Mercurial > hg > CbC > CbC_gcc
annotate gcc/doc/options.texi @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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111 | 1 @c Copyright (C) 2003-2017 Free Software Foundation, Inc. |
0 | 2 @c This is part of the GCC manual. |
3 @c For copying conditions, see the file gcc.texi. | |
4 | |
5 @node Options | |
6 @chapter Option specification files | |
7 @cindex option specification files | |
8 @cindex @samp{optc-gen.awk} | |
9 | |
10 Most GCC command-line options are described by special option | |
11 definition files, the names of which conventionally end in | |
12 @code{.opt}. This chapter describes the format of these files. | |
13 | |
14 @menu | |
15 * Option file format:: The general layout of the files | |
16 * Option properties:: Supported option properties | |
17 @end menu | |
18 | |
19 @node Option file format | |
20 @section Option file format | |
21 | |
22 Option files are a simple list of records in which each field occupies | |
23 its own line and in which the records themselves are separated by | |
24 blank lines. Comments may appear on their own line anywhere within | |
25 the file and are preceded by semicolons. Whitespace is allowed before | |
26 the semicolon. | |
27 | |
28 The files can contain the following types of record: | |
29 | |
30 @itemize @bullet | |
31 @item | |
32 A language definition record. These records have two fields: the | |
33 string @samp{Language} and the name of the language. Once a language | |
34 has been declared in this way, it can be used as an option property. | |
35 @xref{Option properties}. | |
36 | |
37 @item | |
38 A target specific save record to save additional information. These | |
39 records have two fields: the string @samp{TargetSave}, and a | |
40 declaration type to go in the @code{cl_target_option} structure. | |
41 | |
42 @item | |
67
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43 A variable record to define a variable used to store option |
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44 information. These records have two fields: the string |
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45 @samp{Variable}, and a declaration of the type and name of the |
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46 variable, optionally with an initializer (but without any trailing |
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47 @samp{;}). These records may be used for variables used for many |
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48 options where declaring the initializer in a single option definition |
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49 record, or duplicating it in many records, would be inappropriate, or |
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50 for variables set in option handlers rather than referenced by |
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51 @code{Var} properties. |
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52 |
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53 @item |
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54 A variable record to define a variable used to store option |
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55 information. These records have two fields: the string |
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56 @samp{TargetVariable}, and a declaration of the type and name of the |
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57 variable, optionally with an initializer (but without any trailing |
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58 @samp{;}). @samp{TargetVariable} is a combination of @samp{Variable} |
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59 and @samp{TargetSave} records in that the variable is defined in the |
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60 @code{gcc_options} structure, but these variables are also stored in |
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61 the @code{cl_target_option} structure. The variables are saved in the |
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62 target save code and restored in the target restore code. |
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63 |
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64 @item |
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65 A variable record to record any additional files that the |
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66 @file{options.h} file should include. This is useful to provide |
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67 enumeration or structure definitions needed for target variables. |
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68 These records have two fields: the string @samp{HeaderInclude} and the |
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69 name of the include file. |
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70 |
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71 @item |
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72 A variable record to record any additional files that the |
111 | 73 @file{options.c} or @file{options-save.c} file should include. This |
74 is useful to provide | |
67
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75 inline functions needed for target variables and/or @code{#ifdef} |
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76 sequences to properly set up the initialization. These records have |
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77 two fields: the string @samp{SourceInclude} and the name of the |
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78 include file. |
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79 |
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80 @item |
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81 An enumeration record to define a set of strings that may be used as |
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82 arguments to an option or options. These records have three fields: |
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83 the string @samp{Enum}, a space-separated list of properties and help |
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84 text used to describe the set of strings in @option{--help} output. |
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85 Properties use the same format as option properties; the following are |
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86 valid: |
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87 @table @code |
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88 @item Name(@var{name}) |
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89 This property is required; @var{name} must be a name (suitable for use |
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90 in C identifiers) used to identify the set of strings in @code{Enum} |
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91 option properties. |
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92 |
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93 @item Type(@var{type}) |
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94 This property is required; @var{type} is the C type for variables set |
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95 by options using this enumeration together with @code{Var}. |
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96 |
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97 @item UnknownError(@var{message}) |
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98 The message @var{message} will be used as an error message if the |
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99 argument is invalid; for enumerations without @code{UnknownError}, a |
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100 generic error message is used. @var{message} should contain a single |
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101 @samp{%qs} format, which will be used to format the invalid argument. |
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102 @end table |
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103 |
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104 @item |
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105 An enumeration value record to define one of the strings in a set |
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106 given in an @samp{Enum} record. These records have two fields: the |
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107 string @samp{EnumValue} and a space-separated list of properties. |
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108 Properties use the same format as option properties; the following are |
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109 valid: |
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110 @table @code |
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111 @item Enum(@var{name}) |
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112 This property is required; @var{name} says which @samp{Enum} record |
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113 this @samp{EnumValue} record corresponds to. |
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114 |
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115 @item String(@var{string}) |
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116 This property is required; @var{string} is the string option argument |
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117 being described by this record. |
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118 |
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119 @item Value(@var{value}) |
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120 This property is required; it says what value (representable as |
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121 @code{int}) should be used for the given string. |
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122 |
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123 @item Canonical |
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124 This property is optional. If present, it says the present string is |
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125 the canonical one among all those with the given value. Other strings |
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126 yielding that value will be mapped to this one so specs do not need to |
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127 handle them. |
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128 |
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129 @item DriverOnly |
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130 This property is optional. If present, the present string will only |
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131 be accepted by the driver. This is used for cases such as |
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132 @option{-march=native} that are processed by the driver so that |
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133 @samp{gcc -v} shows how the options chosen depended on the system on |
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134 which the compiler was run. |
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135 @end table |
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136 |
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137 @item |
0 | 138 An option definition record. These records have the following fields: |
139 @enumerate | |
140 @item | |
141 the name of the option, with the leading ``-'' removed | |
142 @item | |
143 a space-separated list of option properties (@pxref{Option properties}) | |
144 @item | |
145 the help text to use for @option{--help} (omitted if the second field | |
146 contains the @code{Undocumented} property). | |
147 @end enumerate | |
148 | |
149 By default, all options beginning with ``f'', ``W'' or ``m'' are | |
150 implicitly assumed to take a ``no-'' form. This form should not be | |
151 listed separately. If an option beginning with one of these letters | |
152 does not have a ``no-'' form, you can use the @code{RejectNegative} | |
153 property to reject it. | |
154 | |
155 The help text is automatically line-wrapped before being displayed. | |
156 Normally the name of the option is printed on the left-hand side of | |
157 the output and the help text is printed on the right. However, if the | |
158 help text contains a tab character, the text to the left of the tab is | |
159 used instead of the option's name and the text to the right of the | |
160 tab forms the help text. This allows you to elaborate on what type | |
161 of argument the option takes. | |
162 | |
163 @item | |
164 A target mask record. These records have one field of the form | |
165 @samp{Mask(@var{x})}. The options-processing script will automatically | |
166 allocate a bit in @code{target_flags} (@pxref{Run-time Target}) for | |
167 each mask name @var{x} and set the macro @code{MASK_@var{x}} to the | |
168 appropriate bitmask. It will also declare a @code{TARGET_@var{x}} | |
169 macro that has the value 1 when bit @code{MASK_@var{x}} is set and | |
170 0 otherwise. | |
171 | |
172 They are primarily intended to declare target masks that are not | |
173 associated with user options, either because these masks represent | |
174 internal switches or because the options are not available on all | |
175 configurations and yet the masks always need to be defined. | |
176 @end itemize | |
177 | |
178 @node Option properties | |
179 @section Option properties | |
180 | |
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181 The second field of an option record can specify any of the following |
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182 properties. When an option takes an argument, it is enclosed in parentheses |
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183 following the option property name. The parser that handles option files |
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184 is quite simplistic, and will be tricked by any nested parentheses within |
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185 the argument text itself; in this case, the entire option argument can |
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186 be wrapped in curly braces within the parentheses to demarcate it, e.g.: |
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187 |
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188 @smallexample |
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189 Condition(@{defined (USE_CYGWIN_LIBSTDCXX_WRAPPERS)@}) |
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190 @end smallexample |
0 | 191 |
192 @table @code | |
193 @item Common | |
194 The option is available for all languages and targets. | |
195 | |
196 @item Target | |
197 The option is available for all languages but is target-specific. | |
198 | |
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199 @item Driver |
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200 The option is handled by the compiler driver using code not shared |
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201 with the compilers proper (@file{cc1} etc.). |
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202 |
0 | 203 @item @var{language} |
204 The option is available when compiling for the given language. | |
205 | |
206 It is possible to specify several different languages for the same | |
207 option. Each @var{language} must have been declared by an earlier | |
208 @code{Language} record. @xref{Option file format}. | |
209 | |
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210 @item RejectDriver |
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211 The option is only handled by the compilers proper (@file{cc1} etc.)@: |
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212 and should not be accepted by the driver. |
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213 |
0 | 214 @item RejectNegative |
215 The option does not have a ``no-'' form. All options beginning with | |
216 ``f'', ``W'' or ``m'' are assumed to have a ``no-'' form unless this | |
217 property is used. | |
218 | |
219 @item Negative(@var{othername}) | |
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220 The option will turn off another option @var{othername}, which is |
0 | 221 the option name with the leading ``-'' removed. This chain action will |
222 propagate through the @code{Negative} property of the option to be | |
223 turned off. | |
224 | |
111 | 225 As a consequence, if you have a group of mutually-exclusive |
226 options, their @code{Negative} properties should form a circular chain. | |
227 For example, if options @option{-@var{a}}, @option{-@var{b}} and | |
228 @option{-@var{c}} are mutually exclusive, their respective @code{Negative} | |
229 properties should be @samp{Negative(@var{b})}, @samp{Negative(@var{c})} | |
230 and @samp{Negative(@var{a})}. | |
231 | |
0 | 232 @item Joined |
233 @itemx Separate | |
234 The option takes a mandatory argument. @code{Joined} indicates | |
235 that the option and argument can be included in the same @code{argv} | |
236 entry (as with @code{-mflush-func=@var{name}}, for example). | |
237 @code{Separate} indicates that the option and argument can be | |
238 separate @code{argv} entries (as with @code{-o}). An option is | |
239 allowed to have both of these properties. | |
240 | |
241 @item JoinedOrMissing | |
242 The option takes an optional argument. If the argument is given, | |
243 it will be part of the same @code{argv} entry as the option itself. | |
244 | |
245 This property cannot be used alongside @code{Joined} or @code{Separate}. | |
246 | |
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247 @item MissingArgError(@var{message}) |
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248 For an option marked @code{Joined} or @code{Separate}, the message |
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249 @var{message} will be used as an error message if the mandatory |
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250 argument is missing; for options without @code{MissingArgError}, a |
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251 generic error message is used. @var{message} should contain a single |
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252 @samp{%qs} format, which will be used to format the name of the option |
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253 passed. |
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254 |
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255 @item Args(@var{n}) |
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256 For an option marked @code{Separate}, indicate that it takes @var{n} |
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257 arguments. The default is 1. |
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258 |
0 | 259 @item UInteger |
260 The option's argument is a non-negative integer. The option parser | |
261 will check and convert the argument before passing it to the relevant | |
262 option handler. @code{UInteger} should also be used on options like | |
263 @code{-falign-loops} where both @code{-falign-loops} and | |
264 @code{-falign-loops}=@var{n} are supported to make sure the saved | |
265 options are given a full integer. | |
266 | |
111 | 267 @item ToLower |
268 The option's argument should be converted to lowercase as part of | |
269 putting it in canonical form, and before comparing with the strings | |
270 indicated by any @code{Enum} property. | |
271 | |
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272 @item NoDriverArg |
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273 For an option marked @code{Separate}, the option only takes an |
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274 argument in the compiler proper, not in the driver. This is for |
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275 compatibility with existing options that are used both directly and |
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276 via @option{-Wp,}; new options should not have this property. |
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277 |
0 | 278 @item Var(@var{var}) |
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279 The state of this option should be stored in variable @var{var} |
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280 (actually a macro for @code{global_options.x_@var{var}}). |
0 | 281 The way that the state is stored depends on the type of option: |
282 | |
283 @itemize @bullet | |
284 @item | |
285 If the option uses the @code{Mask} or @code{InverseMask} properties, | |
286 @var{var} is the integer variable that contains the mask. | |
287 | |
288 @item | |
289 If the option is a normal on/off switch, @var{var} is an integer | |
290 variable that is nonzero when the option is enabled. The options | |
291 parser will set the variable to 1 when the positive form of the | |
292 option is used and 0 when the ``no-'' form is used. | |
293 | |
294 @item | |
295 If the option takes an argument and has the @code{UInteger} property, | |
296 @var{var} is an integer variable that stores the value of the argument. | |
297 | |
298 @item | |
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299 If the option takes an argument and has the @code{Enum} property, |
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300 @var{var} is a variable (type given in the @code{Type} property of the |
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301 @samp{Enum} record whose @code{Name} property has the same argument as |
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302 the @code{Enum} property of this option) that stores the value of the |
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303 argument. |
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304 |
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305 @item |
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306 If the option has the @code{Defer} property, @var{var} is a pointer to |
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307 a @code{VEC(cl_deferred_option,heap)} that stores the option for later |
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308 processing. (@var{var} is declared with type @code{void *} and needs |
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309 to be cast to @code{VEC(cl_deferred_option,heap)} before use.) |
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310 |
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311 @item |
0 | 312 Otherwise, if the option takes an argument, @var{var} is a pointer to |
313 the argument string. The pointer will be null if the argument is optional | |
314 and wasn't given. | |
315 @end itemize | |
316 | |
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317 The option-processing script will usually zero-initialize @var{var}. |
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318 You can modify this behavior using @code{Init}. |
0 | 319 |
320 @item Var(@var{var}, @var{set}) | |
321 The option controls an integer variable @var{var} and is active when | |
322 @var{var} equals @var{set}. The option parser will set @var{var} to | |
323 @var{set} when the positive form of the option is used and @code{!@var{set}} | |
324 when the ``no-'' form is used. | |
325 | |
326 @var{var} is declared in the same way as for the single-argument form | |
327 described above. | |
328 | |
329 @item Init(@var{value}) | |
330 The variable specified by the @code{Var} property should be statically | |
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331 initialized to @var{value}. If more than one option using the same |
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332 variable specifies @code{Init}, all must specify the same initializer. |
0 | 333 |
334 @item Mask(@var{name}) | |
335 The option is associated with a bit in the @code{target_flags} | |
336 variable (@pxref{Run-time Target}) and is active when that bit is set. | |
337 You may also specify @code{Var} to select a variable other than | |
338 @code{target_flags}. | |
339 | |
340 The options-processing script will automatically allocate a unique bit | |
341 for the option. If the option is attached to @samp{target_flags}, | |
342 the script will set the macro @code{MASK_@var{name}} to the appropriate | |
343 bitmask. It will also declare a @code{TARGET_@var{name}} macro that has | |
344 the value 1 when the option is active and 0 otherwise. If you use @code{Var} | |
111 | 345 to attach the option to a different variable, the bitmask macro with be |
346 called @code{OPTION_MASK_@var{name}}. | |
0 | 347 |
348 @item InverseMask(@var{othername}) | |
349 @itemx InverseMask(@var{othername}, @var{thisname}) | |
350 The option is the inverse of another option that has the | |
351 @code{Mask(@var{othername})} property. If @var{thisname} is given, | |
352 the options-processing script will declare a @code{TARGET_@var{thisname}} | |
353 macro that is 1 when the option is active and 0 otherwise. | |
354 | |
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355 @item Enum(@var{name}) |
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356 The option's argument is a string from the set of strings associated |
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357 with the corresponding @samp{Enum} record. The string is checked and |
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358 converted to the integer specified in the corresponding |
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359 @samp{EnumValue} record before being passed to option handlers. |
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360 |
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361 @item Defer |
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362 The option should be stored in a vector, specified with @code{Var}, |
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363 for later processing. |
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364 |
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365 @item Alias(@var{opt}) |
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366 @itemx Alias(@var{opt}, @var{arg}) |
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367 @itemx Alias(@var{opt}, @var{posarg}, @var{negarg}) |
111 | 368 The option is an alias for @option{-@var{opt}} (or the negative form |
369 of that option, depending on @code{NegativeAlias}). In the first form, | |
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370 any argument passed to the alias is considered to be passed to |
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371 @option{-@var{opt}}, and @option{-@var{opt}} is considered to be |
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372 negated if the alias is used in negated form. In the second form, the |
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373 alias may not be negated or have an argument, and @var{posarg} is |
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374 considered to be passed as an argument to @option{-@var{opt}}. In the |
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375 third form, the alias may not have an argument, if the alias is used |
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376 in the positive form then @var{posarg} is considered to be passed to |
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377 @option{-@var{opt}}, and if the alias is used in the negative form |
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378 then @var{negarg} is considered to be passed to @option{-@var{opt}}. |
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379 |
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380 Aliases should not specify @code{Var} or @code{Mask} or |
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381 @code{UInteger}. Aliases should normally specify the same languages |
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382 as the target of the alias; the flags on the target will be used to |
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383 determine any diagnostic for use of an option for the wrong language, |
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384 while those on the alias will be used to identify what command-line |
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385 text is the option and what text is any argument to that option. |
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386 |
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387 When an @code{Alias} definition is used for an option, driver specs do |
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388 not need to handle it and no @samp{OPT_} enumeration value is defined |
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389 for it; only the canonical form of the option will be seen in those |
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390 places. |
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391 |
111 | 392 @item NegativeAlias |
393 For an option marked with @code{Alias(@var{opt})}, the option is | |
394 considered to be an alias for the positive form of @option{-@var{opt}} | |
395 if negated and for the negative form of @option{-@var{opt}} if not | |
396 negated. @code{NegativeAlias} may not be used with the forms of | |
397 @code{Alias} taking more than one argument. | |
398 | |
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399 @item Ignore |
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400 This option is ignored apart from printing any warning specified using |
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401 @code{Warn}. The option will not be seen by specs and no @samp{OPT_} |
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402 enumeration value is defined for it. |
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403 |
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404 @item SeparateAlias |
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405 For an option marked with @code{Joined}, @code{Separate} and |
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406 @code{Alias}, the option only acts as an alias when passed a separate |
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407 argument; with a joined argument it acts as a normal option, with an |
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408 @samp{OPT_} enumeration value. This is for compatibility with the |
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409 Java @option{-d} option and should not be used for new options. |
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410 |
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411 @item Warn(@var{message}) |
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412 If this option is used, output the warning @var{message}. |
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413 @var{message} is a format string, either taking a single operand with |
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414 a @samp{%qs} format which is the option name, or not taking any |
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415 operands, which is passed to the @samp{warning} function. If an alias |
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416 is marked @code{Warn}, the target of the alias must not also be marked |
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417 @code{Warn}. |
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418 |
0 | 419 @item Report |
420 The state of the option should be printed by @option{-fverbose-asm}. | |
421 | |
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422 @item Warning |
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423 This is a warning option and should be shown as such in |
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424 @option{--help} output. This flag does not currently affect anything |
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425 other than @option{--help}. |
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426 |
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427 @item Optimization |
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428 This is an optimization option. It should be shown as such in |
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429 @option{--help} output, and any associated variable named using |
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430 @code{Var} should be saved and restored when the optimization level is |
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431 changed with @code{optimize} attributes. |
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432 |
111 | 433 @item PerFunction |
434 This is an option that can be overridden on a per-function basis. | |
435 @code{Optimization} implies @code{PerFunction}, but options that do not | |
436 affect executable code generation may use this flag instead, so that the | |
437 option is not taken into account in ways that might affect executable | |
438 code generation. | |
439 | |
0 | 440 @item Undocumented |
441 The option is deliberately missing documentation and should not | |
442 be included in the @option{--help} output. | |
443 | |
444 @item Condition(@var{cond}) | |
445 The option should only be accepted if preprocessor condition | |
446 @var{cond} is true. Note that any C declarations associated with the | |
447 option will be present even if @var{cond} is false; @var{cond} simply | |
448 controls whether the option is accepted and whether it is printed in | |
449 the @option{--help} output. | |
450 | |
451 @item Save | |
452 Build the @code{cl_target_option} structure to hold a copy of the | |
453 option, add the functions @code{cl_target_option_save} and | |
454 @code{cl_target_option_restore} to save and restore the options. | |
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455 |
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456 @item SetByCombined |
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457 The option may also be set by a combined option such as |
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458 @option{-ffast-math}. This causes the @code{gcc_options} struct to |
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459 have a field @code{frontend_set_@var{name}}, where @code{@var{name}} |
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460 is the name of the field holding the value of this option (without the |
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461 leading @code{x_}). This gives the front end a way to indicate that |
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462 the value has been set explicitly and should not be changed by the |
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463 combined option. For example, some front ends use this to prevent |
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464 @option{-ffast-math} and @option{-fno-fast-math} from changing the |
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465 value of @option{-fmath-errno} for languages that do not use |
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466 @code{errno}. |
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467 |
111 | 468 @item EnabledBy(@var{opt}) |
469 @itemx EnabledBy(@var{opt} || @var{opt2}) | |
470 @itemx EnabledBy(@var{opt} && @var{opt2}) | |
471 If not explicitly set, the option is set to the value of | |
472 @option{-@var{opt}}; multiple options can be given, separated by | |
473 @code{||}. The third form using @code{&&} specifies that the option is | |
474 only set if both @var{opt} and @var{opt2} are set. The options @var{opt} | |
475 and @var{opt2} must have the @code{Common} property; otherwise, use | |
476 @code{LangEnabledBy}. | |
477 | |
478 @item LangEnabledBy(@var{language}, @var{opt}) | |
479 @itemx LangEnabledBy(@var{language}, @var{opt}, @var{posarg}, @var{negarg}) | |
480 When compiling for the given language, the option is set to the value | |
481 of @option{-@var{opt}}, if not explicitly set. @var{opt} can be also a list | |
482 of @code{||} separated options. In the second form, if | |
483 @var{opt} is used in the positive form then @var{posarg} is considered | |
484 to be passed to the option, and if @var{opt} is used in the negative | |
485 form then @var{negarg} is considered to be passed to the option. It | |
486 is possible to specify several different languages. Each | |
487 @var{language} must have been declared by an earlier @code{Language} | |
488 record. @xref{Option file format}. | |
489 | |
490 @item NoDWARFRecord | |
491 The option is omitted from the producer string written by | |
492 @option{-grecord-gcc-switches}. | |
493 | |
494 @item PchIgnore | |
495 Even if this is a target option, this option will not be recorded / compared | |
496 to determine if a precompiled header file matches. | |
497 | |
498 @item CPP(@var{var}) | |
499 The state of this option should be kept in sync with the preprocessor | |
500 option @var{var}. If this property is set, then properties @code{Var} | |
501 and @code{Init} must be set as well. | |
502 | |
503 @item CppReason(@var{CPP_W_Enum}) | |
504 This warning option corresponds to @code{cpplib.h} warning reason code | |
505 @var{CPP_W_Enum}. This should only be used for warning options of the | |
506 C-family front-ends. | |
507 | |
0 | 508 @end table |