How do you ld code in mach so that the stdlib is overwritten?

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1 total messages Started by Peter Kocks Mon, 13 Apr 1992 16:12

#657

Author: Peter Kocks
Date: Mon, 13 Apr 1992 16:12

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Hi,

I'm try to port some malloc debugging tools for unix to NeXT/MACH (recently
posted to comp.sources.reviewed).  This may be futile, but I'm trying
anyway.  

The programs compile fine, but when I try to link I always get
messages like "malloc defined twice...exit".  On the NeXT there
already is a MallocDebug library which is used to override the
libsys_s.a version of malloc.   You simply add -lMallocDebug to your
command line and everything works fine.  I looked into the NeXT
MallocDebug library and discovered it was not a standard archive.
This leads me to conclude that they did not use the standard "ar"
"ranlib" when compling there library.  

So, how do you do it?  How do you make a library of object code such
that when loaded first, all subsequent loads of objects of the same
thing are ignored?  In unix this seems simple, in MACH not.

Please respond by e-mail
--Peter Kocks
  kocks@chemsitry.stanford.edu

P.S.
Incidently, the reason I am not using the NeXT provided MallocDebug
library is that it does not work as well as I would like with gdb.
I'm not programming NeXT applications so the MallocDebug application
is not the answer either.  The code I have seems like it will do a lot
and I will post if it works.

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