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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gfortran/Non_002dFortran-Main-Program.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
Change-Id: I7303388733328cd98ab9aa3c30236db67f2e9e9c
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diff --git a/share/doc/gfortran/Non_002dFortran-Main-Program.html b/share/doc/gfortran/Non_002dFortran-Main-Program.html new file mode 100644 index 0000000..e2c34bf --- /dev/null +++ b/share/doc/gfortran/Non_002dFortran-Main-Program.html @@ -0,0 +1,136 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1999-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). A copy of the license is included in the section entitled +"GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + +A GNU Manual + +(b) The FSF's Back-Cover Text is: + +You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The GNU Fortran Compiler: Non-Fortran Main Program</title> + +<meta name="description" content="The GNU Fortran Compiler: Non-Fortran Main Program"> +<meta name="keywords" content="The GNU Fortran Compiler: Non-Fortran Main Program"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" rel="up" title="Mixed-Language Programming"> +<link href="_005fgfortran_005fset_005fargs.html#g_t_005fgfortran_005fset_005fargs" rel="next" title="_gfortran_set_args"> +<link href="NOVECTOR-directive.html#NOVECTOR-directive" rel="previous" title="NOVECTOR directive"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Non_002dFortran-Main-Program"></a> +<div class="header"> +<p> +Next: <a href="Naming-and-argument_002dpassing-conventions.html#Naming-and-argument_002dpassing-conventions" accesskey="n" rel="next">Naming and argument-passing conventions</a>, Previous: <a href="GNU-Fortran-Compiler-Directives.html#GNU-Fortran-Compiler-Directives" accesskey="p" rel="previous">GNU Fortran Compiler Directives</a>, Up: <a href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" accesskey="u" rel="up">Mixed-Language Programming</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> +</div> +<hr> +<a name="Non_002dFortran-Main-Program-1"></a> +<h3 class="section">6.3 Non-Fortran Main Program</h3> + +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005fargs.html#g_t_005fgfortran_005fset_005fargs" accesskey="1">_gfortran_set_args</a>:</td><td> </td><td align="left" valign="top">Save command-line arguments +</td></tr> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005foptions.html#g_t_005fgfortran_005fset_005foptions" accesskey="2">_gfortran_set_options</a>:</td><td> </td><td align="left" valign="top">Set library option flags +</td></tr> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005fconvert.html#g_t_005fgfortran_005fset_005fconvert" accesskey="3">_gfortran_set_convert</a>:</td><td> </td><td align="left" valign="top">Set endian conversion +</td></tr> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005frecord_005fmarker.html#g_t_005fgfortran_005fset_005frecord_005fmarker" accesskey="4">_gfortran_set_record_marker</a>:</td><td> </td><td align="left" valign="top">Set length of record markers +</td></tr> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005ffpe.html#g_t_005fgfortran_005fset_005ffpe" accesskey="5">_gfortran_set_fpe</a>:</td><td> </td><td align="left" valign="top">Set when a Floating Point Exception should be raised +</td></tr> +<tr><td align="left" valign="top">• <a href="_005fgfortran_005fset_005fmax_005fsubrecord_005flength.html#g_t_005fgfortran_005fset_005fmax_005fsubrecord_005flength" accesskey="6">_gfortran_set_max_subrecord_length</a>:</td><td> </td><td align="left" valign="top">Set subrecord length +</td></tr> +</table> + +<p>Even if you are doing mixed-language programming, it is very +likely that you do not need to know or use the information in this +section. Since it is about the internal structure of GNU Fortran, +it may also change in GCC minor releases. +</p> +<p>When you compile a <code>PROGRAM</code> with GNU Fortran, a function +with the name <code>main</code> (in the symbol table of the object file) +is generated, which initializes the libgfortran library and then +calls the actual program which uses the name <code>MAIN__</code>, for +historic reasons. If you link GNU Fortran compiled procedures +to, e.g., a C or C++ program or to a Fortran program compiled by +a different compiler, the libgfortran library is not initialized +and thus a few intrinsic procedures do not work properly, e.g. +those for obtaining the command-line arguments. +</p> +<p>Therefore, if your <code>PROGRAM</code> is not compiled with +GNU Fortran and the GNU Fortran compiled procedures require +intrinsics relying on the library initialization, you need to +initialize the library yourself. Using the default options, +gfortran calls <code>_gfortran_set_args</code> and +<code>_gfortran_set_options</code>. The initialization of the former +is needed if the called procedures access the command line +(and for backtracing); the latter sets some flags based on the +standard chosen or to enable backtracing. In typical programs, +it is not necessary to call any initialization function. +</p> +<p>If your <code>PROGRAM</code> is compiled with GNU Fortran, you shall +not call any of the following functions. The libgfortran +initialization functions are shown in C syntax but using C +bindings they are also accessible from Fortran. +</p> + +<hr> +<div class="header"> +<p> +Next: <a href="Naming-and-argument_002dpassing-conventions.html#Naming-and-argument_002dpassing-conventions" accesskey="n" rel="next">Naming and argument-passing conventions</a>, Previous: <a href="GNU-Fortran-Compiler-Directives.html#GNU-Fortran-Compiler-Directives" accesskey="p" rel="previous">GNU Fortran Compiler Directives</a>, Up: <a href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" accesskey="u" rel="up">Mixed-Language Programming</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> +</div> + + + +</body> +</html> |