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(automake.info)C++ Support

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C++ Support
===========

   Automake includes full support for C++.

   Any package including C++ code must define the output variable `CXX'
in `configure.in'; the simplest way to do this is to use the
`AC_PROG_CXX' macro (*note Particular Program Checks:
(autoconf)Particular Programs.).

   A few additional variables are defined when a C++ source file is
seen:

`CXX'
     The name of the C++ compiler.

`CXXFLAGS'
     Any flags to pass to the C++ compiler.

`CXXCOMPILE'
     The command used to actually compile a C++ source file.  The file
     name is appended to form the complete command line.

`CXXLINK'
     The command used to actually link a C++ program.