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| <a name="Naming-conventions-1"></a> |
| <h4 class="subsection">7.4.1 Naming conventions</h4> |
| |
| <p>According the Fortran standard, valid Fortran names consist of a letter |
| between <code>A</code> to <code>Z</code>, <code>a</code> to <code>z</code>, digits <code>0</code>, |
| <code>1</code> to <code>9</code> and underscores (<code>_</code>) with the restriction |
| that names may only start with a letter. As vendor extension, the |
| dollar sign (<code>$</code>) is additionally permitted with the option |
| <samp>-fdollar-ok</samp>, but not as first character and only if the |
| target system supports it. |
| </p> |
| <p>By default, the procedure name is the lower-cased Fortran name with an |
| appended underscore (<code>_</code>); using <samp>-fno-underscoring</samp> no |
| underscore is appended while <code>-fsecond-underscore</code> appends two |
| underscores. Depending on the target system and the calling convention, |
| the procedure might be additionally dressed; for instance, on 32bit |
| Windows with <code>stdcall</code>, an at-sign <code>@</code> followed by an integer |
| number is appended. For the changing the calling convention, see |
| see <a href="GNU-Fortran-Compiler-Directives.html#GNU-Fortran-Compiler-Directives">GNU Fortran Compiler Directives</a>. |
| </p> |
| <p>For common blocks, the same convention is used, i.e. by default an |
| underscore is appended to the lower-cased Fortran name. Blank commons |
| have the name <code>__BLNK__</code>. |
| </p> |
| <p>For procedures and variables declared in the specification space of a |
| module, the name is formed by <code>__</code>, followed by the lower-cased |
| module name, <code>_MOD_</code>, and the lower-cased Fortran name. Note that |
| no underscore is appended. |
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