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Introduction
1.3 Language extensions and language compliance
The compiler supports numerous extensions to its various source languages. It also
provides several command-line options for controlling compliance with the available
source languages.
1.3.1 Language extensions
The language extensions supported by the compiler are categorized as follows:
C99 features
The compiler makes some language features of C99 available:
• as extensions to strict C90, for example, //-style comments
• as extensions to both Standard C++ and strict C90, for
example, restrict pointers.
For more information see:
• C99 language features available in C90 on page 3-5
• C99 language features available in C++ and C90 on
page 3-7.
Standard C extensions
The compiler supports numerous extensions to strict C99, for
example, function prototypes that override old-style
non-prototype definitions. See Standard C language extensions on
page 3-10 for more information.
These extensions to Standard C are also available in C90.
Standard C++ extensions
The compiler supports numerous extensions to strict C++, for
example, qualified names in the declaration of class members. See
Standard C++ language extensions on page 3-15 for more
information.
These extensions are not available in either Standard C or C90.
Standard C and Standard C++ extensions
The compiler supports some extensions specific to strict C++ and
strict C90, for example, anonymous classes, structures, and
unions. See Standard C and standard C++ language extensions
on page 3-19 for more information.
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