Trouble with underscores
Subject : Trouble with underscores From: Sean Hinde <email@hidden >
Date: Mon, 28 Oct 2002 17:47:08 +0000
Hi, I posted this up at Apple Discussions but no joy yet.. maybe someone
here can help? I'm trying to finish part of the port of Erlang (www.erlang.org) to OS
X and have some problems with its crypto application.. The build process makes an object file using (slightly cut down for
clarity): ld -r -u MD5 -lcrypto -o elib.o which is made into a shared library with cc -bundle -flat_namespace -undefined suppress elib.o -o elibcrypto.so
-lc -lcurses -lm This is loaded into the erlang system with the snippet: dyld_last_result = NSCreateObjectFileImageFromFile(dlname, &ofile);
if (dyld_last_result == NSObjectFileImageSuccess)
handle = NSLinkModule(ofile, dlname, NSLINKMODULE_OPTION_PRIVATE);
return handle; But I get a load of stuff to stderror: dyld: /opt/R9B/lib/erlang/erts-5.2/bin/beam Undefined symbols:
MD5 My current theory is that this is something to do with underscores and
indeed if I use: ld -r -u _MD5 -l crypto -o elib.o as the first step then things get a little farther - until the next
snippet from erlang which tries to find a reference to the symbol with: NSSymbol nssymbol = NSLookupSymbolInModule((NSModule*)handle,func_name);
return nssymbol != NULL ? NSAddressOfSymbol(nssymbol) : NULL; which returns NULL. This all works fine with Linux/Solarix etc (using dlsym etc). Does
anyone have any further suggestions? Thanks, Sean
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