Update MacOS instructions

Author: stesie

Diff for: README.MacOS.md

@@ -2,87 +2,22 @@ V8Js on MacOS
 =============
 
 Installation of V8Js on MacOS is pretty much straight forward.
+The ARM-based M1 chips also work just fine.
 
-If you have [brew](https://brew.sh) 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
-```
+You can use [brew](https://brew.sh) to install `v8`.  This provides
+both the library as well as necessary include files in `/opt/homebrew`.
 
 
 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
+./configure --with-v8js=/opt/homebrew CPPFLAGS="-DV8_COMPRESS_POINTERS"
+make -j4
 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.