+
+# Set os specific options
+AS_CASE([$host_os],
+ [freebsd*], [NO_NUMA=1]
+)
+
+# Configuration options, which will be installed in the config.h
+AH_TEMPLATE([LTTNG_UST_HAVE_EFFICIENT_UNALIGNED_ACCESS], [Use efficient unaligned access.])
+AH_TEMPLATE([LTTNG_UST_HAVE_SDT_INTEGRATION], [SystemTap integration via sdt.h])
+AH_TEMPLATE([LTTNG_UST_HAVE_PERF_EVENT], [Perf event integration via perf_event.h])
+
+# Checks for libraries.
+AC_CHECK_LIB([dl], [dlopen], [
+ libdl_name=dl
+ DL_LIBS="-ldl"
+], [
+ #libdl not found, check for dlopen in libc.
+ AC_CHECK_LIB([c], [dlopen], [
+ libdl_name=c
+ DL_LIBS="-lc"
+ ], [
+ AC_MSG_ERROR([Cannot find dlopen in libdl nor libc. Use [LDFLAGS]=-Ldir to specify their location.])
+ ])
+])
+AC_SUBST(DL_LIBS)
+
+# Check if libdl has dlmopen support.
+AH_TEMPLATE([HAVE_DLMOPEN], ["Define to 1 if dlmopen is available."])
+AC_CHECK_LIB([$libdl_name], [dlmopen],
+ [AC_DEFINE([HAVE_DLMOPEN], [1])]
+)
+
+# Check for dlfcn.h
+AC_CHECK_HEADER([dlfcn.h])
+AS_IF([test "x${ac_cv_header_dlfcn_h}" = "xyes"], [
+ AC_CHECK_DECLS([RTLD_DI_LINKMAP], [], [], [
+ #include <dlfcn.h>
+ ])
+], [
+ ac_cv_have_decl_RTLD_DI_LINKMAP="no"
+])
+
+AM_CONDITIONAL([HAVE_DLINFO], [test "x${ac_cv_have_decl_RTLD_DI_LINKMAP}" = "xyes"])
+
+# Require URCU >= 0.12 for DEFINE_URCU_TLS_INIT
+PKG_CHECK_MODULES([URCU], [liburcu >= 0.12])
+
+# numa.h integration
+AS_IF([test "x$NO_NUMA" = "x1"],[
+ AS_IF([test "x$enable_numa" = "x" ], [enable_numa=no])
+])
+
+AC_ARG_ENABLE([numa], [
+AS_HELP_STRING([--disable-numa], [disable NUMA support])
+], [
+ enable_numa=$enableval
+], [
+ enable_numa=yes
+])
+
+AS_IF([test "x$enable_numa" = "xyes"], [
+ # numa - check that numa lib is available
+ AC_CHECK_LIB([numa], [numa_available], [],
+[AC_MSG_ERROR([libnuma is not available. Please either install it (e.g. libnuma-dev) or use [LDFLAGS]=-Ldir to specify the right location, or use --disable-numa configure argument to disable NUMA support.])])
+ have_libnuma=yes
+])
+AM_CONDITIONAL([HAVE_LIBNUMA], [test "x$have_libnuma" = "xyes"])
+
+# optional linux/perf_event.h
+AC_CHECK_HEADERS([linux/perf_event.h], [have_perf_event=yes], [])
+
+# Perf event counters are supported on all architectures supported by
+# perf, using the read system call as fallback.
+AM_CONDITIONAL([HAVE_PERF_EVENT], [test "x$have_perf_event" = "xyes"])
+
+AS_IF([test "x$have_perf_event" = "xyes"], [
+ AC_DEFINE([LTTNG_UST_HAVE_PERF_EVENT], [1])
+])