The C++ spec linking routines have not yet been completely implemented, and so are disabled in the current version of the C++ producer.
A C++ spec file is a dump of the C++ producer's internal representation of a translation unit. Such files can be written to, and read from, disk to perform such operations as intermodule analysis.
Note that the format of a C++ spec file is specific to the C++ producer and may change between releases to reflect modifications in the internal type system. The C producer has a similar dump format, called a C spec file, however the two are incompatible. If intermodule analysis between C and C++ source files is required then the symbol table dump format should be used.
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