• Fortran2003

Fortran 2003 Features in GNU Fortran

• Fortran Standards

• Fortran 2003 Meta Bug

• The New Features of Fortran 2003 by John Reid (older version)

• Chart of Fortran 2003 Features supported by GNU Fortran

For Fortran 2008 see below and at

• Chart of Fortran 2008 Features supported by GNU Fortran

Implemented

See also GFortran news and in the GNU Fortran manuals and note that the following list is incomplete.

• Command-line intrinsics

• Streaming IO

• ENUMERATION support

• Allocatable components and dummy arguments (TR 15581) and move_alloc

• USE statements with INTRINSIC and NON_INTRINSIC (since 2006-11-17)

• ISO_FORTRAN_ENV module (since 2006-11-20)

• VOLATILE attribute (since 2006-11-07)

• VALUE attribute (since 2006-12-03)

• IMPORT statement (since 2006-12-08)

• PROTECTED statement (since 2006-12-10)

• Intent for pointers (since 2007-01-05)

• Renaming operators on the USE statement (since 2007-03-08)

• ISO C Bindings (since 2007-07-02)

• MIN / MAX with character arguments (since 2007-08-06)

• Optional KIND= specifier: ACHAR, COUNT, IACHAR, ICHAR, INDEX, LBOUND, LEN, LEN_TRIM, SCAN, SIZE, UBOUND, VERIFY (since 2007-08-12), MAXLOC, MINLOC (since 2017-11-04, GCC 8.0.0)

• ABSTRACT INTERFACE (since 2007-08-18) and PROCEDURE statement (since 2007-09-04, without procedure pointers)

• Fortran 2003 BOZ, i.e. BOZ in INT, REAL, DBLE and CMPLX (since 2007-12-08)

• Asynchronous IO, (since 2008-05-2008 implemented as synchronous I/O, since 2018-08-21 (GCC 9.0.0)

• I/O changes: decimal=, sign=, delim=, pad=, blank=, round=, encoding=default and UTF-8 (since 2008-04-05)

• SELECTED_CHAR_KIND (since 2008-04-30; Fortran 2003 conforming, but no optional UCS-4 support)

• Structure constructures (since 2008-05-16)

• type-spec for array constructor (since 2008-05-16)

• Procedure Pointers (since 2008-07-02), as function results (since 2009-04-09)

• Procedure Pointer Components, with NOPASS (since 2009-05-06) and PASS (since 2009-07-25).

• Type extension (since 2008-07-29)

• Support for UCS-4 (ISO 10646) and I/O with encoding=UTF-8 encoding (since 2008-08-16)

• Type-bound procedures: PROCEDURE (since 2008-08-28), GENERIC (since 2008-08-31), as operators (since 2009-08-27)

• Abstract derived types: ABSTRACT, DEFERRED

• Allocatable scalars

• SELECT TYPE (since 2009-11-30)

• SAME_TYPE_AS and EXTENDS_TYPE_OF intrinsics (since 2009-11-30)

• polymorphic datatypes: Initial, experimental support, but problems with type-bound procedures (2009-11-30)

• ALLOCATE specifiers SOURCE= and ERRMSG=

• ASSOCIATE construct (partial implementation; since 2010-06-2010, updated 2010-08-17)

• Pointer Rank Remapping and setting of lower bounds (since 2010-08-19)

• Coarrays: partially implemented (for a single image) since April 2010, cf. Coarray

• Deferred-length character strings since 2011-01-28 (GCC 4.6)

• Reallocate on assignment since 2011-01-28 (GCC 4.6)

• Constructors, i.e. generic functions with the same name as derived types, since 2011-11-16 (GCC 4.7)

• Polymorphic arrays since 2011-12-11 (GCC 4.7)

• User Defined Derived-Type IO since 2016-08-31 (GCC 7.0.0)

• Parameterized derived types since 2017-09-09 (GCC 8.0.0)

• MAXLOC and MINLOC for character types since 2017-11-22 (GCC 8.0.0)

• MAXVAL and MINVAL for character types since 2017-12-03 (GCC 8.0.0)

Fortran 2008

• ASINH, ACOSH, ATANH, ERF, ERFC, GAMMA, LOG_GAMMA, BESSEL_*, HYPOT and ERFC_SCALED (missing are three-argument form of BESSEL_*N and norm2) since 2008-03-06
• g0 edit descriptor (since 2008-06-08).
• NEWUNIT= option for OPEN (since 2009-06-08).
• Unlimited format item (*(since 2009-08-19)).
• Experimental support of the BLOCK construct (since 2009-09-29).
• The complex versions of A{SIN,COS,TAN}{,H} (since GCC 4.5)
• Single-image coarray support (incomplete, since Mai 2010)

• CONTIGUOUS attribute (2010-06-21)

• Implied-shape arrays (2010-08-13)
• IMPURE (elemental) procedures (2010-08-15)

• DO CONCURRENT since 2011-09-08 (but without type-spec)

• IEEE intrinsic modules (TR15580, Fortran 2003 & 2008) since 2014-06-28

Unimplemented

Features supported by several other compilers

• Extended Formatted I/O specifiers i/o specifiers of non-default-kind, (PR29602)

Other features

Note: This list is by far incomplete.

• Finalization subroutines

• Non-initialization expr. as case-selector PR25104

Moving GNU Fortran towards the 2008 Standard

• submodules: Part of Fortran 2008 (draft) and of the technical report ISO/IEC TR 19767:2005 Fortran - Enhanced Module Facilities

• co-arrays: Missing parts such as a multi-image implementation, cf. Coarray