Fix not NULL pointer on size 0

[lttng-tools.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 3ead48e7b8344f06df61566f9d1e1a8cdf7bf60c..cd1e0d152f6d6b16214eb84e536c442bc38a8a76 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -8,17 +8,12 @@ AM_SILENT_RULES([yes])
 
 AC_CONFIG_HEADERS([include/config.h])
 
-AH_TEMPLATE([CONFIG_LTTNG_TOOLS_HAVE_UST], [Defined on systems where UST headers can be found.])
-
 AC_CHECK_HEADERS([ \
        sys/types.h unistd.h fcntl.h string.h pthread.h limits.h \
        signal.h stdlib.h sys/un.h sys/socket.h stdlib.h stdio.h \
        getopt.h sys/ipc.h sys/shm.h popt.h grp.h \
 ])
 
-# URCU library version needed or newer
-liburcu_version=">= 0.6.5"
-
 # Check for pthread
 AC_CHECK_LIB([pthread], [pthread_create], [],
        [AC_MSG_ERROR([Cannot find libpthread. Use [LDFLAGS]=-Ldir to specify its location.])]
@@ -29,6 +24,9 @@ AC_CHECK_LIB([popt], [poptGetContext], [],
        [AC_MSG_ERROR([Cannot find libpopt. Use [LDFLAGS]=-Ldir to specify its location.])]
 )
 
+# URCU library version needed or newer
+liburcu_version=">= 0.6.6"
+
 # Check liburcu needed function calls
 AC_CHECK_DECL([cds_list_add], [],
        [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu/list.h>]]
@@ -36,6 +34,9 @@ AC_CHECK_DECL([cds_list_add], [],
 AC_CHECK_DECL([cds_wfq_init], [],
        [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu/wfqueue.h>]]
 )
+AC_CHECK_DECL([cds_wfq_dequeue_blocking], [],
+    [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu/wfqueue.h>]]
+)
 AC_CHECK_DECL([futex_async], [],
        [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu/futex.h>]]
 )
@@ -45,19 +46,29 @@ AC_CHECK_DECL([rcu_thread_offline], [],
 AC_CHECK_DECL([rcu_thread_online], [],
        [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu.h>]]
 )
-AC_CHECK_DECL([ustctl_create_session],
-       [
-               AC_DEFINE([CONFIG_LTTNG_TOOLS_HAVE_UST], 1)
-               have_ust_test=1
-       ],
-       [
-               AC_MSG_WARN([UST header not found. Building without UST support.])
-               have_ust_test=0
-       ],
-       [[#include <ust/lttng-ust-ctl.h>]]
+AC_CHECK_DECL([caa_likely], [],
+       [AC_MSG_ERROR([liburcu $liburcu_version or newer is needed])], [[#include <urcu.h>]]
 )
 
-AM_CONDITIONAL([LTTNG_TOOLS_HAVE_UST], [ test "x$have_ust_test" = "x1" ])
+# Check liblttng-ust-ctl library
+AC_ARG_ENABLE(lttng-ust,
+       [  --disable-lttng-ust     build without LTTng-UST (Userspace Tracing) support.],
+       lttng_ust_support=no, lttng_ust_support=yes)
+
+[
+if test "x$lttng_ust_support" = "xno"; then
+       echo "LTTng-UST support disabled."
+else
+]
+       AC_CHECK_LIB([lttng-ust-ctl], [ustctl_create_session], [],
+               [AC_MSG_ERROR([Cannot find LTTng-UST. Use [LDFLAGS]=-Ldir to specify its location, or specify --disable-lttng-ust to build lttng-tools without LTTng-UST support.])]
+       )
+[
+       echo "LTTng-UST support enabled."
+fi
+]
+
+AM_CONDITIONAL([HAVE_LIBLTTNG_UST_CTL], [ test "x$ac_cv_lib_lttng_ust_ctl_ustctl_create_session" = "xyes" ])
 
 AC_CHECK_FUNCS([sched_getcpu sysconf])