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, 5 insertions, 0 deletions

diff --git a/Source/cmCPluginAPI.cxx b/Source/cmCPluginAPI.cxx
index 968fa54..9e3582c 100644
--- a/Source/cmCPluginAPI.cxx
+++ b/Source/cmCPluginAPI.cxx
@@ -550,6 +550,11 @@ void* CCONV cmAddSource(void* arg, void* arg2)
   // Create the real cmSourceFile instance and copy over saved information.
   cmSourceFile* rsf = mf->GetOrCreateSource(osf->FullPath);
   rsf->SetProperties(osf->Properties);
+  // In case the properties contain the GENERATED property,
+  // mark the real cmSourceFile as generated.
+  if (rsf->GetIsGenerated()) {
+    rsf->MarkAsGenerated();
+  }
   for (std::string const& d : osf->Depends) {
     rsf->AddDepend(d);
   }