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<title>The GNU Fortran Compiler: Fortran 2008 status</title>
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<a name="Fortran-2008-status"></a>
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<p>
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Next: <a href="TS-29113-status.html#TS-29113-status" accesskey="n" rel="next">TS 29113 status</a>, Previous: <a href="Fortran-2003-status.html#Fortran-2003-status" accesskey="p" rel="prev">Fortran 2003 status</a>, Up: <a href="Fortran-2003-and-2008-status.html#Fortran-2003-and-2008-status" accesskey="u" rel="up">Fortran 2003 and 2008 status</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Fortran-2008-status-1"></a>
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<h3 class="section">4.2 Fortran 2008 status</h3>
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<p>The latest version of the Fortran standard is ISO/IEC 1539-1:2010, informally
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known as Fortran 2008. The official version is available from International
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Organization for Standardization (ISO) or its national member organizations.
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The the final draft (FDIS) can be downloaded free of charge from
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<a href="http://www.nag.co.uk/sc22wg5/links.html">http://www.nag.co.uk/sc22wg5/links.html</a>. Fortran is developed by the
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Working Group 5 of Sub-Committee 22 of the Joint Technical Committee 1 of the
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International Organization for Standardization and the International
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Electrotechnical Commission (IEC). This group is known as
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<a href="http://www.nag.co.uk/sc22wg5/">WG5</a>.
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</p>
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<p>The GNU Fortran compiler supports several of the new features of Fortran 2008;
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the <a href="https://gcc.gnu.org/wiki/Fortran2008Status">wiki</a> has some information
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about the current Fortran 2008 implementation status. In particular, the
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following is implemented.
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</p>
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<ul>
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<li> The <samp>-std=f2008</samp> option and support for the file extensions
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<samp>.f08</samp> and <samp>.F08</samp>.
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</li><li> The <code>OPEN</code> statement now supports the <code>NEWUNIT=</code> option,
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which returns a unique file unit, thus preventing inadvertent use of the
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same unit in different parts of the program.
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</li><li> The <code>g0</code> format descriptor and unlimited format items.
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</li><li> The mathematical intrinsics <code>ASINH</code>, <code>ACOSH</code>, <code>ATANH</code>,
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<code>ERF</code>, <code>ERFC</code>, <code>GAMMA</code>, <code>LOG_GAMMA</code>, <code>BESSEL_J0</code>,
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<code>BESSEL_J1</code>, <code>BESSEL_JN</code>, <code>BESSEL_Y0</code>, <code>BESSEL_Y1</code>,
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<code>BESSEL_YN</code>, <code>HYPOT</code>, <code>NORM2</code>, and <code>ERFC_SCALED</code>.
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</li><li> Using complex arguments with <code>TAN</code>, <code>SINH</code>, <code>COSH</code>,
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<code>TANH</code>, <code>ASIN</code>, <code>ACOS</code>, and <code>ATAN</code> is now possible;
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<code>ATAN</code>(<var>Y</var>,<var>X</var>) is now an alias for <code>ATAN2</code>(<var>Y</var>,<var>X</var>).
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</li><li> Support of the <code>PARITY</code> intrinsic functions.
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</li><li> The following bit intrinsics: <code>LEADZ</code> and <code>TRAILZ</code> for
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counting the number of leading and trailing zero bits, <code>POPCNT</code> and
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<code>POPPAR</code> for counting the number of one bits and returning the parity;
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<code>BGE</code>, <code>BGT</code>, <code>BLE</code>, and <code>BLT</code> for bitwise comparisons;
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<code>DSHIFTL</code> and <code>DSHIFTR</code> for combined left and right shifts,
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<code>MASKL</code> and <code>MASKR</code> for simple left and right justified masks,
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<code>MERGE_BITS</code> for a bitwise merge using a mask, <code>SHIFTA</code>,
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<code>SHIFTL</code> and <code>SHIFTR</code> for shift operations, and the
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transformational bit intrinsics <code>IALL</code>, <code>IANY</code> and <code>IPARITY</code>.
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</li><li> Support of the <code>EXECUTE_COMMAND_LINE</code> intrinsic subroutine.
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</li><li> Support for the <code>STORAGE_SIZE</code> intrinsic inquiry function.
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</li><li> The <code>INT{8,16,32}</code> and <code>REAL{32,64,128}</code> kind type
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parameters and the array-valued named constants <code>INTEGER_KINDS</code>,
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<code>LOGICAL_KINDS</code>, <code>REAL_KINDS</code> and <code>CHARACTER_KINDS</code> of
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the intrinsic module <code>ISO_FORTRAN_ENV</code>.
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</li><li> The module procedures <code>C_SIZEOF</code> of the intrinsic module
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<code>ISO_C_BINDINGS</code> and <code>COMPILER_VERSION</code> and <code>COMPILER_OPTIONS</code>
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of <code>ISO_FORTRAN_ENV</code>.
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</li><li> Coarray support for serial programs with <samp>-fcoarray=single</samp> flag
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and experimental support for multiple images with the <samp>-fcoarray=lib</samp>
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flag.
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</li><li> Submodules are supported. It should noted that <code>MODULEs</code> do not
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produce the smod file needed by the descendent <code>SUBMODULEs</code> unless they
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contain at least one <code>MODULE PROCEDURE</code> interface. The reason for this is
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that <code>SUBMODULEs</code> are useless without <code>MODULE PROCEDUREs</code>. See
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http://j3-fortran.org/doc/meeting/207/15-209.txt for a discussion and a draft
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interpretation. Adopting this interpretation has the advantage that code that
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does not use submodules does not generate smod files.
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</li><li> The <code>DO CONCURRENT</code> construct is supported.
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</li><li> The <code>BLOCK</code> construct is supported.
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</li><li> The <code>STOP</code> and the new <code>ERROR STOP</code> statements now
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support all constant expressions. Both show the signals which were signaling
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at termination.
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</li><li> Support for the <code>CONTIGUOUS</code> attribute.
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</li><li> Support for <code>ALLOCATE</code> with <code>MOLD</code>.
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</li><li> Support for the <code>IMPURE</code> attribute for procedures, which
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allows for <code>ELEMENTAL</code> procedures without the restrictions of
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<code>PURE</code>.
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</li><li> Null pointers (including <code>NULL()</code>) and not-allocated variables
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can be used as actual argument to optional non-pointer, non-allocatable
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dummy arguments, denoting an absent argument.
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</li><li> Non-pointer variables with <code>TARGET</code> attribute can be used as
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actual argument to <code>POINTER</code> dummies with <code>INTENT(IN)</code>.
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</li><li> Pointers including procedure pointers and those in a derived
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type (pointer components) can now be initialized by a target instead
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of only by <code>NULL</code>.
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</li><li> The <code>EXIT</code> statement (with construct-name) can be now be
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used to leave not only the <code>DO</code> but also the <code>ASSOCIATE</code>,
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<code>BLOCK</code>, <code>IF</code>, <code>SELECT CASE</code> and <code>SELECT TYPE</code>
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constructs.
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</li><li> Internal procedures can now be used as actual argument.
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</li><li> Minor features: obsolesce diagnostics for <code>ENTRY</code> with
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<samp>-std=f2008</samp>; a line may start with a semicolon; for internal
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and module procedures <code>END</code> can be used instead of
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<code>END SUBROUTINE</code> and <code>END FUNCTION</code>; <code>SELECTED_REAL_KIND</code>
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now also takes a <code>RADIX</code> argument; intrinsic types are supported
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for <code>TYPE</code>(<var>intrinsic-type-spec</var>); multiple type-bound procedures
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can be declared in a single <code>PROCEDURE</code> statement; implied-shape
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arrays are supported for named constants (<code>PARAMETER</code>).
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</li></ul>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TS-29113-status.html#TS-29113-status" accesskey="n" rel="next">TS 29113 status</a>, Previous: <a href="Fortran-2003-status.html#Fortran-2003-status" accesskey="p" rel="prev">Fortran 2003 status</a>, Up: <a href="Fortran-2003-and-2008-status.html#Fortran-2003-and-2008-status" accesskey="u" rel="up">Fortran 2003 and 2008 status</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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