[luatex] Using a Lua C .so module with LuaLaTeX

[Deepak Jois]

I ran into this message from a thread in Dec 2009 titled ‘Dynamic
loading on Mac OS X’:
http://tug.org/pipermail/luatex/2009-December/001125.html

Like I said before, when I build luatex with --nostrip, it works fine.
Has this ever been enabled by default?

On Mon, Nov 16, 2015 at 10:52 PM, Deepak Jois <deepak.jois at gmail.com> wrote:
> On Mon, Nov 16, 2015 at 9:44 PM, luigi scarso <luigi.scarso at gmail.com> wrote:
>>
>> CC=gcc
>> L=$SVN/trunk/source/libs/lua52/lua-5.2.4/src
>> rm -rf *.o *.la *.lo .libs/
>> $CC -O2 -fpic -I$L -c harfbuzz.c
>> $CC -O -shared -fpic -o harfbuzz.so harfbuzz.o
>> $SVN/bin/luatex -luaonly test.lua
>>
>
> Looks like things work fine on Linux. I tried again on OS X, using
> exactly the commands you are using, but with two modifications:
>
> * As listed on http://lua-users.org/wiki/BuildingModules for OS X:
> “However, unlike GCC on other platforms, you must still link with the
> option '-undefined dynamic_lookup' to avoid getting undefined
> references to liblua”
>
> * I seem to have luatex inside $SVN/trunk/build/texk/web2c/ instead of
> $SVN/trunk/bin, so I changed that
>
>> cat compile.sh
> CC=gcc
> SVN=/Users/deepak/code/personal
> L=$SVN/trunk/source/libs/lua52/lua-5.2.4/src
> rm -rf *.o *.la *.lo .libs/
> $CC -O2 -fpic -c harfbuzz.c
> $CC -O -shared -fpic -undefined dynamic_lookup -o harfbuzz.so harfbuzz.o
> $SVN/trunk/build/texk/web2c/luatex -luaonly test.lua
>
>> ./compile.sh
> error loading module 'harfbuzz' from file './harfbuzz.so':
>         dlopen(./harfbuzz.so, 6): Symbol not found: _luaL_setfuncs
>   Referenced from: ./harfbuzz.so
>   Expected in: flat namespace
>  in ./harfbuzz.so
>
> However with my standard Lua installation on OS X, I get the expected result:
>
>> which lua
> /usr/local/bin/lua
>
>> lua test.lua
> Deepak