ENH: add optional include and only allow one file per INCLUDE

1 files changed, 15 insertions, 7 deletions

diff --git a/Source/cmIncludeCommand.cxx b/Source/cmIncludeCommand.cxx
index bfbcb05..1b440de 100644
--- a/Source/cmIncludeCommand.cxx
+++ b/Source/cmIncludeCommand.cxx
@@ -20,18 +20,26 @@
 // cmIncludeCommand
 bool cmIncludeCommand::InitialPass(std::vector<std::string>& args)
 {
-  if (args.size()< 1)
+  if (args.size()< 1 || args.size() > 2)
     {
-      this->SetError("called with wrong number of arguments.");
+      this->SetError("called with wrong number of arguments.  "
+                     "Include only takes one file.");
     }
 
-  for( unsigned int i=0; i< args.size(); i++)
+  m_Makefile->ExpandVariablesInString( args[0]);
+  bool exists = cmSystemTools::FileExists(args[0].c_str());
+  if(args.size() == 2 && args[1] == "OPTIONAL" && !exists)
     {
-      m_Makefile->ExpandVariablesInString( args[i]);
-      m_Makefile->ReadListFile( m_Makefile->GetCurrentListFile(), 
-				args[i].c_str());
+    return true;
     }
-
+  if(!exists)
+    {
+    std::string error = "Include file not found: " + args[0];
+    this->SetError(error.c_str());
+    return false;
+    }
+  m_Makefile->ReadListFile( m_Makefile->GetCurrentListFile(), 
+                            args[0].c_str());
   return true;
 }