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(autoconf.info)C++ Compiler

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C++ Compiler Characteristics
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 - Macro: AC_PROG_CXX ([COMPILER-SEARCH-LIST])
     Determine a C++ compiler to use.  Check if the environment variable
     `CXX' or `CCC' (in that order) is set; if so, then set output
     variable `CXX' to its value.

     Otherwise, if the macro is invoked without an argument, then
     search for a C++ compiler under the likely names (first `g++' and
     `c++' then other names).  If none of those checks succeed, then as
     a last resort set `CXX' to `g++'.

     This macro may, however, be invoked with an optional first argument
     which, if specified, must be a space separated list of C++
     compilers to search for.  This just gives the user an opportunity
     to specify an alternative search list for the C++ compiler.  For
     example, if you didn't like the default order, then you could
     invoke `AC_PROG_CXX' like this:

          AC_PROG_CXX(cl KCC CC cxx cc++ xlC aCC c++ g++ egcs gcc)

     If using the GNU C++ compiler, set shell variable `GXX' to `yes'.
     If output variable `CXXFLAGS' was not already set, set it to `-g
     -O2' for the GNU C++ compiler (`-O2' on systems where G++ does not
     accept `-g'), or `-g' for other compilers.

 - Macro: AC_PROG_CXXCPP
     Set output variable `CXXCPP' to a command that runs the C++
     preprocessor.  If `$CXX -E' doesn't work, `/lib/cpp' is used.  It
     is only portable to run `CXXCPP' on files with a `.c', `.C', or
     `.cc' extension.

     If the current language is C++ (Note: Language Choice), many of
     the specific test macros use the value of `CXXCPP' indirectly by
     calling `AC_TRY_CPP', `AC_CHECK_HEADER', `AC_EGREP_HEADER', or
     `AC_EGREP_CPP'.

     Some preprocessors don't indicate missing include files by the
     error status.  For such preprocessors an internal variable is set
     that causes other macros to check the standard error from the
     preprocessor and consider the test failed if any warnings have
     been reported.  However, it is not known whether such broken
     preprocessors exist for C++.