Re: XCode template for lua modules

[Doug Currie <doug.currie@...>]

On Jul 3, 2009, at 11:17 AM, Hans van der Meer wrote:

> Why does one prescribe for the Mach-O Type the choice  
> "bundle" (mh_bundle) instead of "dynamic library" (mh_dylib). Both  
> seem to work when the result is "require"-ed. Does it matter? Or is  
> there a fundamental difference I am overlooking?

As Asko said, bundle was preferred in very early os x versions.

If your Lua is built to use dlopen it can use bundles or dynamic  
libraries. Lua uses dlopen when built using
-DLUA_USE_LINUX
or
-DLUA_USE_POSIX
-DLUA_USE_DLOPEN
but not when built using
-DLUA_USE_MACOSX
or
-DLUA_USE_POSIX
-DLUA_DL_DYLD

Note that if you make the macosx Lua Makefile target you get - 
DLUA_USE_LINUX and therefore dlopen.

Based on the example of other libraries (thanks, Mike Pall), and my  
reading of
http://developer.apple.com/documentation/DeveloperTools/Conceptual/DynamicLibraries/000-Introduction/Introduction.html#/ 
/apple_ref/doc/uid/TP40001908
my Makefiles use:

gcc -fPIC -dynamiclib -single_module -undefined dynamic_lookup -o  
xxx.so xxx.o yyy.o

The -single_module option is considered obsolete and is the default  
since OS X 10.4.0.

http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/ld.1.html

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