-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"
-
-AC_CHECK_TYPES([cpu_set_t],
- [have_cpu_set_t="yes"],
- [have_cpu_set_t="no"],
- [#include <sched.h>])
-
-# 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_SOURCE([[
- #define _GNU_SOURCE
- #include <sched.h>
- int main()
- {
- cpu_set_t foo; CPU_ZERO(&foo);
- return 0;
- }
- ]])
-],[
- AC_DEFINE(HAVE_CPU_ZERO, 1)
- AC_MSG_RESULT([yes])
-],[
- AC_MSG_RESULT([no])
+# Enabled by default
+AE_FEATURE_DEFAULT_ENABLE
+AE_FEATURE([smp-support], [Disable SMP support. Warning: only use this on uniprocessor systems.])
+
+# RCU debugging option
+# Disabled by default
+AE_FEATURE_DEFAULT_DISABLE
+AE_FEATURE([rcu-debug], [Enable internal debugging self-checks. Introduces a performance penalty.])
+
+# rculfhash iterator debugging
+# Disabled by default
+AE_FEATURE_DEFAULT_DISABLE
+AE_FEATURE([cds-lfht-iter-debug], [Enable extra debugging checks for lock-free hash table iterator traversal. Alters the rculfhash ABI. Make sure to compile both library and application with matching configuration.])
+
+# When given, add -Werror to WARN_CFLAGS and WARN_CXXFLAGS.
+# Disabled by default
+AE_FEATURE_DEFAULT_DISABLE
+AE_FEATURE([Werror],[Treat compiler warnings as errors.])
+
+## ##
+## Set defines for optional features conditionnals in the source code ##
+## ##
+
+AE_IF_FEATURE_DISABLED([sys-membarrier-fallback], [
+ AC_DEFINE([CONFIG_RCU_FORCE_SYS_MEMBARRIER], [1], [Require the operating system to support the membarrier system call for default and bulletproof flavors.])