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2. nm

 
nm [‘-a’|‘--debug-syms’] [‘-g’|‘--extern-only’]
   [‘-B’] [‘-C’|‘--demangle’[=style]] [‘-D’|‘--dynamic’]
   [‘-S’|‘--print-size’] [‘-s’|‘--print-armap’]
   [‘-A’|‘-o’|‘--print-file-name’][‘--special-syms’]
   [‘-n’|‘-v’|‘--numeric-sort’] [‘-p’|‘--no-sort’]
   [‘-r’|‘--reverse-sort’] [‘--size-sort’] [‘-u’|‘--undefined-only’]
   [‘-tradix|‘--radix=radix] [‘-P’|‘--portability’]
   [‘--target=bfdname] [‘-fformat|‘--format=format]
   [‘--defined-only’] [‘-l’|‘--line-numbers’] [‘--no-demangle’]
   [‘-V’|‘--version’] [‘-X 32_64’] [‘--help’]  [objfile…]

GNU nm lists the symbols from object files objfile…. If no object files are listed as arguments, nm assumes the file ‘a.out’.

For each symbol, nm shows:

The long and short forms of options, shown here as alternatives, are equivalent.

-A
-o
--print-file-name

Precede each symbol by the name of the input file (or archive member) in which it was found, rather than identifying the input file once only, before all of its symbols.

-a
--debug-syms

Display all symbols, even debugger-only symbols; normally these are not listed.

-B

The same as ‘--format=bsd’ (for compatibility with the MIPS nm).

-C
--demangle[=style]

Decode (demangle) low-level symbol names into user-level names. Besides removing any initial underscore prepended by the system, this makes C++ function names readable. Different compilers have different mangling styles. The optional demangling style argument can be used to choose an appropriate demangling style for your compiler. See section c++filt, for more information on demangling.

--no-demangle

Do not demangle low-level symbol names. This is the default.

-D
--dynamic

Display the dynamic symbols rather than the normal symbols. This is only meaningful for dynamic objects, such as certain types of shared libraries.

-f format
--format=format

Use the output format format, which can be bsd, sysv, or posix. The default is bsd. Only the first character of format is significant; it can be either upper or lower case.

-g
--extern-only

Display only external symbols.

-l
--line-numbers

For each symbol, use debugging information to try to find a filename and line number. For a defined symbol, look for the line number of the address of the symbol. For an undefined symbol, look for the line number of a relocation entry which refers to the symbol. If line number information can be found, print it after the other symbol information.

-n
-v
--numeric-sort

Sort symbols numerically by their addresses, rather than alphabetically by their names.

-p
--no-sort

Do not bother to sort the symbols in any order; print them in the order encountered.

-P
--portability

Use the POSIX.2 standard output format instead of the default format. Equivalent to ‘-f posix’.

-S
--print-size

Print size, not the value, of defined symbols for the bsd output format.

-s
--print-armap

When listing symbols from archive members, include the index: a mapping (stored in the archive by ar or ranlib) of which modules contain definitions for which names.

-r
--reverse-sort

Reverse the order of the sort (whether numeric or alphabetic); let the last come first.

--size-sort

Sort symbols by size. The size is computed as the difference between the value of the symbol and the value of the symbol with the next higher value. If the bsd output format is used the size of the symbol is printed, rather than the value, and ‘-S’ must be used in order both size and value to be printed.

--special-syms

Display symbols which have a target-specific special meaning. These symbols are usually used by the target for some special processing and are not normally helpful when included included in the normal symbol lists. For example for ARM targets this option would skip the mapping symbols used to mark transitions between ARM code, THUMB code and data.

-t radix
--radix=radix

Use radix as the radix for printing the symbol values. It must be ‘d’ for decimal, ‘o’ for octal, or ‘x’ for hexadecimal.

--target=bfdname

Specify an object code format other than your system's default format. See section Target Selection, for more information.

-u
--undefined-only

Display only undefined symbols (those external to each object file).

--defined-only

Display only defined symbols for each object file.

-V
--version

Show the version number of nm and exit.

-X

This option is ignored for compatibility with the AIX version of nm. It takes one parameter which must be the string ‘32_64’. The default mode of AIX nm corresponds to ‘-X 32’, which is not supported by GNU nm.

--help

Show a summary of the options to nm and exit.


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