How can I modify OTHER_LDFLAGS via CocoaPods post-install hook?

Question

My project uses CocoaPods and also custom xcconfig files. Until now, this hasn't caused any problems: I've just had to #include the CocoaPods-generated configuration at the end of my custom configuration.

However, I've run into a problem where a need to conditionally specify OTHER_LDFLAGS based on the xcconfig, but I can't figure out how to do this.

As a start, I've tried simply logging the OTHER_LDFLAGS like this, but the flags aren't actually logged:

post_install do |installer_representation|   installer_representation.project.targets.each do |target|     target.build_configurations.each do |config|              name = target.name       puts "Target Found: #{name}"        flags = config.build_settings['OTHER_LDFLAGS']       puts "OTHER_LDFLAGS Found: #{flags}"     end   end end 

The output looks like this:

Target Found: Pods-ProjectName-DependencyName1 OTHER_LDFLAGS Found: # nothing here...? Target Found: Pods-ProjectName-DependencyName2     OTHER_LDFLAGS Found: # again nothing... # etc... Target Found: Pods-ProjectName  # Cool, this is the main target pod OTHER_LDFLAGS Found: # ... 

How can I actually modify OTHER_LDFLAGS via the CocoaPods post-install hook?

Answer 1

I stumbled across the same problem. First I tried to modify OTHER_LDFLAGS with the obvious:

post_install do |installer|     installer.pods_project.targets.each do |target|         if target.name == "Pods-SomeTarget"             puts "Updating #{target.name} OTHER_LDFLAGS"             target.build_configurations.each do |config|                 config.build_settings['OTHER_LDFLAGS'] ||= ['$(inherited)']                 config.build_settings['OTHER_LDFLAGS'] << '-l"AFNetworking"'             end         end     end end 

but it didn't work. The relevant xcconfig didn't get the change. Eventually I found a workaround that works well - first read the relevant xcconfig file content in the post_intall hook, modify it and write it back:

v1.0

post_install do |installer|     installer.pods_project.targets.each do |target|         if target.name == "Pods-SomeTarget"             puts "Updating #{target.name} OTHER_LDFLAGS"             target.build_configurations.each do |config|                 xcconfig_path = config.base_configuration_reference.real_path                 xcconfig = File.read(xcconfig_path)                 new_xcconfig = xcconfig.sub('OTHER_LDFLAGS = $(inherited)', 'OTHER_LDFLAGS = $(inherited) -l"AFNetworking"')                 File.open(xcconfig_path, "w") { |file| file << new_xcconfig }             end         end     end end 

EDIT: Improvement over the v1.0. Instead of operating on xcconfig String content directly, read xccconfig into a build_configuration Hash, modify the hash and then flush it to xcconfig.

v1.5

post_install do |installer|     installer.pods_project.targets.each do |target|         if target.name == "Pods-SomeTarget"             puts "Updating #{target.name} OTHER_LDFLAGS"             target.build_configurations.each do |config|                 xcconfig_path = config.base_configuration_reference.real_path                  # read from xcconfig to build_settings dictionary                 build_settings = Hash[*File.read(xcconfig_path).lines.map{|x| x.split(/\s*=\s*/, 2)}.flatten]                  # modify OTHER_LDFLAGS                 build_settings['OTHER_LDFLAGS'] << '-l"AFNetworking"'                  # write build_settings dictionary to xcconfig                 build_settings.each do |key,value|                   File.open(xcconfig_path, "a") {|file| file.puts key = value}                 end             end         end     end end