Re: __builtin_expect function isn't available in gcc below version 3

> Did you try to set `LUA_NOBUILTIN` with `CFLAGS`? e.g.:
>
> CFLAGS="-DLUA_NOBUILTIN" luarocks install ...

No, I didn't. But manually setting `-DLUA_NOBUILTIN` with CFLAGS is not what I'm looking for. If `-DLUA_NOBUILTIN` would work for me, LuaRocks would automatically apply `-DLUA_NOBUILTIN` behind the scene when running `luarocks install <package name>`. Though, I don't know if LuaRocks can be configured to do that.
Anyway, the Haiku developer Begasus and I chose to patch the headers, which does work for us. Also in my opinion, it's the easiest solution. It doesn't require to put `-DLUA_NOBUILTIN` almost everywhere.

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On Sunday, March 1st, 2026 at 8:12 AM, Christophe Delord <[email protected]> wrote:

> Hello,
>
> Le 01/03/2026 à 04:09, ‘Richard Beckmann’ via lua-l a écrit :
>
>>> In this case, just compile Lua with -DLUA_NOBUILTIN.
>>
>> Forgot to mention. I and the Haiku developer Begasus already tried `-DLUA_NOBUILTIN` and it wasn't good enough for us. `-DLUA_NOBUILTIN` works for compiling Lua but not when using headers to compile Lua/C modules with LuaRocks. LuaRocks doesn't issue `-DLUA_NOBUILTIN` when compiling Lua/C modules. So, to make building Lua/C modules with LuaRocks work as well, we were forced to patch the headers.
>
> Did you try to set LUA_NOBUILTIN with CFLAGS? e.g.:
>
> CFLAGS=
>
> "-DLUA_NOBUILTIN"
>
> luarocks install ...
>
>> Sent with Proton Mail secure email.
>>
>> On Saturday, February 28th, 2026 at 10:28 AM, Luiz Henrique de Figueiredo
>> [<[email protected]>](mailto:[email protected])
>> wrote:
>>
>>>> When compiling Lua 5.4.7 for Haiku targeting x86 32 bit using gcc 2 I encounter that '__builtin_expect' function isn't available.
>>>
>>> In this case, just compile Lua with -DLUA_NOBUILTIN.
>>>
>>> Thanks for the report and patch.
>>>
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