Why isn't my cocoapods post_install hook updating my preprocessor macros?

Question

I've been going round and round for a couple days now trying to figure out why my post_install hook isn't producing the output I'm expecting. Here's my Podfile:

source 'https://github.com/CocoaPods/Specs.git'

target "SCCommon" do
  platform :ios, "6.0"
  pod 'AFNetworking', '~> 1.2.1'
  pod 'Mantle', '~> 1.3'
  pod 'PubNub', '3.5.5'
end

target "SCCommon-TestHarness" do
  platform :ios, "6.0"
# inhibit_all_warnings!
  pod 'SCCommon', :path => '../SCCommon.podspec'
end

target "SCCommon-UnitTests" do
  platform :ios, "6.0"
# inhibit_all_warnings!
  pod 'OCMock', '2.2.3'
  pod 'SCCommon', :path => '../SCCommon.podspec'
end

post_install do |installer_representation|
  installer_representation.project.targets.each do |target|
    if target.name == 'Pods-SCCommon-UnitTests'
      puts "Setting preprocessor macro for #{target.name}..."
      target.build_configurations.each do |config|
        puts "#{config} configuration..."
        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= ['$(inherited)','SC_DEBUG_SCCOMMON=1','FOOBAR']
        puts config.build_settings['GCC_PREPROCESSOR_DEFINITIONS']
        puts '---'
      end
    end
  end
end

After running pod update on the above, I get the following output:

Update all pods
Analyzing dependencies

CocoaPods 0.35.0 is available.
To update use: `sudo gem install cocoapods`

For more information see http://blog.cocoapods.org
and the CHANGELOG for this version http://git.io/BaH8pQ.

Fetching podspec for `SCCommon` from `../SCCommon.podspec`
Downloading dependencies
Using AFNetworking (1.2.1)
Using Mantle (1.5.1)
Using OCMock (2.2.3)
Using PubNub (3.5.5)
Using SCCommon (0.3)
Generating Pods project
Setting preprocessor macro for Pods-SCCommon-UnitTests...
Release configuration...
$(inherited)
SC_DEBUG_SCCOMMON=1
FOOBAR
---
Debug configuration...
DEBUG=1
$(inherited)
---
Integrating client project

The question I have is: Why isn't the Debug configuration updating with the new macro definitions? You can see in the output that the Release configuration is setup correctly, but not Debug.

Any ideas?

Answer 1

Found the answer to my specific issue in the way I was adding macros. I had to break the config.build_settings ... line into two lines like so:

post_install do |installer_representation|
  installer_representation.project.targets.each do |target|
    if target.name == 'Pods-SCCommon-UnitTests-SCCommon'
      puts "Setting preprocessor macro for #{target.name}..."
      target.build_configurations.each do |config|
        puts "#{config} configuration..."
        puts "before: #{config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'].inspect}"
        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= ['$(inherited)']
        config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] << 'SC_DEBUG_SCCOMMON'
        puts "after: #{config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'].inspect}"
        puts '---'
      end
    end
  end
end

As a side note, I was also setting the definition on the wrong target. Now that both of those issues are resolved, I am officially unstuck! Yay!