also cc @jmagman

I'm seeing an error running pod install:

pod install
Ignoring eventmachine-1.2.7 because its extensions are not built.  Try: gem pristine eventmachine --version 1.2.7
Ignoring executable-hooks-1.6.0 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.6.0
Ignoring ffi-1.11.1 because its extensions are not built.  Try: gem pristine ffi --version 1.11.1
Ignoring ffi-1.9.25 because its extensions are not built.  Try: gem pristine ffi --version 1.9.25
Ignoring gem-wrappers-1.4.0 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.4.0
Ignoring http_parser.rb-0.6.0 because its extensions are not built.  Try: gem pristine http_parser.rb --version 0.6.0
Ignoring nokogiri-1.8.5 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.5
Ignoring nokogiri-1.8.4 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.4
Ignoring sassc-2.0.0 because its extensions are not built.  Try: gem pristine sassc --version 2.0.0
Ignoring sassc-1.12.1 because its extensions are not built.  Try: gem pristine sassc --version 1.12.1

[!] Invalid `Podfile` file: cannot load such file -- ../example_module/.ios/Flutter/podhelper.rb.

 #  from /Users/ryjohn/code/github/flutter/samples/experimental/add2app/SimpleIOSExample/Podfile:6
 #  -------------------------------------------
 #  flutter_application_path = '../example_module'
 >  load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
 #  
 #  -------------------------------------------

@johnpryan I ran into the same issue while testing a clone. There's a pod-helper script that's created by flutter create and flutter build, but not meant to be checked in. As a result, if you do a pod install first thing after cloning, the script isn't there and CocoaPods bombs.

I've added a line to the podfile that will run flutter create on your behalf automatically to fix this. Can you pull the latest changes and try again?

@RedBrogdon I'm still running into a missing "podhelper.rb" error.

Here's my steps:

git clone git@github.com:flutter/samples.git
cd samples
git checkout -b RedBrogdon-add2app master
git pull git://github.com/RedBrogdon/samples.git add2app
cd experimental/add2app/SimpleIOSExample/
pod install

Here's the output:

Ignoring eventmachine-1.2.7 because its extensions are not built.  Try: gem pristine eventmachine --version 1.2.7
Ignoring executable-hooks-1.6.0 because its extensions are not built.  Try: gem pristine executable-hooks --version 1.6.0
Ignoring ffi-1.11.1 because its extensions are not built.  Try: gem pristine ffi --version 1.11.1
Ignoring ffi-1.9.25 because its extensions are not built.  Try: gem pristine ffi --version 1.9.25
Ignoring gem-wrappers-1.4.0 because its extensions are not built.  Try: gem pristine gem-wrappers --version 1.4.0
Ignoring http_parser.rb-0.6.0 because its extensions are not built.  Try: gem pristine http_parser.rb --version 0.6.0
Ignoring nokogiri-1.8.5 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.5
Ignoring nokogiri-1.8.4 because its extensions are not built.  Try: gem pristine nokogiri --version 1.8.4
Ignoring sassc-2.0.0 because its extensions are not built.  Try: gem pristine sassc --version 2.0.0
Ignoring sassc-1.12.1 because its extensions are not built.  Try: gem pristine sassc --version 1.12.1
~/code/github/flutter/samples/experimental/add2app/example_module ~/code/github/flutter/samples/experimental/add2app/SimpleIOSExample
Recreating project ....
  example_module.iml (created)
  example_module_android.iml (created)
  .idea/libraries/Flutter_for_Android.xml (created)
  .idea/libraries/Dart_SDK.xml (created)
  .idea/modules.xml (created)
  .idea/workspace.xml (created)
Because every version of flutter_test from sdk depends on pedantic 1.7.0 and example_module depends on pedantic ^1.8.0+1, flutter_test from sdk is forbidden.
So, because example_module depends on flutter_test any from sdk, version solving failed.
Running "flutter pub get" in example_module...                          
pub get failed (1)

[!] Invalid `Podfile` file: cannot load such file -- ../example_module/.ios/Flutter/podhelper.rb.

 #  from /Users/ryjohn/code/github/flutter/samples/experimental/add2app/SimpleIOSExample/Podfile:7
 #  -------------------------------------------
 #  system("pushd #{flutter_application_path} && flutter create . && popd")
 >  load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
 #  
 #  -------------------------------------------

@RedBrogdon I'm still running into a missing "podhelper.rb" error.

Just to confirm, you're on the master channel, right?

@xster Switching to the master channel fixed it.

Now the XCode 10.3 build is failing:

:-1: Unable to load contents of file list: '/Users/ryjohn/code/github/flutter/samples/experimental/add2app/SimpleIOSExample/Pods/Target Support Files/Pods-SimpleIOSExample/Pods-SimpleIOSExample-frameworks-Debug-input-files.xcfilelist' (in target 'SimpleIOSExample')

PTAL.

All comments addressed except for two waiting on replies. The current code builds out of the box on my machine with these steps:

• cd experimental/add2app/SimpleIOSExample
• pod install
• open SimpleIOSExample.xcworkspace
• Run that sucker.

@johnpryan Do you mind checking to see if a fresh copy of this PR builds for you?

for future reference, gem install cocoapods upgraded my cocoapods version to 1.7.5. I was using an older version (something like 1.3)

@jmagman @xster

I went ahead and landed this, because a) it's huge, and b) we need to get the basic project structure in the repo, but the app occasionally segfaults. Would either of you be interested in taking a look with me? 😄

Yes. Please write down all outputs/stacks etc if you ever encounter any.