With the exception of the pointer-to-function type, types do not have C or C++ linkage. Even though most C++ compilers do not have different linkage for C and C++ data objects, you should declare C data objects to have C linkage in C++ code. When you need to access a function compiled with C linkage (for example, a function compiled by the C compiler, or a function written in assembler), declare the function to have C linkage. All C++ compilers also support C linkage, for some compatible C compiler. The default linkage for objects and functions is C++. The C++ language provides a 'linkage specification' with which you declare that a function or object follows the program linkage conventions for a supported language. Oracle Developer Studio C and C++ compilers use compatible headers, and use the same C runtime library. If the C++ compiler provides its own versions of the C headers, the versions of those headers used by the C compiler must be compatible. C++ includes the standard C runtime library as a subset, although there are a few differences.

The C runtime library used by your C compiler must also be compatible with the C++ compiler. Any C compiler that is compatible with the Oracle Developer Studio C compiler is also compatible with the Oracle Developer Studio C++ compiler. Third-party C compilers for Oracle Solaris usually also follow the ABI.

Oracle Developer Studio C and C++ compilers follow the Oracle Solaris ABI and are compatible. Any useful compiler for Oracle Solaris must follow this ABI. The Oracle Solaris operating system specifies the Application Binary Interface (ABI) of C programs, which includes information about basic types and how functions are called. They must, for example, define basic types such as int, float or pointer in the same way. The first requirement for mixing code is that the C and C++ compilers you are using must be compatible. Accessing C++ Code from Within C Source.Accessing C Code from Within C++ Source.In all cases we show what is needed when using Oracle Developer Studio C and C++ compilers. This article shows how to solve common problems that arise when you mix C and C++ code, and highlights the areas where you might run into portability issues. You can experience varying degrees of success as you port such code to different platforms and compilers. The C++ language provides mechanisms for mixing code that is compiled by compatible C and C++ compilers in the same program.

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