3.3.3 Selecting specific standards
The specific language standard used by GCC can be controlled with the
-std option. The following C language standards are supported:
The original ANSI/ISO C language standard (ANSI X3.159-1989, ISO/IEC
9899:1990). GCC incorporates the corrections in the two ISO Technical
Corrigenda to the original standard.
The ISO C language standard with ISO Amendment 1, published in 1994.
This amendment was mainly concerned with internationalization, such as
adding support for multibyte characters to the C library.
The revised ISO C language standard, published in 1999 (ISO/IEC 9899:1999).
The C language standards with GNU extensions can be selected with the