Automake support for Ragel from Flameeyes.

git-svn-id: http://svn.complang.org/ragel/trunk@779 052ea7fc-9027-0410-9066-f65837a77df0

diff --git a/contrib/ragel.m4 b/contrib/ragel.m4
new file mode 100644 (file)
index 0000000..8b9b913
--- /dev/null
+++ b/contrib/ragel.m4
@@ -0,0 +1,43 @@
+dnl Check for presence of the Ragel State Machine generator.
+dnl
+dnl This macro checks for the presence of the ragel tool in the system,
+dnl and whether the ragel tool is absolutely needed for a complete
+dnl build.
+dnl
+dnl To check for the need for Ragel, you have to provide the relative
+dnl path of a source file generated through Ragel: if the file is
+dnl present in the source tree, a missing ragel command will not cause
+dnl the configure to abort.
+
+AC_DEFUN([_RAGEL_VARS], [
+  AC_ARG_VAR([RAGEL], [Ragel generator command])
+  AC_ARG_VAR([RAGELFLAGS], [Ragel generator flags])
+])
+
+AC_DEFUN([CHECK_RAGEL], [
+  AC_REQUIRE([_RAGEL_VARS])
+  AC_CHECK_PROG([RAGEL], [ragel], [ragel], [no])
+
+  dnl We set RAGEL to false so that it would execute the "false"
+  dnl command if needed.
+  AS_IF([test x"$RAGEL" = x"no"], [RAGEL=false])
+
+  dnl Only test the need if not found
+  AS_IF([test x"$RAGEL" = x"false"], [
+    AC_MSG_CHECKING([whether we need ragel to regenerate sources])
+    AS_IF([test -a ${srcdir}/$1], [ragel_needed=no], [ragel_needed=yes])
+    AC_MSG_RESULT([$ragel_needed])
+
+    AS_IF([test x"$ragel_needed" = x"yes"],
+      [AC_MSG_ERROR([dnl
+You need Ragel to build from GIT checkouts.
+You can find Ragel at http://www.complang.org/ragel/dnl
+      ])])
+  ])
+])
+
+AC_DEFUN([CHECK_RAGEL_AM], [
+  CHECK_RAGEL([$1])
+
+  AM_CONDITIONAL([HAVE_RAGEL], [test x"$RAGEL" != x"false"])
+])

diff --git a/contrib/ragel.make b/contrib/ragel.make
new file mode 100644 (file)
index 0000000..f7a71b5
--- /dev/null
+++ b/contrib/ragel.make
@@ -0,0 +1,6 @@
+# -*- Makefile -*-\r
+\r
+SUFFIXES = .rl\r
+\r
+.rl.c:\r
+       $(RAGEL) $(RAGELFLAGS) -C $< -o $@\r