iOS: Fix framework resource directory layout (#15848)

A typical iOS application bundle (also Framework Bundle) contains the
application executable and any resources used by the application (for
instance, the application icon, other images, and localized content) in
the top-level bundle directory.  The same rule applies to Framework
Bundles.

Help/prop_tgt/MACOSX_BUNDLE.rst

@@ -3,7 +3,7 @@ MACOSX_BUNDLE
 
 Build an executable as an Application Bundle on OS X or iOS.
 
-When this property is set to true the executable when built on OS X
+When this property is set to ``TRUE`` the executable when built on OS X
 or iOS will be created as an application bundle.  This makes it
 a GUI executable that can be launched from the Finder.  See the
 :prop_tgt:`MACOSX_FRAMEWORK_INFO_PLIST` target property for information about

Help/prop_tgt/MACOSX_RPATH.rst

@@ -3,8 +3,8 @@ MACOSX_RPATH
 
 Whether this target on OS X or iOS is located at runtime using rpaths.
 
-When this property is set to true, the directory portion of
-the "install_name" field of this shared library will be ``@rpath``
+When this property is set to ``TRUE``, the directory portion of
+the ``install_name`` field of this shared library will be ``@rpath``
 unless overridden by :prop_tgt:`INSTALL_NAME_DIR`.  This indicates
 the shared library is to be found at runtime using runtime
 paths (rpaths).
@@ -18,6 +18,6 @@ can be controlled by the :prop_tgt:`INSTALL_RPATH` target property on
 the target linking to this target.
 
 Policy :policy:`CMP0042` was introduced to change the default value of
-``MACOSX_RPATH`` to ``TRUE.  This is because use of ``@rpath`` is a
+``MACOSX_RPATH`` to ``TRUE``.  This is because use of ``@rpath`` is a
 more flexible and powerful alternative to ``@executable_path`` and
 ``@loader_path``.

Help/prop_tgt/RESOURCE.rst

@@ -1,11 +1,61 @@
 RESOURCE
 --------
 
-Specify resource files in a :prop_tgt:`FRAMEWORK` shared library target.
-
-Shared library targets marked with the :prop_tgt:`FRAMEWORK` property generate
-frameworks on OS X, iOS and normal shared libraries on other platforms.
-This property may be set to a list of files to be placed in the
-``Resources`` directory inside the framework folder.  On non-Apple
-platforms these files may be installed using the ``RESOURCE`` option to
-the ``install(TARGETS)`` command.
+Specify resource files in a :prop_tgt:`FRAMEWORK` or :prop_tgt:`BUNDLE`.
+
+Target marked with the :prop_tgt:`FRAMEWORK` or :prop_tgt:`BUNDLE` property
+generate framework or application bundle (both OS X and iOS is supported)
+or normal shared libraries on other platforms.
+This property may be set to a list of files to be placed in the corresponding
+directory (eg. ``Resources`` directory for OS X) inside the bundle.
+On non-Apple platforms these files may be installed using the ``RESOURCE``
+option to the ``install(TARGETS)`` command.
+
+Following example of Application Bundle:
+
+.. code-block:: cmake
+
+  add_executable(ExecutableTarget
+    addDemo.c
+    resourcefile.txt
+    appresourcedir/appres.txt
+  )
+
+  target_link_libraries(ExecutableTarget heymath mul)
+
+  set(RESOURCE_FILES
+    resourcefile.txt
+    appresourcedir/appres.txt
+  )
+
+  set_target_properties(ExecutableTarget PROPERTIES
+    MACOSX_BUNDLE TRUE
+    MACOSX_FRAMEWORK_IDENTIFIER org.cmake.ExecutableTarget
+    RESOURCE "${RESOURCE_FILES}"
+  )
+
+will produce flat structure for iOS systems::
+
+  ExecutableTarget.app
+    appres.txt
+    ExecutableTarget
+    Info.plist
+    resourcefile.txt
+
+For OS X systems it will produce following directory structure::
+
+  ExecutableTarget.app/
+    Contents
+      Info.plist
+      MacOS
+        ExecutableTarget
+      Resources
+        appres.txt
+        resourcefile.txt
+
+For Linux, such cmake script produce following files::
+
+  ExecutableTarget
+  Resources
+    appres.txt
+    resourcefile.txt

Source/cmGeneratorTarget.cxx

@@ -3752,7 +3752,11 @@ void cmGeneratorTarget::ConstructSourceFileFlags() const
       if(cmSourceFile* sf = this->Makefile->GetSource(*it))
         {
         SourceFileFlags& flags = this->SourceFlagsMap[sf];
-        flags.MacFolder = "Resources";
+        flags.MacFolder = "";
+        if(!this->Makefile->PlatformIsAppleIos())
+          {
+          flags.MacFolder = "Resources";
+          }
         flags.Type = cmGeneratorTarget::SourceFileTypeResource;
         }
       }

Tests/RunCMake/Framework/FrameworkLayout.cmake

@@ -1,5 +1,11 @@
 cmake_minimum_required(VERSION 3.4)
 enable_language(C)
 
-add_library(Framework SHARED foo.c)
-set_target_properties(Framework PROPERTIES FRAMEWORK TRUE)
+add_library(Framework SHARED
+            foo.c
+            foo.h
+            res.txt)
+set_target_properties(Framework PROPERTIES
+                      FRAMEWORK TRUE
+                      PUBLIC_HEADER foo.h
+                      RESOURCE "res.txt")

Tests/RunCMake/Framework/OSXFrameworkLayout-build-check.cmake

@@ -1,7 +1,10 @@
 set(framework-dir "${RunCMake_TEST_BINARY_DIR}/Framework.framework")
-set(plist-file "${framework-dir}/Resources/Info.plist")
+set(framework-resources "${framework-dir}/Resources")
+set(framework-resource-file "${framework-resources}/res.txt")
 set(framework-library "${framework-dir}/Framework")
 set(framework-versions "${framework-dir}/Versions")
+set(plist-file "${framework-resources}/Info.plist")
+set(framework-header "${framework-dir}/Headers/foo.h")
 
 if(NOT IS_DIRECTORY ${framework-dir})
   message(SEND_ERROR "Framework not found at ${framework-dir}")
@@ -15,6 +18,18 @@ if(NOT EXISTS ${framework-library})
   message(SEND_ERROR "Framework library not found at ${framework-library}")
 endif()
 
+if(NOT EXISTS ${framework-resource-file})
+  message(SEND_ERROR "Framework resource file not found at ${framework-resource-file}")
+endif()
+
 if(NOT EXISTS ${framework-versions})
   message(SEND_ERROR "Framework versions not found at ${framework-versions}")
 endif()
+
+if(NOT EXISTS ${framework-resources})
+  message(SEND_ERROR "Framework Resources not found at ${framework-resources}")
+endif()
+
+if(NOT EXISTS ${framework-header})
+  message(SEND_ERROR "Framework header file not found at ${framework-header}")
+endif()

Tests/RunCMake/Framework/foo.h

@@ -0,0 +1 @@
+int foo();

Tests/RunCMake/Framework/iOSFrameworkLayout-build-check.cmake

@@ -1,7 +1,10 @@
 set(framework-dir "${RunCMake_TEST_BINARY_DIR}/Framework.framework")
-set(plist-file "${framework-dir}/Info.plist")
+set(framework-resources "${framework-dir}/Resources")
+set(framework-resource-file "${framework-dir}/res.txt")
 set(framework-library "${framework-dir}/Framework")
 set(framework-versions "${framework-dir}/Versions")
+set(plist-file "${framework-dir}/Info.plist")
+set(framework-header "${framework-dir}/Headers/foo.h")
 
 if(NOT IS_DIRECTORY ${framework-dir})
   message(SEND_ERROR "Framework not found at ${framework-dir}")
@@ -15,6 +18,18 @@ if(NOT EXISTS ${framework-library})
   message(SEND_ERROR "Framework library not found at ${framework-library}")
 endif()
 
+if(NOT EXISTS ${framework-resource-file})
+  message(SEND_ERROR "Framework resource file not found at ${framework-resource-file}")
+endif()
+
 if(EXISTS ${framework-versions})
   message(SEND_ERROR "Framework versions found at ${framework-versions}")
 endif()
+
+if(EXISTS ${framework-resources})
+  message(SEND_ERROR "Framework Resources found at ${framework-resources}")
+endif()
+
+if(NOT EXISTS ${framework-header})
+  message(SEND_ERROR "Framework headers not found at ${framework-header}")
+endif()