lua5.1のプラットフォーム間での互換性維持について(主に型のサイズについて)

参考
http://hammm.blog21.fc2.com/blog-entry-55.html
luaではconfig.hをつくって、そこでコンパイル時にちゃんとサイズが決まるようになってる
VMのインストラクションのサイズを追っていくと

llimints.h
http://www.lua.org/source/5.1/llimits.h.html

typedef LUAI_UINT32 lu_int32;

/*
** type for virtual-machine instructions
** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
*/
typedef lu_int32 Instruction;

http://www.lua.org/source/5.1/luaconf.h.html
luaconf.h

/*
@@ LUAI_UINT32 is an unsigned integer with at least 32 bits.
@@ LUAI_INT32 is an signed integer with at least 32 bits.
@@ LUAI_UMEM is an unsigned integer big enough to count the total
@* memory used by Lua.
@@ LUAI_MEM is a signed integer big enough to count the total memory
@* used by Lua.
** CHANGE here if for some weird reason the default definitions are not
** good enough for your machine. (The definitions in the 'else'
** part always works, but may waste space on machines with 64-bit
** longs.) Probably you do not need to change this.
*/
#if LUAI_BITSINT >= 32
#define LUAI_UINT32     unsigned int
#define LUAI_INT32      int
#define LUAI_MAXINT32   INT_MAX
#define LUAI_UMEM       size_t
#define LUAI_MEM        ptrdiff_t
#else
/* 16-bit ints */
#define LUAI_UINT32     unsigned long
#define LUAI_INT32      long
#define LUAI_MAXINT32   LONG_MAX
#define LUAI_UMEM       unsigned long
#define LUAI_MEM        long
#endif

素直にinttype.h使えばいいのにと思ったら、これはC99からだったのね。luaは互換性の点からC89にこだわってるって聞いてるし。

おまけ:inttype.h C99関連でググったら見つけたんだけど
C1Xだと・・・・・・C++0x厨顔真っ赤wwwwww俺大勝利wwwwww
http://en.wikipedia.org/wiki/C1X