autoconf: Objective C++ Compiler

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1 5.10.6 Objective C++ Compiler Characteristics
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1  -- Macro: AC_PROG_OBJCXX ([COMPILER-SEARCH-LIST])
1      Determine an Objective C++ compiler to use.  If `OBJCXX' is not
1      already set in the environment, check for Objective C++ compilers.
1      Set output variable `OBJCXX' to the name of the compiler found.
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1      This macro may, however, be invoked with an optional first argument
1      which, if specified, must be a blank-separated list of Objective
1      C++ compilers to search for.  This just gives the user an
1      opportunity to specify an alternative search list for the
1      Objective C++ compiler.  For example, if you didn't like the
1      default order, then you could invoke `AC_PROG_OBJCXX' like this:
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1           AC_PROG_OBJCXX([gcc g++ objcc++ objcxx])
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1      If using the GNU Objective C++ compiler, set shell variable
1      `GOBJCXX' to `yes'.  If output variable `OBJCXXFLAGS' was not
1      already set, set it to `-g -O2' for the GNU Objective C++ compiler
1      (`-O2' on systems where `gcc' does not accept `-g'), or `-g' for
1      other compilers.
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1  -- Macro: AC_PROG_OBJCXXCPP
1      Set output variable `OBJCXXCPP' to a command that runs the
1      Objective C++ preprocessor.  If `$OBJCXX -E' doesn't work,
1      `/lib/cpp' is used.
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