Re: Availability of 5.2-compatible libraries

[steve donovan <steve.j.donovan@...>]

On Wed, Jan 18, 2012 at 6:33 AM, Rob Kendrick <rjek@rjek.com> wrote:
> I've seen threads mention ways of getting things to build for 5.2: is
> there an automated way of forcing these changes yet?  (ie, a header to
> include, etc) or must it be done manually for each (possibly abandoned)
> library I wish to use with 5.2?

The preprocessor value to check is LUA_VERSION_NUM.

I found these conditionals useful when making a portable version of winapi:

#if LUA_VERSION_NUM > 501
#define lua_objlen lua_rawlen
#endif

luaL_register doesn't exist; this is the equivalent for modifying a metatable

  luaL_newmetatable(L,Window_MT);
#if LUA_VERSION_NUM > 501
  luaL_setfuncs(L,Window_methods,0);
#else
  luaL_register(L,NULL,Window_methods);
#endif

and here's a little hack so that the 'winapi' table is available
globally (I need this because the library has embedded Lua code
referring to winapi)

#if LUA_VERSION_NUM > 501
    lua_newtable(L);
    luaL_setfuncs (L,winapi_funs,0);
    lua_pushvalue(L,-1);
    lua_setglobal(L,"winapi");
#else
    luaL_register(L,"winapi",winapi_funs);
#endif

Anything involving function enivronments has to be rewritten, of course

steve d.