86 lines
4.0 KiB
Markdown
86 lines
4.0 KiB
Markdown
<!---
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NOTE: This file describes how to build Collabora Online as WASM
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without using the Allotropia container.
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-->
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# Collabora Online as WASM (COWASM)
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Before building Collabora Online as WASM you need to build three
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dependencies: LibreOffice core, Poco, and zstd.
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The toolchain used is Emscripten. Versions 2.0.31 and 3.1.30 are known
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to work. The examples below assume 3.1.30.
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Below we assume that the Emscripten environment is already set up,
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that you have sourced the emsdk_env.sh file in your shell.
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## Build LibreOffice core
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Use the master branch of LibreOffice core. The feature/wasm branch is
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not needed any longer, all commits to that branch are currently also
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present in the master branch.
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See the static/README.wasm.md file in LibreOffice core, especially the
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section "Building headless LibreOffice as WASM for use in another
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product".
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## Build other Online dependencies
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### zstd
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Build libzstd with assembly code disable, and using the Makefile (didn't try its other build systems):
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tar -xzvf ~/Downloads/zstd-1.5.2.tar.gz
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cd zstd-1.5.2/
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emmake make CC='emcc -pthread -fexceptions -s DISABLE_EXCEPTION_CATCHING=0' CXX='em++ -pthread -fexceptions -s DISABLE_EXCEPTION_CATCHING=0' lib-mt V=1 ZSTD_NO_ASM=1 PREFIX=/opt/zstd.emsc.3.1.30
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(cd lib && emmake make install-static install-includes ZSTD_NO_ASM=1 PREFIX=/opt/zstd.emsc.3.1.30)
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This will install the zstd headers and libraries in `/opt/zstd.emsc.3.1.30`.
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### Poco
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Poco requires two patches plus renaming one source file (which
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actually is from expat but Poco includes). Note that the header
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Poco/Platform.h maps EMSCRIPTEN to POCO_OS_LINUX. It has both
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Makefiles and CMake but I couldn't get CMake to work. Online requires
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a single include directory so "make install" must be used.
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Here we assume that the online repo is cloned at `$HOME/lo/online`,
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adapt as necessary.
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tar -xzvf ~/Downloads/poco-1.12.4-release.tar.gz
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cd poco-poco-1.12.4-release
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patch -p1 < $HOME/lo/online/wasm/poco-1.12.4-emscripten.patch
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mv XML/src/xmlparse.cpp XML/src/xmlparse.c
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patch -p0 < $HOME/lo/online/wasm/poco-no-special-expat-sauce.diff
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emconfigure ./configure --static --no-samples --no-tests --omit=Crypto,NetSSL_OpenSSL,JWT,Data,Data/SQLite,Data/ODBC,Data/MySQL,Data/PostgreSQL,Zip,PageCompiler,PageCompiler/File2Page,MongoDB,Redis,ActiveRecord,ActiveRecord/Compiler,Prometheus
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emmake make CC=emcc CXX=em++ CXXFLAGS="-DPOCO_NO_LINUX_IF_PACKET_H -DPOCO_NO_INOTIFY -pthread -s USE_PTHREADS=1 -fexceptions -s DISABLE_EXCEPTION_CATCHING=0"
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make install INSTALLDIR=/opt/poco.emsc.3.1.30
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This will install into `/opt/poco.emsc.3.1.30`.
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## Build Online itself
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# 1. Update the directories in the command below to match your system.
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# 2. Make sure that a document called sample.docx exists in the root of
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# the directory set as --with-wasm-additional-files.
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./autogen.sh
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emconfigure ./configure --disable-werror --with-lokit-path=/home/tml/lo/core-cool-wasm/include --with-lo-path=/home/tml/lo/core-cool-wasm/instdir --with-lo-builddir=/home/tml/lo/core-cool-wasm --with-zstd-includes=/opt/zstd.emsc.3.1.30/include --with-zstd-libs=/opt/zstd.emsc.3.1.30/lib --with-poco-includes=/opt/poco.emsc.3.1.30/include --with-poco-libs=/opt/poco.emsc.3.1.30/lib --host=wasm32-local-emscripten --with-wasm-additional-files=/home/tml/lo/online-hacking/my-sample-docs
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emmake make CC=emcc CXX=em++
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## Running WASM Online
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Once the build is done, copy the browser/dist to a safe locataion.
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E.g. cp -a browser/dist dist_wasm
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Next, re-configure Online and rebuild with normal config/settings (i.e. without WASM).
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Alternatively, you may have opted to build WASM in a separate directory.
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Either way, in the normal Online build directory, copy the wasm dist directory
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into the browser/dist, like this:
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cp -a dist_wasm browser/dist/wasm
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Now point your browser to https://localhost:9980/browser/c85d8681f3/wasm.html?file_path=/some/unused/path
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Notice that as of now, only the default sample.docx will be loaded.
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But the above steps should get one up and running.
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