Fix generating without but consuming a vendored dynamic artifact.

CHANGELOG.md

@@ -12,6 +12,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 ##### Bug Fixes
 
+* Fix generating `LD_RUNPATH_SEARCH_PATHS` without `use_frameworks!` but consuming a vendored dynamic artifact.  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#6596](https://github.com/CocoaPods/CocoaPods/issues/6596)
+
 * Fix building with static lib subprojects (previously only supported framework subprojects).  
   [Ben Asher](https://github.com/benasher44)
   [#5830](https://github.com/CocoaPods/CocoaPods/issues/5830)

lib/cocoapods/generator/xcconfig/aggregate_xcconfig.rb

@@ -80,7 +80,11 @@ module Pod
           # See https://github.com/CocoaPods/CocoaPods/issues/1216
           @xcconfig.attributes.delete('USE_HEADERMAP')
 
-          generate_ld_runpath_search_paths if target.requires_frameworks?
+          # If any of the aggregate target dependencies bring in any vendored dynamic artifacts we should ensure to
+          # update the runpath search paths.
+          vendored_dynamic_artifacts = pod_targets.flat_map(&:file_accessors).flat_map(&:vendored_dynamic_artifacts)
+
+          generate_ld_runpath_search_paths if target.requires_frameworks? || vendored_dynamic_artifacts.count > 0
 
           @xcconfig
         end

spec/unit/generator/xcconfig/aggregate_xcconfig_spec.rb

@@ -218,6 +218,11 @@ module Pod
               expected = '$(inherited)'
               @xcconfig.to_hash['HEADER_SEARCH_PATHS'].should.include expected
             end
+
+            it 'includes default runpath search path list when not using frameworks but links a vendored dynamic framework' do
+              @target.stubs(:requires_frameworks?).returns(false)
+              @generator.generate.to_hash['LD_RUNPATH_SEARCH_PATHS'].should == "$(inherited) '@executable_path/Frameworks' '@loader_path/Frameworks'"
+            end
           end
 
           describe 'with a scoped pod target' do