Add utrace(2)-based tracing (--enable-utrace).
diff --git a/configure.ac b/configure.ac
index 16f0378..8e94b5c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -699,6 +699,34 @@
fi
AC_SUBST([enable_fill])
+dnl Disable utrace(2)-based tracing by default.
+AC_ARG_ENABLE([utrace],
+ [AS_HELP_STRING([--enable-utrace], [Enable utrace(2)-based tracing])],
+[if test "x$enable_utrace" = "xno" ; then
+ enable_utrace="0"
+else
+ enable_utrace="1"
+fi
+],
+[enable_utrace="0"]
+)
+JE_COMPILABLE([utrace(2)], [
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <sys/ktrace.h>
+], [
+ utrace((void *)0, 0);
+], [je_cv_utrace])
+if test "x${je_cv_utrace}" = "xno" ; then
+ enable_utrace="0"
+fi
+if test "x$enable_utrace" = "x1" ; then
+ AC_DEFINE([JEMALLOC_UTRACE], [ ])
+fi
+AC_SUBST([enable_utrace])
+
dnl Do not support the xmalloc option by default.
AC_ARG_ENABLE([xmalloc],
[AS_HELP_STRING([--enable-xmalloc], [Support xmalloc option])],
@@ -1061,6 +1089,7 @@
AC_MSG_RESULT([tcache : ${enable_tcache}])
AC_MSG_RESULT([fill : ${enable_fill}])
AC_MSG_RESULT([xmalloc : ${enable_xmalloc}])
+AC_MSG_RESULT([utrace : ${enable_utrace}])
AC_MSG_RESULT([dss : ${enable_dss}])
AC_MSG_RESULT([lazy_lock : ${enable_lazy_lock}])
AC_MSG_RESULT([tls : ${enable_tls}])