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diff --git a/share/doc/gfortran/Fortran-Dialect-Options.html b/share/doc/gfortran/Fortran-Dialect-Options.html new file mode 100644 index 0000000..82ea4cb --- /dev/null +++ b/share/doc/gfortran/Fortran-Dialect-Options.html @@ -0,0 +1,485 @@ +<!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). 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The free form layout +was introduced in Fortran 90. Fixed form was traditionally used in +older Fortran programs. When neither option is specified, the source +form is determined by the file extension. +</p> +<a name="index-fall_002dintrinsics"></a> +</dd> +<dt><code>-fall-intrinsics</code></dt> +<dd><p>This option causes all intrinsic procedures (including the GNU-specific +extensions) to be accepted. This can be useful with <samp>-std=</samp> to +force standard-compliance but get access to the full range of intrinsics +available with <code>gfortran</code>. As a consequence, <samp>-Wintrinsics-std</samp> +will be ignored and no user-defined procedure with the same name as any +intrinsic will be called except when it is explicitly declared <code>EXTERNAL</code>. +</p> +<a name="index-fallow_002dargument_002dmismatch"></a> +</dd> +<dt><code>-fallow-argument-mismatch</code></dt> +<dd><p>Some code contains calls to external procedures with mismatches +between the calls and the procedure definition, or with mismatches +between different calls. Such code is non-conforming, and will usually +be flagged with an error. This options degrades the error to a +warning, which can only be disabled by disabling all warnings via +<samp>-w</samp>. Only a single occurrence per argument is flagged by this +warning. <samp>-fallow-argument-mismatch</samp> is implied by +<samp>-std=legacy</samp>. +</p> +<p>Using this option is <em>strongly</em> discouraged. It is possible to +provide standard-conforming code which allows different types of +arguments by using an explicit interface and <code>TYPE(*)</code>. +</p> +<a name="index-allow_002dinvalid_002dboz"></a> +</dd> +<dt><code>-fallow-invalid-boz</code></dt> +<dd><p>A BOZ literal constant can occur in a limited number of contexts in +standard conforming Fortran. This option degrades an error condition +to a warning, and allows a BOZ literal constant to appear where the +Fortran standard would otherwise prohibit its use. +</p> +<a name="index-fd_002dlines_002das_002dcode"></a> +<a name="index-fd_002dlines_002das_002dcomments"></a> +</dd> +<dt><code>-fd-lines-as-code</code></dt> +<dt><code>-fd-lines-as-comments</code></dt> +<dd><p>Enable special treatment for lines beginning with <code>d</code> or <code>D</code> +in fixed form sources. If the <samp>-fd-lines-as-code</samp> option is +given they are treated as if the first column contained a blank. If the +<samp>-fd-lines-as-comments</samp> option is given, they are treated as +comment lines. +</p> +<a name="index-fdec"></a> +</dd> +<dt><code>-fdec</code></dt> +<dd><p>DEC compatibility mode. Enables extensions and other features that mimic +the default behavior of older compilers (such as DEC). +These features are non-standard and should be avoided at all costs. +For details on GNU Fortran’s implementation of these extensions see the +full documentation. +</p> +<p>Other flags enabled by this switch are: +<samp>-fdollar-ok</samp> <samp>-fcray-pointer</samp> <samp>-fdec-char-conversions</samp> +<samp>-fdec-structure</samp> <samp>-fdec-intrinsic-ints</samp> <samp>-fdec-static</samp> +<samp>-fdec-math</samp> <samp>-fdec-include</samp> <samp>-fdec-blank-format-item</samp> +<samp>-fdec-format-defaults</samp> +</p> +<p>If <samp>-fd-lines-as-code</samp>/<samp>-fd-lines-as-comments</samp> are unset, then +<samp>-fdec</samp> also sets <samp>-fd-lines-as-comments</samp>. +</p> +<a name="index-fdec_002dchar_002dconversions"></a> +</dd> +<dt><code>-fdec-char-conversions</code></dt> +<dd><p>Enable the use of character literals in assignments and <code>DATA</code> statements +for non-character variables. +</p> +<a name="index-fdec_002dstructure"></a> +</dd> +<dt><code>-fdec-structure</code></dt> +<dd><p>Enable DEC <code>STRUCTURE</code> and <code>RECORD</code> as well as <code>UNION</code>, +<code>MAP</code>, and dot (’.’) as a member separator (in addition to ’%’). This is +provided for compatibility only; Fortran 90 derived types should be used +instead where possible. +</p> +<a name="index-fdec_002dintrinsic_002dints"></a> +</dd> +<dt><code>-fdec-intrinsic-ints</code></dt> +<dd><p>Enable B/I/J/K kind variants of existing integer functions (e.g. BIAND, IIAND, +JIAND, etc...). For a complete list of intrinsics see the full documentation. +</p> +<a name="index-fdec_002dmath"></a> +</dd> +<dt><code>-fdec-math</code></dt> +<dd><p>Enable legacy math intrinsics such as COTAN and degree-valued trigonometric +functions (e.g. TAND, ATAND, etc...) for compatability with older code. +</p> +<a name="index-fdec_002dstatic"></a> +</dd> +<dt><code>-fdec-static</code></dt> +<dd><p>Enable DEC-style STATIC and AUTOMATIC attributes to explicitly specify +the storage of variables and other objects. +</p> +<a name="index-fdec_002dinclude"></a> +</dd> +<dt><code>-fdec-include</code></dt> +<dd><p>Enable parsing of INCLUDE as a statement in addition to parsing it as +INCLUDE line. When parsed as INCLUDE statement, INCLUDE does not have to +be on a single line and can use line continuations. +</p> +<a name="index-fdec_002dformat_002ddefaults"></a> +</dd> +<dt><code>-fdec-format-defaults</code></dt> +<dd><p>Enable format specifiers F, G and I to be used without width specifiers, +default widths will be used instead. +</p> +<a name="index-fdec_002dblank_002dformat_002ditem"></a> +</dd> +<dt><code>-fdec-blank-format-item</code></dt> +<dd><p>Enable a blank format item at the end of a format specification i.e. nothing +following the final comma. +</p> +<a name="index-fdollar_002dok"></a> +<a name="index-_0024"></a> +<a name="index-symbol-names"></a> +<a name="index-character-set"></a> +</dd> +<dt><code>-fdollar-ok</code></dt> +<dd><p>Allow ‘<samp>$</samp>’ as a valid non-first character in a symbol name. Symbols +that start with ‘<samp>$</samp>’ are rejected since it is unclear which rules to +apply to implicit typing as different vendors implement different rules. +Using ‘<samp>$</samp>’ in <code>IMPLICIT</code> statements is also rejected. +</p> +<a name="index-backslash-1"></a> +<a name="index-backslash"></a> +<a name="index-escape-characters"></a> +</dd> +<dt><code>-fbackslash</code></dt> +<dd><p>Change the interpretation of backslashes in string literals from a single +backslash character to “C-style” escape characters. The following +combinations are expanded <code>\a</code>, <code>\b</code>, <code>\f</code>, <code>\n</code>, +<code>\r</code>, <code>\t</code>, <code>\v</code>, <code>\\</code>, and <code>\0</code> to the ASCII +characters alert, backspace, form feed, newline, carriage return, +horizontal tab, vertical tab, backslash, and NUL, respectively. +Additionally, <code>\x</code><var>nn</var>, <code>\u</code><var>nnnn</var> and +<code>\U</code><var>nnnnnnnn</var> (where each <var>n</var> is a hexadecimal digit) are +translated into the Unicode characters corresponding to the specified code +points. All other combinations of a character preceded by \ are +unexpanded. +</p> +<a name="index-fmodule_002dprivate"></a> +<a name="index-module-entities"></a> +<a name="index-private"></a> +</dd> +<dt><code>-fmodule-private</code></dt> +<dd><p>Set the default accessibility of module entities to <code>PRIVATE</code>. +Use-associated entities will not be accessible unless they are explicitly +declared as <code>PUBLIC</code>. +</p> +<a name="index-ffixed_002dline_002dlength_002dn"></a> +<a name="index-file-format_002c-fixed-1"></a> +</dd> +<dt><code>-ffixed-line-length-<var>n</var></code></dt> +<dd><p>Set column after which characters are ignored in typical fixed-form +lines in the source file, and, unless <code>-fno-pad-source</code>, through which +spaces are assumed (as if padded to that length) after the ends of short +fixed-form lines. +</p> +<p>Popular values for <var>n</var> include 72 (the +standard and the default), 80 (card image), and 132 (corresponding +to “extended-source” options in some popular compilers). +<var>n</var> may also be ‘<samp>none</samp>’, meaning that the entire line is meaningful +and that continued character constants never have implicit spaces appended +to them to fill out the line. +<samp>-ffixed-line-length-0</samp> means the same thing as +<samp>-ffixed-line-length-none</samp>. +</p> +<a name="index-fpad_002dsource"></a> +</dd> +<dt><code>-fno-pad-source</code></dt> +<dd><p>By default fixed-form lines have spaces assumed (as if padded to that length) +after the ends of short fixed-form lines. This is not done either if +<samp>-ffixed-line-length-0</samp>, <samp>-ffixed-line-length-none</samp> or +if <samp>-fno-pad-source</samp> option is used. With any of those options +continued character constants never have implicit spaces appended +to them to fill out the line. +</p> +<a name="index-ffree_002dline_002dlength_002dn"></a> +<a name="index-file-format_002c-free-1"></a> +</dd> +<dt><code>-ffree-line-length-<var>n</var></code></dt> +<dd><p>Set column after which characters are ignored in typical free-form +lines in the source file. The default value is 132. +<var>n</var> may be ‘<samp>none</samp>’, meaning that the entire line is meaningful. +<samp>-ffree-line-length-0</samp> means the same thing as +<samp>-ffree-line-length-none</samp>. +</p> +<a name="index-fmax_002didentifier_002dlength_003dn"></a> +</dd> +<dt><code>-fmax-identifier-length=<var>n</var></code></dt> +<dd><p>Specify the maximum allowed identifier length. Typical values are +31 (Fortran 95) and 63 (Fortran 2003 and later). +</p> +<a name="index-fimplicit_002dnone"></a> +</dd> +<dt><code>-fimplicit-none</code></dt> +<dd><p>Specify that no implicit typing is allowed, unless overridden by explicit +<code>IMPLICIT</code> statements. This is the equivalent of adding +<code>implicit none</code> to the start of every procedure. +</p> +<a name="index-fcray_002dpointer"></a> +</dd> +<dt><code>-fcray-pointer</code></dt> +<dd><p>Enable the Cray pointer extension, which provides C-like pointer +functionality. +</p> +<a name="index-fopenacc"></a> +<a name="index-OpenACC"></a> +</dd> +<dt><code>-fopenacc</code></dt> +<dd><p>Enable the OpenACC extensions. This includes OpenACC <code>!$acc</code> +directives in free form and <code>c$acc</code>, <code>*$acc</code> and +<code>!$acc</code> directives in fixed form, <code>!$</code> conditional +compilation sentinels in free form and <code>c$</code>, <code>*$</code> and +<code>!$</code> sentinels in fixed form, and when linking arranges for the +OpenACC runtime library to be linked in. +</p> +<a name="index-fopenmp"></a> +<a name="index-OpenMP"></a> +</dd> +<dt><code>-fopenmp</code></dt> +<dd><p>Enable the OpenMP extensions. This includes OpenMP <code>!$omp</code> directives +in free form +and <code>c$omp</code>, <code>*$omp</code> and <code>!$omp</code> directives in fixed form, +<code>!$</code> conditional compilation sentinels in free form +and <code>c$</code>, <code>*$</code> and <code>!$</code> sentinels in fixed form, +and when linking arranges for the OpenMP runtime library to be linked +in. The option <samp>-fopenmp</samp> implies <samp>-frecursive</samp>. +</p> +<a name="index-frange_002dcheck"></a> +</dd> +<dt><code>-fno-range-check</code></dt> +<dd><p>Disable range checking on results of simplification of constant +expressions during compilation. For example, GNU Fortran will give +an error at compile time when simplifying <code>a = 1. / 0</code>. +With this option, no error will be given and <code>a</code> will be assigned +the value <code>+Infinity</code>. If an expression evaluates to a value +outside of the relevant range of [<code>-HUGE()</code>:<code>HUGE()</code>], +then the expression will be replaced by <code>-Inf</code> or <code>+Inf</code> +as appropriate. +Similarly, <code>DATA i/Z'FFFFFFFF'/</code> will result in an integer overflow +on most systems, but with <samp>-fno-range-check</samp> the value will +“wrap around” and <code>i</code> will be initialized to <em>-1</em> instead. +</p> +<a name="index-fdefault_002dinteger_002d8"></a> +</dd> +<dt><code>-fdefault-integer-8</code></dt> +<dd><p>Set the default integer and logical types to an 8 byte wide type. This option +also affects the kind of integer constants like <code>42</code>. Unlike +<samp>-finteger-4-integer-8</samp>, it does not promote variables with explicit +kind declaration. +</p> +<a name="index-fdefault_002dreal_002d8"></a> +</dd> +<dt><code>-fdefault-real-8</code></dt> +<dd><p>Set the default real type to an 8 byte wide type. This option also affects +the kind of non-double real constants like <code>1.0</code>. This option promotes +the default width of <code>DOUBLE PRECISION</code> and double real constants +like <code>1.d0</code> to 16 bytes if possible. If <code>-fdefault-double-8</code> +is given along with <code>fdefault-real-8</code>, <code>DOUBLE PRECISION</code> +and double real constants are not promoted. Unlike <samp>-freal-4-real-8</samp>, +<code>fdefault-real-8</code> does not promote variables with explicit kind +declarations. +</p> +<a name="index-fdefault_002dreal_002d10"></a> +</dd> +<dt><code>-fdefault-real-10</code></dt> +<dd><p>Set the default real type to an 10 byte wide type. This option also affects +the kind of non-double real constants like <code>1.0</code>. This option promotes +the default width of <code>DOUBLE PRECISION</code> and double real constants +like <code>1.d0</code> to 16 bytes if possible. If <code>-fdefault-double-8</code> +is given along with <code>fdefault-real-10</code>, <code>DOUBLE PRECISION</code> +and double real constants are not promoted. Unlike <samp>-freal-4-real-10</samp>, +<code>fdefault-real-10</code> does not promote variables with explicit kind +declarations. +</p> +<a name="index-fdefault_002dreal_002d16"></a> +</dd> +<dt><code>-fdefault-real-16</code></dt> +<dd><p>Set the default real type to an 16 byte wide type. This option also affects +the kind of non-double real constants like <code>1.0</code>. This option promotes +the default width of <code>DOUBLE PRECISION</code> and double real constants +like <code>1.d0</code> to 16 bytes if possible. If <code>-fdefault-double-8</code> +is given along with <code>fdefault-real-16</code>, <code>DOUBLE PRECISION</code> +and double real constants are not promoted. Unlike <samp>-freal-4-real-16</samp>, +<code>fdefault-real-16</code> does not promote variables with explicit kind +declarations. +</p> +<a name="index-fdefault_002ddouble_002d8"></a> +</dd> +<dt><code>-fdefault-double-8</code></dt> +<dd><p>Set the <code>DOUBLE PRECISION</code> type and double real constants +like <code>1.d0</code> to an 8 byte wide type. Do nothing if this +is already the default. This option prevents <samp>-fdefault-real-8</samp>, +<samp>-fdefault-real-10</samp>, and <samp>-fdefault-real-16</samp>, +from promoting <code>DOUBLE PRECISION</code> and double real constants like +<code>1.d0</code> to 16 bytes. +</p> +<a name="index-finteger_002d4_002dinteger_002d8"></a> +</dd> +<dt><code>-finteger-4-integer-8</code></dt> +<dd><p>Promote all <code>INTEGER(KIND=4)</code> entities to an <code>INTEGER(KIND=8)</code> +entities. If <code>KIND=8</code> is unavailable, then an error will be issued. +This option should be used with care and may not be suitable for your codes. +Areas of possible concern include calls to external procedures, +alignment in <code>EQUIVALENCE</code> and/or <code>COMMON</code>, generic interfaces, +BOZ literal constant conversion, and I/O. Inspection of the intermediate +representation of the translated Fortran code, produced by +<samp>-fdump-tree-original</samp>, is suggested. +</p> +<a name="index-freal_002d4_002dreal_002d8"></a> +<a name="index-freal_002d4_002dreal_002d10"></a> +<a name="index-freal_002d4_002dreal_002d16"></a> +<a name="index-freal_002d8_002dreal_002d4"></a> +<a name="index-freal_002d8_002dreal_002d10"></a> +<a name="index-freal_002d8_002dreal_002d16"></a> +<a name="index-options_002c-real-kind-type-promotion"></a> +</dd> +<dt><code>-freal-4-real-8</code></dt> +<dt><code>-freal-4-real-10</code></dt> +<dt><code>-freal-4-real-16</code></dt> +<dt><code>-freal-8-real-4</code></dt> +<dt><code>-freal-8-real-10</code></dt> +<dt><code>-freal-8-real-16</code></dt> +<dd><p>Promote all <code>REAL(KIND=M)</code> entities to <code>REAL(KIND=N)</code> entities. +If <code>REAL(KIND=N)</code> is unavailable, then an error will be issued. +The <code>-freal-4-</code> flags also affect the default real kind and the +<code>-freal-8-</code> flags also the double-precision real kind. All other +real-kind types are unaffected by this option. The promotion is also +applied to real literal constants of default and double-precision kind +and a specified kind number of 4 or 8, respectively. +However, <code>-fdefault-real-8</code>, <code>-fdefault-real-10</code>, +<code>-fdefault-real-10</code>, and <code>-fdefault-double-8</code> take precedence +for the default and double-precision real kinds, both for real literal +constants and for declarations without a kind number. +Note that for <code>REAL(KIND=KIND(1.0))</code> the literal may get promoted and +then the result may get promoted again. +These options should be used with care and may not be suitable for your +codes. Areas of possible concern include calls to external procedures, +alignment in <code>EQUIVALENCE</code> and/or <code>COMMON</code>, generic interfaces, +BOZ literal constant conversion, and I/O and calls to intrinsic procedures +when passing a value to the <code>kind=</code> dummy argument. Inspection of the +intermediate representation of the translated Fortran code, produced by +<samp>-fdump-fortran-original</samp> or <samp>-fdump-tree-original</samp>, is suggested. +</p> +<a name="index-std_003dstd-option"></a> +</dd> +<dt><code>-std=<var>std</var></code></dt> +<dd><p>Specify the standard to which the program is expected to conform, +which may be one of ‘<samp>f95</samp>’, ‘<samp>f2003</samp>’, ‘<samp>f2008</samp>’, +‘<samp>f2018</samp>’, ‘<samp>gnu</samp>’, or ‘<samp>legacy</samp>’. The default value for +<var>std</var> is ‘<samp>gnu</samp>’, which specifies a superset of the latest +Fortran standard that includes all of the extensions supported by GNU +Fortran, although warnings will be given for obsolete extensions not +recommended for use in new code. The ‘<samp>legacy</samp>’ value is +equivalent but without the warnings for obsolete extensions, and may +be useful for old non-standard programs. The ‘<samp>f95</samp>’, +‘<samp>f2003</samp>’, ‘<samp>f2008</samp>’, and ‘<samp>f2018</samp>’ values specify strict +conformance to the Fortran 95, Fortran 2003, Fortran 2008 and Fortran +2018 standards, respectively; errors are given for all extensions +beyond the relevant language standard, and warnings are given for the +Fortran 77 features that are permitted but obsolescent in later +standards. The deprecated option ‘<samp>-std=f2008ts</samp>’ acts as an alias for +‘<samp>-std=f2018</samp>’. It is only present for backwards compatibility with +earlier gfortran versions and should not be used any more. +</p> +<a name="index-ftest_002dforall_002dtemp"></a> +</dd> +<dt><code>-ftest-forall-temp</code></dt> +<dd><p>Enhance test coverage by forcing most forall assignments to use temporary. +</p> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Preprocessing-Options.html#Preprocessing-Options" accesskey="n" rel="next">Preprocessing Options</a>, Previous: <a href="Option-Summary.html#Option-Summary" accesskey="p" rel="previous">Option Summary</a>, Up: <a href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" accesskey="u" rel="up">Invoking GNU Fortran</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> |