QtWebEngine-20210401

Installation of qtwebengine

First, as the root user, create the python symlink:

ln -svf /usr/bin/python{2,}

Now apply a patch to fix several issues that can prevent the build working:

patch -Np1 -i ../qtwebengine-20210401-build_fixes-1.patch

Although the patch has ensured that git is not invoked during the build, the build system has labyrinthine rules of byzantine complexity, and in particular trying to build without two .git directories will lead to it eventually falling into unexpected and unbuildable code which references a private header that has not been created. Avoid this by creating the required directories:

mkdir -pv .git src/3rdparty/chromium/.git

Because this version of qtwebengine is aimed at a later release than the current public releases, change it to build for qt-5.15.2 using a sed:

sed -e '/^MODULE_VERSION/s/5.*/5.15.2/' -i .qmake.conf

Now, ensure that the local headers are available when not building as part of the complete Qt-5.15.2:

find -type f -name "*.pr[io]" |
  xargs sed -i -e 's|INCLUDEPATH += |&$$QTWEBENGINE_ROOT/include |'

Next, allow the pulseaudio library to be linked at build time, instead of run time. This also prevents an issue with newer pulseaudio:

sed -e '/link_pulseaudio/s/false/true/' \
    -i src/3rdparty/chromium/media/media_options.gni

Finally, fix a change in the build system which allows its developers to pass e.g. -j20 to make (for quick tests of some areas) but breaks the build with LFS's use of the NINJAJOBS environment variable:

sed -i 's/NINJAJOBS/NINJA_JOBS/' src/core/gn_run.pro

If an older version of the package's main library has been installed, when the package is built separately it will link to that in preference to its own not-yet-installed version, and fail because of missing symbols. Prevent that by, as the root user, moving the symlink out of the way:

if [ -e ${QT5DIR}/lib/libQt5WebEngineCore.so ]; then
  mv -v ${QT5DIR}/lib/libQt5WebEngineCore.so{,.old}
fi

Install qtwebengine by running the following commands:

mkdir build &&
cd    build &&

qmake .. -- -system-ffmpeg -webengine-icu &&
make

This package does not come with a test suite.

Now, as the root user:

make install

Remove references to the build directory from installed library dependency (prl) files by running the following commands as the root user:

find $QT5DIR/ -name \*.prl \
   -exec sed -i -e '/^QMAKE_PRL_BUILD_DIR/d' {} \;

Finally, as the root user, remove the python symlink:

rm -v /usr/bin/python

General setup --->
  -*- Namespaces support --->
    [ ]     User namespace                    [CONFIG_USER_NS]
    [*]     PID namespace                     [CONFIG_PID_NS]