE" = "xarm"],[ AC_MSG_CHECKING([for dmb instruction]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[asm volatile("dmb":::"memory");]])],[ AC_MSG_RESULT([yes]) AC_DEFINE([CONFIG_RCU_ARM_HAVE_DMB], [1]) ],[ AC_MSG_RESULT([no]) ]) ]) # x86-specific checks AS_IF([test "x$ARCHTYPE" = "xx86"],[ AC_MSG_CHECKING([if architecture really supports the mfence instruction]) #For now, using lock; addl compatibility mode even for i686, because the #Pentium III is seen as a i686, but lacks mfence instruction. #Only using fence for x86_64. AS_IF([test "x$host_cpu" != "xi386" -a "x$host_cpu" != "xi486" -a "x$host_cpu" != "xi586" -a "x$host_cpu" != "xi686"],[ AC_MSG_RESULT([yes]) AC_DEFINE([CONFIG_RCU_HAVE_FENCE], [1]) ],[ AC_MSG_RESULT([no]) ]) ]) # Check if sys_futex() is available AC_MSG_CHECKING([for sys_futex()]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include ]],[[ #ifndef __NR_futex #error "futexes not available" #endif ]]) ],[ AC_MSG_RESULT([yes]) AC_DEFINE([CONFIG_RCU_HAVE_FUTEX], [1]) compat_futex_test=0 ],[ AC_MSG_RESULT([no]) compat_futex_test=1 ]) AM_CONDITIONAL([COMPAT_FUTEX], [test "x$compat_futex_test" = "x1"]) AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = "xx86compat"]) # smp-support configure option AC_ARG_ENABLE([smp-support], AS_HELP_STRING([--disable-smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems. [default=enabled]]), [def_smp_support=$enableval], [def_smp_support="yes"]) AS_IF([test "x$def_smp_support" = "xyes"], [AC_DEFINE([CONFIG_RCU_SMP], [1])]) # From the sched_setaffinity(2)'s man page: # ~~~~ # The CPU affinity system calls were introduced in Linux kernel 2.5.8. # The library interfaces were introduced in glibc 2.3. Initially, the # glibc interfaces included a cpusetsize argument. In glibc 2.3.3, # the cpuset size argument was removed, but this argument was # restored in glibc 2.3.4. # ~~~~ # In addition to that, some vendors ported the system call to 2.4 # kernels. # Furthermore, when the function first appeared, the MASK argument was # an unsigned long pointer, while later it was made into a cpu_set_t # pointer. Systems that have the cpu_set_t version also should have # the CPU_ZERO, CPU_SET, etc. macros. # All this mess means we have to cater for at least 3 different # sched_setaffinity prototypes: # ~~~~ # int sched_setaffinity (pid_t pid, unsigned int len, unsigned long *mask); # int sched_setaffinity (pid_t __pid, size_t __cpusetsize, const cpu_set_t *__cpuset); # int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask); # ~~~~ # Since we define _GNU_SOURCE in the sources, must do so too in the # autoconf tests, as defining _GNU_SOURCE or not exposes # sched_setaffinity bits differently. saved_CFLAGS=$CFLAGS CFLAGS="$CFLAGS -D_GNU_SOURCE" # First check if the function is available at all. AC_CHECK_FUNCS([sched_setaffinity],[ # Okay, we have it. Check if also have cpu_set_t. If we don't, # then we have the first version using unsigned long, and no # CPU_ZERO, etc. macros. If we do have cpu_set_t, we may have the # version with 2 or 3 arguments. In that case, CPU_ZERO, etc., # should also be present, but we confirm nonetheless. AC_CHECK_TYPES([cpu_set_t],[ # We do have it. Confirm that we have CPU_ZERO, and it actually works. AC_MSG_CHECKING([whether CPU_ZERO works]) AH_TEMPLATE([HAVE_CPU_ZERO], [Defined to 1 if we have CPU_ZERO and it works]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #define _GNU_SOURCE #include ]],[[ cpu_set_t foo; CPU_ZERO (&foo); ]]) ],[ # Works! AC_DEFINE(HAVE_CPU_ZERO, 1) AC_MSG_RESULT([yes]) ],[ AC_MSG_RESULT([no]) ]) # Check how many arguments does sched_setaffinity take. # Should be 3 or 2. AC_MSG_CHECKING([how many arguments sched_setaffinity takes]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include ]],[[ cpu_set_t foo; sched_setaffinity (0, sizeof (foo), &foo); ]]) ], [sched_set_affinity_args=3], [sched_set_affinity_args=2]) AC_DEFINE_UNQUOTED(SCHED_SETAFFINITY_ARGS, $sched_set_affinity_args, [Defined to sched_setaffinity's number of arguments.]) AC_MSG_RESULT([$sched_set_affinity_args]) ],[ # No cpu_set_t, always 3 args. AC_DEFINE(SCHED_SETAFFINITY_ARGS, 3) ], [#include ]) ]) CFLAGS=$saved_CFLAGS AC_CONFIG_LINKS([ urcu/arch.h:$ARCHSRC urcu/uatomic.h:$UATOMICSRC ]) AC_CONFIG_FILES([ Makefile tests/Makefile liburcu.pc liburcu-bp.pc liburcu-cds.pc liburcu-qsbr.pc liburcu-mb.pc liburcu-signal.pc ]) AC_OUTPUT # Report on selected configure options AS_IF([test "x$def_smp_support" = "xyes"],[ AS_ECHO("SMP support enabled.") ],[ AS_ECHO("SMP support disabled.") ])