Hack a bit more on the iOS app build mechanism

There was quite come confusion as to where Xcode wants the Run Script
phase (= our gbuild mechanism) to put the executable. I think I got it
right now. Xcode can be quite scary as soon as you do anything out of
the ordinary. (But then, what isn't.)

Change-Id: I22bbdfaef88174815bff66d6c7241f4ba2360246

ios/CustomTarget_Viewer_app.mk

@@ -28,9 +28,11 @@ endif
 
 # If run from Xcode, check that its configuration (device or
 # simulator) matches that of gbuild. We detect being run from Xcode by
-# looking for $(XCODE_VERSION_ACTUAL)
+# looking for $(SCRIPT_OUTPUT_FILE_0). The Run Script build phase in
+# our project has as its (single) output file the location of the app
+# executable in its app bundle.
 
-ifneq ($(XCODE_VERSION_ACTUAL),)
+ifneq ($(SCRIPT_OUTPUT_FILE_0),)
 
 export CCACHE_CPP2=y
 
@@ -44,16 +46,25 @@ endif
 
 endif
 
-APP := Viewer
+ifneq ($(SCRIPT_OUTPUT_FILE_0),)
+# When run from Xcode, we move the Viewer executable from solver into
+# the Viewer.app directory that Xcode uses.
+$(call gb_CustomTarget_get_target,ios/Viewer_app) : $(SCRIPT_OUTPUT_FILE_0)
 
-ios_Viewer_app_DIR := $(SRC_ROOT)/ios/experimental/Viewer/DerivedData/$(APP)/Build/Products/$(xcode_config)-$(xcode_sdk)/$(APP).app
+$(SCRIPT_OUTPUT_FILE_0) : $(call gb_Executable_get_target,Viewer)
+	$(call gb_Output_announce,$@,fii,APP,2)
+	mkdir -p `dirname $(SCRIPT_OUTPUT_FILE_0)`
+	mv $(call gb_Executable_get_target,Viewer) $(SCRIPT_OUTPUT_FILE_0)
 
-ios_Viewer_app_EXE := $(ios_Viewer_app_DIR)/Viewer
+else
+# When run just from the command line, we don't have any app bundle to
+# copy or move the executable to. So do nothing.
+$(call gb_CustomTarget_get_target,ios/Viewer_app) : $(call gb_Executable_get_target,Viewer)
 
-$(call gb_CustomTarget_get_target,ios/Viewer_app) : $(ios_Viewer_app_EXE)
+$(call gb_CustomTarget_get_clean_target,ios/Viewer_app) :
+# Here we just assume that Xcode's settings are default, or something
+	rm -rf experimental/Viewer/build
 
-$(ios_Viewer_app_EXE): $(call gb_Executable_get_target,Viewer)
-	mkdir -p $(ios_Viewer_app_DIR)
-	cp $(call gb_Executable_get_target,Viewer) $(ios_Viewer_app_DIR)
+endif
 
 # vim: set noet sw=4 ts=4:

ios/experimental/Viewer/.gitignore

 .DS_Store
-DerivedData
+build
 Viewer.xcodeproj/project.xcworkspace
 Viewer.xcodeproj/xcuserdata

ios/experimental/Viewer/Viewer.xcodeproj/project.pbxproj

@@ -187,11 +187,11 @@
 			inputPaths = (
 			);
 			outputPaths = (
-				"$(DERIVED_FILE_DIR)/Viewer.app",
+				"$(CONFIGURATION_BUILD_DIR)/$(EXECUTABLE_PATH)",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "cd ../.. && /opt/lo/bin/make";
+			shellScript = "cd ../.. && /opt/lo/bin/make -r";
 		};
 /* End PBXShellScriptBuildPhase section */