Re: coroutine & busy wait?

[Adrián Pérez <copylight@...>]

El 05/02/2005, a las 23:43, Vijay Aswadhati escribió:

> > -----Original Message-----
> > From: lua-bounces@bazar2.conectiva.com.br [mailto:lua-
> > bounces@bazar2.conectiva.com.br] On Behalf Of PA
> > Sent: Saturday, February 05, 2005 4:24 AM
> > To: Lua list
> > Subject: Re: coroutine & busy wait?
> >
> > I tried to follow Luiz's instruction at "Installing my Lua Libraries":
> >
> > http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/install.html
> >
> > ... but without much success so far:
> >
> > % make
> > cc -I/usr/local/include -ansi -pedantic -Wall -O2    -c -o lalarm.o
> > lalarm.c
> > cc -o lalarm.so -shared lalarm.o
> > cc: unrecognized option `-shared'
> > ld: Undefined symbols:
> > _main
> > _lua_call
> > _lua_error
> > _lua_gethook
> > _lua_gethookmask
> > _lua_gettable
> > _lua_gettop
> > _lua_pushcclosure
> > _lua_pushlstring
> > _lua_pushnil
> > _lua_pushnumber
> > _lua_pushvalue
> > _lua_setfield
> > _lua_sethook
> > _lua_settable
> > _lua_tonumber
> > _lua_type
> > make: *** [lalarm.so] Error 1
> >
> > Does anyone has a make file for Mac OS X?
> >
> > For the record, I'm using lua-5.1-work4 on Mac OS X 10.3.7.
>
> I am bit rusty with *nix these days as I have been working on WinXP. 
> FWIW,
> these errors indicate that the linker is unable to find the Lua 
> library.
> Check the manual for a "-L" option to tell the linker where to look for
> libraries and "-l" option to specify the library for static linking 
> (as in a
> *lib.a archive, I think).

That's right. Libraries in MacOS X cannot have undefined symbols (but 
they can be unresolved and then resolved when the library is loaded, of 
course), that's the reason why you need to link to the Lua libraries. 
Or, if you're compiling a loadable module (i.e: you want to load it 
with loadlib()), you can specify which is the executable that will load 
the module, and symbols will be resolved from there, too. Just the last 
bit: -shared won't work on OSX because it distinguishes libraries vs- 
bundles (aka modules), sou you will end linking with:

  $ gcc -bundle -llua -llualib -L/path/to/lualibsdir -o whatever.so *.o

or:

  $ gcc -bundle -Wl,-executable_name,/path/to/luabinary -o whatever.so 
*.o

Happy coding!

--
Adrian Perez
GPUL/CLUG member » http://gpul.org
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