Re: Compile error for struct on OS-X

[Dan Christian <danchristian65@...>]

Thanks, that was very helpful.  I had removed lua-5.3.

I really need lua5.1 because it's compatible with luajit.  When I have
ports install luarocks, it's pulling in 5.3 as a dependency.

Now I just need to either figure out how to get macports to install a
lua5.1 versions of luarocks, lua-luajson, lua-luasocket, lua-luasec or
build all that from source.

Dan


On Tue, Mar 29, 2016 at 5:45 PM, Philipp Janda <siffiejoe@gmx.net> wrote:
> Am 30.03.2016 um 01:46 schröbte Dan Christian:
>>
>> I'm trying to install struct on OS-X (10.11), and am getting compile
>> errors.  I'm new to Lua, so I might be missing something obvious.  The
>> details are at the end:
>>
>> I have Lua51 installed via macports, along with luarocks.  I'll
>> primarily be using it with luajit.
>
>
> You are not using Lua 5.1 at the moment. You are using Lua 5.3. See below.
>
>>
>> Anybody have this working?
>>
>> Is there a way to get luarocks to use gcc?
>
>
> Yes, you can append the CC and LD variables to your LuaRocks incantation:
>
>     luarocks install struct CC='env MACOSX_DEPLOYMENT_TARGET=10.8 gcc'
> LD='env MACOSX_DEPLOYMENT_TARGET=10.8 gcc'
>
> (you can also add those to your config file to make them permanent.)
>
>>
>> Where would I send a bug?
>
>
> This list is usually a good start if you don't know a better place.
>
>>
>> Thanks,
>>
>> Dan
>>
>>
>> sudo luarocks install struct
>>
>> Installing https://luarocks.org/struct-1.2-2.src.rock...
>
>
> This version is pretty old. The latest version available on LuaRocks is
> 1.4-1, but that version specifies that it is only compatible with Lua >= 5.1
> and < 5.3. Since this later version isn't chosen, we can deduce that
> LuaRocks assumes that you don't have Lua 5.1 or 5.2 installed. The old 1.2-1
> version *should* have specified that it is only compatible with Lua 5.1, but
> back in the day folks were overly optimistic about compatibility with future
> Lua versions.
>
>>
>> Using https://luarocks.org/struct-1.2-2.src.rock... switching to 'build'
>> mode
>>
>> env MACOSX_DEPLOYMENT_TARGET=10.8 /usr/bin/clang -O2 -fPIC
>> -I/opt/local/include -c struct.c -o struct.o
>>
>> struct.c:181:27: warning: implicit declaration of function
>> 'luaL_putchar' is invalid in C99 [-Wimplicit-function-declaration]
>>
>>      while (toalign-- > 0) luaL_putchar(&b, '\0');
>>
>>                            ^
>
>
> `luaL_putchar` was a thing in Lua 5.0. Lua 5.1 still had it for
> compatibility. Lua 5.2 and 5.3 don't have that function/macro anymore. Did I
> mention that the struct-1.2-2 version is pretty old?!
>
>>
>> struct.c:318:37: error: array has incomplete element type 'const
>> struct luaL_reg'
>>
>> static const struct luaL_reg thislib[] = {
>>
>>                                      ^
>
>
> `luaL_reg` was renamed to `luaL_Reg` in Lua 5.1 (which also supported the
> old name for compatiblity). Lua 5.2 and 5.3 don't.
>
>>
>> struct.c:318:21: note: forward declaration of 'struct luaL_reg'
>>
>> static const struct luaL_reg thislib[] = {
>>
>>                      ^
>>
>> struct.c:326:3: warning: implicit declaration of function
>> 'luaL_register' is invalid in C99 [-Wimplicit-function-declaration]
>>
>>    luaL_register(L, "struct", thislib);
>>
>>    ^
>
>
> `luaL_register` is deprecated (but available) in Lua 5.2, and gone by
> default in Lua 5.3.
>
>>
>> 2 warnings and 1 error generated.
>>
>>
>> Error: Build error: Failed compiling object struct.o
>>
>>
>
>
> I've attached a new rockspec that works[*] for Lua 5.3. Download it and use
> it like this:
>
>     luarocks install struct-1.4-2.rockspec
>
> Lua 5.3 has string (un)packing built-in, btw. Alternatively you can really
> install Lua 5.1 and configure LuaRocks to use that version.
>
> HTH,
> Philipp
>
>
>   [*]: Builds at least. The code is the same as for version 1.4-1, but the
> test script asserts on my machine for Lua 5.1, 5.2, and 5.3.
>
>