1 files changed, 76 insertions, 0 deletions
diff --git a/Source/cmVariableRequiresCommand.cxx b/Source/cmVariableRequiresCommand.cxx
new file mode 100644
index 000000000..0e97a832a
--- /dev/null
+++ b/Source/cmVariableRequiresCommand.cxx
@@ -0,0 +1,76 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#include "cmVariableRequiresCommand.h"
+#include "cmCacheManager.h"
+
+// cmLibraryCommand
+bool cmVariableRequiresCommand
+::InitialPass(std::vector<std::string>const& args, cmExecutionStatus &)
+{
+  if(args.size() < 3 )
+    {
+    this->SetError("called with incorrect number of arguments");
+    return false;
+    }
+
+  std::string testVariable = args[0]; 
+  if(!this->Makefile->IsOn(testVariable.c_str()))
+    {
+    return true;
+    }
+  std::string resultVariable = args[1];
+  bool requirementsMet = true;
+  std::string notSet;
+  bool hasAdvanced = false;
+  for(unsigned int i = 2; i < args.size(); ++i)
+    {
+    if(!this->Makefile->IsOn(args[i].c_str()))
+      {
+      requirementsMet = false;
+      notSet += args[i];
+      notSet += "\n";
+      cmCacheManager::CacheIterator it = 
+        this->Makefile->GetCacheManager()->GetCacheIterator(args[i].c_str());
+      if(!it.IsAtEnd() && it.GetPropertyAsBool("ADVANCED"))
+        {
+        hasAdvanced = true;
+        }
+      }
+    }
+  const char* reqVar = this->Makefile->GetDefinition(resultVariable.c_str());
+  // if reqVar is unset, then set it to requirementsMet 
+  // if reqVar is set to true, but requirementsMet is false , then
+  // set reqVar to false.
+  if(!reqVar || (!requirementsMet && this->Makefile->IsOn(reqVar)))
+    {
+    this->Makefile->AddDefinition(resultVariable.c_str(), requirementsMet);
+    }
+
+  if(!requirementsMet)
+    {
+    std::string message = "Variable assertion failed:\n";
+    message += testVariable + 
+      " Requires that the following unset variables are set:\n";
+    message += notSet;
+    message += "\nPlease set them, or set ";
+    message += testVariable + " to false, and re-configure.\n";
+    if(hasAdvanced)
+      {
+      message += 
+        "One or more of the required variables is advanced."
+        "  To set the variable, you must turn on advanced mode in cmake.";
+      }
+    cmSystemTools::Error(message.c_str());
+    }
+
+  return true;
+}