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Full Discussion: Listing function exports from object file
Top Forums Programming Listing function exports from object file Post 302141112 by DreamWarrior on Wednesday 17th of October 2007 05:36:46 PM
Old 10-17-2007
Listing function exports from object file
Is it possible to view all the functions exported by a given object file?

"dump -tv" comes the closest, but what exactly am I looking for to determine whether the symbol exists in the object file?

Essentially, I have a library that requires a call to "xdr_sizeof" and the compile is failing because the linker can not find it. I am curious if I can find where (and if) this function is provided so I can link it in. I have ran the following under /usr/lib:

Code:
for i in `find . -name "*.a"`
do
cnt=`dump -tv $i | grep -c xdr_sizeof`
if [ $cnt -ne 0 ]
then
echo $i " " $cnt
fi
done

Running this I get:

./libnsl.a 3
./libnsl_r.a 3
./libtt.a 1
./libnisdb.a 4

How do I know which of those, if any, actually contains the xdr_sizeof function I want? Is there a better way to do the dump to limit it only to outputing lines for functions exported by the library? Am I completely off base here? I know the function can not be in four different libraries...or it shouldn't be....

AIX 5.2 is the O/S if it matters!

Thanks y'all!
 

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LEARN ABOUT FREEBSD

crunchide

CRUNCHIDE(1)						    BSD General Commands Manual 					      CRUNCHIDE(1)

NAME

     crunchide -- hides symbol names from ld, for crunching programs together

SYNOPSIS

     crunchide [-f keep-list-file] [-k keep-symbol] [object-file ...]

DESCRIPTION

     The crunchide utility hides the global symbols of object-file such that they are ignored by subsequent runs of the linker, ld(1).	Some sym-
     bols may be left visible via the -k keep-symbol and -f keep-list-file options.  The keep-list-file must contain a list of symbols to keep
     visible, one symbol per line.  The names given by keep-symbol or in keep-list-file should be C names.  For example, to keep the C function
     ``foo'' visible, the option ``-k foo'' should be used.

     The crunchide utility is designed as a companion program for crunchgen(1), which automates the process of creating crunched binaries from
     multiple component programs.

SEE ALSO

     crunchgen(1), ld(1)

AUTHORS

     The crunch utility was written by James da Silva <jds@cs.umd.edu>.

     Copyright (c) 1994 University of Maryland.  All Rights Reserved.

     Chris Demetriou <cgd@netbsd.org> reorganized crunchide so that it supported multiple object formats, and added ELF object support and ECOFF
     object recognition.

     Copyright (c) 1997 Christopher G. Demetriou.  All Rights Reserved.

BSD
								   June 14, 1994							       BSD
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