GENERATED prop: Add implementation for policy CMP0118 being set to NEW

* Adding implementation for policy CMP0118 being set to `NEW`.
* Adding new tests for policy CMP0118 being set to `NEW`.
* Checking the `GENERATED` property with `get_source_file_property` or
  `get_property` now always returns exactly `1` or `0`. No other values
  will be returned. Note, that this is a backwards-incompatible change,
  even when policy CMP0118 is unset or set to `OLD`.
* Additionally, as `get_source_file_property` and `get_property` now
  always check if a source-file was marked globally visible, even when
  CMP0118 is unset or set to `OLD`, they possibly return `1` where they
  might have returned `0` before the changes introduced by this commit.
  Note, that this is a backwards-incompatible change, even when policy
  CMP0118 is unset or set to `OLD`.
* As a consequence, the tests for policy CMP0118 being unset or set to
  `OLD` got slightly adjusted, too, to reflect these changes in
  behavior.

1 files changed, 11 insertions, 0 deletions

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 52f1d52..80b3775 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1814,6 +1814,7 @@ void cmGlobalGenerator::ClearGeneratorMembers()
   this->RuleHashes.clear();
   this->DirectoryContentMap.clear();
   this->BinaryDirectories.clear();
+  this->GeneratedFiles.clear();
 }
 
 void cmGlobalGenerator::ComputeTargetObjectDirectory(
@@ -2139,6 +2140,16 @@ void cmGlobalGenerator::AddInstallComponent(const std::string& component)
   }
 }
 
+void cmGlobalGenerator::MarkAsGeneratedFile(const std::string& filepath)
+{
+  this->GeneratedFiles.insert(filepath);
+}
+
+bool cmGlobalGenerator::IsGeneratedFile(const std::string& filepath)
+{
+  return this->GeneratedFiles.find(filepath) != this->GeneratedFiles.end();
+}
+
 void cmGlobalGenerator::EnableInstallTarget()
 {
   this->InstallTargetEnabled = true;