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V8Js on MacOS

Installation of V8Js on MacOS is pretty much straight forward.

If you have brew around, just brew install php70-v8js (or php71-v8js / php72-v8js depending on your PHP version) and you should be done. This will install a recent version of V8 along with this extension.

Otherwise you need to compile latest v8 manually.

Compile latest v8

cd /tmp

# Install depot_tools first (needed for source checkout)
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=`pwd`/depot_tools:"$PATH"

# Download v8
fetch v8
cd v8

# (optional) If you'd like to build a certain version:
git checkout 3.32.6
gclient sync

# Compile V8 (using up to 8 CPU cores, requires a lot of RAM, adapt as needed)
make native library=shared -j8

# Install to /usr
mkdir -p /usr/local/lib /usr/local/include
cp out/native/lib*.dylib /usr/local/lib/
cp out/native/libv8_*.a  /usr/local/lib/
cp -R include/* /usr/local/include

You cannot install the libraries to any location you want since they have a install name that is baked into the library. You can check the install name with otool -D out/native/libv8.dylib.

During the build snapshot generation may fail like so:

ACTION tools_gyp_v8_gyp_v8_snapshot_target_run_mksnapshot /Users/vagrant/v8/out/native/obj.target/v8_snapshot/geni/snapshot.cc
dyld: Library not loaded: /usr/local/lib/libicui18n.dylib
  Referenced from: /Users/vagrant/v8/out/native/mksnapshot
  Reason: image not found
/bin/sh: line 1: 18964 Trace/BPT trap: 5       "/Users/vagrant/v8/out/native/mksnapshot" --log-snapshot-positions --logfile "/Users/vagrant/v8/out/native/obj.target/v8_snapshot/geni/snapshot.log" --random-seed 314159265 "/Users/vagrant/v8/out/native/obj.target/v8_snapshot/geni/snapshot.cc"
make[1]: *** [/Users/vagrant/v8/out/native/obj.target/v8_snapshot/geni/snapshot.cc] Error 133
make: *** [native] Error 2

... if that happens, just copy libicu*.dylib to /usr/local/lib already and start make again (then simply continue with installation):

cp out/native/libicu*.dylib /usr/local/lib/
make native library=shared -j8

Compile php-v8js itself

If you're using Apple LLVM compiler (instead of gcc) you need to pass the -Wno-c++11-narrowing flag. Otherwise compilation fails due to narrowing errors in PHP itself, which LLVM is much pickier with (compared to gcc).

cd /tmp
git clone https://github.com/phpv8/v8js.git
cd v8js
phpize
./configure CXXFLAGS="-Wno-c++11-narrowing"
make
make test
make install

V8Js' build system assumes that the icudtl.dat file is located next to the libv8.dylib library file and compiles the path into the library itself. If for whatever reason the icudtl.dat file is stored at a different place during runtime, you need to set the php.ini variable v8js.icudtl_dat_path to point to the file. Otherwise locale-aware features of V8 will not work as expected.