Do not attempt compilation for pods with no sources and skipping import validation

CHANGELOG.md

@@ -18,7 +18,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 ##### Bug Fixes
 
-* None.  
+* Do not attempt compilation for pods with no sources and skipping import validation  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#7336](https://github.com/CocoaPods/CocoaPods/issues/7336)
 
 
 ## 1.4.0 (2018-01-18)

lib/cocoapods/validator.rb

@@ -545,21 +545,25 @@ module Pod
     # Performs platform specific analysis. It requires to download the source
     # at each iteration
     #
-    # @note   Xcode warnings are treaded as notes because the spec maintainer
+    # @note   Xcode warnings are treated as notes because the spec maintainer
     #         might not be the author of the library
     #
     # @return [void]
     #
     def build_pod
       if !xcodebuild_available?
-        UI.warn "Skipping compilation with `xcodebuild' because it can't be found.\n".yellow
+        UI.warn "Skipping compilation with `xcodebuild` because it can't be found.\n".yellow
       else
-        UI.message "\nBuilding with xcodebuild.\n".yellow do
+        UI.message "\nBuilding with `xcodebuild`.\n".yellow do
           scheme = if skip_import_validation?
-                     @installer.pod_targets.find { |pt| pt.pod_name == spec.root.name }.label
+                     pod_target = @installer.pod_targets.find { |pt| pt.pod_name == spec.root.name }
+                     pod_target.label if pod_target.should_build?
                    else
                      'App'
                    end
+          if scheme.nil?
+            UI.warn "Skipping compilation with `xcodebuild` because target contains no sources.\n".yellow
+          else
             output = xcodebuild('build', scheme, 'Release')
             UI.puts output
             parsed_output = parse_xcodebuild_output(output)
@@ -567,19 +571,20 @@ module Pod
           end
         end
       end
+    end
 
     # Builds and runs all test sources associated with the current specification being validated.
     #
-    # @note   Xcode warnings are treaded as notes because the spec maintainer
+    # @note   Xcode warnings are treated as notes because the spec maintainer
     #         might not be the author of the library
     #
     # @return [void]
     #
     def test_pod
       if !xcodebuild_available?
-        UI.warn "Skipping test validation with `xcodebuild' because it can't be found.\n".yellow
+        UI.warn "Skipping test validation with `xcodebuild` because it can't be found.\n".yellow
       else
-        UI.message "\nTesting with xcodebuild.\n".yellow do
+        UI.message "\nTesting with `xcodebuild`.\n".yellow do
           pod_target = @installer.pod_targets.find { |pt| pt.pod_name == spec.root.name }
           consumer.spec.test_specs.each do |test_spec|
             scheme = pod_target.native_target_for_spec(test_spec)

cocoapods-integration-specs @ 47f6e71c

-Subproject commit 5ec8622af1b9adb969d66b5b01bb88e016bca627
+Subproject commit 47f6e71c0f9001d2da80686e9b90870ad394e228