1 dnl Check for presence of the Ragel State Machine generator.
3 dnl This macro checks for the presence of the ragel tool in the system,
4 dnl and whether the ragel tool is absolutely needed for a complete
7 dnl To check for the need for Ragel, you have to provide the relative
8 dnl path of a source file generated through Ragel: if the file is
9 dnl present in the source tree, a missing ragel command will not cause
10 dnl the configure to abort.
12 AC_DEFUN([_RAGEL_VARS], [
13 AC_ARG_VAR([RAGEL], [Ragel generator command])
14 AC_ARG_VAR([RAGELFLAGS], [Ragel generator flags])
17 AC_DEFUN([CHECK_RAGEL], [
18 AC_REQUIRE([_RAGEL_VARS])
19 AC_CHECK_PROG([RAGEL], [ragel], [ragel], [no])
21 dnl We set RAGEL to false so that it would execute the "false"
22 dnl command if needed.
23 AS_IF([test x"$RAGEL" = x"no"],
25 AS_IF([test x"$2" != "x"],
26 [ragel_version=`$RAGEL --version | sed -n -e '1s:.*version \(@<:@0-9@:>@\.@<:@0-9@:>@\) .*:\1:p'`
27 ragel_version_compare=`echo $ragel_version | tr -d .`
28 ragel_wanted_version=`echo $2 | tr -d .`
29 AS_IF([test $ragel_version_compare -lt $ragel_wanted_version],
30 [AC_MSG_WARN([Found Ragel $ragel_version but Ragel $2 requested])
35 dnl Only test the need if not found
36 AS_IF([test x"$RAGEL" = x"false"], [
37 AC_MSG_CHECKING([whether we need ragel to regenerate sources])
38 AS_IF([test -a "${srcdir}/$1"], [ragel_needed=no], [ragel_needed=yes])
39 AC_MSG_RESULT([$ragel_needed])
41 AS_IF([test x"$ragel_needed" = x"yes"],
43 You need Ragel to build from development sources.
44 You can find Ragel at http://www.complang.org/ragel/dnl
49 AC_DEFUN([CHECK_RAGEL_AM], [
50 CHECK_RAGEL([$1], [$2])
52 AM_CONDITIONAL([HAVE_RAGEL], [test x"$RAGEL" != x"false"])