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6.12 Other Extensions to C Syntax ¶

GNU C has traditionally supported numerous extensions to standard Csyntax. Some of these features were originally intended forcompatibility with other compilers or to ease traditional Ccompatibility, some have been adopted into subsequent versions of theC and/or C++ standards, while others remain specific to GNU C.

• Statements and Declarations in Expressions
• Locally Declared Labels
• Labels as Values
• Nested Functions
• Referring to a Type withtypeof
• Determining the Number of Elements of Arrays
• The maximum and minimum representable values of a type
• Support foroffsetof
• Determining the Alignment of Functions, Types or Variables
• Extensions toenum Type Declarations
• Support for the_Bool Type
• Macros with a Variable Number of Arguments.
• Conditionals with Omitted Operands
• Case Ranges
• Mixed Declarations, Labels and Code
• C++ Style Comments
• Slightly Looser Rules for Escaped Newlines
• Hex Floats
• Binary Constants using the ‘0b’ Prefix
• Dollar Signs in Identifier Names
• The CharacterESC in Constants
• Raw String Literals
• Alternate Keywords
• Function Names as Strings