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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) | |
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diff --git a/share/doc/gccint/Option-properties.html b/share/doc/gccint/Option-properties.html new file mode 100644 index 0000000..892d7c1 --- /dev/null +++ b/share/doc/gccint/Option-properties.html @@ -0,0 +1,515 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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>GNU Compiler Collection (GCC) Internals: Option properties</title> + +<meta name="description" content="GNU Compiler Collection (GCC) Internals: Option properties"> +<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Option properties"> +<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="Options.html#Options" rel="up" title="Options"> +<link href="Passes.html#Passes" rel="next" title="Passes"> +<link href="Option-file-format.html#Option-file-format" rel="previous" title="Option file format"> +<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="Option-properties"></a> +<div class="header"> +<p> +Previous: <a href="Option-file-format.html#Option-file-format" accesskey="p" rel="previous">Option file format</a>, Up: <a href="Options.html#Options" accesskey="u" rel="up">Options</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="Option-properties-1"></a> +<h3 class="section">8.2 Option properties</h3> + +<p>The second field of an option record can specify any of the following +properties. When an option takes an argument, it is enclosed in parentheses +following the option property name. The parser that handles option files +is quite simplistic, and will be tricked by any nested parentheses within +the argument text itself; in this case, the entire option argument can +be wrapped in curly braces within the parentheses to demarcate it, e.g.: +</p> +<div class="smallexample"> +<pre class="smallexample">Condition({defined (USE_CYGWIN_LIBSTDCXX_WRAPPERS)}) +</pre></div> + +<dl compact="compact"> +<dt><code>Common</code></dt> +<dd><p>The option is available for all languages and targets. +</p> +</dd> +<dt><code>Target</code></dt> +<dd><p>The option is available for all languages but is target-specific. +</p> +</dd> +<dt><code>Driver</code></dt> +<dd><p>The option is handled by the compiler driver using code not shared +with the compilers proper (<samp>cc1</samp> etc.). +</p> +</dd> +<dt><code><var>language</var></code></dt> +<dd><p>The option is available when compiling for the given language. +</p> +<p>It is possible to specify several different languages for the same +option. Each <var>language</var> must have been declared by an earlier +<code>Language</code> record. See <a href="Option-file-format.html#Option-file-format">Option file format</a>. +</p> +</dd> +<dt><code>RejectDriver</code></dt> +<dd><p>The option is only handled by the compilers proper (<samp>cc1</samp> etc.) +and should not be accepted by the driver. +</p> +</dd> +<dt><code>RejectNegative</code></dt> +<dd><p>The option does not have a “no-” form. All options beginning with +“f”, “g”, “W” or “m” are assumed to have a “no-” form unless +this property is used. +</p> +</dd> +<dt><code>Negative(<var>othername</var>)</code></dt> +<dd><p>The option will turn off another option <var>othername</var>, which is +the option name with the leading “-” removed. This chain action will +propagate through the <code>Negative</code> property of the option to be +turned off. The driver will prune options, removing those that are +turned off by some later option. This pruning is not done for options +with <code>Joined</code> or <code>JoinedOrMissing</code> properties, unless the +options have both the <code>RejectNegative</code> property and the <code>Negative</code> +property mentions itself. +</p> +<p>As a consequence, if you have a group of mutually-exclusive +options, their <code>Negative</code> properties should form a circular chain. +For example, if options <samp>-<var>a</var></samp>, <samp>-<var>b</var></samp> and +<samp>-<var>c</var></samp> are mutually exclusive, their respective <code>Negative</code> +properties should be ‘<samp>Negative(<var>b</var>)</samp>’, ‘<samp>Negative(<var>c</var>)</samp>’ +and ‘<samp>Negative(<var>a</var>)</samp>’. +</p> +</dd> +<dt><code>Joined</code></dt> +<dt><code>Separate</code></dt> +<dd><p>The option takes a mandatory argument. <code>Joined</code> indicates +that the option and argument can be included in the same <code>argv</code> +entry (as with <code>-mflush-func=<var>name</var></code>, for example). +<code>Separate</code> indicates that the option and argument can be +separate <code>argv</code> entries (as with <code>-o</code>). An option is +allowed to have both of these properties. +</p> +</dd> +<dt><code>JoinedOrMissing</code></dt> +<dd><p>The option takes an optional argument. If the argument is given, +it will be part of the same <code>argv</code> entry as the option itself. +</p> +<p>This property cannot be used alongside <code>Joined</code> or <code>Separate</code>. +</p> +</dd> +<dt><code>MissingArgError(<var>message</var>)</code></dt> +<dd><p>For an option marked <code>Joined</code> or <code>Separate</code>, the message +<var>message</var> will be used as an error message if the mandatory +argument is missing; for options without <code>MissingArgError</code>, a +generic error message is used. <var>message</var> should contain a single +‘<samp>%qs</samp>’ format, which will be used to format the name of the option +passed. +</p> +</dd> +<dt><code>Args(<var>n</var>)</code></dt> +<dd><p>For an option marked <code>Separate</code>, indicate that it takes <var>n</var> +arguments. The default is 1. +</p> +</dd> +<dt><code>UInteger</code></dt> +<dd><p>The option’s argument is a non-negative integer consisting of either +decimal or hexadecimal digits interpreted as <code>int</code>. Hexadecimal +integers may optionally start with the <code>0x</code> or <code>0X</code> prefix. +The option parser validates and converts the argument before passing +it to the relevant option handler. <code>UInteger</code> should also be used +with options like <code>-falign-loops</code> where both <code>-falign-loops</code> +and <code>-falign-loops</code>=<var>n</var> are supported to make sure the saved +options are given a full integer. Positive values of the argument in +excess of <code>INT_MAX</code> wrap around zero. +</p> +</dd> +<dt><code>Host_Wide_Int</code></dt> +<dd><p>The option’s argument is a non-negative integer consisting of either +decimal or hexadecimal digits interpreted as the widest integer type +on the host. As with an <code>UInteger</code> argument, hexadecimal integers +may optionally start with the <code>0x</code> or <code>0X</code> prefix. The option +parser validates and converts the argument before passing it to +the relevant option handler. <code>Host_Wide_Int</code> should be used with +options that need to accept very large values. Positive values of +the argument in excess of <code>HOST_WIDE_INT_M1U</code> are assigned +<code>HOST_WIDE_INT_M1U</code>. +</p> +</dd> +<dt><code>IntegerRange(<var>n</var>, <var>m</var>)</code></dt> +<dd><p>The options’s arguments are integers of type <code>int</code>. The option’s +parser validates that the value of an option integer argument is within +the closed range [<var>n</var>, <var>m</var>]. +</p> +</dd> +<dt><code>ByteSize</code></dt> +<dd><p>A property applicable only to <code>UInteger</code> or <code>Host_Wide_Int</code> +arguments. The option’s integer argument is interpreted as if in infinite +precision using saturation arithmetic in the corresponding type. The argument +may be followed by a ‘<samp>byte-size</samp>’ suffix designating a multiple of bytes +such as <code>kB</code> and <code>KiB</code> for kilobyte and kibibyte, respectively, +<code>MB</code> and <code>MiB</code> for megabyte and mebibyte, <code>GB</code> and <code>GiB</code> +for gigabyte and gigibyte, and so on. <code>ByteSize</code> should be used for +with options that take a very large argument representing a size in bytes, +such as <samp>-Wlarger-than=</samp>. +</p> +</dd> +<dt><code>ToLower</code></dt> +<dd><p>The option’s argument should be converted to lowercase as part of +putting it in canonical form, and before comparing with the strings +indicated by any <code>Enum</code> property. +</p> +</dd> +<dt><code>NoDriverArg</code></dt> +<dd><p>For an option marked <code>Separate</code>, the option only takes an +argument in the compiler proper, not in the driver. This is for +compatibility with existing options that are used both directly and +via <samp>-Wp,</samp>; new options should not have this property. +</p> +</dd> +<dt><code>Var(<var>var</var>)</code></dt> +<dd><p>The state of this option should be stored in variable <var>var</var> +(actually a macro for <code>global_options.x_<var>var</var></code>). +The way that the state is stored depends on the type of option: +</p> +<ul> +<li> If the option uses the <code>Mask</code> or <code>InverseMask</code> properties, +<var>var</var> is the integer variable that contains the mask. + +</li><li> If the option is a normal on/off switch, <var>var</var> is an integer +variable that is nonzero when the option is enabled. The options +parser will set the variable to 1 when the positive form of the +option is used and 0 when the “no-” form is used. + +</li><li> If the option takes an argument and has the <code>UInteger</code> property, +<var>var</var> is an integer variable that stores the value of the argument. + +</li><li> If the option takes an argument and has the <code>Enum</code> property, +<var>var</var> is a variable (type given in the <code>Type</code> property of the +‘<samp>Enum</samp>’ record whose <code>Name</code> property has the same argument as +the <code>Enum</code> property of this option) that stores the value of the +argument. + +</li><li> If the option has the <code>Defer</code> property, <var>var</var> is a pointer to +a <code>VEC(cl_deferred_option,heap)</code> that stores the option for later +processing. (<var>var</var> is declared with type <code>void *</code> and needs +to be cast to <code>VEC(cl_deferred_option,heap)</code> before use.) + +</li><li> Otherwise, if the option takes an argument, <var>var</var> is a pointer to +the argument string. The pointer will be null if the argument is optional +and wasn’t given. +</li></ul> + +<p>The option-processing script will usually zero-initialize <var>var</var>. +You can modify this behavior using <code>Init</code>. +</p> +</dd> +<dt><code>Var(<var>var</var>, <var>set</var>)</code></dt> +<dd><p>The option controls an integer variable <var>var</var> and is active when +<var>var</var> equals <var>set</var>. The option parser will set <var>var</var> to +<var>set</var> when the positive form of the option is used and <code>!<var>set</var></code> +when the “no-” form is used. +</p> +<p><var>var</var> is declared in the same way as for the single-argument form +described above. +</p> +</dd> +<dt><code>Init(<var>value</var>)</code></dt> +<dd><p>The variable specified by the <code>Var</code> property should be statically +initialized to <var>value</var>. If more than one option using the same +variable specifies <code>Init</code>, all must specify the same initializer. +</p> +</dd> +<dt><code>WarnRemoved</code></dt> +<dd><p>The option is removed and every usage of such option will +result in a warning. We use it option backward compatibility. +</p> +</dd> +<dt><code>Mask(<var>name</var>)</code></dt> +<dd><p>The option is associated with a bit in the <code>target_flags</code> +variable (see <a href="Run_002dtime-Target.html#Run_002dtime-Target">Run-time Target</a>) and is active when that bit is set. +You may also specify <code>Var</code> to select a variable other than +<code>target_flags</code>. +</p> +<p>The options-processing script will automatically allocate a unique bit +for the option. If the option is attached to ‘<samp>target_flags</samp>’, +the script will set the macro <code>MASK_<var>name</var></code> to the appropriate +bitmask. It will also declare a <code>TARGET_<var>name</var></code> macro that has +the value 1 when the option is active and 0 otherwise. If you use <code>Var</code> +to attach the option to a different variable, the bitmask macro with be +called <code>OPTION_MASK_<var>name</var></code>. +</p> +</dd> +<dt><code>InverseMask(<var>othername</var>)</code></dt> +<dt><code>InverseMask(<var>othername</var>, <var>thisname</var>)</code></dt> +<dd><p>The option is the inverse of another option that has the +<code>Mask(<var>othername</var>)</code> property. If <var>thisname</var> is given, +the options-processing script will declare a <code>TARGET_<var>thisname</var></code> +macro that is 1 when the option is active and 0 otherwise. +</p> +</dd> +<dt><code>Enum(<var>name</var>)</code></dt> +<dd><p>The option’s argument is a string from the set of strings associated +with the corresponding ‘<samp>Enum</samp>’ record. The string is checked and +converted to the integer specified in the corresponding +‘<samp>EnumValue</samp>’ record before being passed to option handlers. +</p> +</dd> +<dt><code>EnumSet</code></dt> +<dd><p>Must be used together with the <code>Enum(<var>name</var>)</code> property. +Corresponding ‘<samp>Enum</samp>’ record must use <code>Set</code> properties. +The option’s argument is either a string from the set like for +<code>Enum(<var>name</var>)</code>, but with a slightly different behavior that +the whole <code>Var</code> isn’t overwritten, but only the bits in all the +enumeration values with the same set bitwise ored together. +Or option’s argument can be a comma separated list of strings where +each string is from a different <code>Set(<var>number</var>)</code>. +</p> +</dd> +<dt><code>EnumBitSet</code></dt> +<dd><p>Must be used together with the <code>Enum(<var>name</var>)</code> property. +Similar to ‘<samp>EnumSet</samp>’, but corresponding ‘<samp>Enum</samp>’ record must +not use <code>Set</code> properties, each <code>EnumValue</code> should have +<code>Value</code> that is a power of 2, each value is treated as its own +set and its value as the set’s mask, so there are no mutually +exclusive arguments. +</p> +</dd> +<dt><code>Defer</code></dt> +<dd><p>The option should be stored in a vector, specified with <code>Var</code>, +for later processing. +</p> +</dd> +<dt><code>Alias(<var>opt</var>)</code></dt> +<dt><code>Alias(<var>opt</var>, <var>arg</var>)</code></dt> +<dt><code>Alias(<var>opt</var>, <var>posarg</var>, <var>negarg</var>)</code></dt> +<dd><p>The option is an alias for <samp>-<var>opt</var></samp> (or the negative form +of that option, depending on <code>NegativeAlias</code>). In the first form, +any argument passed to the alias is considered to be passed to +<samp>-<var>opt</var></samp>, and <samp>-<var>opt</var></samp> is considered to be +negated if the alias is used in negated form. In the second form, the +alias may not be negated or have an argument, and <var>posarg</var> is +considered to be passed as an argument to <samp>-<var>opt</var></samp>. In the +third form, the alias may not have an argument, if the alias is used +in the positive form then <var>posarg</var> is considered to be passed to +<samp>-<var>opt</var></samp>, and if the alias is used in the negative form +then <var>negarg</var> is considered to be passed to <samp>-<var>opt</var></samp>. +</p> +<p>Aliases should not specify <code>Var</code> or <code>Mask</code> or +<code>UInteger</code>. Aliases should normally specify the same languages +as the target of the alias; the flags on the target will be used to +determine any diagnostic for use of an option for the wrong language, +while those on the alias will be used to identify what command-line +text is the option and what text is any argument to that option. +</p> +<p>When an <code>Alias</code> definition is used for an option, driver specs do +not need to handle it and no ‘<samp>OPT_</samp>’ enumeration value is defined +for it; only the canonical form of the option will be seen in those +places. +</p> +</dd> +<dt><code>NegativeAlias</code></dt> +<dd><p>For an option marked with <code>Alias(<var>opt</var>)</code>, the option is +considered to be an alias for the positive form of <samp>-<var>opt</var></samp> +if negated and for the negative form of <samp>-<var>opt</var></samp> if not +negated. <code>NegativeAlias</code> may not be used with the forms of +<code>Alias</code> taking more than one argument. +</p> +</dd> +<dt><code>Ignore</code></dt> +<dd><p>This option is ignored apart from printing any warning specified using +<code>Warn</code>. The option will not be seen by specs and no ‘<samp>OPT_</samp>’ +enumeration value is defined for it. +</p> +</dd> +<dt><code>SeparateAlias</code></dt> +<dd><p>For an option marked with <code>Joined</code>, <code>Separate</code> and +<code>Alias</code>, the option only acts as an alias when passed a separate +argument; with a joined argument it acts as a normal option, with an +‘<samp>OPT_</samp>’ enumeration value. This is for compatibility with the +Java <samp>-d</samp> option and should not be used for new options. +</p> +</dd> +<dt><code>Warn(<var>message</var>)</code></dt> +<dd><p>If this option is used, output the warning <var>message</var>. +<var>message</var> is a format string, either taking a single operand with +a ‘<samp>%qs</samp>’ format which is the option name, or not taking any +operands, which is passed to the ‘<samp>warning</samp>’ function. If an alias +is marked <code>Warn</code>, the target of the alias must not also be marked +<code>Warn</code>. +</p> +</dd> +<dt><code>Warning</code></dt> +<dd><p>This is a warning option and should be shown as such in +<samp>--help</samp> output. This flag does not currently affect anything +other than <samp>--help</samp>. +</p> +</dd> +<dt><code>Optimization</code></dt> +<dd><p>This is an optimization option. It should be shown as such in +<samp>--help</samp> output, and any associated variable named using +<code>Var</code> should be saved and restored when the optimization level is +changed with <code>optimize</code> attributes. +</p> +</dd> +<dt><code>PerFunction</code></dt> +<dd><p>This is an option that can be overridden on a per-function basis. +<code>Optimization</code> implies <code>PerFunction</code>, but options that do not +affect executable code generation may use this flag instead, so that the +option is not taken into account in ways that might affect executable +code generation. +</p> +</dd> +<dt><code>Param</code></dt> +<dd><p>This is an option that is a parameter. +</p> +</dd> +<dt><code>Undocumented</code></dt> +<dd><p>The option is deliberately missing documentation and should not +be included in the <samp>--help</samp> output. +</p> +</dd> +<dt><code>Condition(<var>cond</var>)</code></dt> +<dd><p>The option should only be accepted if preprocessor condition +<var>cond</var> is true. Note that any C declarations associated with the +option will be present even if <var>cond</var> is false; <var>cond</var> simply +controls whether the option is accepted and whether it is printed in +the <samp>--help</samp> output. +</p> +</dd> +<dt><code>Save</code></dt> +<dd><p>Build the <code>cl_target_option</code> structure to hold a copy of the +option, add the functions <code>cl_target_option_save</code> and +<code>cl_target_option_restore</code> to save and restore the options. +</p> +</dd> +<dt><code>SetByCombined</code></dt> +<dd><p>The option may also be set by a combined option such as +<samp>-ffast-math</samp>. This causes the <code>gcc_options</code> struct to +have a field <code>frontend_set_<var>name</var></code>, where <code><var>name</var></code> +is the name of the field holding the value of this option (without the +leading <code>x_</code>). This gives the front end a way to indicate that +the value has been set explicitly and should not be changed by the +combined option. For example, some front ends use this to prevent +<samp>-ffast-math</samp> and <samp>-fno-fast-math</samp> from changing the +value of <samp>-fmath-errno</samp> for languages that do not use +<code>errno</code>. +</p> +</dd> +<dt><code>EnabledBy(<var>opt</var>)</code></dt> +<dt><code>EnabledBy(<var>opt</var> || <var>opt2</var>)</code></dt> +<dt><code>EnabledBy(<var>opt</var> && <var>opt2</var>)</code></dt> +<dd><p>If not explicitly set, the option is set to the value of +<samp>-<var>opt</var></samp>; multiple options can be given, separated by +<code>||</code>. The third form using <code>&&</code> specifies that the option is +only set if both <var>opt</var> and <var>opt2</var> are set. The options <var>opt</var> +and <var>opt2</var> must have the <code>Common</code> property; otherwise, use +<code>LangEnabledBy</code>. +</p> +</dd> +<dt><code>LangEnabledBy(<var>language</var>, <var>opt</var>)</code></dt> +<dt><code>LangEnabledBy(<var>language</var>, <var>opt</var>, <var>posarg</var>, <var>negarg</var>)</code></dt> +<dd><p>When compiling for the given language, the option is set to the value +of <samp>-<var>opt</var></samp>, if not explicitly set. <var>opt</var> can be also a list +of <code>||</code> separated options. In the second form, if +<var>opt</var> is used in the positive form then <var>posarg</var> is considered +to be passed to the option, and if <var>opt</var> is used in the negative +form then <var>negarg</var> is considered to be passed to the option. It +is possible to specify several different languages. Each +<var>language</var> must have been declared by an earlier <code>Language</code> +record. See <a href="Option-file-format.html#Option-file-format">Option file format</a>. +</p> +</dd> +<dt><code>NoDWARFRecord</code></dt> +<dd><p>The option is omitted from the producer string written by +<samp>-grecord-gcc-switches</samp>. +</p> +</dd> +<dt><code>PchIgnore</code></dt> +<dd><p>Even if this is a target option, this option will not be recorded / compared +to determine if a precompiled header file matches. +</p> +</dd> +<dt><code>CPP(<var>var</var>)</code></dt> +<dd><p>The state of this option should be kept in sync with the preprocessor +option <var>var</var>. If this property is set, then properties <code>Var</code> +and <code>Init</code> must be set as well. +</p> +</dd> +<dt><code>CppReason(<var>CPP_W_Enum</var>)</code></dt> +<dd><p>This warning option corresponds to <code>cpplib.h</code> warning reason code +<var>CPP_W_Enum</var>. This should only be used for warning options of the +C-family front-ends. +</p> +</dd> +</dl> + + +<hr> +<div class="header"> +<p> +Previous: <a href="Option-file-format.html#Option-file-format" accesskey="p" rel="previous">Option file format</a>, Up: <a href="Options.html#Options" accesskey="u" rel="up">Options</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> |