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