1.3 ANSI/ISO Standard

The compiler supports both the 1989 and 1999 versions of the C language and the 2014 version of the C++ language. The C and C++ language features in the compiler are implemented in conformance with the following ISO standards:

• ISO-standard C

The C compiler supports the 1989 and 1999 versions of the C language.

• C89. Compiling with the --c89 option causes the compiler to conform to the ISO/IEC 9899:1990 C standard, which was previously ratified as ANSI X3.159-1989. The names "C89" and "C90" refer to the same programming language. "C89" is used in this document.
• C99. Compiling with the --c99 option causes the compiler to conform to the ISO/IEC 9899:1999 C standard. This standard supports several features not part of C89, such as inline functions, new data types, and one-line comments beginning with //.
The C language is also described in the second edition of Kernighan and Ritchie's The C Programming Language (K&R).
• ISO-standard C++

The compiler uses the C++14 version of the C++ standard. Previously, C++03 was used. See the C++ Standard ISO/IEC 14882:2014. For a description of unsupported C++ features, see Section 7.2.

• ISO-standard run-time support

The compiler tools come with an extensive run-time library. Library functions conform to the ISO C/C++ library standard unless otherwise stated. The library includes functions for standard input and output, string manipulation, dynamic memory allocation, data conversion, timekeeping, trigonometry, and exponential and hyperbolic functions. Functions for signal handling are not included, because these are target-system specific. For more information, see Section 9.

See Section 7.13 for command line options to select the C or C++ standard your code uses.