Building V8 from source is a huge task for my Mac

Took me an hour finally done...

mac@nico v8 % ./tools/dev/gm.py x64.optdebug
# mkdir -p out/x64.optdebug
# echo > out/x64.optdebug/args.gn << EOF
is_component_build = true
is_debug = true
symbol_level = 1
target_cpu = "x64"
v8_enable_sandbox = true
v8_enable_backtrace = true
v8_enable_fast_mksnapshot = true
v8_enable_verify_heap = true
v8_optimized_debug = true
EOF
# gn gen out/x64.optdebug
Done. Made 741 targets from 215 files in 2714ms
# autoninja -C out/x64.optdebug d8
ninja: Entering directory `out/x64.optdebug'
[1339/2355] CXX obj/torque_generated_initializers/set-symmetric-difference-tq-csa.o

[1429/2355] CXX obj/torque_generated_initializers/megadom-handler-tq-csa.o



[2355/2355] LINK ./d8
Done! - V8 compilation finished successfully.