1 | <?xml version="1.0" encoding="UTF-8"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 |
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7 | <!ENTITY qtwebengine-download-http "https://download.qt.io/official_releases/qt/&qtwebengine-major;/&qtwebengine-version;/submodules/qtwebengine-everywhere-src-&qtwebengine-version;.tar.xz">
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8 | <!ENTITY qtwebengine-download-ftp " ">
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9 | <!ENTITY qtwebengine-md5sum "1ea326e16c0453509b5be8c4d6378fa9">
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10 | <!ENTITY qtwebengine-size "540 MB">
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11 | <!ENTITY qtwebengine-buildsize "9.1 GB (343 MB installed)">
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12 | <!ENTITY qtwebengine-time "42 SBU (Using parallelism=8)">
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13 | ]>
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14 |
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15 | <sect1 id="qtwebengine" xreflabel="qtwebengine-&qtwebengine-version;">
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16 | <?dbhtml filename="qtwebengine.html"?>
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17 |
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18 | <title>QtWebEngine-&qtwebengine-version;</title>
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19 |
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20 | <indexterm zone="qtwebengine">
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21 | <primary sortas="a-qtwebengine">qtwebengine</primary>
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22 | </indexterm>
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23 |
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24 | <sect2 role="package">
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25 | <title>Introduction to QtWebEngine</title>
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26 |
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27 | <para>
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28 | <application>QtWebEngine</application> integrates
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29 | <application>chromium</application>'s web capabilities into Qt. It
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30 | ships with its own copy of ninja which it uses for the build if it cannot
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31 | find a system copy, and various copies of libraries from ffmpeg, icu,
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32 | libvpx, and zlib (including libminizip) which have been forked by the
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33 | <application>chromium</application> developers.
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34 | </para>
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35 |
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36 | <para>
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37 | This package and browsers using it may be useful if you need to use a
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38 | website designed for google chrome, or chromium, browsers.
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39 | </para>
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40 |
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41 | <warning>
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42 | <para>
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43 | QtWebEngine uses a forked copy of chromium, and is therefore vulnerable
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44 | to many issues found there. The Qt developers seem to fork a newer
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45 | version for minor Qt versions, but because chromium moves to newer
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46 | versions very often, by the time the Qt developers get a forked version
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47 | to pass their extended tests it is always an old version and security
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48 | fixes from chromium (some of which have a CVE number) can take several
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49 | months to appear in a QtWebengine release, even if the severity has been
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50 | rated as Critical.
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51 | </para>
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52 |
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53 | <para>
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54 | Therefore, you should be wary of using QtWebEngine in a sensitive
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55 | context and should always update to the next release as soon as it
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56 | appears in this book, even if is not flagged as a Security Update.
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57 | Identifying which vulnerabilities have been fixed in a particular
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58 | release requires pulling the appropriate 'based-NNN' branch just before
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59 | the previous and current releases and is often impractical. Reports of
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60 | fixed QTBUG items do not seem to be available and there is not any
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61 | documentation in the tarball for changes after the qt-5 versions.
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62 | </para>
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63 | </warning>
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64 |
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65 | &lfs122_checked;
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66 |
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67 | <warning>
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68 | <para>
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69 | By default, ninja will use all online CPUs +2 (if at least 4 exist),
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70 | even if they are not available to the current task because the build
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71 | terminal has been restricted with 'taskset'. In BLFS, this package
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72 | takes more time to build than any other. In one example,
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73 | the build of this package crashed at about the 90 percent point
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74 | due to an out of memory problem on a system with 24 cores and 32 GB
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75 | of memory.
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76 | </para>
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77 |
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78 | <para>
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79 | To work around this, see the Command Explanations below.
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80 | </para>
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81 | </warning>
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82 |
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83 | <bridgehead renderas="sect3">Package Information</bridgehead>
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84 | <itemizedlist spacing="compact">
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85 | <listitem>
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86 | <para>
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87 | Download (HTTP): <ulink url="&qtwebengine-download-http;"/>
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88 | </para>
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89 | </listitem>
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90 | <listitem>
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91 | <para>
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92 | Download (FTP): <ulink url="&qtwebengine-download-ftp;"/>
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93 | </para>
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94 | </listitem>
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95 | <listitem>
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96 | <para>
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97 | Download MD5 sum: &qtwebengine-md5sum;
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98 | </para>
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99 | </listitem>
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100 | <listitem>
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101 | <para>
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102 | Download size: &qtwebengine-size;
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103 | </para>
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104 | </listitem>
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105 | <listitem>
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106 | <para>
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107 | Estimated disk space required: &qtwebengine-buildsize;
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108 | </para>
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109 | </listitem>
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110 | <listitem>
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111 | <para>
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112 | Estimated build time: &qtwebengine-time;
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113 | </para>
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114 | </listitem>
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115 | </itemizedlist>
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116 | <!--
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117 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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118 | <itemizedlist spacing="compact"> -->
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119 | <!-- keep links for releases and git versions as a reminder
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120 | that the tarball names names differ
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121 | <ulink url="&patch-root;/qtwebengine-everywhere-src-&qtwebengine-version;-ICU68-2.patch"/>-->
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122 | <!--<ulink url="&patch-root;/qtwebengine-&qtwebengine-version;-5.15.7-1.patch"/>-->
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123 | <!-- <listitem>
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124 | <para>
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125 | Required patch:
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126 | <ulink url="&patch-root;/qtwebengine-&qtwebengine-version;-ffmpeg7_fixes-1.patch"/>
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127 | </para>
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128 | </listitem>
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129 | </itemizedlist>
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130 | -->
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131 |
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132 | <bridgehead renderas="sect3">qtwebengine Dependencies</bridgehead>
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133 |
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134 | <bridgehead renderas="sect4">Required</bridgehead>
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135 |
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136 | <para role="required">
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137 | <xref linkend="cups"/>,
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138 | <xref linkend="html5lib"/>,
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139 | <xref linkend="nodejs"/>,
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140 | <xref linkend="nss"/>,
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141 | <xref linkend="pciutils"/>, and
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142 | <xref linkend='qt6'/>
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143 | </para>
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144 |
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145 | <bridgehead renderas="sect4">Recommended</bridgehead>
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146 | <note>
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147 | <para>
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148 | If these packages are not installed, the build process will compile and
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149 | install its own (perhaps older) version, with the side effect of
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150 | increasing build and installed disk space and build time.
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151 | </para>
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152 | </note>
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153 |
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154 | <para role="recommended">
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155 | either <xref linkend="alsa-lib"/> or
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156 | <xref linkend="pulseaudio"/> (or both),
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157 | <xref linkend="ffmpeg"/>,
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158 | <xref linkend="icu"/>,
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159 | <xref linkend="libwebp"/>,
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160 | <xref linkend="libxslt"/>, and
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161 | <xref linkend="opus"/>
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162 | </para>
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163 |
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164 | <bridgehead renderas="sect4">Optional</bridgehead>
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165 | <para role="optional">
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166 | <xref linkend="libevent"/>,
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167 | <xref linkend="mitkrb"/>,
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168 | <xref linkend="pipewire"/>,
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169 | <xref linkend="poppler"/>,
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170 | <ulink url="https://github.com/open-source-parsers/jsoncpp/releases">jsoncpp</ulink>,
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171 | <ulink url="https://github.com/cisco/libsrtp/releases">libsrtp</ulink>,
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172 | <ulink url="https://google.github.io/snappy/">snappy</ulink>
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173 | </para>
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174 |
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175 | </sect2>
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176 |
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177 | <sect2 role="installation">
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178 | <title>Installation of qtwebengine</title>
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179 | <!--
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180 | <para>
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181 | First, adapt the bundled copy of Chromium to the latest version of ffmpeg:
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182 | </para>
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183 |
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184 | <screen><userinput remap="pre">patch -Np1 -d src/3rdparty/chromium < ../qtwebengine-&qtwebengine-version;-ffmpeg7_fixes-1.patch</userinput></screen>
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185 | -->
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186 | <para>
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187 | First, fix a build failure that occurs because the BLFS build of ffmpeg
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188 | does not use OpenH264:
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189 | </para>
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190 |
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191 | <screen><userinput remap="pre">sed -e '189 s/=/& false/' \
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192 | -e '190 d' \
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193 | -i.orig src/3rdparty/chromium/third_party/webrtc/webrtc.gni</userinput></screen>
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194 |
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195 | <para>
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196 | Install <application>qtwebengine</application> by running the following
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197 | commands:
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198 | </para>
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199 |
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200 | <screen><userinput>mkdir build &&
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201 | cd build &&
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202 |
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203 | cmake -D CMAKE_MESSAGE_LOG_LEVEL=STATUS \
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204 | -D QT_FEATURE_webengine_system_ffmpeg=ON \
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205 | -D QT_FEATURE_webengine_system_icu=ON \
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206 | -D QT_FEATURE_webengine_system_libevent=ON \
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207 | -D QT_FEATURE_webengine_proprietary_codecs=ON \
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208 | -D QT_FEATURE_webengine_webrtc_pipewire=ON \
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209 | -D QT_BUILD_EXAMPLES_BY_DEFAULT=OFF \
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210 | -G Ninja .. &&
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211 |
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212 | ninja</userinput></screen>
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213 |
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214 | <para>
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215 | This package does not come with a test suite.
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216 | </para>
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217 |
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218 | <para>
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219 | Now, as the <systemitem class="username">root</systemitem> user:
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220 | </para>
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221 |
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222 | <screen role="root"><userinput>ninja install</userinput></screen>
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223 |
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224 | <!-- EDITORS NOTE: If you are updating this package, use INSTALL_ROOT=
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225 | instead of DESTDIR= Not sure this is valid any more with version 6.6.2 -->
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226 | </sect2>
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227 |
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228 | <sect2 role="commands">
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229 | <title>Command Explanations</title>
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230 |
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231 | <para>
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232 | <parameter>CMAKE_MESSAGE_LOG_LEVEL=STATUS</parameter>: Output
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233 | interesting messages that project users might be interested in.
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234 | Ideally these should be concise, no more than a single line,
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235 | but still informative.
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236 | </para>
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237 |
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238 | <para>
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239 | <parameter>QT_FEATURE_webengine_system_*</parameter>: Specify what
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240 | external packages the system should use.
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241 | </para>
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242 |
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243 | <para>
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244 | <parameter>QT_BUILD_EXAMPLES_BY_DEFAULT=OFF</parameter>: Do not build
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245 | examples by default.
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246 | </para>
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247 |
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248 | <para>
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249 | <option>NINJAJOBS=4 make</option>: If you patched system ninja in LFS to
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250 | recognize the NINJAJOBS environment variable, this command will run system
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251 | ninja with the specified number of jobs (i.e. 4).
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252 | There are several reasons why you might want to use options like this this:
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253 | </para>
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254 |
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255 | <itemizedlist>
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256 | <listitem>
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257 | <para>
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258 | Building on a subset of CPUs allows measuring the build time
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259 | for a smaller number of processors, and/or running other
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260 | CPU-intensive tasks at the same time. For an editor on a machine
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261 | with a lot of CPUs, trying to measure the build time for a 4-CPU
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262 | machine, <option>NINJAJOBS=4 make</option> will give a reasonable
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263 | approximation (there is a short period where N+2 python and node
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264 | jobs run).
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265 | </para>
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266 | </listitem>
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267 | <listitem>
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268 | <para>
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269 | On a machine with only 4 CPUs online, the default of scheduling
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270 | N+2 jobs for qtwebengine is slower by between 3% and 7%, probably
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271 | because of the size of the C++ files and their many includes and
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272 | templates. Therefore, if in doubt set NINJAJOBS to the number of CPUs.
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273 | </para>
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274 | </listitem>
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275 | <listitem>
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276 | <para>
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277 | Reducing the number of cores being used on long running, CPU
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278 | intensive packages may alleviate heat problems.
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279 | </para>
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280 | </listitem>
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281 | <listitem>
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282 | <para>
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283 | Reducing the number of cores will prevent potential out-of-memory
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284 | problems on systems that do not have enough memory (or swap)
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285 | when all cores are active. A suggested approach is to limit
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286 | the number of cores to about one core for each 1.5 GB of
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287 | combined RAM and swap space.
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288 | </para>
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289 | </listitem>
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290 | </itemizedlist>
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291 |
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292 | </sect2>
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293 |
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294 | <sect2 role="configuration">
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295 | <title>Configuring QtWebEngine</title>
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296 |
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297 | <sect3 id="qtwebengine-config">
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298 | <title>Configuration Information</title>
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299 |
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300 | <para>
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301 | If you are upgrading from an older minor version of this
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302 | application, for some webpages to load you may need to
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303 | clear the <emphasis>browser</emphasis> caches, e.g. for
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304 | <application>falkon</application> they will be found in
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305 | <filename class="directory">~/.cache/falkon/</filename>.
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306 | You will need to do this if the browser starts to render
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307 | the page and then changes to a blank tab with a message
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308 | that something went wrong, and a button to Retry. Even
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309 | after removing the old caches, you may need to retry a
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310 | few times for each affected tab.
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311 | </para>
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312 |
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313 | <para>
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314 | If a browser using this package fails to run and when run
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315 | from a term it reports 'Trace/breakpoint trap' that is
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316 | probably a kernel configuration issue - there is no need
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317 | to rebuild QtWebEngine, see the next section, recompile
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318 | the kernel and reboot to the new kernel.
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319 | </para>
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320 |
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321 | </sect3>
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322 |
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323 | </sect2>
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324 |
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325 | <sect2 role="kernel" id="qtwebengine-kernel">
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326 | <title>Kernel Configuration</title>
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327 |
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328 | <para>
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329 | This package does not require any of the optional kernel namespace items,
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330 | but if User namespace is enabled <phrase revision="systemd">(as happens
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331 | in some unit files, for hardening)</phrase> PID namespace must also be
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332 | enabled. In that case enable the following options in the kernel
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333 | configuration and recompile the kernel if necessary:
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334 | </para>
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335 |
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336 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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337 | href="qtwebengine-kernel.xml"/>
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338 |
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339 | <indexterm zone="qtwebengine qtwebengine-kernel">
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340 | <primary sortas="d-qtwebengine">qtwebengine</primary>
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341 | </indexterm>
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342 | </sect2>
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343 |
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344 | <sect2 role="content">
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345 | <title>Contents</title>
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346 |
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347 | <segmentedlist>
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348 | <segtitle>Installed Programs</segtitle>
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349 | <segtitle>Installed Libraries</segtitle>
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350 | <segtitle>Installed Directories</segtitle>
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351 |
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352 | <seglistitem>
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353 | <seg>
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354 | qtwebengine_convert_dict and
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355 | QtWebEngineProcess (both in $QT6DIR/libexec)
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356 | </seg>
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357 | <seg>
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358 | libQt6Pdf.so,
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359 | libQt6PdfQuick.so,
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360 | libQt6PdfWidgets.so,
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361 | libQt6WebEngineCore.so,
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362 | libQt6WebEngineiQuick.so,
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363 | libQt6WebEngineQuickDelegatesQml.so, and
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364 | libQt6WebEngineWidgets.so
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365 | </seg>
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366 | <seg>
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367 | $QT6DIR/include/QtPdf,
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368 | $QT6DIR/include/QtPdfQuick,
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369 | $QT6DIR/include/QtPdfWidgets,
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370 | $QT6DIR/include/QtWebEngineCore,
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371 | $QT6DIR/include/QtWebEngineQuick,
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372 | $QT6DIR/include/QtWebEngineWidgets,
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373 | $QT6DIR/qml/QtWebEngine, and
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374 | $QT6DIR/translations/qtwebengine_locales
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375 | </seg>
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376 | </seglistitem>
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377 | </segmentedlist>
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378 |
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379 | <variablelist>
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380 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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381 | <?dbfo list-presentation="list"?>
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382 | <?dbhtml list-presentation="table"?>
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383 |
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384 | <varlistentry id="qtwebengine_convert_dict">
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385 | <term><command>qtwebengine_convert_dict</command></term>
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386 | <listitem>
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387 | <para>
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388 | converts hunspell dictionaries (<literal>.dic</literal>) to chromium
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389 | format (<literal>.bdic</literal>)
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390 | </para>
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391 | <indexterm zone="qtwebengine qtwebengine_convert_dict">
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392 | <primary sortas="b-qtwebengine_convert_dict">qtwebengine_convert_dict</primary>
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393 | </indexterm>
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394 | </listitem>
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395 | </varlistentry>
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396 |
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397 | <varlistentry id="QtWebEngineProcess">
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398 | <term><command>QtWebEngineProcess</command></term>
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399 | <listitem>
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400 | <para>
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401 | is a libexec program which runs a zygote process (one that listens
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402 | for spawn requests from a master process and will fork itself in
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403 | response)
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404 | </para>
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405 | <indexterm zone="qtwebengine QtWebEngineProcess">
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406 | <primary sortas="b-QtWebEngineProcess">QtWebEngineProcess</primary>
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407 | </indexterm>
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408 | </listitem>
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409 | </varlistentry>
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410 | <!--
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411 | <varlistentry id="libQtWebEngine-lib">
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412 | <term><filename class="libraryfile">libQtWebEngine.so</filename></term>
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413 | <listitem>
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414 | <para>
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415 | provides QML types for rendering web content within a QML application
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416 | </para>
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417 | <indexterm zone="qtwebengine libQtWebEngine-lib">
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418 | <primary sortas="c-libQtWebEngine">libQtWebEngine.so</primary>
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419 | </indexterm>
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420 | </listitem>
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421 | </varlistentry>
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422 |
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423 | <varlistentry id="libQtWebEngineCore">
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424 | <term><filename class="libraryfile">libQtWebEngineCore.so</filename></term>
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425 | <listitem>
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426 | <para>
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427 | provides public API shared by both QtWebEngine and QtWebEngineWidgets
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428 | </para>
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429 | <indexterm zone="qtwebengine libQtWebEngineCore">
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430 | <primary sortas="c-libQtWebEngineCore">libQtWebEngineCore.so</primary>
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431 | </indexterm>
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432 | </listitem>
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433 | </varlistentry>
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434 |
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435 | <varlistentry id="libQtWebEngineWidgets">
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436 | <term><filename class="libraryfile">libQtWebEngineWidgets.so</filename></term>
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437 | <listitem>
|
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438 | <para>
|
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439 | provides a web browser engine as well as C++ classes to render and
|
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440 | interact with web content
|
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441 | </para>
|
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442 | <indexterm zone="qtwebengine libQtWebEngineWidgets">
|
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443 | <primary sortas="c-libQtWebEngineWidgets">libQtWebEngineWidgets.so</primary>
|
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444 | </indexterm>
|
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445 | </listitem>
|
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446 | </varlistentry>
|
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447 | -->
|
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448 | </variablelist>
|
---|
449 | </sect2>
|
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450 |
|
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451 | </sect1>
|
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