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From GCC manpage

Compiling C++ Programs

      C++ source files conventionally use one of the suffixes .C, .cc, .cpp,
      .CPP, .c++, .cp, or .cxx; C++ header files often use .hh or .H; and
      preprocessed C++ files use the suffix .ii.  GCC recognizes files with
      these names and compiles them as C++ programs even if you call the com-
      piler the same way as for compiling C programs (usually with the name
      However, the use of gcc does not add the C++ library.  g++ is a program
      that calls GCC and treats .c, .h and .i files as C++ source files
      instead of C source files unless -x is used, and automatically speci-
      fies linking against the C++ library.  This program is also useful when
      precompiling a C header file with a .h extension for use in C++ compi-
      lations.  On many systems, g++ is also installed with the name c++.
      When you compile C++ programs, you may specify many of the same com-
      mand-line options that you use for compiling programs in any language;
      or command-line options meaningful for C and related languages; or
      options that are meaningful only for C++ programs.