Compile link------nm command _ Compile link

Use

Displays symbolic information about object files, executables, and object files libraries. Grammar

NM [-A] [-c] [-x {32|64|32_64|d64| any}] [-f] [-h] [-l] [-p] [-r] [-T] [-e] [-G |-u] [-D |-o |-X |-tformat] File ... Description

The NM command displays information about the symbol in the specified file, which can be an object file, an executable file, or an object file library. If the file does not contain symbolic information, the NM command reports the situation, but does not interpret it as an error condition. The NM command reports numeric values under decimal notation by default.

The NM command writes the following symbolic information to the standard output: library or object name

If you specify the-a option, the NM command only reports on the file or library or object name. Symbol name Symbol type

The NM command represents a file symbol type using the following symbols, which represent weak symbols as global symbols with the same characters:

Project	Description
A	Global absolute symbol.
A	Local absolute symbol.
B	Global BSS symbol.
B	Local BSS symbol.
D	Global data symbol.
D	Local data symbol.
F	The Source file name symbol.
L	Global thread-local symbol (TLS).
L	Static thread-local symbol (TLS).
T	Global text symbol.
T	The local text symbol.
U	Undefined symbol.

Value size

If applicable, the NM command reports the size associated with the symbol. Sign

Project	Description
-A	Each row or display the full path name or display the object library name.
-B	Display output in the Berkeley software distribution (BSD) format: Value type name
-C	Restricted decoding (Demangle) C + + name. The default is to decode all C + + symbol names. Note: Symbols in C + + object files have their names decoded before they are used.
-D	Displays the value and size of the symbol in decimal. This is the default value.
-E	Only static and external (global) symbols are displayed.
-F	Displays the full output, including redundant. Text,. Data, and. BSS symbols, which are usually limited.
-G	only external (global) symbols are displayed.
-H	Limits the display of output header data.
-L	Distinguishes WEAK and GLOBAL symbols by attaching a * to the WEAK symbol's encoding key. If used with the-p option, the symbol type for the WEAK symbol appears as follows: V WEAK Data symbol w WEAK Text symbol w WEAK undefined symbol Z WEAK BSS symbol
-O	Displays the value and size of the symbol in octal instead of decimal.
-P	Display information in a standard portable output format: Library/Object Name name type value size This format displays numeric values in hexadecimal notation unless you specify a different format with the-T, D, or-o flags. If you specify the-a flag-p flag, only the Library/object Name field is displayed. Similarly, the-P flag displays only the symbol size fields that are appropriate for the size.
-P	Not sorted. The output is displayed in symbol table order.
-R	Reverse order.
-T Format	Displays the numeric value in the specified format, where the format parameter is one of the following symbolic representations: D decimal notation notation. This is the default format for the NM command. o octal symbolic notation. x hexadecimal notation.
-T	Truncate each name of the column that might overflow it, so that the last character of the displayed name is an asterisk. By default, NM displays the full name of the listed symbol, and a name that is longer than the width of the column set for it causes each column to be unable to be aligned after the name.
-U	Only undefined symbols are displayed.
-V	Sort output by value rather than alphabetically.
-X	Displays the value and size of a symbol in hexadecimal instead of a decimal number.
-X Mode	Specifies the type of object file that NM should check. Mode must be one of the following: 32 handle only 32-bit object file 64 handle 64-bit object file 32_64 processing 32-bit and 64-bit object Files D64 quarantine stop 64-bit Xcoff files (magic number = = U803xtocmagic ）。 Any <