Re: OS X is not (should not be) so different

[Gé Weijers <ge@...>]

One issue: SUSv3 (Single Unix Specification, v3) requires you to either specify RTLD_LOCAL or RTLD_GLOBAL to 'dlopen'. The result is 'unspecified', otherwise. I suggest adding RTLD_LOCAL to the 'mode' parameter for 'dlopen' in the next version of Lua.

Another bugaboo: 'dlerror' is not required to be thread-safe. (dlopen/dlclose/dlsym are). I don't know what to do about that.....

Gé

On Apr 3, 2007, at 4:48 PM, Luiz Henrique de Figueiredo wrote:

You may need to build a .dylib.

  gcc -dynamiclib

Actually, I forgot -bundle. This line works:

cc -o random.so -bundle -undefined dynamic_lookup lrandom.o

But, as you suggested, so does

cc -o random.so -dynamiclib -undefined dynamic_lookup lrandom.o

The .so created with the first one is smaller. I don't know whether this means

anything...

Anyway, it seems that using dlopen in Mac OS X 10.4 is ok. Great.

Again, the correct Makefile line for building Lua to use dlopen is

$(MAKE) all MYCFLAGS="-DLUA_USE_LINUX" MYLIBS="-lreadline"

but perhaps LUA_USE_LINUX is confusing... (LUA_USE_LINUX just means

LUA_USE_POSIX, LUA_USE_DLOPEN, and LUA_USE_READLINE).

--lhf

--

Gé Weijers

ge@weijers.org