15 files changed, 196 insertions, 11 deletions
diff --git a/Source/cmAbstractFilesCommand.cxx b/Source/cmAbstractFilesCommand.cxx
index 74c02f372c..9941e14d2f 100644
--- a/Source/cmAbstractFilesCommand.cxx
+++ b/Source/cmAbstractFilesCommand.cxx
@@ -40,10 +40,14 @@ bool cmAbstractFilesCommand::InitialPass(std::vector<std::string> const& argsIn)
       }
     else
       {
-      m += *j;
-      m += "\n";
-      ret = false;
-      } 
+      // for VTK 4.0 we have to support missing abstract sources
+      if(m_Makefile->GetDefinition("CMAKE_MINIMUM_REQUIRED_VERSION"))
+        {
+        m += *j;
+        m += "\n";
+        ret = false;
+        } 
+      }
     }
   if(!ret)
     {
diff --git a/Source/cmAddCustomCommandCommand.cxx b/Source/cmAddCustomCommandCommand.cxx
index f601ecc05c..b949438b31 100644
--- a/Source/cmAddCustomCommandCommand.cxx
+++ b/Source/cmAddCustomCommandCommand.cxx
@@ -18,19 +18,17 @@
 
 
 // cmAddCustomCommandCommand
-bool cmAddCustomCommandCommand::InitialPass(std::vector<std::string> const& argsIn)
+bool cmAddCustomCommandCommand::InitialPass(std::vector<std::string> const& args)
 {
   /* Let's complain at the end of this function about the lack of a particular
      arg. For the moment, let's say that COMMAND, TARGET are always 
      required.
   */
-  if (argsIn.size() < 4)
+  if (args.size() < 4)
     {
       this->SetError("called with wrong number of arguments.");
       return false;
     }
-  std::vector<std::string> args;
-  cmSystemTools::ExpandListArguments(argsIn, args);
 
   std::string source, command, target;
   std::vector<std::string> command_args, depends, outputs;
diff --git a/Source/cmCMakeMinimumRequired.cxx b/Source/cmCMakeMinimumRequired.cxx
new file mode 100644
index 0000000000..6be31de0d7
--- /dev/null
+++ b/Source/cmCMakeMinimumRequired.cxx
@@ -0,0 +1,45 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Insight Consortium. All rights reserved.
+  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmCMakeMinimumRequired.h"
+
+// cmCMakeMinimumRequired
+bool cmCMakeMinimumRequired::InitialPass(std::vector<std::string> const& args)
+{
+  if(args.size() != 2)
+    {
+    this->SetError("called with incorrect number of arguments");
+    return false;
+    }
+  if(args[0] == "VERSION")
+    {
+    m_Makefile->AddDefinition("CMAKE_MINIMUM_REQUIRED_VERSION", args[1].c_str());
+    }
+  float version = float(m_Makefile->GetMajorVersion());
+  version += (float(m_Makefile->GetMinorVersion()) * .1);
+  float reqVersion = 0;
+  sscanf(args[1].c_str(), "%f", &reqVersion);
+  if(reqVersion > version)
+    {
+    std::strstream str;
+    str << "WARNING: This project requires version: " << args[1].c_str() << " of cmake.\n"
+        << "You are running version: " << version << std::ends;
+    cmSystemTools::Message(str.str());
+    delete [] str.str();
+    }
+  return true;
+}
+
diff --git a/Source/cmCMakeMinimumRequired.h b/Source/cmCMakeMinimumRequired.h
new file mode 100644
index 0000000000..677a4a0777
--- /dev/null
+++ b/Source/cmCMakeMinimumRequired.h
@@ -0,0 +1,79 @@
+/*=========================================================================
+
+  Program:   Insight Segmentation & Registration Toolkit
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Insight Consortium. All rights reserved.
+  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef cmCMakeMinimumRequired_h
+#define cmCMakeMinimumRequired_h
+
+#include "cmStandardIncludes.h"
+#include "cmCommand.h"
+
+/** \class cmCMakeMinimumRequired
+ * \brief Build a CMAKE variable
+ *
+ * cmCMakeMinimumRequired sets a variable to a value with expansion.  
+ */
+class cmCMakeMinimumRequired : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmCMakeMinimumRequired;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args);
+
+  /**
+   * This determines if the command gets propagated down
+   * to makefiles located in subdirectories.
+   */
+  virtual bool IsInherited() {return true;}
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() {return "CMAKE_MINIMUM_REQUIRED";}
+  
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "Determine the command line that will build this project.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "CMAKE_MINIMUM_REQUIRED(NAME MAKECOMMAND)\n"
+      "Within CMAKE set NAME to the command that will build this project from the command line using MAKECOMMAND.";
+    }
+  
+  cmTypeMacro(cmCMakeMinimumRequired, cmCommand);
+};
+
+
+
+#endif
diff --git a/Source/cmCommands.cxx b/Source/cmCommands.cxx
index 7bc2080067..0b768b0a92 100644
--- a/Source/cmCommands.cxx
+++ b/Source/cmCommands.cxx
@@ -29,6 +29,7 @@
 #include "cmAuxSourceDirectoryCommand.cxx"
 #include "cmBuildCommand.cxx"
 #include "cmBuildNameCommand.cxx"
+#include "cmCMakeMinimumRequired.cxx"
 #include "cmConfigureFileCommand.cxx"
 #include "cmCreateTestSourceList.cxx"
 #include "cmElseCommand.cxx"
@@ -94,6 +95,7 @@ void GetPredefinedCommands(std::list<cmCommand*>& commands)
   commands.push_back(new cmAuxSourceDirectoryCommand);
   commands.push_back(new cmBuildCommand);
   commands.push_back(new cmBuildNameCommand);
+  commands.push_back(new cmCMakeMinimumRequired);
   commands.push_back(new cmConfigureFileCommand);
   commands.push_back(new cmCreateTestSourceList);
   commands.push_back(new cmElseCommand);
diff --git a/Source/cmOptionCommand.cxx b/Source/cmOptionCommand.cxx
index 2a943b85d7..4478a21fd8 100644
--- a/Source/cmOptionCommand.cxx
+++ b/Source/cmOptionCommand.cxx
@@ -19,12 +19,33 @@
 // cmOptionCommand
 bool cmOptionCommand::InitialPass(std::vector<std::string> const& args)
 {
-  if(args.size() < 2 || args.size() > 3)
+  bool argError = false;
+  if(args.size() < 2)
     {
-    this->SetError("called with incorrect number of arguments");
+    argError = true;
+    }
+  // for VTK 4.0 we have to support the option command with more than 3 arguments
+  // if CMAKE_MINIMUM_REQUIRED_VERSION is not defined, if CMAKE_MINIMUM_REQUIRED_VERSION
+  // is defined, then we can have stricter checking.
+  if(m_Makefile->GetDefinition("CMAKE_MINIMUM_REQUIRED_VERSION"))
+    {
+    if(args.size() > 3)
+      {
+      argError = true;
+      }
+    }
+  if(argError)
+    {
+    std::string m = "called with incorrect number of arguments: ";
+    for(int i =0; i < args.size(); ++i)
+      {
+      m += args[i];
+      m += " ";
+      }
+    this->SetError(m.c_str());
     return false;
     }
-
+  
   // Now check and see if the value has been stored in the cache
   // already, if so use that value and don't look for the program
   const char* cacheValue
diff --git a/Tests/Complex/CMakeLists.txt b/Tests/Complex/CMakeLists.txt
index 720ae1aec6..c2448a45c2 100644
--- a/Tests/Complex/CMakeLists.txt
+++ b/Tests/Complex/CMakeLists.txt
@@ -3,6 +3,9 @@
 #
 PROJECT (Complex)
 
+CMAKE_MINIMUM_REQUIRED(VERSION 1.3)
+
+  
 #
 # Use the ansi CXX compile flag for building cmake
 #
diff --git a/Tests/Complex/Executable/complex.cxx b/Tests/Complex/Executable/complex.cxx
index af49dcdbf3..7d86179dd3 100644
--- a/Tests/Complex/Executable/complex.cxx
+++ b/Tests/Complex/Executable/complex.cxx
@@ -647,6 +647,14 @@ int main()
 #endif
 #endif // defined(_WIN32) && !defined(__CYGWIN__)
 
+  if(strcmp(CMAKE_MINIMUM_REQUIRED_VERSION, "1.3") == 0)
+    {
+    cmPassed("CMAKE_MINIMUM_REQUIRED_VERSION is set to 1.3");
+    }
+  else
+    {
+    cmFailed("CMAKE_MINIMUM_REQUIRED_VERSION is not set to the expected 1.3");
+    }
   // ----------------------------------------------------------------------
   // Summary
 
diff --git a/Tests/Complex/cmTestConfigure.h.in b/Tests/Complex/cmTestConfigure.h.in
index 5edff154d0..58a3f60d9a 100644
--- a/Tests/Complex/cmTestConfigure.h.in
+++ b/Tests/Complex/cmTestConfigure.h.in
@@ -54,3 +54,4 @@
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #define REGISTRY_TEST_PATH "${REGISTRY_TEST_PATH}"
 #endif
+#define CMAKE_MINIMUM_REQUIRED_VERSION "${CMAKE_MINIMUM_REQUIRED_VERSION}"
diff --git a/Tests/ComplexOneConfig/CMakeLists.txt b/Tests/ComplexOneConfig/CMakeLists.txt
index 720ae1aec6..c2448a45c2 100644
--- a/Tests/ComplexOneConfig/CMakeLists.txt
+++ b/Tests/ComplexOneConfig/CMakeLists.txt
@@ -3,6 +3,9 @@
 #
 PROJECT (Complex)
 
+CMAKE_MINIMUM_REQUIRED(VERSION 1.3)
+
+  
 #
 # Use the ansi CXX compile flag for building cmake
 #
diff --git a/Tests/ComplexOneConfig/Executable/complex.cxx b/Tests/ComplexOneConfig/Executable/complex.cxx
index af49dcdbf3..7d86179dd3 100644
--- a/Tests/ComplexOneConfig/Executable/complex.cxx
+++ b/Tests/ComplexOneConfig/Executable/complex.cxx
@@ -647,6 +647,14 @@ int main()
 #endif
 #endif // defined(_WIN32) && !defined(__CYGWIN__)
 
+  if(strcmp(CMAKE_MINIMUM_REQUIRED_VERSION, "1.3") == 0)
+    {
+    cmPassed("CMAKE_MINIMUM_REQUIRED_VERSION is set to 1.3");
+    }
+  else
+    {
+    cmFailed("CMAKE_MINIMUM_REQUIRED_VERSION is not set to the expected 1.3");
+    }
   // ----------------------------------------------------------------------
   // Summary
 
diff --git a/Tests/ComplexOneConfig/cmTestConfigure.h.in b/Tests/ComplexOneConfig/cmTestConfigure.h.in
index 5edff154d0..58a3f60d9a 100644
--- a/Tests/ComplexOneConfig/cmTestConfigure.h.in
+++ b/Tests/ComplexOneConfig/cmTestConfigure.h.in
@@ -54,3 +54,4 @@
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #define REGISTRY_TEST_PATH "${REGISTRY_TEST_PATH}"
 #endif
+#define CMAKE_MINIMUM_REQUIRED_VERSION "${CMAKE_MINIMUM_REQUIRED_VERSION}"
diff --git a/Tests/ComplexRelativePaths/CMakeLists.txt b/Tests/ComplexRelativePaths/CMakeLists.txt
index 720ae1aec6..c2448a45c2 100644
--- a/Tests/ComplexRelativePaths/CMakeLists.txt
+++ b/Tests/ComplexRelativePaths/CMakeLists.txt
@@ -3,6 +3,9 @@
 #
 PROJECT (Complex)
 
+CMAKE_MINIMUM_REQUIRED(VERSION 1.3)
+
+  
 #
 # Use the ansi CXX compile flag for building cmake
 #
diff --git a/Tests/ComplexRelativePaths/Executable/complex.cxx b/Tests/ComplexRelativePaths/Executable/complex.cxx
index af49dcdbf3..7d86179dd3 100644
--- a/Tests/ComplexRelativePaths/Executable/complex.cxx
+++ b/Tests/ComplexRelativePaths/Executable/complex.cxx
@@ -647,6 +647,14 @@ int main()
 #endif
 #endif // defined(_WIN32) && !defined(__CYGWIN__)
 
+  if(strcmp(CMAKE_MINIMUM_REQUIRED_VERSION, "1.3") == 0)
+    {
+    cmPassed("CMAKE_MINIMUM_REQUIRED_VERSION is set to 1.3");
+    }
+  else
+    {
+    cmFailed("CMAKE_MINIMUM_REQUIRED_VERSION is not set to the expected 1.3");
+    }
   // ----------------------------------------------------------------------
   // Summary
 
diff --git a/Tests/ComplexRelativePaths/cmTestConfigure.h.in b/Tests/ComplexRelativePaths/cmTestConfigure.h.in
index 5edff154d0..58a3f60d9a 100644
--- a/Tests/ComplexRelativePaths/cmTestConfigure.h.in
+++ b/Tests/ComplexRelativePaths/cmTestConfigure.h.in
@@ -54,3 +54,4 @@
 #if defined(_WIN32) && !defined(__CYGWIN__)
 #define REGISTRY_TEST_PATH "${REGISTRY_TEST_PATH}"
 #endif
+#define CMAKE_MINIMUM_REQUIRED_VERSION "${CMAKE_MINIMUM_REQUIRED_VERSION}"