Xcode: Control schema generation via variable

Issue: #15441

Help/manual/cmake-properties.7.rst

@@ -46,7 +46,6 @@ Properties of Global Scope
    /prop_gbl/TARGET_SUPPORTS_SHARED_LIBS
    /prop_gbl/USE_FOLDERS
    /prop_gbl/XCODE_EMIT_EFFECTIVE_PLATFORM_NAME
-   /prop_gbl/XCODE_GENERATE_SCHEME
 
 .. _`Directory Properties`:
 

Help/manual/cmake-variables.7.rst

@@ -86,6 +86,7 @@ Variables that Provide Information
    /variable/CMAKE_VS_PLATFORM_TOOLSET
    /variable/CMAKE_VS_PLATFORM_TOOLSET_HOST_ARCHITECTURE
    /variable/CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION
+   /variable/CMAKE_XCODE_GENERATE_SCHEME
    /variable/CMAKE_XCODE_PLATFORM_TOOLSET
    /variable/PROJECT-NAME_BINARY_DIR
    /variable/PROJECT-NAME_SOURCE_DIR

Help/release/dev/cmake-xcode-schemes.rst

@@ -3,4 +3,4 @@ cmake-xcode-schemes
 
 * The :generator:`Xcode` generator got the ability to create schema files.
   This is still an experimental feature and can be activated by setting the
-  :prop_gbl:`XCODE_GENERATE_SCHEME` global property to a ``TRUE`` value.
+  :variable:`CMAKE_XCODE_GENERATE_SCHEME` variable to a ``TRUE`` value.

Help/variable/CMAKE_XCODE_GENERATE_SCHEME.rst

@@ -1,5 +1,5 @@
-XCODE_GENERATE_SCHEME
----------------------
+CMAKE_XCODE_GENERATE_SCHEME
+---------------------------
 
 If enabled, the Xcode generator will generate schema files. Those are
 are useful to invoke analyze, archive, build-for-testing and test

Source/cmGlobalXCodeGenerator.cxx

@@ -3341,8 +3341,7 @@ void cmGlobalXCodeGenerator::OutputXCodeProject(
 
   // Since the lowest available Xcode version for testing was 7.0,
   // I'm setting this as a limit then
-  if (this->GetCMakeInstance()->GetState()->GetGlobalPropertyAsBool(
-        "XCODE_GENERATE_SCHEME") &&
+  if (root->GetMakefile()->IsOn("CMAKE_XCODE_GENERATE_SCHEME") &&
       this->XcodeVersion >= 70) {
     this->OutputXCodeSharedSchemes(xcodeDir);
     this->OutputXCodeWorkspaceSettings(xcodeDir);