decodes (demangles) low-level names into user-level names so that the linker can keep these overloaded functions from clashing.
may use c++filt to demangle
$ c++filt _ZNSt8ios_base4InitD1Ev
You may try adding
-lstdc++ to your link command
to resolve the issue.
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 1 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:
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.
- On some systems, both the C and C++ compilers put an underscore in front of every name. For example, the C name
foogets the low-level name
_foo. This option removes the initial underscore. Whether
the underscore by default is target dependent.
- Prints demangled names using Java syntax. The default is to use C++ syntax.
- Do not remove the initial underscore.
- When demangling the name of a function, do not display the types of the function's parameters.
c++filtcan 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
- Print the version number of
c++filtis a new utility, and the details of its user interface are subject to change in future releases. In particular, a command-line option may be required in the the future to decode a name passed as an argument
on the command line; in other words,c++filt symbol
may in a future release becomec++filt option symbol