Stop adding header search paths that do not contain any headers

CHANGELOG.md

@@ -86,6 +86,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#7445](https://github.com/CocoaPods/CocoaPods/pull/7445)
 
+* Stop adding header search paths that do not contain any headers.  
+  [Samuel Giddins](https://github.com/segiddins)
+
 ## 1.4.0 (2018-01-18)
 
 ##### Enhancements

lib/cocoapods/installer/xcode/pods_project_generator/file_references_installer.rb

@@ -135,27 +135,28 @@ module Pod
           def link_headers
             UI.message '- Linking headers' do
               pod_targets.each do |pod_target|
-                pod_target.file_accessors.each do |file_accessor|
-                  # When integrating Pod as frameworks, built Pods are built into
-                  # frameworks, whose headers are included inside the built
-                  # framework. Those headers do not need to be linked from the
-                  # sandbox.
-                  next if pod_target.requires_frameworks? || !pod_target.should_build?
-
-                  headers_sandbox = Pathname.new(file_accessor.spec.root.name)
+                # When integrating Pod as frameworks, built Pods are built into
+                # frameworks, whose headers are included inside the built
+                # framework. Those headers do not need to be linked from the
+                # sandbox.
+                next if pod_target.requires_frameworks? && pod_target.should_build?
 
-                  pod_target.build_headers.add_search_path(headers_sandbox, pod_target.platform)
-                  sandbox.public_headers.add_search_path(headers_sandbox, pod_target.platform)
+                headers_sandbox = Pathname.new(pod_target.pod_name)
+                added_build_headers = false
+                added_public_headers = false
 
+                pod_target.file_accessors.each do |file_accessor|
                   # Private headers will always end up in Pods/Headers/Private/PodA/*.h
                   # This will allow for `""` imports to work.
                   header_mappings(headers_sandbox, file_accessor, file_accessor.headers).each do |namespaced_path, files|
+                    added_build_headers = true
                     pod_target.build_headers.add_files(namespaced_path, files)
                   end
 
                   # Public headers on the other hand will be added in Pods/Headers/Public/PodA/PodA/*.h
                   # The extra folder is intentional in order for `<>` imports to work.
                   header_mappings(headers_sandbox, file_accessor, file_accessor.public_headers, :public).each do |namespaced_path, files|
+                    added_public_headers = true
                     sandbox.public_headers.add_files(namespaced_path, files)
                   end
 
@@ -165,6 +166,9 @@ module Pod
                     end
                   end
                 end
+
+                pod_target.build_headers.add_search_path(headers_sandbox, pod_target.platform) if added_build_headers
+                sandbox.public_headers.add_search_path(headers_sandbox, pod_target.platform) if added_public_headers
               end
             end
           end

cocoapods-integration-specs @ f7fe19af

-Subproject commit 21bf4969be6345e4761a3cca3e91e8a3b953a302
+Subproject commit f7fe19aff17a09075bdba1afcde1d4ffb5fff8ab

spec/unit/installer/xcode/pods_project_generator/file_references_installer_spec.rb

@@ -99,7 +99,7 @@ module Pod
               )
             end
 
-            it 'does not link the public headers meant for the user for a vendored framework' do
+            it 'links the public headers meant for the user for a vendored framework' do
               Target.any_instance.stubs(:requires_frameworks?).returns(true)
               pod_target_one = fixture_pod_target('banana-lib/BananaLib.podspec')
               pod_target_two = fixture_pod_target('monkey/monkey.podspec')
@@ -112,7 +112,12 @@ module Pod
               banana_headers = [headers_root + 'BananaLib/Banana.h', headers_root + 'BananaLib/MoreBanana.h']
               banana_headers.each { |banana_header| banana_header.should.not.exist }
               monkey_header = headers_root + 'monkey/monkey/monkey.h'
-              monkey_header.should.not.exist
+              monkey_header.should.exist # since it lives outside of the vendored framework
+
+              config.sandbox.public_headers.search_paths(pod_target_one.platform).should == %w(
+                ${PODS_ROOT}/Headers/Public/monkey
+                ${PODS_ROOT}/Headers/Public/monkey/monkey
+              )
             end
 
             it "doesn't link public headers from vendored framework, when frameworks required" do