On Sun, 2007-07-22 at 11:01 +0100, Ralph Corderoy wrote: > Hi, > > I investigated a problem on the llvmdev mailing list where someone was > trying to find the value of a symbol that has an address of 0. > > $ nm /System/Library/Frameworks/Foundation.framework/Foundation | > > grep .objc_class_name_NSAutoreleasePool > 00000000 A .objc_class_name_NSAutoreleasePool > $ Hi,
It is not possible to lookup this symbol on Mac OS X with dlsym() because it does not have an underscore prefix. If you dlsym(handle,"foo") on Mac OS X, it will actually look for "_foo" (because if you have a C function or variable named foo, it gets an underscore prepended in the object file). It is also not necessary to look up objective C symbols, as far as I am aware, objective C modules are bound fully when loaded and are always loaded globally (I may be wrong on this, please feel free to correct me). In the rest of your email, you suggest that NULL is a valid return and can indicate that a symbol was actually found. I was not previously aware of this, I'll look it up. Thanks, Peter _______________________________________________ Bug-libtool mailing list Bug-libtool@gnu.org http://lists.gnu.org/mailman/listinfo/bug-libtool
