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Emscripten: Document how Qt builds its own freetype, but we link against LO's

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Change-Id: I6413c64db3d50f163ee9cc4feda395a54aab3cf2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/172012
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
Tested-by: Jenkins
This commit is contained in:
Stephan Bergmann 2024-08-18 15:45:26 +02:00
parent 4f41c19a03
commit e0178cfdba
1 changed files with 12 additions and 0 deletions
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static/README.wasm.md
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@ -102,6 +102,18 @@ Current Qt fails to start the demo webserver: <https://bugreports.qt.io/browse/Q
Use `emrun --serve_after_close` to run Qt WASM demos.
Qt builds some 3rd-party libraries that it brings along (e.g., qt5/qtbase/src/3rdparty/freetype) and
compiles its own code against the C/C++ include files of those 3rd-party libraries. But when we
link LO, we link against our own versions of those libraries' archives (e.g.,
workdir/UnpackedTarball/freetype/instdir/lib/libfreetype.a), not against the Qt ones (e.g.,
$QT5DIR/lib/libqtfreetype.a). This mismatch between the include files that Qt is compiled against,
vs. the archive actually linked in, seems to not cause issues in practice. (If it did, we could
either try to make both Qt and LO link against e.g. -sUSE_FREETYPE from emscripten-ports, or we
could move Qt from a prequisite to a proper external/qt5 LO module built during the LO build, and
hack its configuration to build against LO's exernal/freetype etc. The former approach, building Qt
with -sUSE_FREETYPE, is even tried in qtbase/src/gui/configure.json, but apparently fails for
reasons not studied further yet, cf. Qt's config.log.)
### Setup LO
`autogen.sh` is patched to use emconfigure. That basically sets various