E VAX C Extensions Supported by DEC C

DEC C supports several VAX C extensions to ANSI-standard C. These extensions are recognized only when the VAX C compatibility option is used on the compiler command line. The VAX C extensions allow you to use the DEC C compiler to compile code originally written for the VAX C compiler.

The following sections describe the VAX C extensions available with the VAX C compatibility option. Extensions to the ANSI-standard C language are divided into two categories:

• Extensions compatible with ANSI C programs that produce diagnostic messages when compiled without the VAX C compatibility option

• Extensions incompatible with ANSI C programs, which could produce different compiler behavior when used without the VAX C compatibility option