Fix OLD behavior of CMP0021.

Exclude Ninja and Xcode from the CMP0021 test

They do not behave the same as the makefile generator with
relative paths.

Don't overwrite the header file for in-source builds.

1 files changed, 4 insertions, 1 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 13cd006..ddb4e85 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -3303,7 +3303,10 @@ static void processIncludeDirectories(cmTarget *tgt,
         if (!noMessage)
           {
           tgt->GetMakefile()->IssueMessage(messageType, e.str().c_str());
-          return;
+          if (messageType == cmake::FATAL_ERROR)
+            {
+            return;
+            }
           }
         }