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Caution: This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs.


Demangle C++ and Java symbols


c++filt [-_|--strip-underscores]
        [-s format|--format=format]
        [--help]  [--version]  [symbol...]


-_ or --strip-underscores
On some systems, both the C and C++ compilers put an underscore in front of every name. For example, the C name foo gets the low-level name _foo. This option removes the initial underscore. Whether c++filt removes the underscore by default is target dependent.
-j or --java
Prints demangled names using Java syntax. The default is to use C++ syntax.
-n or --no-strip-underscores
Do not remove the initial underscore.
-p or --no-params
When demangling the name of a function, do not display the types of the function's parameters.
-s format or --format=format
c++filt can decode various methods of mangling, used by different compilers. The argument to this option selects which method it uses:
Automatic selection based on executable (the default method).
The one used by the gnu C++ compiler (g++).
The one used by the Lucid compiler (lcc).
The one specified by the C++ Annotated Reference Manual.
The one used by the HP compiler (aCC).
The one used by the EDG compiler.
The one used by the GNU C++ compiler (g++) with the V3 ABI.
The one used by the GNU Java compiler (gcj).
The one used by the GNU Ada compiler (GNAT).
Print a summary of the options to c++filt and exit.
Print the version number of c++filt and exit.


The C++ and Java languages provides function overloading, which means that you can write many functions with the same name (providing each takes parameters of different types). All C++ and Java function names are encoded into a low-level assembly label (this process is known as mangling). The c++filt program does the inverse mapping: it decodes (demangles) low-level names into user-level names so that the linker can keep these overloaded functions from clashing.

Every alphanumeric word (consisting of letters, digits, underscores, dollars, or periods) seen in the input is a potential label. If the label decodes into a C++ name, the C++ name replaces the low-level name in the output.

You can use c++filt to decipher individual symbols:

c++filt symbol

If no symbol arguments are given, c++filt reads symbol names from the standard input and writes the demangled names to the standard output. All results are printed on the standard output.

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