Re: Newbie to Darwin linking issue I think?
Re: Newbie to Darwin linking issue I think?
- Subject: Re: Newbie to Darwin linking issue I think?
- From: Damien Cooke <email@hidden>
- Date: Sun, 5 Jun 2005 09:25:26 +0930
Thanks for the hint:
I am now linking like this
cc -dynamiclib -fPIC -o bin/liblpmalloc.so output/lpmalloc.o output/
global.o
But I now get:
ld: warning multiple definitions of symbol _malloc
output/lpmalloc.o definition of _malloc in section (__TEXT,__text)
/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/../../../libSystem.dylib
(malloc.So) definition of _malloc
So how do I tell it I am building a replacement for malloc other than
re-implementing the System.dylib ? Is there a way of dropping
duplicate entries?
Damien
On 05/06/2005, at 8:51 AM, Shantonu Sen wrote:
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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