1 files changed, 139 insertions, 0 deletions
diff --git a/Source/cmCMakeMinimumRequired.cxx b/Source/cmCMakeMinimumRequired.cxx
new file mode 100644
index 0000000..49c585f
--- /dev/null
+++ b/Source/cmCMakeMinimumRequired.cxx
@@ -0,0 +1,139 @@
+/*============================================================================
+  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 "cmCMakeMinimumRequired.h"
+
+#include "cmVersion.h"
+
+// cmCMakeMinimumRequired
+bool cmCMakeMinimumRequired
+::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
+{
+  // Process arguments.
+  std::string version_string;
+  bool doing_version = false;
+  for(unsigned int i=0; i < args.size(); ++i)
+    {
+    if(args[i] == "VERSION")
+      {
+      doing_version = true;
+      }
+    else if(args[i] == "FATAL_ERROR")
+      {
+      if(doing_version)
+        {
+        this->SetError("called with no value for VERSION.");
+        return false;
+        }
+      doing_version = false;
+      }
+    else if(doing_version)
+      {
+      doing_version = false;
+      version_string = args[i];
+      }
+    else
+      {
+      this->UnknownArguments.push_back(args[i]);
+      }
+    }
+  if(doing_version)
+    {
+    this->SetError("called with no value for VERSION.");
+    return false;
+    }
+
+  // Make sure there was a version to check.
+  if(version_string.empty())
+    {
+    return this->EnforceUnknownArguments();
+    }
+
+  // Save the required version string.
+  this->Makefile->AddDefinition("CMAKE_MINIMUM_REQUIRED_VERSION",
+                                version_string.c_str());
+
+
+  // Get the current version number.
+  int current_major = cmVersion::GetMajorVersion();
+  int current_minor = cmVersion::GetMinorVersion();
+  int current_patch = cmVersion::GetPatchVersion();
+  int current_tweak = cmVersion::GetTweakVersion();
+
+  // Parse at least two components of the version number.
+  // Use zero for those not specified.
+  int required_major = 0;
+  int required_minor = 0;
+  int required_patch = 0;
+  int required_tweak = 0;
+  if(sscanf(version_string.c_str(), "%u.%u.%u.%u",
+            &required_major, &required_minor,
+            &required_patch, &required_tweak) < 2)
+    {
+    cmOStringStream e;
+    e << "could not parse VERSION \"" << version_string.c_str() << "\".";
+    this->SetError(e.str().c_str());
+    return false;
+    }
+
+  // Compare the version numbers.
+  if((current_major < required_major) ||
+     (current_major == required_major &&
+      current_minor < required_minor) ||
+     (current_major == required_major &&
+      current_minor == required_minor &&
+      current_patch < required_patch) ||
+     (current_major == required_major &&
+      current_minor == required_minor &&
+      current_patch == required_patch &&
+      current_tweak < required_tweak))
+    {
+    // The current version is too low.
+    cmOStringStream e;
+    e << "CMake " << version_string.c_str()
+      << " or higher is required.  You are running version "
+      << cmVersion::GetCMakeVersion();
+    this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
+    cmSystemTools::SetFatalErrorOccured();
+    return true;
+    }
+
+  // The version is not from the future, so enforce unknown arguments.
+  if(!this->EnforceUnknownArguments())
+    {
+    return false;
+    }
+
+  if (required_major < 2 || (required_major == 2 && required_minor < 4))
+  {
+    this->Makefile->SetPolicyVersion("2.4");
+  }
+  else
+  {
+    this->Makefile->SetPolicyVersion(version_string.c_str());
+  }
+
+  return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmCMakeMinimumRequired::EnforceUnknownArguments()
+{
+  if(!this->UnknownArguments.empty())
+    {
+    cmOStringStream e;
+    e << "called with unknown argument \""
+      << this->UnknownArguments[0] << "\".";
+    this->SetError(e.str().c_str());
+    return false;
+    }
+  return true;
+}