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Extensions
to the C++ language
The GNU compiler provides
extensions to the C++ language (and you can also use most of the C language
extensions in your C++ programs). If you want to write code that checks
whether these features are available, you can test for the GNU compiler
the same way as for C programs: check for a predefined macro, __GNUC__.
You can also use __GNUG__
to test specifically for GNU C++ (see Standard
predefined macros in The
C Preprocessor within GNUPro Compiler Tools).
See the following documentation
for more specific discussion regarding extensions to the C++ language family.