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3.11.3.1 Interfacing to C++ ¶

GNAT supports interfacing with the G++ compiler (or any C++ compiler generating code that is compatible with the G++ Application Binary Interface —see ‘http://itanium-cxx-abi.github.io/cxx-abi/abi.html’).

You can do interfacing at three levels: simple data, subprograms, and classes. In the first two cases, GNAT offers a specific Convention C_Plus_Plus (or CPP) that behaves exactly like Convention C. Usually, C++ mangles the names of subprograms. To generate proper mangled names automatically, see Generating Ada Bindings for C and C++ headers). You can also address this problem addressed manually in two ways:

• by modifying the C++ code in order to force a C convention using the extern "C" syntax.
• by figuring out the mangled name (using e.g. nm or by looking at the assembly code generated by the C++ compiler) and using it as the Link_Name argument of the pragma Import.

You can achieve interfacing at the class level by using the GNAT specific pragmas such as CPP_Constructor. See the GNAT_Reference_Manual for additional information.