12-20-2009
Here is a genetic way of doing it
Use the nm utility to ouput the symbol table for your application. A 'T' in the second column indicates a function that is either defined in your source code or comes from a static library. A 'U' in the second column indicates a function that is included via a shared library. You then need to massage that list (listA) to remove all the functions that are defined within your source code.
Next write a script to nm each of your 500 libraries and construct a sorted list (listB) of library + function names.
Finally write a script which uses listB to update listA by adding a column containing the name of the library where that function is defined.
At this stage you should have a list of all the external functions used by your application together with the name of library which defined the function.
It is then a trivial exercise to figure out which libraries are not needed by the application.
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LDBASH(1) libbash Manual LDBASH(1)
NAME
ldbash -- Dynamic loader for libbash(7) libraries.
SYNOPSIS
ldbash [-h | --help]
ldbash [-l | --list]
ldbash [-L | --load lib,[lib] ...]
ldbash [-U | --unload lib,[lib] ...]
ldbash [-e | --externlist lib,[lib] ...]
ldbash [--externlist-all]
ldbash [--i | --internlista lib,[lib] ...]
ldbash [--internlist-all]
DESCRIPTION
ldbash is used to manipulate libbash(7) libraries. Its main function is to load specific library. It can also print list of available
libraries, list functions each library exports, unload functions, etc.
In case of --load and --unload ,the output is intended to be passed to bash eval command.
Options
-h | --help Print options summary
-l | --list Display list of available libraries. The libraries names listed, may be passed as parameters to other invocations of ldbash.
I.e. first you run ldbash --list to see what is available and then you may load it.
-L | --load lib,[lib] ...
Load given libraries - i.e. print string that should be passed to eval command. Usually the string contains various source
commands.
Libraries that given libraries depend on are also loaded.
Libraries only loaded if their dependencies are satisfied. Dependencies are resolved using ldbash.cache file, which is created
by ldbashconfig(8).
-U | --unload lib,[lib] ...
Unload given libraries, but not their dependencies.
The output should be passed to eval command (in the same manner as with --load ).
-e | --externlist lib,[lib] ...
List all symbols that are exported by given libraries. Symbols are usually functions that given libraries implement.
--externlist-all
List all exported symbols of all available libraries. Symbols are usually functions that library implement.
-i | --internlist lib,[lib] ...
List all internal symbols (i.e. global variables/functions) of given libraries. This is intended mostly for developers that
want to develop library of their own, and want to be sure that they don't override any already defined symbol.
--internlist-all
List all internal symbols of all available libraries. This is intended mostly for developers that want to develop library of
their own, and want to be sure that they don't override any already defined symbol.
FILES
/etc/ldbash.cache
Cache file that contains information about libraries dependencies and list of exported symbols. See ldbashconfig((8)) for further
details.
BUGS
The script can't load libraries if their file name starts with '-'. (If someone uses file names that start with a '-' he/she deserves it!)
AUTHORS
Hai Zaar <haizaar@gmail.com>
Gil Ran <gil@ran4.net>
SEE ALSO
libbash(7), ldbashconfig(8)
Linux Epoch Linux