1 files changed, 62 insertions, 0 deletions
diff --git a/m4/pdns_with_lua.m4 b/m4/pdns_with_lua.m4
new file mode 100644
index 0000000..e280c1b
--- /dev/null
+++ b/m4/pdns_with_lua.m4
@@ -0,0 +1,62 @@
+AC_DEFUN([PDNS_WITH_LUA],[
+  AC_PROG_GREP()dnl Ensure we have grep
+  AC_MSG_CHECKING([which Lua implementation to use])
+  AC_ARG_WITH([lua],
+    [AS_HELP_STRING([--with-lua], [select Lua implementation @<:@default=auto@:>@])
+  ], [
+    with_lua=$withval
+  ], [
+    with_lua=auto
+  ])
+
+  AS_IF([test "x$with_lua" = "xyes"], [
+    dnl --with-lua was passed, make it auto
+    with_lua=auto
+  ])
+
+  AC_MSG_RESULT([$with_lua])
+
+  AS_IF([test "x$with_lua" = "xno" -a "$1" = "mandatory"], [
+    AC_MSG_ERROR([--without-lua specified, but Lua is not optional])
+  ])
+
+  LUAPC=""
+  luajit_min_version='2.0.2'
+  lua_min_version='5.1'
+
+  AS_IF([test "x$with_lua" != "xno"], [
+    AS_IF([test "x$with_lua" != "xauto"], [
+      with_lua_version=${lua_min_version}
+      AS_IF([echo "x$with_lua" | ${GREP} 'jit' >/dev/null 2>&1], [with_lua_version=${luajit_min_version}])
+      PKG_CHECK_MODULES([LUA], $with_lua >= $with_lua_version, [
+        AC_DEFINE([HAVE_LUA], [1], [Define to 1 if you have Lua])
+        LUAPC=$with_lua
+      ], [
+        AC_MSG_ERROR([Selected Lua ($with_lua) not found])
+      ])
+    ], [
+      PKG_CHECK_MODULES([LUA], [luajit >= ${luajit_min_version}], [
+        LUAPC=luajit
+        AC_DEFINE([HAVE_LUA], [1], [Define to 1 if you have Lua])
+      ], [ : ])
+      AS_IF([test -z "$LUAPC"], [
+        found_lua=n
+        m4_foreach_w([luapc], [lua5.3 lua-5.3 lua53 lua5.2 lua-5.2 lua52 lua5.1 lua-5.1 lua51 lua], [
+          AS_IF([test "$found_lua" != "y"], [
+            PKG_CHECK_MODULES([LUA], [luapc >= ${lua_min_version}], [
+              AC_DEFINE([HAVE_LUA], [1], [Define to 1 if you have lua])
+              found_lua=y
+              LUAPC=luapc
+            ], [ : ])
+          ])
+        ])
+      ])
+    ])
+  ])
+
+  AS_IF([test -z "$LUAPC" -a "$1" = "mandatory"], [
+    AC_MSG_ERROR([No Lua not found, but is mandatory])
+  ])
+
+  AM_CONDITIONAL([LUA], [test -n "x$LUAPC"])
+])