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Full Discussion: function call in executable
Top Forums Programming function call in executable Post 96761 by jim mcnamara on Monday 23rd of January 2006 10:50:03 AM
Old 01-23-2006
This is a link issue. Let me give you an example:
Code:
grep JSInitReport tmp.c 
... returns nothing, the symbol in not in tmp.c
nm tmp | grep JSInitReport  
... returns nothing

ll tmp
-rw-r--r--   1 jmcnama    prog        21392 Jan 23 08:33 tmp
.. note the size of the tmp executable image file.
.. if I add this to the list of input files to cc
/utility/c/lib/libsctu.a
.... Now:
nm tmp | grep JSInitReport      
JSInitReport        |     12484|extern|entry  |$CODE$
ll tmp
-rw-r--r--   1 jmcnama    prog        214925 Jan 23 08:39 tmp
... note the executable image is now almost ten times larger because of new static symbols

The linker added the symbol, even though the primary module did not call it.
And it will never be executed

You need to find a different way to link your files if you have to use nm to find only symbols that are actually invoked.

I believe if you use ar to create a library, you can then ask the linker to search the library, rather than including all the symbols from the whole archive. Use the
Code:
 -l <file.a> -a archive

syntax
Last edited by jim mcnamara; 01-23-2006 at 12:08 PM..
 

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LEARN ABOUT DEBIAN

aa-autodep

AA-AUTODEP(8)							     AppArmor							     AA-AUTODEP(8)

NAME

       aa-autodep - guess basic AppArmor profile requirements

SYNOPSIS

       aa-autodep <executable> [<executable> ...]

DESCRIPTION

       aa-autodep is used to generate a minimal AppArmor profile for a set of executables. This program will generate a profile for binary
       executable as well as interpreted script programs. At a minimum aa-autodep will provide a base profile containing a base include directive
       which includes basic profile entries needed by most programs.  The profile is generated by recursively calling ldd(1) on the executables
       listed on the command line.

BUGS

       This program does not perform full static analysis of executables, so the profiles generated are necessarily incomplete. If you find any
       bugs, please report them at <http://https://bugs.launchpad.net/apparmor/+filebug>.

SEE ALSO

       apparmor(7), apparmor.d(5), aa-complain(1), aa-enforce(1), aa-disable(1), aa_change_hat(2), and <http://wiki.apparmor.net>.

AppArmor 2.7.103						    2012-06-28							     AA-AUTODEP(8)
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