+AC_MSG_CHECKING([if big-arrays are to be enabled])
+AC_ARG_ENABLE(big-arrays, [ --enable-big-arrays Enable the allocation and indexing of arrays greater than Int32.MaxValue], enable_big_arrays=$enableval, enable_big_arrays=no)
+AC_MSG_RESULT($enable_big_arrays)
+if test "x$enable_big_arrays" = "xyes" ; then
+ AC_DEFINE(MONO_BIG_ARRAYS,1,[Enable the allocation and indexing of arrays greater than Int32.MaxValue])
+fi
+
+dnl **************
+dnl *** DTRACE ***
+dnl **************
+
+AC_ARG_ENABLE(dtrace,[ --enable-dtrace Enable DTrace probes], enable_dtrace=$enableval, enable_dtrace=$has_dtrace)
+
+if test "x$enable_dtrace" = "xyes"; then
+ if test "x$has_dtrace" = "xno"; then
+ AC_MSG_ERROR([DTrace probes are not supported on this platform.])
+ fi
+ AC_PATH_PROG(DTRACE, [dtrace], [no], [$PATH:/usr/sbin])
+ if test "x$DTRACE" = "xno"; then
+ AC_MSG_RESULT([dtrace utility not found, dtrace support disabled.])
+ enable_dtrace=no
+ fi
+fi
+
+dtrace_g=no
+if test "x$enable_dtrace" = "xyes"; then
+ AC_DEFINE(ENABLE_DTRACE, 1, [Enable DTrace probes])
+ DTRACEFLAGS=
+ if test "x$ac_cv_sizeof_void_p" = "x8"; then
+ case "$host" in
+ powerpc-*-darwin*)
+ DTRACEFLAGS="-arch ppc64"
+ ;;
+ i*86-*-darwin*)
+ DTRACEFLAGS="-arch x86_64"
+ ;;
+ *)
+ DTRACEFLAGS=-64
+ ;;
+ esac
+ else
+ case "$host" in
+ powerpc-*-darwin*)
+ DTRACEFLAGS="-arch ppc"
+ ;;
+ i*86-*-darwin*)
+ DTRACEFLAGS="-arch i386"
+ ;;
+ *)
+ DTRACEFLAGS=-32
+ ;;
+ esac
+ fi
+ AC_SUBST(DTRACEFLAGS)
+ case "$host" in
+ *-*-solaris*)
+ dtrace_g=yes
+ ;;
+ esac
+ AC_CHECK_HEADERS([sys/sdt.h])
+fi
+AM_CONDITIONAL(ENABLE_DTRACE, [test x$enable_dtrace = xyes])
+AM_CONDITIONAL(DTRACE_G_REQUIRED, [test x$dtrace_g = xyes])
+