nmedit man page on OpenDarwin

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NMEDIT(1)							     NMEDIT(1)

NAME
       nmedit - change global symbols to local symbols

SYNOPSIS
       nmedit  -s  list_file  [-R  list_file] [-p] [-A] [-] [[-arch arch_type]
       ...] object_file ... [-o output]

DESCRIPTION
       Nmedit changes the global symbols not listed in the list_file  file  of
       the  -s list_file option to static symbols.  Undefined symbols and com‐
       mon symbols are not effected and shouldn't be listed in list_file.  For
       dynamic	libraries  symbols are turned into private extern symbols that
       are no longer external (rather than static symbols).  This is  done  so
       that  the  references between modules of a dynamic library are resolved
       to the symbols in the dynamic library.  Nmedit differs from strip(1) in
       that it also changes the symbolic debugging information (produce by the
       -g option to cc(1)) for the global symbols it changes to static symbols
       so that the resulting object can still be used with the debugger.

       Nmedit  like strip(1) is useful to limit the symbols for use with later
       linking.	 This allows control of	 the  interface	 that  the  executable
       wants  to  provide to the objects that it will dynamically load, and it
       will not have to publish symbols that are not part  of  its  interface.
       For  example  an	 executable  that wishes to allow only a subset of its
       global symbols but all of the shared libraries globals to be used would
       have its symbol table edited with:
	      % nmedit -s interface_symbols -A executable
       where  the file interface_symbols would contain only those symbols from
       the executable that it wishes the objects loaded	 at  runtime  to  have
       access to.  Another example is an object that is made up of a number of
       other objects that will be loaded into an executable  would  built  and
       then have its symbol table edited with:
	      % ld -o relocatable.o -r a.o b.o c.o
	      % nmedit -s interface_symbols relocatable.o
       which would leave only the symbols listed in the file interface_symbols
       (and the undefined and common symbols) as global symbols in the	object
       file.

       The one or more of the following options is required to nmedit(1) is:

       -s filename
	      Leave  the symbol table entries for the global symbols listed in
	      filename global but turn all other global symbols (except	 unde‐
	      fined and common symbols) into static symbols.  The symbol names
	      listed in filename must be one per line.	Leading	 and  trailing
	      white  space  are	 not  part of the symbol name.	Lines starting
	      with # are ignored, as are lines with only white space.

       -R filename
	      Change the symbol table entries for the global symbols listed in
	      filename	into static symbols.  This file has the same format as
	      the -s filename option above.  If	 the  -R  filename  option  is
	      specified	 without  the -s filename option, then all symbols not
	      listed in the -R filename option's filename are left as globals.
	      If  both	a  -R filename and a -s filename are given the symbols
	      listed in the -R filename are basically ignored and  only	 those
	      symbols listed in the -s filename are saved.

       -p     Change  symbols  to  private externs instead of static.  This is
	      allowed as the only option to change all defined global  symbols
	      to private externs.

       The options to nmedit(1) are:

       -A     Leave  all  global absolute symbols except those with a value of
	      zero, and save objective-C class symbols as  globals.   This  is
	      intended	for use of programs that load code at runtime and want
	      the loaded code to use symbols from the shared libraries.

       -      Treat all remaining arguments as file names and not options.

       -arch arch_type
	      Specifies the architecture, arch_type, of the file for nmedit(1)
	      to process when the file is a fat file (see arch(3) for the cur‐
	      rently know arch_types).	The arch_type can be  all  to  process
	      all  architectures  in  the file.	 The default is to process all
	      architectures that are contained in the file.

       -o output
	      Write the result into the file output.

SEE ALSO
       strip(1), ld(1), arch(3)

BUGS
       The changing of the symbolic debugging information  by  nmedit  is  not
       known  to be totally correct and could cause the debugger to crash, get
       confused or produce incorrect information.

Apple Computer, Inc.		March 19, 2002			     NMEDIT(1)
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