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2. nm

 
nm [`-a'|`--debug-syms'] [`-g'|`--extern-only']
   [`-B'] [`-C'|`--demangle'[=style]] [`-D'|`--dynamic']
   [`-s'|`--print-armap'] [`-A'|`-o'|`--print-file-name']
   [`-n'|`-v'|`--numeric-sort'] [`-p'|`--no-sort']
   [`-r'|`--reverse-sort'] [`--size-sort'] [`-u'|`--undefined-only']
   [`-t' radix|`--radix='radix] [`-P'|`--portability']
   [`--target='bfdname] [`-f'format|`--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 9. 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-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. The size of the symbol is printed, rather than the value.

-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 15.1 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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