1 | =head1 NAME
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2 |
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3 | perldelta - what is new for perl v5.8.7
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4 |
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5 | =head1 DESCRIPTION
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6 |
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7 | This document describes differences between the 5.8.6 release and
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8 | the 5.8.7 release.
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9 |
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10 | =head1 Incompatible Changes
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11 |
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12 | There are no changes incompatible with 5.8.6.
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13 |
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14 | =head1 Core Enhancements
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15 |
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16 | =head2 Unicode Character Database 4.1.0
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17 |
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18 | The copy of the Unicode Character Database included in Perl 5.8 has
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19 | been updated to 4.1.0 from 4.0.1. See
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20 | L<http://www.unicode.org/versions/Unicode4.1.0/#NotableChanges> for the
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21 | notable changes.
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22 |
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23 | =head2 suidperl less insecure
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24 |
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25 | A pair of exploits in C<suidperl> involving debugging code have been closed.
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26 |
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27 | For new projects the core perl team strongly recommends that you use
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28 | dedicated, single purpose security tools such as C<sudo> in preference to
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29 | C<suidperl>.
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30 |
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31 | =head2 Optional site customization script
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32 |
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33 | The perl interpreter can be built to allow the use of a site customization
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34 | script. By default this is not enabled, to be consistent with previous perl
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35 | releases. To use this, add C<-Dusesitecustomize> to the command line flags
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36 | when running the C<Configure> script. See also L<perlrun/-f>.
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37 |
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38 | =head2 C<Config.pm> is now much smaller.
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39 |
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40 | C<Config.pm> is now about 3K rather than 32K, with the infrequently used
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41 | code and C<%Config> values loaded on demand. This is transparent to the
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42 | programmer, but means that most code will save parsing and loading 29K of
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43 | script (for example, code that uses C<File::Find>).
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44 |
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45 | =head1 Modules and Pragmata
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46 |
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47 | =over 4
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48 |
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49 | =item *
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50 |
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51 | B upgraded to version 1.09
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52 |
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53 | =item *
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54 |
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55 | base upgraded to version 2.07
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56 |
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57 | =item *
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58 |
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59 | bignum upgraded to version 0.17
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60 |
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61 | =item *
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62 |
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63 | bytes upgraded to version 1.02
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64 |
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65 | =item *
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66 |
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67 | Carp upgraded to version 1.04
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68 |
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69 | =item *
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70 |
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71 | CGI upgraded to version 3.10
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72 |
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73 | =item *
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74 |
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75 | Class::ISA upgraded to version 0.33
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76 |
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77 | =item *
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78 |
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79 | Data::Dumper upgraded to version 2.121_02
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80 |
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81 | =item *
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82 |
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83 | DB_File upgraded to version 1.811
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84 |
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85 | =item *
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86 |
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87 | Devel::PPPort upgraded to version 3.06
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88 |
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89 | =item *
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90 |
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91 | Digest upgraded to version 1.10
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92 |
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93 | =item *
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94 |
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95 | Encode upgraded to version 2.10
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96 |
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97 | =item *
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98 |
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99 | FileCache upgraded to version 1.05
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100 |
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101 | =item *
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102 |
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103 | File::Path upgraded to version 1.07
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104 |
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105 | =item *
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106 |
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107 | File::Temp upgraded to version 0.16
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108 |
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109 | =item *
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110 |
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111 | IO::File upgraded to version 1.11
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112 |
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113 | =item *
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114 |
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115 | IO::Socket upgraded to version 1.28
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116 |
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117 | =item *
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118 |
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119 | Math::BigInt upgraded to version 1.77
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120 |
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121 | =item *
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122 |
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123 | Math::BigRat upgraded to version 0.15
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124 |
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125 | =item *
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126 |
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127 | overload upgraded to version 1.03
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128 |
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129 | =item *
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130 |
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131 | PathTools upgraded to version 3.05
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132 |
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133 | =item *
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134 |
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135 | Pod::HTML upgraded to version 1.0503
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136 |
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137 | =item *
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138 |
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139 | Pod::Perldoc upgraded to version 3.14
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140 |
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141 | =item *
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142 |
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143 | Pod::LaTeX upgraded to version 0.58
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144 |
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145 | =item *
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146 |
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147 | Pod::Parser upgraded to version 1.30
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148 |
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149 | =item *
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150 |
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151 | Symbol upgraded to version 1.06
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152 |
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153 | =item *
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154 |
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155 | Term::ANSIColor upgraded to version 1.09
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156 |
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157 | =item *
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158 |
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159 | Test::Harness upgraded to version 2.48
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160 |
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161 | =item *
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162 |
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163 | Test::Simple upgraded to version 0.54
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164 |
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165 | =item *
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166 |
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167 | Text::Wrap upgraded to version 2001.09293, to fix a bug when wrap() was
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168 | called with a non-space separator.
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169 |
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170 | =item *
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171 |
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172 | threads::shared upgraded to version 0.93
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173 |
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174 | =item *
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175 |
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176 | Time::HiRes upgraded to version 1.66
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177 |
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178 | =item *
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179 |
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180 | Time::Local upgraded to version 1.11
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181 |
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182 | =item *
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183 |
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184 | Unicode::Normalize upgraded to version 0.32
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185 |
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186 | =item *
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187 |
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188 | utf8 upgraded to version 1.05
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189 |
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190 | =item *
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191 |
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192 | Win32 upgraded to version 0.24, which provides Win32::GetFileVersion
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193 |
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194 | =back
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195 |
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196 | =head1 Utility Changes
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197 |
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198 | =head2 find2perl enhancements
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199 |
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200 | C<find2perl> has new options C<-iname>, C<-path> and C<-ipath>.
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201 |
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202 | =head1 Performance Enhancements
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203 |
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204 | The internal pointer mapping hash used during ithreads cloning now uses an
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205 | arena for memory allocation. In tests this reduced ithreads cloning time by
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206 | about 10%.
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207 |
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208 | =head1 Installation and Configuration Improvements
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209 |
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210 | =over 4
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211 |
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212 | =item *
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213 |
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214 | The Win32 "dmake" makefile.mk has been updated to make it compatible
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215 | with the latest versions of dmake.
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216 |
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217 | =item *
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218 |
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219 | C<PERL_MALLOC>, C<DEBUG_MSTATS>, C<PERL_HASH_SEED_EXPLICIT> and C<NO_HASH_SEED>
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220 | should now work in Win32 makefiles.
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221 |
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222 | =back
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223 |
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224 | =head1 Selected Bug Fixes
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225 |
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226 | =over 4
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227 |
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228 | =item *
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229 |
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230 | The socket() function on Win32 has been fixed so that it is able to use
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231 | transport providers which specify a protocol of 0 (meaning any protocol
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232 | is allowed) once more. (This was broken in 5.8.6, and typically caused
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233 | the use of ICMP sockets to fail.)
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234 |
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235 | =item *
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236 |
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237 | Another obscure bug involving C<substr> and UTF-8 caused by bad internal
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238 | offset caching has been identified and fixed.
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239 |
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240 | =item *
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241 |
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242 | A bug involving the loading of UTF-8 tables by the regexp engine has been
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243 | fixed - code such as C<"\x{100}" =~ /[[:print:]]/> will no longer give
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244 | corrupt results.
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245 |
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246 | =item *
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247 |
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248 | Case conversion operations such as C<uc> on a long Unicode string could
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249 | exhaust memory. This has been fixed.
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250 |
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251 | =item *
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252 |
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253 | C<index>/C<rindex> were buggy for some combinations of Unicode and
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254 | non-Unicode data. This has been fixed.
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255 |
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256 | =item *
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257 |
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258 | C<read> (and presumably C<sysread>) would expose the UTF-8 internals when
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259 | reading from a byte oriented file handle into a UTF-8 scalar. This has
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260 | been fixed.
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261 |
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262 | =item *
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263 |
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264 | Several C<pack>/C<unpack> bug fixes:
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265 |
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266 | =over 4
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267 |
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268 | =item *
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269 |
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270 | Checksums with C<b> or C<B> formats were broken.
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271 |
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272 | =item *
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273 |
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274 | C<unpack> checksums could overflow with the C<C> format.
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275 |
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276 | =item *
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277 |
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278 | C<U0> and C<C0> are now scoped to C<()> C<pack> sub-templates.
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279 |
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280 | =item *
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281 |
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282 | Counted length prefixes now don't change C<C0>/C<U0> mode.
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283 |
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284 | =item *
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285 |
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286 | C<pack> C<Z0> used to destroy the preceding character.
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287 |
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288 | =item *
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289 |
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290 | C<P>/C<p> C<pack> formats used to only recognise literal C<undef>
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291 |
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292 | =back
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293 |
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294 | =item *
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295 |
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296 | Using closures with ithreads could cause perl to crash. This was due to
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297 | failure to correctly lock internal OP structures, and has been fixed.
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298 |
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299 | =item *
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300 |
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301 | The return value of C<close> now correctly reflects any file errors that
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302 | occur while flushing the handle's data, instead of just giving failure if
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303 | the actual underlying file close operation failed.
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304 |
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305 | =item *
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306 |
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307 | C<not() || 1> used to segfault. C<not()> now behaves like C<not(0)>, which was
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308 | the pre 5.6.0 behaviour.
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309 |
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310 | =item *
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311 |
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312 | C<h2ph> has various enhancements to cope with constructs in header files that
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313 | used to result in incorrect or invalid output.
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314 |
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315 | =back
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316 |
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317 | =head1 New or Changed Diagnostics
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318 |
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319 | There is a new taint error, "%ENV is aliased to %s". This error is thrown
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320 | when taint checks are enabled and when C<*ENV> has been aliased, so that
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321 | C<%ENV> has no env-magic anymore and hence the environment cannot be verified
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322 | as taint-free.
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323 |
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324 | The internals of C<pack> and C<unpack> have been updated. All legitimate
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325 | templates should work as before, but there may be some changes in the error
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326 | reported for complex failure cases. Any behaviour changes for non-error cases
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327 | are bugs, and should be reported.
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328 |
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329 | =head1 Changed Internals
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330 |
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331 | There has been a fair amount of refactoring of the C<C> source code, partly to
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332 | make it tidier and more maintainable. The resulting object code and the
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333 | C<perl> binary may well be smaller than 5.8.6, and hopefully faster in some
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334 | cases, but apart from this there should be no user-detectable changes.
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335 |
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336 | C<${^UTF8LOCALE}> has been added to give perl space access to C<PL_utf8locale>.
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337 |
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338 | The size of the arenas used to allocate SV heads and most SV bodies can now
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339 | be changed at compile time. The old size was 1008 bytes, the new default size
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340 | is 4080 bytes.
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341 |
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342 | =head1 Known Problems
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343 |
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344 | Unicode strings returned from overloaded operators can be buggy. This is a
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345 | long standing bug reported since 5.8.6 was released, but we do not yet have
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346 | a suitable fix for it.
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347 |
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348 | =head1 Platform Specific Problems
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349 |
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350 | On UNICOS, lib/Math/BigInt/t/bigintc.t hangs burning CPU.
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351 | ext/B/t/bytecode.t and ext/Socket/t/socketpair.t both fail tests.
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352 | These are unlikely to be resolved, as our valiant UNICOS porter's last
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353 | Cray is being decommissioned.
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354 |
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355 | =head1 Reporting Bugs
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356 |
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357 | If you find what you think is a bug, you might check the articles
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358 | recently posted to the comp.lang.perl.misc newsgroup and the perl
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359 | bug database at http://bugs.perl.org. There may also be
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360 | information at http://www.perl.org, the Perl Home Page.
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361 |
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362 | If you believe you have an unreported bug, please run the B<perlbug>
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363 | program included with your release. Be sure to trim your bug down
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364 | to a tiny but sufficient test case. Your bug report, along with the
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365 | output of C<perl -V>, will be sent off to [email protected] to be
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366 | analysed by the Perl porting team. You can browse and search
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367 | the Perl 5 bugs at http://bugs.perl.org/
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368 |
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369 | =head1 SEE ALSO
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370 |
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371 | The F<Changes> file for exhaustive details on what changed.
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372 |
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373 | The F<INSTALL> file for how to build Perl.
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374 |
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375 | The F<README> file for general stuff.
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376 |
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377 | The F<Artistic> and F<Copying> files for copyright information.
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378 |
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379 | =cut
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