Fortran 2003 status - The GNU Fortran 95 Compiler

Although gfortran focuses on implementing the Fortran 95 standard for the time being, a few Fortran 2003 features are currently available.

Intrinsics command_argument_count, get_command, get_command_argument, and get_environment_variable.
Array constructors using square brackets. That is, [...] rather than (/.../).
FLUSH statement.
IOMSG= specifier for I/O statements.
Support for the declaration of enumeration constants via the ENUM and ENUMERATOR statements. Interoperability with gcc is guaranteed also for the case where the -fshort-enums command line option is given.