> On 31/10/2025 09:52 EET Eray Aslan via dovecot <[email protected]> wrote:
> 
>  
> Hi,
> 
> Building dovecot-2.4.2 fails to build against lua5-1:
> 
> $ ./configure --with-lua
> [...]
> checking for lua5.1 >= 5.1 lua5.1 != 5.2... yes
> configure: using library lua5.1
> checking for lua_newstate... yes
> checking for luaL_setfuncs... no
> checking for luaL_setmetatable... no
> checking for lua_isinteger... no
> checking for lua_resume... yes
> checking for lua_seti... no
> checking for lua_tointegerx... no
> checking for lua_yieldk... no
> [...]
> $ make
> [...]
>   CC       dlua-iostream.lo
> dlua-iostream.c:16:28: error: field 'stream' has incomplete type
>    16 |         struct luaL_Stream stream;
>       |                            ^~~~~~
> dlua-iostream.c: In function 'dlua_o_write':
> dlua-iostream.c:68:24: error: implicit declaration of function 
> 'luaL_tolstring'; did you mean 'lua_tolstring'? 
> [-Wimplicit-function-declaration]
>    68 |         vec.iov_base = luaL_tolstring(L, 2, &vec.iov_len);
>       |                        ^~~~~~~~~~~~~~
>       |                        lua_tolstring
> dlua-iostream.c:68:22: error: assignment to 'const void *' from 'int' makes 
> pointer from integer without a cast [-Wint-conversion]
>    68 |         vec.iov_base = luaL_tolstring(L, 2, &vec.iov_len);
>       |                      ^
> dlua-iostream.c:73:24: error: implicit declaration of function 
> 'luaL_fileresult'; did you mean 'luaL_pushresult'? 
> [-Wimplicit-function-declaration]
>    73 |                 return luaL_fileresult(L, 0, 
> o_stream_get_name(stream->os));
>       |                        ^~~~~~~~~~~~~~~
>       |                        luaL_pushresult
> make[3]: *** [Makefile:786: dlua-iostream.lo] Error 1
> 
> Same configure and make commands succeed when run against lua5-4. Not
> sure if this was intentional as we still check for >= lua5-1 != lua5-2
> in m4/want_lua.m4
> 
> Thanks
> -- 
> Eray

Have to check if we can drop lua5.1 support. Otherwise need to add a feature 
guard.

Aki

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