X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=configure.ac;h=be9fd72b499b7e9fef75d02da51ce01f93a8bbae;hp=40603c41f6452171de1b159f9e736eafdcba9d2d;hb=49617de1d80d771ac9a1d45b1710b16fac65e0aa;hpb=79da867ed182157b0353011b2947e87185c2fa60

diff --git a/configure.ac b/configure.ac
index 40603c4..be9fd72 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,10 +9,10 @@ AC_CANONICAL_HOST
 AM_INIT_AUTOMAKE([foreign dist-bzip2 no-dist-gzip])
 AC_CONFIG_SRCDIR([urcu.h])
 
-AH_TEMPLATE([CONFIG_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_HAVE_FENCE], [Defined when on a system that has memory fence
-instructions.])
-AC_CONFIG_HEADERS([config.h])
+AH_TEMPLATE([CONFIG_URCU_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_URCU_HAVE_FENCE], [Defined when on a system that has memory fence instructions.])
+AH_TEMPLATE([CONFIG_URCU_HAVE_FUTEX], [Defined when on a system with futex support.])
+AC_CONFIG_HEADERS([urcu/config.h])
 
 # Checks for programs.
 AC_PROG_CC
@@ -54,14 +54,38 @@ AC_SUBST(SUBARCHTYPE)
 [
 if test "x$ARCHTYPE" = "xx86" -a "x$target_cpu" != "xi386" -a "x$target_cpu" != "xi486" -a "x$target_cpu" != "xi586"; then
 ]
-	AC_DEFINE([CONFIG_HAVE_FENCE], [1])
+	AC_DEFINE([CONFIG_URCU_HAVE_FENCE], [1])
 [
 fi
 ]
 
+AC_MSG_CHECKING([sys_futex()])
+AC_TRY_COMPILE(
+[
+#include <sys/syscall.h>
+],
+[
+#ifndef __NR_futex
+#error "futexes not available"
+#endif
+],
+[
+	AC_MSG_RESULT([yes])
+	AC_DEFINE([CONFIG_URCU_HAVE_FUTEX], [1])
+	compat_futex_test=0
+]
+,
+[
+	AC_MSG_RESULT([no])
+	compat_futex_test=1
+]
+)
+
+AM_CONDITIONAL([COMPAT_FUTEX], [ test "x$compat_futex_test" = "x1" ])
+
 AM_CONDITIONAL([GCC_API], [test "x$ARCHTYPE" != xx86 -a "x$ARCHTYPE" != xppc])
 
-AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" == xx86compat ])
+AM_CONDITIONAL([COMPAT_ARCH], [test "x$SUBARCHTYPE" = xx86compat ])
 
 AC_ARG_ENABLE([smp-support], [  --disable-smp-support   Disable SMP support. Warning: only use this
                           on uniprocessor systems. [[default=enabled]]], [def_smp_support=$enableval], [def_smp_support="yes"])
@@ -71,7 +95,7 @@ if test "$def_smp_support" = "no"; then
 	echo "SMP support disabled."
 else
 ]
-	AC_DEFINE([CONFIG_SMP], [1])
+	AC_DEFINE([CONFIG_URCU_SMP], [1])
 [
 	echo "SMP support enabled."
 fi