Re: [ANN] Lua 5.4.9 (rc1) now available

Dear Lua developers

The '__builtin_expect' fix in Lua 5.5.1 hasn't been backported to Lua 5.4.9 (rc1).

In Lua 5.5.1 'luaconf.h' at line 656
```
#if !defined(LUA_NOBUILTIN) && defined(__GNUC__) && (__GNUC__ >= 3)
#define luai_likely(x) (__builtin_expect(((x) != 0), 1))
#define luai_unlikely(x) (__builtin_expect(((x) != 0), 0))
#else
#define luai_likely(x) (x)
#define luai_unlikely(x) (x)
#endif
#endif
```

In Lua 5.4.9 (rc1) 'luaconf.h' at line 683
```
#if defined(__GNUC__) && !defined(LUA_NOBUILTIN)
#define luai_likely(x) (__builtin_expect(((x) != 0), 1))
#define luai_unlikely(x) (__builtin_expect(((x) != 0), 0))
#else
#define luai_likely(x) (x)
#define luai_unlikely(x) (x)
#endif
#endif
```

The luai_likely/luai_unlikely code from Lua 5.4.9 should be the same as the code from Lua 5.5.1 with the fix in which the GNU compiler version is too low.

Sincerely,

Richard Beckmann

Sent with [Proton Mail](https://proton.me/mail/home) secure email.

On Monday, August 10th, 2026 at 11:36 AM, Luiz Henrique de Figueiredo <[email protected]> wrote:

> Lua 5.4.9 (rc1) is now available for testing at
> https://www.lua.org/work/lua-5.4.9-rc1.tar.gz
>
> The SHA256 checksum is
> 2335b6c582a52654f94612bf10d2f4672805d05329aa6568b1d8cd9e5c6fb8e6 -
>
> The Git commit ID in branch v5.4 is
> 312b9efaa1061c2c4cad08554dbc1351c3270eef
>
> Lua 5.4.9 fixes all bugs listed in
> https://www.lua.org/bugs.html#5.4.8
>
> The complete diffs from Lua 5.4.8 are available at
> https://www.lua.org/work/diffs-lua-5.4.8-lua-5.4.9.html
> https://www.lua.org/work/diffu-lua-5.4.8-lua-5.4.9.html
>
> This is probably the last release of Lua 5.4.
> Now is the time to report glitches and to try to fix any remaining bugs.
>
> We thank everyone for their feedback on Lua 5.4 till now.
>
> All feedback welcome. Thanks.
> --lhf
>
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