149 lines
5.4 KiB
HTML
149 lines
5.4 KiB
HTML
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<title>The GNU Fortran Compiler: Proposed Extensions</title>
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="Proposed-Extensions"></a>
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<div class="header">
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<p>
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Previous: <a href="Projects.html#Projects" accesskey="p" rel="prev">Projects</a>, Up: <a href="Contributing.html#Contributing" accesskey="u" rel="up">Contributing</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="Proposed-Extensions-1"></a>
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<h3 class="section">Proposed Extensions</h3>
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<p>Here’s a list of proposed extensions for the GNU Fortran compiler, in no particular
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order. Most of these are necessary to be fully compatible with
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existing Fortran compilers, but they are not part of the official
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J3 Fortran 95 standard.
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</p>
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<a name="Compiler-extensions_003a"></a>
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<h4 class="subsection">Compiler extensions:</h4>
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<ul>
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<li> User-specified alignment rules for structures.
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</li><li> Automatically extend single precision constants to double.
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</li><li> Compile code that conserves memory by dynamically allocating common and
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module storage either on stack or heap.
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</li><li> Compile flag to generate code for array conformance checking (suggest -CC).
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</li><li> User control of symbol names (underscores, etc).
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</li><li> Compile setting for maximum size of stack frame size before spilling
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parts to static or heap.
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</li><li> Flag to force local variables into static space.
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</li><li> Flag to force local variables onto stack.
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</li></ul>
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<a name="Environment-Options"></a>
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<h4 class="subsection">Environment Options</h4>
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<ul>
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<li> Pluggable library modules for random numbers, linear algebra.
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LA should use BLAS calling conventions.
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</li><li> Environment variables controlling actions on arithmetic exceptions like
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overflow, underflow, precision loss—Generate NaN, abort, default.
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action.
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</li><li> Set precision for fp units that support it (i387).
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</li><li> Variable for setting fp rounding mode.
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</li><li> Variable to fill uninitialized variables with a user-defined bit
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pattern.
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</li><li> Environment variable controlling filename that is opened for that unit
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number.
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</li><li> Environment variable to clear/trash memory being freed.
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</li><li> Environment variable to control tracing of allocations and frees.
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</li><li> Environment variable to display allocated memory at normal program end.
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</li><li> Environment variable for filename for * IO-unit.
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</li><li> Environment variable for temporary file directory.
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</li><li> Environment variable forcing standard output to be line buffered (Unix).
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</li></ul>
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