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Re: Newbie to Darwin linking issue I think?
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Re: Newbie to Darwin linking issue I think?


  • Subject: Re: Newbie to Darwin linking issue I think?
  • From: Shantonu Sen <email@hidden>
  • Date: Sat, 4 Jun 2005 16:21:27 -0700

Why are you using libtool(1) instead of the compiler driver cc(1) to create your shared library?

Your problem is that you are not linking against libSystem.dylib (via -lSystem). You're also missing a host of other libraries automatically included when you link a dylib with cc(1). for example:

/usr/bin/libtool -dynamic -arch_only ppc -noall_load - weak_reference_mismatches non-weak -v -o libfoo.dylib -L/usr/lib/gcc/ powerpc-apple-darwin8/4.0.0 -L/usr/lib/gcc/powerpc-apple- darwin8/4.0.0 -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/../../.. foo.o -lgcc -lgcc_eh -lSystemStubs -lmx -lSystem

You should use cc/gcc and the -dynamiclib option to build your library. You probably also want to read the various man pages and use the -install_name flag as well.

Shantonu

On Jun 4, 2005, at 4:06 PM, Damien Cooke wrote:

Sorry for the dumb question. I am porting my malloc to Darwin. I have built it as a shared dynamic library on Solaris. However I am having a large amount of problems with this on OS X 10.4.1 using XCode 2.0 and gcc 4.0

I build the two object files as such

gcc -g -fPIC -c source/lpmalloc.c -o output/lpmalloc.o
gcc -g -fPIC -c source/global.c -o output/global.o

Then I use Libtool as such libtool -dynamic -o bin/liblpmalloc.so output/lpmalloc.o output/global.o

This is what I get:

ld: for architecture ppc
ld: Undefined symbols:
_printf
libtool: internal link edit command failed


I am probably doing something really dumb but any help would be greatly appreciated.


Damien

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