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Extensions to the C Language Family

   GNU C provides several language features not found in ANSI standard
C.  (The `-pedantic' option directs GNU CC to print a warning message if
any of these features is used.)  To test for the availability of these
features in conditional compilation, check for a predefined macro
`__GNUC__', which is always defined under GNU CC.
   These extensions are available in C and Objective C.  Most of them
are also available in C++.  *Note Extensions to the C++ Language: C++
Extensions, for extensions that apply *only* to C++.