14.2.4 Output Formats
The symbol value is in the radix selected by the options, or hexadecimal by default.
If the symbol type is lowercase, the symbol is local; if uppercase, the symbol is global (external). The table below shows the symbol types:
| Symbol | Description |
|---|---|
A |
The symbol’s value is absolute, and will not be changed by further linking. |
B |
The symbol is in the uninitialized data section (known as a bss section). |
C |
The symbol is common. Common symbols are uninitialized data. When linking, multiple common symbols may appear with the same name. If the symbol is defined anywhere, the common symbols are treated as undefined references. |
D |
The symbol is in the initialized data section. |
N |
The symbol is a debugging symbol. |
R |
The symbol is in a read only data section. |
T |
The symbol is in the text (code) section. |
U |
The symbol is undefined. |
V |
The symbol is a weak object. When a weak defined symbol is linked with a normal defined symbol, the normal defined symbol is used with no error. When a weak undefined symbol is linked and the symbol is not defined, the value of the weak symbol becomes zero with no error. |
W |
The symbol is a weak symbol that has not been specifically tagged as a weak object symbol. When a weak defined symbol is linked with a normal defined symbol, the normal defined symbol is used with no error. When a weak undefined symbol is linked and the symbol is not defined, the value of the weak symbol becomes zero with no error. |
? |
The symbol type is unknown, or object file format specific. |