QtWebEngine-5.15.16

Installation of qtwebengine

Apply a patch to fix several issues that can prevent the build from completing, and to force it to use python3:

patch -Np1 -i ../qtwebengine-5.15.16-build_fixes-1.patch

If building with system FFmpeg-6.1 as the editors recommend, apply a patch that resolves problems when building with ffmpeg-5 and later:

patch -Np1 -i ../qtwebengine-5.15.16-ffmpeg5_fixes-1.patch

Otherwise, fix an issue in shipped ffmpeg causing it fail to build with Binutils 2.41 or later:

sed 's/(uint8_t)\(([^)]*)\|shift\)/\1 \& 0x1F/' \
    -i src/3rdparty/chromium/third_party/ffmpeg/libavcodec/x86/mathops.h

Although the build_fixes 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-5.15.11 using a sed:

sed -e '/^MODULE_VERSION/s/5.*/5.15.11/' -i .qmake.conf

Now, ensure that the local headers are available when not building as part of the complete Qt-5.15.11:

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

Next, fix the build tools so they can be run with Python-3.11+:

sed -e 's/\^(?i)/(?i)^/' \
    -i src/3rdparty/chromium/tools/metrics/ukm/ukm_model.py &&

sed -e "s/'rU'/'r'/" \
    -i src/3rdparty/chromium/tools/grit/grit/util.py

Several fixes are needed for using Python-3.12+: first, either remove references to the removed imp module or replace it with the newer importlib module:

sed -e "/import imp/d"                                                    \
    -i src/3rdparty/chromium/mojo/public/tools/mojom/mojom/fileutil.py    \
       src/3rdparty/chromium/mojo/public/tools/mojom/mojom/parse/lexer.py &&

sed -e "s/import imp/import importlib.util/" \
    -e 's@.*load_source.*@\
    spec = importlib.util.spec_from_file_location(fullname, filepath)\
    mod = importlib.util.module_from_spec(spec);\
    spec.loader.exec_module(mod)\
    return mod@'                             \
    -i src/3rdparty/chromium/components/resources/protobufs/binary_proto_generator.py

Note

In the above instruction, the 4-space indentation of the four lines from spec = ... to return ... is significant, since they are in a Python script.

Remove an obsolete instance of and a reference to the six module:

sed -e /six.move/d \
    -i src/3rdparty/chromium/third_party/protobuf/python/google/protobuf/internal/python_message.py &&

rm -r src/3rdparty/chromium/tools/grit/third_party/six

There is also a workaround needed for ICU-74+:

sed -e 's/^#define BA_LB_COUNT.*$/#define BA_LB_COUNT 40/' \
    -i src/3rdparty/chromium/third_party/blink/renderer/platform/text/text_break_iterator.cc

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

Install qtwebengine by running the following commands:

mkdir build &&
cd    build &&
qmake .. -- -system-ffmpeg -proprietary-codecs -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' {} \;