[pi8] Building S8VM on the Pi

	V8 VM build on the Pi is broken. Canīt build a fresh shell on the Pi
Jun 07,2017	See https://bugs.chromium.org/p/v8/issues/detail?id=6458

Start building V8 from sources on the Pi

• Install depot_tools (~25Mb) with

  cd ~
  git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

• Fetch the V8 sources with

  export PATH=~/depot_tools:$PATH
  fetch v8

  Note that if you already downloaded V8 you should update with

  cd ~/v8
  git pull origin master
  gclient sync

• Start the build with gn as reccomended here
  It should be the following code (See Notes on this page):

  tools/dev/v8gen.py arm.release

Trying to build V8 on the Pi with gyp

• Update projects

  python gypfiles/gyp_v8

• how to build?
  • please check..(from make)...................

    # arm specific flags.
    GYPFLAGS += -Darm_version=7
    GYPFLAGS += -Darm_float_abi=hard
    
    
    # fpu: armfpu=xxx
    # xxx: vfp, vfpv3-d16, vfpv3, neon.
    ifeq ($(armfpu),)
      GYPFLAGS += -Darm_fpu=default
    else
      GYPFLAGS += -Darm_fpu=$(armfpu)
    endif
    # float abi: armfloatabi=softfp/hard
    ifeq ($(armfloatabi),)
    ifeq ($(hardfp),)
      GYPFLAGS += -Darm_float_abi=default
    endif
    else
      GYPFLAGS += -Darm_float_abi=$(armfloatabi)
    endif

Add the S8VM sources

There is a bug building required tools to build V8 on the Pi. See https://bugs.chromium.org/p/v8/issues/detail?id=6458

Notes

cd v8
make native -j 4 hardfp=on vf3p=off