Drop compatibility with CMake < 2.4

Drop all behavior activated by setting CMAKE_BACKWARDS_COMPATIBILITY to
a value lower than 2.4, and generate an error when projects or the user
attempt to do so.  In the error suggest using a CMake 2.8.x release.

Teach cmake_minimum_required to warn about projects that do not require
at least CMake 2.4.  They are not supported by CMake >= 3.0.

Replace the documentation of CMAKE_BACKWARDS_COMPATIBILITY with a
reference to policy CMP0001.

1 files changed, 0 insertions, 4 deletions

diff --git a/Source/cmConfigureFileCommand.h b/Source/cmConfigureFileCommand.h
index 605b58b..86de92c 100644
--- a/Source/cmConfigureFileCommand.h
+++ b/Source/cmConfigureFileCommand.h
@@ -41,9 +41,6 @@ public:
    */
   virtual bool IsScriptable() const { return true; }
 
-  virtual void FinalPass();
-  virtual bool HasFinalPass() const { return !this->Immediate; }
-
 private:
   int ConfigureFile();
 
@@ -53,7 +50,6 @@ private:
   std::string OutputFile;
   bool CopyOnly;
   bool EscapeQuotes;
-  bool Immediate;
   bool AtOnly;
 };