Ok so did this to the .gclient file 1 directory up:
solutions = [
  {
    "url": "https://chromium.googlesource.com/v8/v8.git";,
    "managed": False,
    "name": "v8",
    "deps_file": "DEPS",
    "custom_deps": {},
"target_os" : ['android', 'mac']
  },
]

Then: gclient sync
Then  tools/dev/v8gen.py arm.release

Then this in args.gn
is_debug = false
target_cpu = "arm"
v8_target_cpu = "arm"
target_os="android"

Then:

ninja -C out.gn/arm.release/


This error persists:

mindyp-macbookpro:v8 mindyp$ ninja -C out.gn/arm.release/

ninja: Entering directory `out.gn/arm.release/'

[1/1] Regenerating ninja files

FAILED: build.ninja 

/Users/mindyp/local/src/v8/buildtools/mac/gn 
--root=/Users/mindyp/local/src/v8 -q --check gen .

ERROR Unresolved dependencies.

//:run_mkpeephole(//build/toolchain/android:android_arm)

  needs //:mkpeephole(//build/toolchain/mac:clang_x86_v8_arm)

//:run_mksnapshot(//build/toolchain/android:android_arm)

  needs //:mksnapshot(//build/toolchain/mac:clang_x86_v8_arm)


ninja: error: rebuilding 'build.ninja': subcommand failed

[1]+  Done                    mate ../.gclient






On Thursday, December 22, 2016 at 11:46:38 PM UTC-8, Jochen Eisinger wrote:
>
> hey,
>
> to build for android, you should add target_os = "android" and target_cpu 
> = "arm".
>
> you'll also have to add target_os = ['android', 'mac'] to your .gclient 
> file (which should be one level up from your v8 checkout), so gclient sync 
> will download the android specific deps
>
> hth
> -jochen
>
> On Thu, Dec 22, 2016 at 5:41 PM 'Mindy DelliCarpini' via v8-users <
> [email protected] <javascript:>> wrote:
>
>> Need a V8 build for our prototyping tool (boom.googleplex.com). The tool 
>> runs with a Mac simulator, so the build has to be completed on a Mac.
>>
>> The TOT v8 builds are broken for Mac, and also for building static full 
>> libraries (no the thin .a files, which wouldn't be shareable)
>>
>> I'm interested in getting any of the following working (preference for 
>> Mac build, but I know its not a common thing)
>>
>> 1) *Build v8 on my mac*
>> Tried old instructions, but failed with missing libraries (standard c++?)
>> https://github.com/v8/v8/wiki/D8-on-Android
>> Tried new instructions:
>> tools/dev/v8gen.py arm.release
>> Added: target_os=arm
>> Getting this failure:
>>
>> /Users/mindyp/local/src/v8/buildtools/mac/gn 
>> --root=/Users/mindyp/local/src/v8 -q --check gen .
>>
>> ERROR Unresolved dependencies.
>>
>> //:run_mkpeephole(//build/toolchain/android:android_arm)
>>
>>   needs //:mkpeephole(//build/toolchain/mac:clang_x86_v8_arm)
>>
>> //:run_mksnapshot(//build/toolchain/android:android_arm)
>>
>>   needs //:mksnapshot(//build/toolchain/mac:clang_x86_v8_arm)
>>
>>
>> 2) *Full static library build on Linux that is not just the .a, so I can 
>> transfer it to my mac*
>> Followed: 
>> http://linuxplayer.org/2013/12/how-to-build-v8-static-library
>> But this breaks during the LD phase
>> Added: https://bugs.chromium.org/p/v8/issues/detail?id=5617#c1
>>  (LDFLAGS=-lc++)
>> Still broken
>>
>> -- 
>> -- 
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>> [email protected] <javascript:>
>> http://groups.google.com/group/v8-users
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