-AC_ARG_ENABLE(kmod,
- AS_HELP_STRING([--disable-kmod],[build without kmod support]),
- kmod_support=zz$enableval, kmod_support=yes)
-
-AS_IF([test "x$kmod_support" = "xyes"], [
- AC_CHECK_LIB([kmod], [kmod_module_probe_insert_module],
- [
- AC_DEFINE([HAVE_KMOD], [1], [has kmod support])
- LIBS="$LIBS -lkmod"
- kmod_found=yes
- ],
- kmod_found=no
- )
-])
-AM_CONDITIONAL([HAVE_KMOD], [test "x$kmod_found" = xyes])
+# Check for libkmod, it will be auto-neabled if found but won't fail if it's not,
+# it can be explicitly disabled with --without-kmod
+AH_TEMPLATE([HAVE_KMOD], [Define if you have kmod support])
+AC_ARG_WITH([kmod],
+ [AS_HELP_STRING([--with-kmod], [build with lkmod support @<:@default=check@:>@])],
+ [],
+ [with_kmod=check]
+)
+
+AS_IF([test "x$with_kmod" != "xno"],
+ [
+ AC_CHECK_LIB([kmod], [kmod_module_probe_insert_module],
+ [
+ AC_DEFINE([HAVE_KMOD], [1])
+ KMOD_LIBS="-lkmod"
+ ],
+ [
+ if test "x$with_kmod" != xcheck; then
+ AC_MSG_FAILURE([Cannot find libkmod. Use [LDFLAGS]=-Ldir and [CPPFLAGS]=-Idir to specify its location.])
+ else
+ with_kmod=no
+ fi
+ ]
+ )
+ ]
+)
+AC_SUBST(KMOD_LIBS)
+
+# Check for liblttng-ust-ctl, fail if it's not found,
+# it can be explicitly disabled with --without-lttng-ust
+AH_TEMPLATE([HAVE_LIBLTTNG_UST_CTL], [Define if you have LTTng-UST control support])
+AC_ARG_WITH([lttng-ust],
+ [AS_HELP_STRING([--without-lttng-ust], [build without LTTng-UST (Userspace Tracing) support])],
+ [],
+ [with_lttng_ust=yes]
+)
+
+AS_IF([test "x$with_lttng_ust" = "xyes"],
+ [
+ AC_CHECK_LIB([lttng-ust-ctl], [ustctl_recv_channel_from_consumer],
+ [
+ AC_DEFINE([HAVE_LIBLTTNG_UST_CTL], [1])
+ ],
+ [
+ AC_MSG_FAILURE([Cannot find LTTng-UST >= 2.2.x. Use [LDFLAGS]=-Ldir and [CPPFLAGS]=-Idir to specify its location, or specify --without-lttng-ust to build lttng-tools without LTTng-UST support.])
+ ],
+ [-lurcu-common -lurcu-bp -lurcu-cds -lrt -ldl]
+ )
+ ]
+)
+AM_CONDITIONAL([HAVE_LIBLTTNG_UST_CTL], [test "x$with_lttng_ust" = "xyes"])