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2ab2549d02
Previously, it was appended using `echo >>`. However, that wasn't picked up by `ninja` since it would've required an intermediary `gn gen out.gn/x64.release` step. By passing the additional build flag directly to `v8gen.py`, we ensure that `ninja` picks it up.
140 lines
4.0 KiB
Markdown
140 lines
4.0 KiB
Markdown
V8Js on GNU/Linux
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=================
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Installation of V8Js on GNU/Linux is pretty much straight forward.
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The biggest hurdle actually is that you need a rather new v8 library.
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However most distributions still ship the rusty version 3.14, publish
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years ago, since Node.js requires such an old version.
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This means that you usually need to compile v8 on your own before
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you can start to compile & install v8js itself.
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It is recommended to install the V8 version for V8Js off your system's
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load path, so it doesn't interfere with the V8 library shipped with your
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system's distribution.
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Snapshots
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---------
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V8 has (optional) support for so-called snapshots which speed up startup
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performance drastically. Hence they are generally recommended for use.
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There are two flavours of snapshots: internal & external.
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Internal snapshots are built right into the V8 library (libv8.so file),
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so there's no need to handle them specially.
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Besides there are external snapshots (which are enabled unless configured
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otherwise). If V8 is compiled with these, then V8Js needs to provide two
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"binary blobs" to V8, named `natives_blob.bin` and `snapshot_blob.bin`.
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In that case copy those two files to the same directory `libv8.so` was
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installed to.
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Compile V8 5.6 and newer (using GN)
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-----------------------------------
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```
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# Install required dependencies
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sudo apt-get install build-essential git python libglib2.0-dev
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cd /tmp
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# Install depot_tools first (needed for source checkout)
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git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
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export PATH=`pwd`/depot_tools:"$PATH"
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# Download v8
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fetch v8
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cd v8
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# (optional) If you'd like to build a certain version:
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git checkout 5.6.326.12
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gclient sync
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# Setup GN
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tools/dev/v8gen.py -vv x64.release -- is_component_build=true
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# Build
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ninja -C out.gn/x64.release/
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# Install to /opt/v8/
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sudo mkdir -p /opt/v8/{lib,include}
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sudo cp out.gn/x64.release/lib*.so out.gn/x64.release/*_blob.bin /opt/v8/lib/
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sudo cp -R include/* /opt/v8/include/
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```
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Compile V8 versions 5.5 and older (using Gyp)
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---------------------------------------------
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```
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# Install `build-essential` if you haven't already:
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sudo apt install build-essential
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# Install `chrpath` for fixing libv8.so's RUNPATH header, if you haven't already:
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sudo apt install chrpath
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cd /tmp
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# Install depot_tools first (needed for source checkout)
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git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
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export PATH=`pwd`/depot_tools:"$PATH"
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# Download v8
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fetch v8
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cd v8
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# (optional) If you'd like to build a certain version:
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git checkout 4.9.385.28
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gclient sync
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# Build (with internal snapshots)
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export GYPFLAGS="-Dv8_use_external_startup_data=0"
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# Force gyp to use system-wide ld.gold
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export GYPFLAGS="${GYPFLAGS} -Dlinux_use_bundled_gold=0"
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# Compile V8 (using up to 8 CPU cores, requires a lot of RAM, adapt as needed)
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make native library=shared snapshot=on -j8
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# Install to /opt/v8
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sudo mkdir -p /opt/v8/{lib,include}
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sudo cp out/native/lib.target/lib*.so /opt/v8/lib/
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sudo cp -R include/* /opt/v8/include
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# Fix libv8.so's RUNPATH header
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sudo chrpath -r '$ORIGIN' /opt/v8/lib/libv8.so
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# Install libv8_libplatform.a (V8 >= 5.2.51)
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echo -e "create /opt/v8/lib/libv8_libplatform.a\naddlib out/native/obj.target/src/libv8_libplatform.a\nsave\nend" | sudo ar -M
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# ... same for V8 < 5.2.51, libv8_libplatform.a is built in tools/gyp directory
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echo -e "create /opt/v8/lib/libv8_libplatform.a\naddlib out/native/obj.target/tools/gyp/libv8_libplatform.a\nsave\nend" | sudo ar -M
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```
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`libv8_libplatform.a` should not be copied directly since it's a thin
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archive, i.e. it contains only pointers to the build objects, which
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otherwise must not be deleted. The simple mri-script converts the
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thin archive to a normal archive.
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Compile php-v8js itself
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-----------------------
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```
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cd /tmp
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git clone https://github.com/phpv8/v8js.git
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cd v8js
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phpize
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./configure --with-v8js=/opt/v8
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make
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make test
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sudo make install
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```
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Then add `extension=v8js.so` to your php.ini file. If you have a separate configuration for CLI, add it there also.
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