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Update README.Linux.md for snapshot usage

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Stefan Siegl 2016-03-05 17:09:34 +01:00
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README.Linux.md
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@ -10,7 +10,23 @@ years ago, since Node.js requires such an old version.
This means that you usually need to compile v8 on your own before
you can start to compile & install v8js itself.
Compile latest v8
Snapshots
---------
V8 has (optional) support for so-called snapshots which speed up startup
performance drastically. Hence they are generally recommended for use.
There are two flavours of snapshots: internal & external.
Internal snapshots are built right into the V8 library (libv8.so file),
so there's no need to handle them specially.
Besides there are external snapshots (which are enabled unless configured
otherwise). If V8 is compiled with these, then V8Js needs to provide two
"binary blobs" to V8, named `natives_blob.bin` and `snapshot_blob.bin`.
In that case copy those two files to `/usr/share/v8/...`.
Compile latest V8
-----------------
```
@ -25,11 +41,15 @@ fetch v8
cd v8
# (optional) If you'd like to build a certain version:
git checkout 3.32.6
git checkout 4.9.385.28
gclient sync
# Build (disable snapshots for V8 > 4.4.9.1)
make native library=shared snapshot=off -j8
# use libicu of operating system
export GYP_DEFINES="use_system_icu=1"
# Build (with internal snapshots)
export GYPFLAGS="-Dv8_use_external_startup_data=0"
make native library=shared snapshot=on -j8
# Install to /usr
sudo mkdir -p /usr/lib /usr/include
@ -40,16 +60,9 @@ echo -e "create /usr/lib/libv8_libplatform.a\naddlib out/native/obj.target/tools
Then add `extension=v8js.so` to your php.ini file. If you have a separate configuration for CLI, add it there also.
* If the V8 library is newer than 4.4.9.1 you need to pass `snapshot=off` to
`make`, otherwise the V8 library will not be usable
(see V8 [Issue 4192](https://code.google.com/p/v8/issues/detail?id=4192))
* If you don't want to overwrite the system copy of v8, replace `/usr` in
the above commands with some other path like `/opt/v8` and then add
`--with-v8js=/opt/v8` to the php-v8js `./configure` command below.
* If you do that with a v8 library of 4.2 branch or newer, then you need
to fix the RUNPATH header in the v8js.so library so the libicui18n.so
is found. By default it is set to `$ORIGIN/lib.target/`, however the files
lie side by side. Use `chrpath -r '$ORIGIN' libv8.so` to fix.
`libv8_libplatform.a` should not be copied directly since it's a thin
archive, i.e. it contains only pointers to the build objects, which
@ -62,7 +75,7 @@ Compile php-v8js itself
```
cd /tmp
git clone https://github.com/preillyme/v8js.git
git clone https://github.com/phpv8/v8js.git
cd v8js
phpize
./configure