Allow storing custom build for dependency

lib/cocoapods-core/podfile/target_definition.rb

@@ -326,6 +326,18 @@ def inhibits_warnings_for_pod?(pod_name)
         end
       end
 
+      #--------------------------------------#
+      # 
+      # 
+      # @param  [String] pod_name
+      #         the anem of the pod to query build type for.
+      #
+      # @return [BuildType] The resolved build type for the pod.
+      #
+      def build_type_for_pod(pod_name)
+        raw_build_types_hash[pod_name] || build_type
+      end
+
       # Sets whether the target definition should inhibit the warnings during
       # compilation for all pods.
       #
@@ -363,6 +375,20 @@ def set_inhibit_warnings_for_pod(pod_name, should_inhibit)
         raw_inhibit_warnings_hash[hash_key] << pod_name
       end
 
+      # Set a custom build type for a specific pod.
+      #
+      # @param  [String] pod_name
+      #         Name of the pod for which the build type should be set.
+      #
+      # @param  [BuildType] build_type
+      #         The build type.
+      #
+      # @return [void]
+      #
+      def set_build_type_for_pod(pod_name, build_type)
+        raw_build_types_hash[pod_name] = build_type
+      end
+
       #--------------------------------------#
 
       # The (desired) build type for the pods integrated in this target definition. Defaults to static libraries and can
@@ -710,6 +736,7 @@ def store_pod(name, *requirements)
         parse_modular_headers(name, requirements)
         parse_configuration_whitelist(name, requirements)
         parse_project_name(name, requirements)
+        parse_build_type(name, requirements)
 
         if requirements && !requirements.empty?
           pod = { name => requirements }
@@ -824,6 +851,7 @@ def store_script_phase(options)
         inheritance
         abstract
         swift_version
+        build_types_hash
       ).freeze
 
       # @return [Hash] The hash representation of the target definition.
@@ -952,6 +980,11 @@ def raw_configuration_pod_whitelist
       end
       private :raw_configuration_pod_whitelist
 
+      def raw_build_types_hash
+        get_hash_value('build_types_hash', {})
+      end
+      private :raw_build_types_hash
+
       # Returns the configuration_pod_whitelist hash
       #
       # @return [Hash<String, Array>] Hash with configuration name as key,
@@ -1065,6 +1098,32 @@ def parse_inhibit_warnings(name, requirements)
         requirements.pop if options.empty?
       end
 
+      # Removes :build from the requirements list, and adds
+      # the pod's name into internal hash for build type overrides.
+      #
+      # @param [String] name The name of the pod
+      #
+      # @param [Array] requirements
+      #        If :build is the only key in the hash, the hash
+      #        should be destroyed because it confuses Gem::Dependency.
+      #
+      # @return [void]
+      #
+      def parse_build_type(name, requirements)
+        options = requirements.last
+        return requirements unless options.is_a?(Hash)
+
+        build_type_raw = options.delete(:build)
+        return if build_type_raw.nil?
+
+        pod_name = Specification.root_name(name)
+        build_type_to_store = BuildType.new(:linkage => build_type_raw.fetch(:linkage, build_type.linkage), 
+                                            :packaging => build_type_raw.fetch(:packaging, build_type.packaging))
+        set_build_type_for_pod(pod_name, build_type_to_store)
+
+        requirements.pop if options.empty?
+      end
+
       # Removes :modular_headers from the requirements list, and adds
       # the pods name into internal hash for modular headers.
       #