112 lines
5.3 KiB
HTML
112 lines
5.3 KiB
HTML
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(see below). A copy of the license is included in the section entitled
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A GNU Manual
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<head>
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<title>The GNU Fortran Compiler: Naming conventions</title>
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<meta name="description" content="The GNU Fortran Compiler: Naming conventions">
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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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<link href="Naming-and-argument_002dpassing-conventions.html#Naming-and-argument_002dpassing-conventions" rel="up" title="Naming and argument-passing conventions">
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<link href="Argument-passing-conventions.html#Argument-passing-conventions" rel="next" title="Argument passing conventions">
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<link href="Naming-and-argument_002dpassing-conventions.html#Naming-and-argument_002dpassing-conventions" rel="prev" title="Naming and argument-passing conventions">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Naming-conventions"></a>
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<div class="header">
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<p>
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Next: <a href="Argument-passing-conventions.html#Argument-passing-conventions" accesskey="n" rel="next">Argument passing conventions</a>, Up: <a href="Naming-and-argument_002dpassing-conventions.html#Naming-and-argument_002dpassing-conventions" accesskey="u" rel="up">Naming and argument-passing conventions</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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</div>
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<hr>
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<a name="Naming-conventions-1"></a>
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<h4 class="subsection">7.4.1 Naming conventions</h4>
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<p>According the Fortran standard, valid Fortran names consist of a letter
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between <code>A</code> to <code>Z</code>, <code>a</code> to <code>z</code>, digits <code>0</code>,
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<code>1</code> to <code>9</code> and underscores (<code>_</code>) with the restriction
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that names may only start with a letter. As vendor extension, the
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dollar sign (<code>$</code>) is additionally permitted with the option
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<samp>-fdollar-ok</samp>, but not as first character and only if the
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target system supports it.
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</p>
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<p>By default, the procedure name is the lower-cased Fortran name with an
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appended underscore (<code>_</code>); using <samp>-fno-underscoring</samp> no
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underscore is appended while <code>-fsecond-underscore</code> appends two
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underscores. Depending on the target system and the calling convention,
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the procedure might be additionally dressed; for instance, on 32bit
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Windows with <code>stdcall</code>, an at-sign <code>@</code> followed by an integer
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number is appended. For the changing the calling convention, see
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see <a href="GNU-Fortran-Compiler-Directives.html#GNU-Fortran-Compiler-Directives">GNU Fortran Compiler Directives</a>.
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</p>
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<p>For common blocks, the same convention is used, i.e. by default an
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underscore is appended to the lower-cased Fortran name. Blank commons
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have the name <code>__BLNK__</code>.
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</p>
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<p>For procedures and variables declared in the specification space of a
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module, the name is formed by <code>__</code>, followed by the lower-cased
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module name, <code>_MOD_</code>, and the lower-cased Fortran name. Note that
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no underscore is appended.
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</p>
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</body>
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</html>
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