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annotate tradcpp.1 @ 119:4f493fb35821

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Test empty arguments.
author David A. Holland
date Tue, 11 Jun 2013 14:12:54 -0400
parents b2f2f30194b8
children 103acee239e0
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110
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1 .\"
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2 .\" Copyright (c) 2013 The NetBSD Foundation, Inc.
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3 .\" All rights reserved.
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4 .\"
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5 .\" This code is derived from software contributed to The NetBSD Foundation
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6 .\" by David A. Holland.
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7 .\"
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8 .\" Redistribution and use in source and binary forms, with or without
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9 .\" modification, are permitted provided that the following conditions
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10 .\" are met:
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11 .\" 1. Redistributions of source code must retain the above copyright
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12 .\" notice, this list of conditions and the following disclaimer.
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13 .\" 2. Redistributions in binary form must reproduce the above copyright
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14 .\" notice, this list of conditions and the following disclaimer in the
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15 .\" documentation and/or other materials provided with the distribution.
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16 .\"
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17 .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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18 .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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19 .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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20 .\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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21 .\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 .\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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23 .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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24 .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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26 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 .\" POSSIBILITY OF SUCH DAMAGE.
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28 .\"
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29 .Dd June 11, 2013
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30 .Dt TRADCPP 1
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31 .Os
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32 .Sh NAME
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33 .Nm tradcpp
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34 .Nd traditional (K&R-style) C macro preprocessor
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35 .Sh SYNOPSIS
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36 .Nm tradcpp
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37 .Op Fl options
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38 .Op Cm input-file Op Cm output-file
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39 .Sh DESCRIPTION
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40 The
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41 .Nm
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42 command provides a traditional K&R-style C macro preprocessor.
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43 It is intended to be suitable for historical Unix uses of the
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44 preprocessor, such as
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45 .Xr imake 1 ,
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46 particularly those that depend on preservation of whitespace.
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47 .Pp
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48 The chief ways in which traditional cpp differs from
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49 Standard C are:
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50 .Bl -bullet -offset indent
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51 .It
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52 Macro arguments are expanded within quoted strings.
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53 There is no stringize operator.
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54 .It
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55 There is no token pasting operator; tokens can be concatenated by
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56 placing comments between them.
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57 This process is also not limited to valid C language tokens.
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58 .It
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59 Whitespace is preserved, and in particular tabs are not expanded into
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60 spaces.
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61 Furthermore, additional whitespace is not injected.
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62 .El
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63 .Sh OPTIONS
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64 .Nm
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65 has many options, many of which are defined for compatibility with
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66 .Xr gcc 1
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67 or other compilers.
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68 Many of the options are not yet implemented.
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69 .\" The option lists have been sorted in what I hope is a sensible
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70 .\" order. Please don't arbirarily alphabetize them.
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71 .Ss Common Options
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72 .Bl -tag -width bubblebabble
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73 .It Fl C
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74 Retain comments in output.
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75 .It Fl Dmacro[=expansion]
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76 Provide a definition for the named macro.
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77 If no expansion is provided, the value
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78 .Dq 1
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79 is used.
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80 .It Fl -Ipath
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81 Add the specified path to the main list of include directories.
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82 .It Fl nostdinc
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83 Do not search the standard system include directories.
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84 .It Fl P
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85 Suppress line number information in the output.
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86 Currently line number information is not generated at all and this
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87 option has no effect.
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88 .It Fl Umacro
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89 Remove any existing defintion for the named macro.
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90 .It Fl undef
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91 Remove all predefined macros.
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92 .El
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93 .Ss Warning Options
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94 Warning options can be disabled or enabled by inserting, or not, the
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95 string
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96 .Dq no-
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97 between the
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98 .Dq W
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99 and the warning name.
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100 Herein the
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101 .Dq Fl Wno-
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102 form is shown for options that are enabled by default.
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103 .Bl -tag -width bubblebabble
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104 .It Fl Wall
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105 Turn on all warnings.
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106 The option
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107 .Fl Wno-all
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108 disables only the warnings that are disabled by default.
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109 .It Fl w
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110 Turn off all warnings.
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111 .It Fl Werror
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112 Make warnings into fatal errors.
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113 .It Fl Wcomment
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114 Warn about nested comments.
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115 .It Fl Wno-endif-labels
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116 Don't warn about symbols attached to #endif directives.
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117 (The warning is currently not implemented.)
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118 .It Fl Wundef
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119 Warn about undefined symbols appearing in #if and #elif expressions.
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120 .It Fl Wunused-macros
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121 Warn about macros that are defined and never used.
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122 Not implemented.
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123 .El
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124 .Ss Depend Options
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125 .Bl -tag -width bubblebabble
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126 .It Fl M
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127 Generate dependency information for
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128 .Xr make 1
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129 on the standard output, instead of preprocessing.
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130 Not implemented.
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131 .It Fl MD
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132 Like
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133 .Fl M
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134 but skip system headers.
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135 Not implemented.
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136 .It Fl MM
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137 Like
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138 .Fl M
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139 but write the dependency information to a file named after the input
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140 file with extension
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141 .Pa \.d
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142 and preprocess normally to standard output.
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143 Not implemented.
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144 .It Fl MMD
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145 Like
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146 .Fl MM
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147 but skip system headers.
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148 Not implemented.
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149 .It Fl MG
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150 When generating dependency information, assume that missing files are
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151 generated instead of failing.
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152 Not implemented.
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153 .It Fl MP
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154 Issue dummy rules for all include files.
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155 This prevents
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156 .Xr make 1
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157 from choking if an include file is removed.
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158 Not implemented.
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159 .El
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160 .Ss Diagnostic Options
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161 .Bl -tag -width bubblebabble
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162 .It Fl dD
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163 Dump all macro definitions, except for the predefined macros, after
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164 the normal preprocessing output.
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165 Not implemented.
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166 .It Fl dI
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167 Dump all include directives along with the normal preprocessing
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168 output.
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169 Not implemented.
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170 .It Fl dM
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171 Dump all macro definitions instead of the normal preprocessing
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172 output.
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173 Not implemented.
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174 .It Fl dN
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175 Like
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176 .Fl dD
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177 but emits only macro names and not the expansions.
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178 Not implemented.
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179 .It Fl H
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180 Output a trace of the include tree as it gets processed.
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181 Not implemented.
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182 .El
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183 .Ss Other Options
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184 .Bl -tag -width bubblebabble
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185 .It Fl CC
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186 Retain comments in output.
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187 Same as
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188 .Fl C ,
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189 accepted for compatibility with
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190 .Xr gcc 1 .
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191 .It Fl fdollars-in-identifiers Fl fno-dollars-in-identifiers
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192 Enable
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193 .Pq or disable, respectively
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194 the use of the dollar sign in identifiers.
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195 Not implemented.
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196 .It Fl ftabstop=num
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197 Set the tab width to the specified value, for reporting column
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198 positions in diagnostics.
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199 The default is 8.
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200 Not implemented.
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201 .It Fl std=standard
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202 Ask
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203 .Nm
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204 to conform to the named standard.
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205 The default, and the only supported value, is
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206 .Dq krc .
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207 .It Fl traditional
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208 This option is accepted for compatibility with
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209 .Xr gcc 1
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210 and ignored.
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211 .El
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212 .Sh FILES
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213 The default list of directories searched for include files is:
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214 .Bl -item -offset indent -compact
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215 .It
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216 .Pa /usr/local/include
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217 .It
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218 .Pa /usr/include
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219 .El
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220 .Sh SEE ALSO
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221 .Xr cc 1 ,
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222 .Xr cpp 1 ,
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223 .Xr make 1
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224 .Sh STANDARDS
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225 None.
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226 The whole point of a traditional cpp is that it reflects practices
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227 in pre-standardization implementations of C.
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228 Some information is available from the first edition of Kernighan and
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229 Ritchie.
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230 Much of the rest of the behavior is based on lore, pragmatism,
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231 material encountered in the wild, and comparison to other
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232 implementations.
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233 .Sh HISTORY
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234 The original version of
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235 .Nm
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236 was written one evening in late 2010.
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237 This version had some problems and was put aside.
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238 The first working version was released in June 2013.
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239 .\" .Sh AUTHORS
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240 .\" David A. Holland
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241 .Sh BUGS
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242 Probably plenty.