configure: enable Lua if found and continue without if not

Search for Lua if no --enable-lua/--disable-lua specified but continue
without if not found.

If --enable-lua is specified and Lua is not found then return error.

If --disable-lua is specified, then don't search for Lua.

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

diff --git a/configure.ac b/configure.ac
index 481bf0627c72e296eeba03cd706cbbcb5e8522e0..4eaf329b0c3608b3690f19cf9fcdea825dc1fb8a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -174,29 +174,43 @@ m4_ifdef([PKG_CHECK_VAR], [],
 # Lua module and scripts
 AC_ARG_ENABLE([lua],
        [AC_HELP_STRING([--enable-lua], [enable lua binding])],
-       [enable_lua=yes], [enable_lua=no])
+       [], [enable_lua=check])
 
 AC_ARG_WITH([lua-pc],
        [AS_HELP_STRING(
                [--with-lua-pc=PKG],
                [Specify pkg-config package name for lua]
-       )],
-       [LUAPKGCONFIG=$with_lua_pc
-       enable_lua=yes])
+       )], [], [with_lua_pc=no])
+
+if test "x$enable_lua" = "xyes" -a "x$with_lua_pc" != "xno"; then
+       # exit with error if not found
+       PKG_CHECK_MODULES([LUA], [$with_lua_pc], [LUAPKGCONFIG=$with_lua_pc])
+fi
+
+if test "x$enable_lua" = "xcheck" -a "x$with_lua_pc" != "xno"; then
+       PKG_CHECK_MODULES([LUA], [$with_lua_pc],
+               [LUAPKGCONFIG=$with_lua_pc
+               enable_lua=yes],
+               [enable_lua=no])
+fi
+
+if test "x$enable_lua" != "xno"; then
+       PKG_CHECK_MODULES([LUA], [lua], [LUAPKGCONFIG=lua],
+               [PKG_CHECK_MODULES([LUA], [lua5.2], [LUAPKGCONFIG=lua5.2],
+                       [PKG_CHECK_MODULES([LUA], [lua5.1], [LUAPKGCONFIG=lua5.1],
+                               [AS_IF([test "x$enable_lua" = "xyes"],
+                                       [AC_MSG_ERROR([Lua not found. Please use --with-lua-pc=PKG])],
+                                       [enable_lua=no])]
+                       )]
+               )])
+       AS_IF([test "x$LUAPKGCONFIG" != "x"], [enable_lua=yes])
+fi
 
 AM_CONDITIONAL([ENABLE_LUA],
        [test "x$enable_lua" = "xyes"])
 
 AM_COND_IF([ENABLE_LUA],
-       [AS_IF([test "x$with_lua_pc" = "xyes"],
-               [PKG_CHECK_MODULES([LUA], [lua],[LUAPKGCONFIG=lua],
-                       [PKG_CHECK_MODULES([LUA], [lua5.2],[LUAPKGCONFIG=lua5.2],
-                               [PKG_CHECK_MODULES([LUA], [lua5.1],
-                                       [LUAPKGCONFIG=lua5.1])]
-                       )]
-               )],
-               [PKG_CHECK_MODULES([LUA], [$with_lua_pc])])
-       AC_MSG_CHECKING([Lua version])
+       [AC_MSG_CHECKING([Lua version])
        PKG_CHECK_VAR([LUA_VERSION], [$LUAPKGCONFIG], [V],,
                [PKG_CHECK_VAR([LUA_VERSION], [$LUAPKGCONFIG], [major_version])])
        AC_MSG_RESULT([$LUA_VERSION])